当前位置:文档之家› 词汇练习题

词汇练习题

词汇练习题
词汇练习题

一、选择

1、语素是语言中最小的()

A、语音单位 B 、表意单位 C、造句单位D、语音语义结合单位

2、语言随着社会的变化而变化,其中变化最迅速、最频繁的是()

A、语音

B、词汇

C、语法

D、以上都不对

3、属于不成词语素的是()

A、虎狗

B、鸡、鸭

C、人、学

D、习、民

4、“革命”的构词方式是()

A、支配式

B、补充式

C、偏正式

D、并列式

5、“星星”是()

A、叠音词

B、重叠式合成词

C、连绵词

D、并列式合成词

6、“玫瑰”是()

A、叠韵词

B、双声词

C、译音词

D、非双声叠韵词

7、下列各组词中加点的字都属于词缀的是()

A、砖头船头

B、瓜子莲子

C、女儿花儿

D、老虎老师

8、下列各组加点的词中,属于同音词的是()

A、黑夜黑心肠

B、空箱子空想

C、鲜花花钱

D、黑暗暗杀

9、“热爱”和“酷爱”的区别是()

A、词义的范围不同

B、词义的轻重不同

C、感情色彩不同

D、语体色彩不同

10、“马”、“马匹”的区别是()

A、集体和个体的不同

B、范围大小不同

C、性状特征不同

D、语体色彩不同

11、“明亮”在“光线充足”意思上的反义词是()

A、昏暗

B、暗淡

C、模糊

D、黝黑

12、下列表述错误的是()

A、“铁路”、“铁道”是等义词

B、“脚踏车”、“自行车”是近义词。

C、“交换”、“交流”搭配对象不同

D、“成果”、“后果”感情色彩不同。

13、和“粉饰”构词方式一致的一组词是()

A、拖鞋货车

B、杏黄动心

C、蓝天司机

D、打倒大刀

14、下面的词语中属于熟语的是()

A、开放改革

B、解放军

C、风声鹤唳

D、穿小鞋

15、“打毛衣”的“打”用的是这个词的()

A、本义

B、基本义

C、引申义

D、比喻义

16、下面的成语有用字错误的是()

A、当仁不让

B、哄堂大笑

C、病入膏肓

D、草简人命

二、填空题

17、语言中最小的音义结合体是语素;按音节分,它可分为单音节语素,双音节语素和多音节语素;按构词功能分,可分为成词语素和非成词语素。

18、“春天来了”共包含 4个语素, 3个词。

19、由一个语素构成的词叫做单纯词,合成词是由2个或2个以上语素构成的词。合成词有三种构词方。

20、是词义中的核心部分,除此之外,还有附属的意义叫,它包括三种类型。

21、词的本义是词的意义,是词的现代最常用的意义,它相对于转义而言,转义主要通过和两种方法产生。

22、义素是构成词义的,也就是词义的。

23、基本词汇的三个主要特点是。

24、词义演变的途径有以下几种:1、 2、 3、。

三、判断题。

25、词和词汇的关系是个体与集体的关系,无论如何,词汇不能用来指单个的词。

26、连绵词的两个音节连在一起才有意义,不能分开取解释各个音节的意义。

27、合成词都是由两个语素构成的。

28、“孩子”、“瓜子”的“子”都是词缀。

29、单义词没有歧义,不少科学术语、鸟兽、草木、器物的名称都是单义词。

30、“生”与“死”是一对极性反义词。

31、词在使用过程中产生了新义不算出现了新词。

32、基本词汇和一般词汇的界线是不可逾越的。

33.有一部分行业语往往既有存在专门的意义,又有普通的意义。

34、汉语的成语都是四个字组成的。

四、分析题

35、指出下列词的结构方式。

(1)拖鞋(2)鹅黄(3)纠正(4)强制(5)脱鞋(6)民主、(7)地震(8)动静(9)窗户(10)黄金周(11)推广(12)重判(13)点心(14)枪支(15)破产(16)心虚

36、指出下列词中的单义词和多义词

(1)群众(2)新生(3)杜鹃(4)疙瘩(5)韵母(6)风(7)电子(8)杜绝(9)后(10)茶(11)创伤(12)究竟

(13)函数(14)非法(15)合同(16)近视

37、辨析同义词

(1)坚强——顽强

(2)忽然——突然

(3)船只——船

(4)交流——交换

38、简答题

(1)简述词、语素、字的关系与区别。

(2)词的比喻义与修辞上的比喻有什么区别和联系?

(3)什么是义素,义素分析有什么用处?

(4)举例说明外来词的类型。

(5)你如何看待词汇规范化?

词汇部分练习题答案

一、选择题

1、D

2、B

3、D 4 、A 5、B 6、A 7、D 8. C 9、 B 10、 A 11、A 12、

B 13、A 14、 D 15、

C 16、D

二、填空题

17、语素,单音节语素,双音节语素,多音节语素,成词语素,不成词语素。

18、4,3.

