当前位置:文档之家› 练习题二

练习题二

练习题二
练习题二

练习题二

Paper One

Part I Reading Comprehension

Directions: There are several passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the centre.

Passage One

Questions 1 to 5 are based on the following passage:

Boy meets girl. They fall in love. They get married. It’s a familiar story, the plot of countless books and Hollywood movies. But how does a boy meet a girl? It all begins with dating.

Dating begins in high school. Boys and girls usually form groups with similar interests and tastes. They like the same pop music and fashion styles. They “hang out” at the same restaurants. Then one boy from the group may take a girl to see a movie, or they may go together to a fast food restaurant for a hamburger and coke. This is their first date. After the first date they may go on other dates and get to know each other more. Or things may not work out. The boy or the girl may start dating another partner. And so the ritual (仪式) goes on. As you get older dating becomes more difficult. You can meet members of the opposite sex at parties or in bars, at university or in your place of work. However, more and more people are putting a career and financial security ahead of courtship (追求)and marriage.

In today’s lonely world people also advertise for a date. Many newspapers carry columns from people looking for a life companion. You can also find a date by computer! The computer matches your character and personality with a suitable partner and puts you in contact with each other. Then you make a date. The success rate isn’t high but there have been a few happy “computer marriages”!

1. Date in the passage has ________ meanings.

A) 1

B) 2

C) 3

D) 4

2. The best explanation of “hang out” in Para. 2 is “to ________”.

A) study out in a place

B) spend a lot of time in a particular place or area

C) work out

D) sing and dance out

3. According to the passage, adults tend to attach more importance to ________.

A) common interest

B) others’ opinion

C) decent jobs and high salaries

D) intuition

4. The author thinks that ________.

A) dating in high school is usually unsuccessful

B) dating will be easier for you after you graduate from the high school

C) people have more choices at university or at work

D) adults care more about their work and money

5. In the sense of love-matching, computer is ________.

A) always unsuccessful

B) successful sometimes

C) often successful

D) of no use

Passage Two

Questions 6 to 10 are based on the following passage:

Supermarkets are trying to cheat you to spend more. For example, moving a brand from the bottom shelf to eye level can increase sales by 50 percent. It’s no surprise, then, that foods and other high-profit items are at eye level. To beat supermarkets at their own game, use coupons (优惠券), buy in quantity and shop with your eyes open.

We gave a same shopping list to two staff members, asking one to choose items regardless of cost and the other to look for low prices. Our impulsive shopper would come up with name-brand products costing $110.05. The careful shopper’s cart contained mostly store brands. She spent $59.35, a saving of $50.70.

Usually our careful shopper did not have to settle for lower quality. In the past tests, many store-brand products (tea bags, peanut butter, preserves, glass cleaner) have done as well as or better than name-brand (名牌) ones. Shopping the way our careful staffer did, you would be able to save $2,500 a year buying for a family of four.

Sometimes, brand-name items are of better quality. sometime’s they’re more convenient. Nonetheless, we promise you: if you shop with your eyes open, you’ll save mone y.

6. One trick used by supermarkets is ________.

A) putting high-profit items usually in the upper-middle place of the shelf

B) use something to attract shoppers’ attention

C) give out coupons to people

D) prohibit quantity buying

7. An “impulsive shopper” ________.

A) makes quick decision as to what to buy and what not to buy

B) often buys something that is useless or he actually doesn’t need

C) always buy those expensive things

D) always buy those cheap things

8. What can be inferred from the passage?

A) Brand-name products are too expensive.

B) Making a shopping list before going shopping is a good way to save money.

C) Store-brand products can be as good as name-brand ones.

D) Buying brand-name products is a waste of money.

9. According to the passage, in the past, some tests had been done on ________.

A) how to save money

B) how a careful shopper behaves

C) why impulsive shopper spends more money

D) the comparison between name-brand products and store-brand ones

10. “Sometimes they’re more convenient”means “________”.

A) sometimes the producers provide convenient services

B) sometimes they are easier to get from the shelf

C) sometimes they are easier to carry and use

D) sometimes they are of better quality

Passage Three

Questions 11 to 15 are based on the following passage:

The American Revolution was not a revolution in the sense of a radical change. It was not a sudden and violent overturning of the political and social framework, such as later occurred in France and Russia, when both were already independent nations. Significant changes were ushered in, but they were both breathtaking. What happened was accelerated evolution rather than outright revolution. During the conflict itself people went on working and praying, marrying and playing. Most of them were not seriously disturbed by the actual fighting, and many of the more isolated communities scarcely knew that a war was on.

America’s War of Independence heralded the birth of three modern nations. One was Canada, which received its first large influx (流入) of English-speaking population from the thousands of loyalists who fled there from the United States. Another was Australia, which became a penal colony now that America was no longer available for prisoners and debtors. The third newcomer --- the United States --- based itself squarely on republican principles.

Yet even the political overturn was not as revolutionary as one might suppose. In some states, notably Connecticut and Rhode Island, the war largely ratified a colonial self-rule already existing. British officials, everywhere ousted, were replaced by a homegrown governing class, which promptly sought a local substitute of king and parliament (国会).

11. Which would be the best title for the passage?

A) The United States: An Isolated Community

B) Breathtaking Events During the American Revolution

C) Canada and the American War of Independence

D) The American Revolution: Evolution Not Revolution

12. In the first paragraph, what does the author mean by “people went on working and praying, marrying and playing”?

A) Most people got married than divorced.

B) The war created new jobs.

C) Life went on as usual.

D) People had more than enough leisure time.

13. In the second paragraph, the author states that the colonies’ struggle for self-government preceded the creation of all of the following countries EXCEPT ________.

A) Canada

B) The United States

C) Australia

D) The United Kingdom

14. It can be inferred from the passage that the loyalists who escaped to Canada were ________.

A) Russian

B) French

C) British

D) Australian

15. What will the paragraph following the passage most probably discuss?

A) The transport of prisoners to Australia.

B) The creation of new state governments.

C) Events leading up to the American Revolution.

D) How Canada and the United States became friends.

Passage Four

Questions 16 to 20 are based on the following passage:

A recent study described coal as a “bridge to the future”. As the most plentiful fossil (化石)

fuel in the world, coal has the possibility for filling a growing proportion of the demand for energy. But problems cause some trouble to this promising old fuel.

Coal is found around the globe, but three countries (the United States, the former Soviet Union and China) own nearly two thirds of all known coal reserves. At present rates of using coal, these reserves would last the world more than 200 years, according to the estimates carefully made. Furthermore, scientists think the world probably has 15 times this much coal.

While the United States has the largest share --- more than a quarter --- of the 786 billion tons of known world coal reserves, both the former Soviet Union and China produce almost as much coal as the U. S. does.

In addition to the category of known reserves, the U.S. Geological Survey has calculated that the United States has an estimated 1.7 trillion (万亿) tons of coal at depths of less than 3,000 feet. Unfortunately, much of this coal is not easy to get with present technology or at present prices.

To produce and use much more coal than we do today, a number of problems will have to be solved: capital at high interest rates, manpower, and transportation, including insufficient rail facilities. Environmental concerns include the proper development of mine sites, possible changes in global climate caused by increased carbon dioxide from burning coal, and the objects that are sent out from coal stacks that wear out buildings, poison lakes, and damage human lungs.

16. One of the advantages of coals is that ________.

A) it can improve global climate

B) there is a lot of it

C) it is always easy to dig

D) it doesn’t pollute

17. Which problem is NOT mentioned in the article?

A) Difficulties in digging the coal.

B) Pollution of the environment.

C) What happens when the coal is used up.

D) Insufficient rail facilities.

18. Which country has the largest share of known world coal reserves?

A) China.

B) The United States.

C) The former Soviet Union.

D) The article doesn’t tell us.

19. How much coal does the United States have in known coal reserves?

A) 786 billion tons.

B) 1.7 billion tons.

C) Nearly 200 billion tons.

D) 3,000 billion tons.

20. According to the passage, which of the following statement is TRUE?

A) The U. S. has about 1.7 trillion tons of coal at depths of more than 3,000 feet.

B) Scientists think that all coal reserves have been found out.

C) All coal is easy to get because we have modern technology.

D) The U.S., the former Soviet Union and China produce almost equal amounts of coal.

Part II Vocabulary and Structure

Directions: There are a number of incomplete sentences in this part. For each sentence there are four choices marked A), B), C) and D). Choose the ONE answer that best completes the sentence. Then mark the corresponding letter on the Answer Sheet with a single line through the centre. 21. Concerted efforts of society should be taken to _________ the problem of juvenile

delinquency.

A) anticipate B) dispose C) tackle D) entreat

22. He ________ the company’s ruin by highly-risky investment.

A) put across B) brought about C) inspired D) took advantage of

23. What’s the ________ on how many bottles of wine you can bring through customs?

A) regulation B) amount C) limit D) number

24. We tried to ________ what he meant.

A) make for B) make out C) make of D) make from

25. Mark Messier is the NHL player who has ________ the biggest fortune, with his hockey

salary, over the last 12 seasons.

A) accumulated B) gathered C) assembled D) collected

26. We want to ensure that help is ________ for all children suffering abuse.

A) at hand B) by hand C) on hand D) off hand

27. Do you think this present is ________ for a little girl?

A) sufficient B) qualified C) suitable D) useful

28. Let’s put our heads together and ________ on a plan of action.

A) make B) examine C) decide D) draw

29. His knowledge of English is adequate for the job, although he is not fluent in the language.

A) proper B) complete C) perfect D) enough

30. It’s ________ making an effort.

A) useful B) use C) worth D) worthy

31. Of the ten plays which she has written, the first three were ________.

A) much the best B) better C) more good D) best

32. He suggested that the rapid growth and improvements in wine making were because the wine

makers were competing ________ each other rather than competing ________ each other.

A) with...against B) against...with C) for...with D) with...for

33. John’s leg showed no symptom of ________.

A) injuring C) having injured

B) being injured D) having been injured

34. He was taller than his father when he reached his full ________.

A) stature B) reputation C) adult D) bulk

35. The band played a familiar tone which had everyone ________ along.

A) clapping B) motioning C) stirring D) proceeding

36. Hold ________ your dream; never let it go.

A) onto B) out C) back D) in

37. We have succeeded because we had the _________ to invest in the flourishing real estate (房

地产).

A) foresight B) insight C) short sight D) front sight

have achieved.

A) compliment B) complement C) complain D) compress

39. We offered them our ________ on winning the match.

A) congratulation B) congratulations C) property D) properties

40. Linda managed to support herself by working ________ as a waitress.

A) off and on B) or something C) at the moment D) more than a little

41. ________ I try, I cannot find the answer.

A) However B) However hard C) No matter D) Even

42. She rose ________ her feet when he walked in.

A) to B) on C) at D) upon

43. You two have been growing up together ever since you were a little boy and a little girl. You

________ close friendship ever since childhood.

A) have B) must have had C) had D) must have

44. To ________, the fundamental problem of understanding intelligence is how to represent large

amounts of knowledge in a fashion that permits their effective use and interaction.

A) sum up B) look up C) add up D) set up

45. Her dress was ________ silk.

A) made up B) made of C) made from D) made in

46. It took her ten years to ________ her publishing business.

A) build up B) make up C) think up D) come up

47. We’ll need ________ milk if Bob and Mary are coming for the weekend.

A) other B) extra C) spare D) further

48. I was held up in a traffic ________.

A) crush B) jam C) crash D) block

49. Property damage due to the fire _________ to be over 5 million.

A) estimates B) is estimated C) has estimated D) having estimated

50. Is the Internet just a new ________ that allows us to communicate differently or does it bring a

message that will revolutionize the way we think, act and learn?

A) communication B) medium C) material D) media

51. They were prepared to ________ their immediate needs to the long-term goal of equal

opportunity.

A) discard B) recapture C) sacrifice D) motivate

52. She ________ herself during the winter with the thought of the warm sunny weather to come.

A) delighted B) supported C) interested D) fortified

53. She says she is very sorry and realizes she ________ it.

A) did C) shouldn’t do

B) shouldn’t have done D) had done

sea.

A) give B) handle C) establish D) witness

55. For wildlife enthusiasts the journey is ________ : the region is known for its sea birds.

A) funny B) worthy C) pleased D) worthwhile

56. ________, we’d better make some changes in the plan.

A) That is the case C) That to be the case

B) That having been the case D) That being the case

57. He could have told us what had happened, but he did not ________ to.

A) choose B) promise C) select D) allow

58. The moment they ________ the train it began to pull out of the station.

A) boarded B) got C) jumped D) took

59. The ants, ________, have their times for play.

A) hardworking as are they C) hardworking despite they are

B) as they are hardworking D) hardworking as they are

60. Scientists will have to ________ new methods of increasing the world’s food supply.

A) invent B) displeasure C) discover D) come up with

Part III Cloze

Directions: There are a number of blanks in the following passage. For each blank there are four choices marked A), B), C) and D). You should choose the ONE that best fits into the passage. Then mark the corresponding letter on the Answer Sheet with a single line through the centre.

A big battle was going on ?61?the First World War. Guns were firing, and shells and bullets were flying about ?62? . After an hour of this, one of the soldiers decided that the fighting ?63?too dangerous for him, ?64?he left the front line and began to go away from the battle. ?65?he had walked for an hour, he saw an officer ?66?towards him. The officer stopped him and said, “Where are you going?”

“I’m trying to get ?67?away as possible from the battle that’s going ?68?behind us, sir,” the soldier answered.

“Do you know ?69??” the officer said to him angrily, “I’m your commanding officer.”

The soldier was very ?70?when he heard this and said, “My God, I didn’t know that I was so far back already!”

61.A) when B) since C) during D) while

62.A) anywhere B) everywhere C) somewhere D) nowhere

63.A) got B) get C) was getting D) had got

64.A) however B) moreover C) yet D) so

65.A) Since B) After C) Until D) Unless

66.A) come B) be coming C) coming D) to come

67.A) such far B) so far C) by far D) as far

68.A) on B) up C) forward D) along

69.A) who am I B) who I am C) whom am I D) whom I am

70.A) surprise B) surprisingly C) surprised D) surprising

The air surrounding us is important ?71?everyone. Without air, we could not ?72? . Everyone understands that. But air is necessary ?73?many other ways that are not always so

?74?or widely known.

For example, if we did not have air, ?75?would be no sound. Sound travels through air. ?76?there is no air, there is no sound. ?77?air, there would be no fire. There would be no automobiles, ?78?motors need air in order to ?79? .

Without air there would be no wind or clouds. There would be no ?80? , as we know it. The night time would be very ?81? , the days very hot. We would be ?82?to seek shelter from the sun, ?83?there would be no atmosphere to protect us from the sun’s ?84?rays.

The ?85?is all the air surrounding the ?86? . Atmosphere pressure is the weight of all that air against the ?87?of the earth. If we did not have ?88?pressure, we could not have automobile tires. The tires would ?89?or burst if they did not have the pressure of the atmosphere ?90?their surface.

71.A) to B) by C) for D) in

72.A) living B) lively C) exist D) alive

73.A) under B) of C) on D) in

74.A) clearly B) obviously C) obvious D) knowingly

75.A) there B) they C) it D) we

76.A) What B) Where C) Which D) Why

77.A) Despite B) With C) As D) Without

78.A) however B) but C) since D) and

D) for operating

79.A) operate B) being operated C) having been

operated

80.A) air B) weather C) breeze D) climate

81.A) warm B) cool C) cold D) hot

82.A) forcing B) forceful C) force D) forced

83.A) as B) so C) that D) so that

84.A) dying B) dead C) deadly D) death

85.A) atmosphere B) gas C) cloud D) wind

86.A) floor B) ground C) land D) earth

87.A) top B) surface C) face D) coverage

88.A) the atmosphere B) atmosphere C) atmospheric D) atmospherics

89.A) sweet B) swell C) sweep D) smell

90.A) under B) against C) beneath D) above

Name:_____________ Class:_____________

Student No.:_____________ Score:_____________

Answer Sheet

Part I Reading Comprehension

1._____

2._____

3._____

4._____

5._____

6._____

7._____

8._____

9._____10._____

11._____12._____13._____14._____15._____

16._____17._____18._____19._____20._____

Part II Vocabulary and Structure

21._____22._____23._____24._____25._____

26._____27._____28._____29._____30._____

31._____32._____33._____34._____35._____

36._____37._____38._____39._____40._____

41._____42._____43._____44._____45._____

46._____47._____48._____49._____50._____

51._____52._____53._____54._____55._____

56._____57._____58._____59._____60._____

Part III Cloze

61._____62._____63._____64._____65._____

66._____67._____68._____69._____70._____

71._____72._____73._____74._____75._____

76._____77._____78._____79._____80._____

81._____82._____83._____84._____85._____

86._____87._____88._____89._____90._____

练习题二( 参考答案)

Key

Paper One

Part I Reading Comprehension

1.C

2.B

3.C

4.D

5.B

6.A

7.B

8.B

9.D10.B

11.D12.C13.D14.C15.B

16.B17.C18.B19.C20.D

Part II Vocabulary and Structure

21.C22.B23.C24.B25.A

26.A27.C28.C29.D30.C

31.A32.A33.D34.A35.A

36.A37.A38.A39.B40.A

41.B42.A43.B44.A45.B

46.A47.B48.B49.B50.B

51.C52.D53.B54.D55.D

56.D57.A58.A59.D60.D

Part III Cloze

61.C62.B63.C64.D65.B

66.C67.D68.A69.B70.C

71.A72.C73.D74.C75.A

76.B77.D78.C79.A80.B

81.C82.D83.A84.C85.A

86.D87.B88.C89.B90.B

第二章化学反应速率练习题与答案

第二章 化学反应速率练习题 一、填空题 1. 某反应,当升高反应温度时,反应物的转化率减小, 若只增加体系总压时,反应物的 转化率提高,则此反应为 热反应,且反应物分子数 (大于、小于)产物分子 数。 2. 对于 反应,其反应级数一定等于反应物计量系数 ,速度常数的单位由 决定,若 k 的单位为 L 2 ·mol - 2 ·S - 1 ,则对应的反应级数为 。 3. 可逆反应 A ( g) + B ( g) ? C( g) +Q 达到平衡后,再给体系加热正反应速度 , 逆反应速度 ,平衡向 方向移动。 4. 在 500K 时,反应 SO 2( g) + 1/2O 2( g) ? SO 3( g) 的 K p = 50,在同一温度下,反应 2 SO 3( g) ? 2SO 2( g) + O 2( g) 的 K p = 。 5. 反应: HIO 3 +3H 2SO 3 HI + 3H 2 SO 4,经实验证明,该反应分两步完成; (1) HIO 3+ H 2SO 3 HIO 2+ H 2SO 4(慢反应),(2) HIO 2+ 2H 2SO 3 HI + 2H 2SO 4(快反应),因此反应 的速度方程式是 。 6. 在 298K 温度下,将 1 摩尔 SO 3 放入 1 升的反应器内,当反应 2 SO 3(g)? 2SO 2( g) + O 2( g) 达到平衡时, 容器内有 0.6 摩尔的 SO 2,其 K C 是 ,K p 是 。(R = 8.314 kPa ·L · K - 1 · mol - 1 )。 7. 已知下列反应的平衡常数: H 2(g) + S(s)? H 2S(g) , K c =1.0 × 10- 3 ; S( s) + O 2( g) ? SO 2( g) , K c = 5.0 ×10 6 ; H 2(g) + SO 2(g) ? H 2S(g) + O 2(g) 的平衡常数 K c 为 。 8. 简单反应 A = B + C ,反应速度方程为 ,反应级数为 ,若分别以 A 、 B 两种物质表示该反应的反应速度,则 V A 与V B 。 9. 阿仑尼乌斯公式中 e - Ea/RT 的物理意义是 。 10. 催化剂能加快反应速度的原因是它改变了反应的 ,降低了反应的 ,从而 使活化分子百分数增加。 二、判断题 ( 正确的请在括号内打√,错误的打× ) 11. 某温度下 2N 2O 5 = 4NO 2 + O 2 该反应的速度和以各种物质表示的反应速度的关系为: V=1/2 V N 2 O 5 = 1/4 V NO 2 = V O 2 。() 12. 化学反应平衡常数 K 值越大,其反应速度越快。 ( ) 13. 因为平衡常数和反应的转化率都能表示化学反应进行的程度,所以平衡常数即是反 应的转化率。() 14. 在 2SO 2 + O 2? 2SO 3 的反应中,在一定温度和浓度的条件下,无论使用催化剂或不 使用催化剂,只要反应达到平衡时,产物的浓度总是相同的。 ( ) 15. 增加温度,使吸热反应的反应速度加快,放热反应的反应速度减慢,所以增加温度 使平衡向吸热反应方向移动。 ( ) 16. 化学平衡常数 K c 等于各分步反应平衡常数 K c1,K c2??之和。 () 17. 催化剂可影响反应速度,但不影响热效应。() 18. 化学反应平衡常数 K 值越大,其反应速度越快。 ( ) 19. 在一定温度下反应的活化能愈大,反应速度亦愈大。 ( ) 20. 催化剂将增加平衡时产物的浓度。 ( ) 21. 一个气体反应的标准自由能变 △G Θ 298,是指反应物和产物都处于 298.15 K 且混合气 体的总压力为 100kPa 时反应的自由能变。 ( ) 22. 体系由状态 1→状态 2 的过程中, 热 ( Q) 和功 ( W) 的数值随不同的途径而异。 ( )

二年级数学下册几何图形知识点练习题人教版

二年级数学下册几何图形知识点练习题人教版一、数一数,各有几个角? ______个直角,______个锐角,______个钝角。 二、比较角的大小。 ______>______>______ 三、想一想,选一选。 1.下列运动属于旋转现象的是()。 A .水车的转动 B .气球升空的运动 C .电梯的上下移动 D .温度计中液柱的上升或下降 2.下列运动属于平移现象的是()。 A .推拉抽屉 B .拧开瓶盖 C .转动的风车 D .旋转门

四、动动脑,做一做。 1.一个正方形从中间对折,可以等分成两个长方形,也可以等分成两个 ______。 2.知道长方形相邻两条边的长度,那么也______知道其他两条边的长度。 3.将一个长是5厘米,宽是3厘米的长方形,裁成一个最大的正方形,正方形的边长是多少厘米? 五、加上一条线段,使下面的图形变成我们认识的图形。 六、下面的图形各有几条对称轴: ______ ______ ______ 七、拼一拼。这样的1个直角三角形和一个长方形拼一拼,可以拼成梯形吗?画一画。

八、拼图我最行。观察这些图形我会拼。 ______ ____________ ______ ____________ ______ 九、判断正误,在正确说法后面的括号内画“√”,错误说法后面的括号内画“×”。 1.正方形剪去一个角后,还剩3个角。() 2.锐角拼在一起,拼成的有可能是钝角。() 3.所有的直角都是一样大的。() 4. 一个角有两个顶点跟一条边组成。() 十、动动脑,选一选。 1.下列说法中,正确的是()。 A .一个角的两条边变长,角也会变大。

数值分析第二章复习与思考题

第二章复习与思考题 1.什么是拉格朗日插值基函数?它们是如何构造的?有何重要性质? 答:若n 次多项式()),,1,0(n j x l j =在1+n 个节点n x x x <<< 10上满足条件 (),,,1,0,, ,0, ,1n k j j k j k x l k j =?? ?≠== 则称这1+n 个n 次多项式()()()x l x l x l n ,,,10 为节点n x x x ,,,10 上的n 次拉格朗日插值基函数. 以()x l k 为例,由()x l k 所满足的条件以及()x l k 为n 次多项式,可设 ()()()()()n k k k x x x x x x x x A x l ----=+- 110, 其中A 为常数,利用()1=k k x l 得 ()()()()n k k k k k k x x x x x x x x A ----=+- 1101, 故 ()()()() n k k k k k k x x x x x x x x A ----= +- 1101 , 即 ()()()()()()()()∏ ≠=+-+---=--------=n k j j j k j n k k k k k k n k k k x x x x x x x x x x x x x x x x x x x x x l 0110110)( . 对于()),,1,0(n i x l i =,有 ()n k x x l x n i k i k i ,,1,00 ==∑=,特别当0=k 时,有 ()∑==n i i x l 0 1. 2.什么是牛顿基函数?它与单项式基{ }n x x ,,,1 有何不同? 答:称()()()(){ }10100,,,,1------n x x x x x x x x x x 为节点n x x x ,,,10 上的牛顿基函数,利用牛顿基函数,节点n x x x ,,,10 上的n 次牛顿插值多项式()x P n 可以表示为 ()()()()10010---++-+=n n n x x x x a x x a a x P 其中[]n k x x x f a k k ,,1,0,,,,10 ==.与拉格朗日插值多项式不同,牛顿插值基函数在增加节点时可以通过递推逐步得到高次的插值多项式,例如 ()()()()k k k k x x x x a x P x P --+=++ 011,

《计算机应用基础》综合练习题(二)及答案

《计算机应用基础》综合练习题(二)及答案 第1题、在Internet Explorer中,将https://www.doczj.com/doc/d33301223.html,加入可信站点,通过管理员认可,才能运行可信站点中的ActiveX控件和插件。 第1题操作步骤: 1.选择“开始”菜单中“设置”子菜单中的“控制面板”命令,打开“控制面板”窗口。2.在“控制面板”窗口中单击“网络和Internet连接”。 3.在“网络和Internet连接”窗口中单击“Internet选项”,打开“Internet属性”对话框。 4.打开“安全”选项卡,单击“受信任的站点”图标。 5.单击“站点”按钮,打开“可信站点”对话框。 6.在文本框中输入https://https://www.doczj.com/doc/d33301223.html,,单击“添加”按钮。 7.单击“确定”按钮,返回“Internet属性”对话框。 8.在“Internet属性”对话框中,单击“自定义级别”按钮,打开“安全设置”对话框。9.在“运行ActiveX控件和插件”下选择“管理员认可”选项,单击“确定”按钮,返回“Internet属性”对话框。 10.单击“Internet属性”对话框中的“确定”按钮,操作完成。 第2题、将InternetExplorer设置为取消智能图像抖动,不显示图片,不在媒体栏中显示联机媒体内容。 第2题操作步骤: 1.打开InternetExplorer。 2.选择“工具”菜单中的“Internet选项”命令,打开“Internet属性”对话框。 3.选择“高级”选项卡,取消“多媒体”栏下的“智能图像抖动”选项;取消“多媒体”栏下的“显示图片”选项;选中“多媒体”栏下的“不在媒体栏显示联机媒体内容”选项。4.单击“确定”按钮,操作完成。 第3题、为了更好地管理OutlookExpress发送的邮件,请做如下设置:自动将我的回复对象添加到通讯簿,在撰写邮件时自动完成电子邮件地址,将发送国际邮件时的默认编码设置为日文(JIS),回复邮件时总是使用英文标头。 第3题操作步骤: 1.打开OutlookExpress。 2.选择“工具”菜单中的“选项”命令,打开“选项”对话框。 3.选择“发送”选项卡,选中“自动将我的回复对象添加到通讯簿”和“在撰写邮件时自动完成电子邮件地址”两个选项。

二级第二章练习题

第二章练习题 单选题 41.()素质测评可以鉴定一个人是否具备某种素质以及具备的程度。 A.选拔性 B.考核性 C.开发性 D.诊断性 42.()可以将不同类别.不同质的素质测评对象进行比较。 A.等距量化 B.当量量化 C.类别量化 D.模糊量化 43.下列关于心理素质的说法.不正确的是()。 A.心理素质控制和调节人的能力发挥 B.心理素质属于结构性素质测评体系要素 C.心理素质包括智能素质.品德索质和文化素质 D.心理素质从动态的角度反映了人的素质及其功能 44.测评学习能力的最简单有效的方法是()。 A.心理测验 B.面试法 C.投射技术 D.情境测验 45.()是当前人员招聘面试发展的主流。 A.结构化面试 B.非结构化面试 C.单独面试 D.一次性面试 46.在面试过程中,面试考官不恰当的行为是()。 A.向应聘者澄清一些疑问 B.就某一问题充分发表自己的意见 C.向应聘者提问,时间不宜过长 D.向应聘者提供企业和岗位的信息 47.“假如现在让你做公司的财务总监,你会怎么做?”这类面试问题属于()。 A.背景性问题 B.情境性问题 C.思维性问题 D.经验性问题 48.()被认为是当代人力资源管理中识别有才能管理者的最有效工具。 A.评价中心 B.面试 C.心理测试 D.笔试

49.下列关于无领导小组讨论的说法,不正确的是()。 A.对评价者和测评标准的要求较高 B.题目的质量影响测评的质盘 C.应聘者的表现易受同组成员影响 D.被评价者的行为没有伪装的可能 多选题 96.人岗匹配包括()。 A.岗位与岗位之间相匹配 B.员工与员工之间相匹配 C.工作报酬与员工贡献相匹配 D.工作要求与员工素质相匹配 E.工作报酬与员工学历相匹配 97.员工测评标准体系的行为环境要素包括员工的()。 A.工作表现 B.所处环境 C.身体素质 D.心理素质 E.工作业绩 98.对员工素质测评结果进行文字描述,所需材料包括:()。 A.测评手册 B.测评说明 C.测评示范 D.测评理论 E.影响因素分析 99.企业员工招聘的下列观点或行为,正确的有()。 A.简历能代表应聘者的素质 B.学历比工作经历更重要 C.要给应聘者更多的表现机会 D.不要忽视求职者的个性特征 E.要让应聘者更多地了解企业 100.无领导小组讨论的特点包括()。 A.具有生动的人际互动效应 B.组织的成本较大,效率较低 C.讨论过程真实,易于客观评价 D.被评价者难以掩饰自己特点 E.无法在被评价者之间产生互动 101.无领导小组讨论的前期准备工作包括()。 A.编制题目 B.设计评分表 C.确定讨论小组 D.编制计时表 E.选定设备器具

小学二年级奥数题图形

一、计算题。( 共101题) 1.图2-26是由四个扁而长的圆圈组成的,在交点处有8个小圆圈.请你把1、2、3、4、5、6、7、8这八个数分别填在8个小圆圈中。要求每个扁长圆圈上的四个数字的和都等于18。 2.在图2-24中,三个圆圈两两相交形成七块小区域,分别填上1~7七个自然数,在一些小区域中,自然数3、5、7三个数已填好,请你把其余的数填到空着的小区域中,要求每个圆圈中四个数的和都是15。 3.图2-23中有三个大圆,在大圆的交点上有六个小圆圈。请你把1、2、3、4、5、6六个数分别填在六个小圆圈里,要求每个大圆上的四个小圆圈中的数之和都是14。 4.将2、4、6、8、10、12、14、16、18填在下面图表,使每一横行、竖行、斜行的三个数相加的和都相等。 5.仔细观察下面的图形,找出变化规律,猜猜在第3组的右框空白格内填一个什么

样的图? 6.请看下图,共有多少个正方形? 7.仔细观察这些图案可以发现,他们是按照下面这5个图案为一组,循环往复排列的,请问第52个图形是什么? 8.把上面一排的立体图形剪开,可以剪成下面哪种图形的样子?动手试一试。 9.请把下图中长方形分成形状相同、大小相等的两块,然后再拼成一个正方形. 10.在空格中填入合适的数

11.下图表示"宝塔",它们的层数不同,但都是由一样大的小三角形摆成的。仔细观察后,请你回答: (1)五层的"宝塔"的最下层包含多少个小三角形? (2)整个五层"宝塔"一共包含多少个小三角形? (3) 从第(1)到第(10)的十个"宝塔",共包含多少个小三角形? 12.数一数,有( )个长方形。 13.请你将下面图形分成形状大小相同的四部分,你能行吗? 14.请你将下面的图形拼成一个大长方形的宣传板,上面从左到右写着"快乐学习"几个字。请你在大长方形图中将这几个字表示出来。

最新模块一、二综合练习题答案

模块一、二综合练习题答案 1 2 一.判断题 3 1、计算车外圆的切削速度时,应按照已加工表面的直径数值进行计算。(×) 2、刀具前角的大小,可以是正值,也可以是负值。(√) 4 5 3、刀具的主偏角具有影响切削力、刀尖强度、刀具散热的作用。(√) 6 4、金属的切削过程也是形成切屑和已加工表面的过程。(√) 7 5、精加工相对于粗加工而言,刀具应选择较大的前角和较小的后角。(×) 8 6、刃倾角的作用是控制切屑的流动方向并影响刀头的强度,所以粗加工应选负值。9 (√) 7、切削加工中,常见机床的主运动一般只有一个。(√) 10 11 8、工艺系统刚性较差时(如车削细长轴),刀具应选用较大的主偏角。(√) 12 9、粗车主要目的是切除工件上的大部分余量,精车的主要目的是保证工件的精度和减 小表面粗糙度Ra值。(√) 13 14 10、车削加工不宜加工硬度在30HRC以上的淬火钢。(√) 15 11、90度车刀(偏刀),主要用来车削工件的外圆、端面和台阶。(√) 16 12、一夹一顶装夹,适用于工序较多、精度较高的工件。(×) 17 13、两顶尖装夹方式适用于装夹重型轴类零件。(×) 18 14、两顶尖装夹粗车工件,由于支承点时顶尖,接触面积小,不能承受较大切削力, 不宜使用。(√) 19 20 15、车削内孔时排屑和冷却较困难。(√) 21 16、圆柱孔的测量比外圆测量困难。(√) 17、车削套类零件的刀柄受孔径及孔深的影响,刚性较差。(√) 22 1

23 18、麻花钻可以在实心材料上加工内孔,不能用来扩孔。(×) 24 19、车孔时的切削用量应比车外圆低一些。(√) 25 20、细长轴通常用一夹一顶或两顶尖装夹的方法来加工。(√) 26 21、为了防止和减少薄壁零件工件加工时产生变形,加工时应分粗、精车。(√)27 22、车削薄壁零件时,尽量不用径向夹紧法,最好用轴向夹紧法。(√) 28 23、车削短小套类零件时,为保证内、外圆轴线的同轴度,可用一次装夹车削。(√)29 24、在立式铣床上不能加工键槽。(×) 30 25、卧式铣床主轴的中心轴线与工作台面垂直。(×) 26、精铣时一般选用较高的切削速度、较小的进给量和切削深度。(√) 31 32 27、在板块工件上铣直槽,一般用三面刃铣刀。(√) 33 28、在轴上的平键槽,一般在立铣床上用键槽铣刀加工。(√) 34 29、插床也是利用工件和刀具作相对直线往复运动来切削加工的,它又称为立式刨床。 35 (√) 36 30、刨削加工常用在大批大量的生产中。(×) 37 31、现在很多应用场合,铣床常被用来代替刨床加工。(√) 38 32、在镗床上镗孔可以保证箱体类零件上孔系间的位置精度。(√) 39 33、拉削一般用于单件小批生产。(√) 40 34、砂轮的硬度就是磨粒的硬度。(×) 41 35、磨削外圆时,工件的转动是主运动。(×) 36、砂轮的磨粒号越大,磨粒尺寸也越大。(×) 42 43 37、砂轮是由磨粒、结合剂和空隙组成的多孔物体。(√) 2

二级专业能力第二章投资规划练习题2

理财规划师国家职业资格二级专项练习题投资规划(二级) 1、理财规划师要对客户投资相关信息进行分析,下列不属于理财师所要分析的相关投资信息是( )。 A. 相关财务信息 B. 现有投资组合信息 C. 未来需求信息 D. 风险偏好情况 2、理财规划师在对宏观经济形势进行分析和预测时,要注意的事项不包括( )。 A. 关注经济统计信息,掌握实时的经济运行变动情况 B. 密切关注各种宏观经济因素,如利率、汇率、税率的变化 C. 对各项宏观指标的历史数据和历史经验进行分析 D. 关注网上论坛的议论和评价 3、通过对客户的现有投资组合进行分析,理财规划师不需要强调的问题是( )。 A. 明确客户现有投资组合中的资产配置状况 B. 注意客户现有投资组合的突出特点 C. 根据经验或者规律,对客户现有投资组合情况作出评价 D. 根据经验或者规律,对客户将来投资组合情况作出评价 4、客户的风险偏好信息属于客户的判断性信息。一般来说,客户的风险偏好可以分为五种类型,其中不包括( )。 A. 保守型 B. 轻度保守型 C. 高度进取型 D. 轻度进取型 5、客户的收入由( )共同构成。 A. 正常性收入和非正常性收入 B. 经常性收入和非经常性收入 C. 基本收入和投资收入 D. 工资收入和投资收入 6、对客户收入信息应掌握的内容不包括( )。 A. 客户各项预期家庭收入的来源 B. 客户各项预期家庭收入的规模 C. 客户预期家庭收入的结构 D. 客户现在家庭收入的结构 7、( )是指一般需要10年以上的时间才能实现的愿望。 A. 短期目标 B. 中期目标 C. 长期目标 D. 长远目标 8、对于长期投资目标,应在资产配置上侧重于长期增值潜力较大的投资工具,不包括( )。 A. 股票 B. 不动产 C. 货币市场基金 D. 收藏品 9、股票的价格越贴近每股净资产,股票的价格就越接近股票的( ) A. 面值 B. 净值 C. 清算价值 D. 市场价值 10、股利贴现法的基本思想是假设股票一直持有,那么投资者可以获得股票持有期间的所 有红利,因此当前的股票价值就等于( )。 A. 未来所有期限上的红利的现值之和 B. 未来所有期限上的红利的终值之和 C. 现在的红利 D. 现在和未来的红利之和 11、( )是假定红利固定不变,即红利增长率为零。 A. 零增长模型 B. 稳定增长模型 C. 非稳定增长模型 D. 红利增长模型 12、投资者收到A公司支付的每股0.6元的上年度股利,而且以后各年都将保持与本年度相 同的股利,投资者要求的股票收益率为10%,那么A公司对投 资者来讲,每股价值为( )元。 A. 3 B. 4 C. 5 D. 6

二年级奥数.几何.巧求周长 (2)

把下面图形的边框勾成蓝色. 封闭图形一周的长度,就是这个图形的周长. 让学生更直观的来认识什么是图形的周长,然后让学生把图形的周长画一画,更能加深对“周长”这 个抽象概念的理解. 怎样才能知道图形 的周长是多少?怎样来求呢?这节课我们就先从简单的长方形和正方形的周长开始研究吧! 【例1】 小精灵来到篮球场打球,发现篮球场是一个长方形的,他和小朋友量了量,这个篮球场长28米,宽15米.这个篮球场的周长是多少米? 【例2】 打完球小精灵累的满头大汗,这时小白兔送上来了一个手帕为他擦擦汗.这个手帕是正 方形的,量了量每条边的长是2分米,这个正方形手帕的周长是多少? 【例3】 比一比,赛一赛.下面图形的周长,看谁算得快 巧求周长 发现不同 知识框架 例题精讲

【例4】Hello Kitty去商场买回来一面镜子.她要沿镜子的四边做一个铝合金的边框,请你帮助算一算,大约需要多少米长的铝合金材料? 【例5】明明用一根长30分米的黑线,给自己的照片镶了一条黑边,这个长方形相框的宽是 6分米,你知道这个相框的长是多少分米? 【例6】小明家有一个正方形的花坛,这个正方形的花坛边长是 6米,在这个正方形花坛的四周围上栏杆,栏杆长多少米?

【例7】 红红用一根28厘米的铁丝,围成了一个正方形,这个正方形的边长是多少? 【例8】 两个大小相同的正方形,拼成一个长方形后,周长比原来两个正方形周长的和减少了 4 厘米,原来一个正方形的周长是多少厘米? 【例9】 如下图,你能求出这些图形的周长吗? 【例10】 求下图的周长 【随练1】 一个模型,如图,外形是两个重叠的正方形,正方形的边长是2分米,两个正方形重叠 的相交点是正方形边的中点.求这个模型的周长是多少分米? 课堂检测

第2章思考题和习题解答..

第2章 负荷计算 2-1 什么叫负荷曲线?有哪几种?与负荷曲线有关的物理量有哪些? 答:负荷曲线是表征电力负荷随时间变动情况的一种图形,反映了用户用电的特点和规律。 负荷曲线按负荷的功率性质不同,分有功负荷和无功负荷曲线;按时间单位的不同,分日负荷曲线和年负荷曲线;按负荷对象不同,分用户,车间或某类设备负荷曲线。 与负荷曲线有关的物理量有:年最大负荷和年最大负荷利用小时;平均负荷和负荷系数。 2-2 什么叫年最大负荷利用小时?什么叫年最大负荷和年平均负荷?什么叫负荷系数? 答:年最大负荷利用小时是指负荷以年最大负荷max P 持续运行一段时间后,消耗的电能恰好等于该电力负荷全年实际消耗的电能,这段时间就是最大负荷利用小时。 年最大负荷max P 指全年中负荷最大的工作班内(为防偶然性,这样的工作班至少要在负荷最大的月份出现2~3次)30分钟平均功率的最大值,因此年最大负荷有时也称为30分钟最大负荷30P 。 负荷系数L K 是指平均负荷与最大负荷的比值。 2-3 什么叫计算负荷?为什么计算负荷通常采用30min 最大负荷?正确确定计算负荷有何意义? 答:计算负荷是指导体中通过一个等效负荷时,导体的最高温升正好和通过实际的变动负荷时产生的最高温升相等,该等效负荷就称为计算负荷。 导体通过电流达到稳定温升的时间大约为(3~4)τ,τ为发热时间常数。对中小截面的导体,其τ约为10min 左右,故截流倒替约经 30min 后达到稳定温升值。但是,由于较大截面的导体发热时间常数往往大于10min ,30min 还不能达到稳定温升。由此可见,计算负荷 Pc 实际上与30min 最大负荷基本是相当的。 计算负荷是供电设计计算的基本依据。计算负荷的确定是否合理,将直接影响到电气设备和导线电缆的选择是否合理。计算负荷不能定得太大,否则选择的电气设备和导线电缆将会过大而造成投资和有色金属的浪费;计算负荷也不能定得太小,否则选择的电气设备和导线电缆将会长期处于过负荷运行,增加电能损耗,产生过热,导致绝缘体过早老化甚至烧毁。 2-4 各工作制用电设备的设备容量如何确定? 答:长期工作制和短期工作制的设备容量就是该设备的铭牌额定功率,即Pe=PN 。 反复短时工作制的设备容量是指某负荷持续率下的额定功率换算到统一的负荷持续率下的功率。 2-5 需要系数的含义是什么? 答:所有用电设备的计算负荷并不等于其设备容量,两者之间存在一个比值关系,因此需要引进需要系数的概念,即: c d e P K P =。 式中,Kd 为需要系数;Pc 为计算负荷;Pe 为设备容量。 形成该系数的原因有:用电设备的设备容量是指输出容量,它与输入容量之间有一个平

会计学原理综合练习题(二)及答案

综合练习题(二) 一、填空题 1.1494年,意大利数学家卢卡·巴其阿勒在著作《算术·几何·比与比例概要》中第一次系统地介绍的记账方法是()。 2.将会计凭证分为原始凭证和记账凭证的依据是( )。 3.记账凭证不论采用何种形式,具有多少种类,它与原始凭证的本质区别在于它载有()。 4.“固定资产”账户始终反映固定资产的(),固定资产在使用过程中因耗用而转移的价值则通过()账户反映。 5.采用借贷记账法,账户哪方记增加,哪方记减少,取决于()。6.生产费用按照其与成本计算对象的关系,可分为()和();前者一般()计入产品成本,后者则需()计入产品成本。 7.应收账款采用总价法核算的情况下,购货方享受的现金折扣应通过( )账户核算。 8.账户期末余额的大小由( )、()和()所决定。9.从原理上说,企业核算存货的数量和金额有两种基本的方法,这两种方法是()和()。 10.在实际工作中,开设账户的直接依据是()。 二、判断题 1.若商品销售后,因质量存在严重问题,同意予以退货,则不论是本期的还是以前各期的,均应冲减本期主营业务收入( ) 2.净利润等于利润总额扣减所得税费用后的净额()。 3.总账与其所属明细账的登记应该遵循“有借必有贷,借贷必相等”记账规则()。4.账户余额一般与借方发生额在同一方向()。 5.若企业期初结存的材料单位成本和本月购买的各批次材料的单位成本都不一样,则无论按照先进先出法还是按照月末一次加权平均法计算,其本期发出材料的成本也都不一样()。 6.如果按照备抵法中的应收账款余额百分比法计提坏账准备,则期末应该计提的坏账损失的发生额等于应收账款期末余额乘以计提坏账的比例减去“坏账准备”账户的期末借方余

人力资源管理师二级课后练习题第二章

第二章招聘及配置 一、简述员工素质测评的基本原理、类型和主要原则 参考答案: 【员工素质测评基本原理】 1、个体差异原理比如姐姐爱唱歌妹妹爱跳舞 2、工作差异原理比如会计和营销岗位的差别 3、人岗匹配原理人岗匹配包括:工作要求及员工素质相匹配;工作报酬及员工贡献相匹配;员工及员工之间相匹配;岗位及岗位之间相匹配. 【员工素质测评的类型】 1、选拔性测评,特点有: (1)强调测评的区分功能 (2)测评标准刚性强 (3)测评过程强调客观性 (4)测评指标具有灵活性 2、开发性测评:(为了培训的测评) 3、诊断性测评(出问题时的测评):是了解现状或查找根源为目的的测评,结果不公开;有较强的系统性 4、考核性测评:又称鉴定性测评,是指以鉴定或验证某种素质是否具备以及具备程度为目的的测评,它经常穿插在选拔测评中。 (1)概括性。 (2)结果要求有较高的信度和效度。 【员工素质测评的主要原则】 1、客观测评及主观测评相结合 2、定性测评及定量测评相结合 3、静态测评及动态测评相结合 4、素质测评及绩效测评相结合 5、分项测评及综合测评相结合 二、简述员工素质测评量化的主要形式和测评标准体系 参考答案: 【员工素质测评量化的主要形式】 1、一次量化及二次量化

(1)一次量化:对象的直接定量刻化;有明显的数量关系;直接提示了特征;一次量化又叫实质量化 (2)二次量化:先定性描述再间接定量;没有明显的数量关系;但具有质量或程度差异;称之为形式量化 2、类别量化及模糊量化 (1)类别量化:先划分到几个类别中,特点:每个对象只属于一个类别,每个对象不能同时属于两个以上的类别,只是一种符号性无大小之分(管理用1,技术用2表示) (2)模糊量化:先归类,给对象隶属程度赋值;分类界限无法明确,或测评者认识模糊和无法把握(民主用1,专制用2表示) 4、当量量化:所谓当量量化,就是先选择一中介变量,把诸种不同类别或并不同质的素质测评对象进行统一性的转化. 【员工素质测评标准体系】 素质测评标准体系的要素有标准、标度和标记三要素组成。 1、标准:所谓标准,就是指测评标准体系的内在规定性 2、标度:所谓标度,即对标准的外在形式划分,常常表现为对素质行为特征或表现的范围、强度和频率的规定. (1)量词式标度。例如“多”“较多”“一般”“较少”“少”等。 (2)等级式标度。例如“优”“良”“中”“差";“甲"“乙”“丙"“丁";“A”“B”“C"“D”以及“1"“2”“3”“4”等. (3)数量式标度。 (4)定义式标度。 (5)综合式标度. 3.标记:标记没有独立意义。 4、测评标准体系的构成测评标准体系设计为分为横向结构和纵向结构两个方面。横向结构是指将需要测评的员工素质的要素进行分解,并列出相应的项目;纵向结构是指将每一项素质用规范化的行为牲或表征进行描述及规定,并按层次细分。(1)测评标准体系的横向结构:可以概括为结构性要素、行为性要素和工作绩效要素三个方面。 (2)测评标准体系的纵向结构: 5、测评标准体系的类型 (1)效标参照性标准体系 (2)常模参照性指标体系

图形与几何专项复习题 二年级上册数学

1、我们学过的长度单位有()和()。用字母表示分别是()和()。 2、线段有()个端点。 3、我的“一拃”长约()厘米。 4、我的食指的宽大约是()厘米。我的脚长约()厘米。我的“一步” 长约()厘米。 5、量物体的长度,要把尺子的刻度()对准物体的左端,再看物体的右端对着几。 6、在你的学生直尺上,从刻度3到刻度12之间的长度是(),数一数,自己 的直尺上共有()个1厘米。 7、一根木棒比一米短1厘米,这根木棒长()厘米。 8、直尺上“0”到“8”之间是()厘米,“5”到“9”之间是()厘米。 9、测量教学楼的宽用()作单位比较合适。 10、38米+7米=()米 1米=()厘米 19厘米—7厘米=()厘米 40厘米+60厘米=()厘米=()米 3米+100厘米=()米 11、角有()个顶点,()条边。 12、从一个点起,用()向不同的方向画()条()的线,就画成一个()。 13、直角有()个顶点,()条边,用()可以画出一个直角。()角比直角大,()角比直角小。 14、三角形有()个顶点,()条边。 正方形有()个顶点,()条边。 长方形有()个顶点,()条边。 长方形和正方形都有()个直角。 15、一条红领巾上有()个锐角,()个钝角。一个三角尺上有()个角, 其中有()个直角。 16、钟面上有()个数,有()针和()针。时针走一个大格是()时, 走三个大格是()时。时针从一个数字走到下一个数字是()时,时针从1走到12,走了()时。 17、早上,冬冬7:35到校,莉莉7时半到校,明明7:40到校,他们三人()到校最早,()到校最晚。 18、分针走一个大格是()分,走三个大格是()分,也可以说成是()。 分针走一个小格是()分,走三个小格是()分。分针走6个大格是()分,也可以说成是()。 19、分针从12走到6,走了()分。时针从12走到6,走了()分。分针 从3走到10,走了()分。时针从12开始绕了一圈又走回12,走了()时。 20、1时=()分 21、6 : 30过5分是() 7 :20过10分是() 5 : 45过一刻是() 3 : 00过半小时是() 22、4时5分在电子表上显示为()。 23、钟面上,时针指向12和1之间,分针指向刻度3,此时的时间是()。 24、分针指向12,时针指向3是()。分针指向6,时针指在3和4之 间是()。分针指向5,时针指在8和9之间是()。 25、()时整,时针和分针成一条直线(不重合);()时整,分针和时 针重合。 26、现在是8时,再过2时是()。时针从2走到5,走了()时。分针从2走到5,走了()分。 27、我们一节课是()分。再加上()分是1时。 28、()时整,时针和分针形成的角是直角。 29、用7和8这两个数字能组成()个没有重复数字的两位数,分别是()。 30、四个同学要照相,每两个人都要照一张合影,最后四个人再合一张影,一共有()张合影。 31、有四个同学握手。每两个人握一次手,可以握()次。 32、有2、3、9三个数,任意选取其中2个数求和,得数有()种可能。 33、小红、小芳和小丽三人,每两个人照一张相,共可以照()张不同的照片。 34、我家有桃、香蕉和桔子三种水果。如果我每天吃一种水果,每天有()种不同的选择。如果每天我要吃两种水果,每天我有()种不同的选择。 35、我有3条裤子,2件上衣,有()种不同的穿法。 36、小明和爸爸妈妈准备照一张全家福。照相时,他们三人排成一排,有()种不同的排法。 37、用3、8、5能摆成哪几个两位数? 38、用3、8、5能摆成哪几个三位数? 39、小明从家到学校要走15分钟,他每天早晨7:40从家出发,几时几分到达学校?

第2章 复习思考题答案

第2章复习思考题答案 1.Q235钢的应力—应变曲线可以分为哪4个阶段,可得到哪些强度指标? (1)弹性阶段。 钢材在此阶段,当荷载降为零时(完全卸载),变形也降为零(回到原点)。Q235钢的比例极限f p≈200N/mm2,对应的应变εp≈0.1%。 (2)弹塑性和屈服阶段。 当应力超过弹性极限后,应力与应变不再成正比,应变增大加快,材料进入弹塑性阶段。随后,应力呈锯齿状波动,甚至出现应力不增加而应变仍在继续发展的现象,卸载后试件不能完全恢复原来的长度,这个阶段称之为屈服阶段。Q235钢的屈服点f y≈235N/mm2,对应的应变εp≈0.15%,流幅ε≈0.15%~2.5%。 (3)强化阶段。 屈服阶段之后,曲线再度上升,但应变的增加快于应力的增加,塑性特征明显,这个阶段称为强化阶段。对应于最高点的应力为抗拉强度或极限强度fu。 (4)颈缩阶段。 到达极限强度后,试件出现局部截面横向收缩,塑性变形迅速增大,即颈缩现象。此时,只要荷载不断降低,变形能继续发展,直至试件断裂。 2.什么叫屈强比,它对结构设计有何意义? 钢材的屈服强度(屈服点)f y与抗拉强度fu的比值,称为屈强比。屈强比是衡量钢材强度储备的一个系数。屈强比越低,结构零件的可靠性越高,一般碳素钢屈强比为0.6-0.65,低合金结构钢为0.65-0.75,合金结构钢为0.84-0.86。屈强比愈低钢材的安全储备愈大,但屈强比过小时,钢材强度的利用率太低,不够经济;屈强比过大时,安全储备太小,且构件变形能力小。 3.什么叫塑性破坏和脆性破坏?各有什么特征? 钢材在静力单向均匀拉伸下,试件破坏前有很大的塑性应变,这种破坏称为塑性破坏。钢结构中的钢材因受各种因素的影响还会发生另一种破坏,即脆性破坏,两者的破坏特征有明显的区别。 塑性破坏是指构件产生明显的变形、应力达到材料的极限强度后而发生的破坏,破坏断口呈纤维状,色泽发暗,破坏前有较大的塑性变形,且变形持续时间长,容易及时发现并采取有效补救措施,通常不会引起严重后果。 脆性破坏是在塑性变形很小,甚至没有塑性变形的情况下突然发生的,破坏时构件的计算应力可能小于钢材的屈服点fy,破坏的断口平齐并呈有光泽的晶粒状。由于脆性破坏前没有明显的征兆,不能及时觉察和补救,破坏后果严重。 4.钢结构对钢材有哪些要求? 为了保证结构的安全,钢结构所用的钢材应满足以下要求: (1)强度钢材的强度指标主要有屈服强度(屈服点)fy和抗拉强度fu,可通过钢材的静力单向拉伸试验获得。屈服强度fy和抗拉强度fu是承重结构所用钢材应具有的基本保证项目,对一般非承重结构构件所用钢材只要保证抗拉强度即可。 (2)塑性塑性是指钢材在应力超过屈服点后,能产生显著的残余变形(塑性变形)而不立即断裂的性质。衡量钢材塑性好坏的主要指标是伸长率δ和截面收缩率ψ,它由钢材的静力单向拉伸试验得到。承重结构用的钢材,不论在静力荷载或动力荷载作用下,以及在加

高三英语综合练习题二试题及答案

高三英语综合练习题二 I . 语言知识及应用(共两节,满分45分) 第一节:完形填空(共15小题;每小题2分,满分30分) I grew up in a tiny Baltimore row house in a faraway mountain area. My parents ___1___ the necessities of life but couldn’t give much more. If I asked my father for a pair of jeans, he would say, “ If you want them, make the money and buy them yourself.” He wasn’t being mean; he just couldn’t ___2___ them. From age 12 on, I did part-time jobs after school. When I ___3___ from high school, I joined the navy. Soon I was in a boot camp(新兵训练营) at Parris Island, S.C., where I learned that life in the navy centered around completing daily ___4___. These could be anything from cleaning the camp to conducting mock(模拟的) battles. Completing these tasks successfully ___5___ discipline, team-work and responsibility. I didn’t ___6___ whether you were black, white or Asian; everyone worked together for the ___7___ of the company. I went on to graduate from the U.S. Naval Academic and later became an officer in the navy. The part of my job I ___8___ most was the consoling(咨询) meetings I ___9___ with the family members of the men and women in my ___10___, trying to help them deal with the long periods of ___11___. These proved popular and word of them spread. Before long I was being asked to give encouraging ___12___ to business groups, educators and kids across the country. But I consider the boot camp my first real ___13___, and my life is still guided by the ___14___ lessons I learned there. It taught me discipline, friendship and the pride related to setting a task every day and working hard to ___15___ it. 1. A. provided B. got C. made D. bought 2. A. pay B. find C. produce D. afford 3. A. came B. returned C. escaped D. graduated 4. A. drills B. tasks C. exercises D. reports 5. A. included B. asked C. required D. met 6. A. matter B. mean C. exist D. work 7. A. good B. staff C. rest D. right 8. A. took B. hated C. enjoyed D. did 9. A. ended B. began C. continued D. held 10.A. charge B. situation C. position D. choice 11.A. lessons B. meetings C. training D. separation 12.A. gifts B. descriptions C. speeches D. performances 13.A. vacation B. place C. job D. travel 14.A. important B. bitter C. normal D. difficult 15.A. gain B. achieve C. show D. match 第二节语法填空(共10小题;每小题1.5分,满分15分) Before the 1850’s, the United States had a number of small colleges, most of them

第二章练习题及答案

第二章练习题及答案 一、单项选择题: 1、在财务会计中,应当将销售费用归属于下列各项中的()。 A.制造费用 B.主要成本 C.加工成本 D.非生产成本 2、按照管理会计的解释,成本的相关性是指() A.与决策方案有关的成本特性 B.与控制标准有关的成本特性 C.与资产价值有关的成本特性 D.与归集对象有关的成本特性 3、阶梯式混合成本又可称为() A.半固定成本 B.半变动成本 C.延期变动成本 D.曲线式成本 4.将全部成本分为固定成本、变动成本和混合成本所采用的分类标志是( ) A.成本的目标 B.成本的可辨认性 C.成本的经济用途 D.成本的性态 5、在历史资料分析法的具体应用方法中,计算结果最为精确的方法是()。 A.高低点法 B.散布图法 C.回归直线法 D.直接分析法 6、当相关系数r等于+1时,表明成本与业务量之间的关系是()。 A.基本正相关 B.完全正相关 C.完全无关 D.基本无关 7、在不改变企业生产经营能力的前提下,采取降低固定成本总额的措施通常是指降低()。 A.约束性固定成本 B.酌量性固定成本 C.半固定成本 D.单位固定成本 8、单耗相对稳定的外购零部件成本属于()。 A.约束性固定成本 B.酌量性固定成本 C.技术性变动成本 D.约束性变动成本 9、下列项目中,只能在发生当期予以补偿,不可能递延到下期的成本是()。 A.直接成本 B.间接成本 C.产品成本 D.期间成本 10、为排除业务量因素的影响,在管理会计中,反映变动成本水平的指标一般是指()。 A.变动成本总额 B.单位变动成本 C.变动成本的总额与单位额 D.变动成本率 11、在管理会计中,狭义相关范围是指() A.成本的变动范围 B.业务量的变动范围 C.时间的变动范围 D.市场容量的变动范围 12、在应用历史资料分析法进行成本形态分析时,必须首先确定a,然后才能计算出b的方法时() A.直接分析法 B.高低点法 C.散布图法 D.回归直线法 13、某企业在进行成本形态分析时,需要对混合成本进行分解。据此可以断定:该企业应用的是() A.高低点法 B.回归直线法

相关主题
文本预览
相关文档 最新文档