19、单纯词,两个或两个以上语素,复合式,重叠是,附加式。

20、理性义,色彩义,感情色彩,语体色彩,形象色彩。

21、原始意义,基本义,引申,比喻。

22、最小意义单位,语义特征。

23、稳固性,能产性,全民常用性。

24、词义的扩大,词义的缩小,词义的转移。

三、判断题

25、√ 26、√27、× 28、×29√、30、×31、√32、33、√34、×

四、分析题

35、指出下列词的结构方式。

(1)偏正(2)偏正(3)补充(4)偏正(5)动宾(6)主谓

(7)主谓(8)联合(9)联合(10)偏正(11)补充(12)偏正(13)动宾(14)补充(15)动宾(16)主谓

36、指出下列词中的单义词和多义词

(1)多义词(2)多义词(3)单义词(4)多义词(5)单义词(6)多义词(7)单义词(8)多义词(9)多义词(10)单义词(11)多义词(12)多义词(13)单义词(14)多义词

(15)单义词(16)多义词

37、辨析同义词(要点)

(1)感情色彩不同

(2)词性不同,语法功能不同

(3)集体和个体不同

(4)搭配对象不同

38、简答题

(1)简述词、语素、字的关系与区别。

答:词、语素、字的关系比较复杂。概括而言,词是由语素组成,汉语的语素是由一个个汉字书写的。具体来说,有以下四点。第一,语素和词是从语言学角度划分出来的语言单位,而字是从书写单位角度划分出来的书写形体单位。第二,词和语素的层级不同。词是比语素高一级的语言单位,由一个或多个语素构成。第三,词表示的意义比较明确和固定,语素表示的意义往往不具体或不固定,必须在它所构成的词里才能明确的显现出来。第四,词、语素、字不是一一对应的关系,一个汉字可以对应一个语素,一个词,也可以多个汉字对应一个语素,一个词,一个汉字可以对应多个语素,多个词。

(2)词的比喻义与修辞上的比喻有什么区别和联系?

答:词的比喻义是通过比喻用法固定在词中的意义,属于词汇学范畴。比喻是利用甲事物比况乙事物,属于修辞学范畴。词的比喻义是固定的,在辞典上可以查阅。修辞上的比喻所赋予的意义是临时的,只在具体的上下文中才能确定所比喻的意义是什么,这个意义在词典中没有。当然,一个词的比喻用法比较普遍时,就会逐渐固定下来成为词的比喻义。(3)什么是义素,义素分析有什么用处?

答:义素是构成词义的最小意义单位,也就是词义的区别特征。义素分析法是分析词义的一种新的方法,它系统地反映词义之间的相互区别与

联系,为词义分析的形式化、精确化提供了新的途径。具体说,义素分析可以帮助我们准确的理解、解释词义;可以显示词义之间的区别与联系;可以体现词义的组合关系和聚合关系。

(4)举例说明外来词的类型。(要点)

答:音译外来词;音意兼译外来词;音译加意译外来词;字母外来词。(5)你如何看待词汇规范化?(要点)

答:词汇的规范化应该考虑四个主要原则:必要性;普遍性;明确性;准确性。词汇的规范化工作主要有以下几个方面:方言词的规范;外来词的规范;古语词的规范;新词的规范。

现代汉语词汇部分练习题七

现代汉语词汇部分练习题七 本人精心整理的文档,文档来自络 本人仅收藏整理 如有错误 还请自己查证! 现代汉语词汇部分练习题 一、填空 1、从分布位置看语素可分为___________和___________ 2、单纯词是指由_____________构成的词 3、合成词是指由_____________构成的词 4、词根是词中表示_____________、位置___________的语素 5、词缀是在词中表示___________、位置__________的语素 6、词汇是语言里________和________的总汇 7、语素是__________结合体

8、词是表示_________、__________的最小语言单位 9、从语音构成角度来看 语素可分为??????_________和___________ 10、从语法功能看 语素可分为___________和___________ 11、双音节单纯词可分为___________、________和__________、_________四种 12、附加式合成词分为_____________和________两种 13、复合式的合成词有___________、_________、_________、_______、_____五种结构类型 14、简称常见的简缩方式有三种:(1)__________(2)_________(3)________ 15、词义是______________________反映 它包含着人们_____________

16、词义具有_________、___________ 、_________三种性质 17、本义就是__________意义 18、基本义是__________的意义 19、引申义是__________的意义 20、比喻义是__________的意义 21、词义的发展变化主要有________、__________、________三种方式 _______的词叫单义词 22、多义词是指__________的词 23、同音词是指__________而________的词 24、同音词可分为两类:___________和_______________ 25、同音异形词产生的原因主要有两条:(1)

宏观经济学思考题及参考答案

宏观经济学思考题及参考答案(1) 第四章 基本概念:潜在GDP,总供给,总需求,AS曲线,AD曲线。 思考题 1、宏观经济学的主要目标是什么?写出每个主要目标的简短定义。请详细解释 为什么每一个目标都十分重要。 答:宏观经济学目标主要有四个:充分就业、物价稳定、经济增长和国际收支平衡。 (1)充分就业的本义是指所有资源得到充分利用,目前主要用人力资源作为充分就业的标准;充分就业本不是指百分之百的就业,一般地说充分就业允许的失业范畴为4%。只有经济实现了充分就业,一国经济才能生产出潜在的GDP,从而使一国拥有更多的收入用于提高一国的福利水平。 (2)物价稳定,即把通胀率维持在低而稳定的水平上。物价稳定是指一般物价水平(即总物价水平)的稳定;物价稳定并不是指通货膨胀率为零的状态,而是维持一种能为社会所接受的低而稳定的通货膨胀率的经济状态,一般指通货膨胀率为百分之十以下。物价稳定可以防止经济的剧烈波动,防止各种扭曲对经济造成负面影响。 (3)经济增长是指保持合意的经济增长率。经济增长是指单纯的生产增长,经济增长率并不是越高越好,经济增长的同时必须带来经济发展;经济增长率一般是用实际国民生产总值的年平均增长率来衡量的。只有经济不断的增长,才能满足人类无限的欲望。 (4)国际收支平衡是指国际收支既无赤字又无盈余的状态。国际收支平衡是一国对外经济目标,必须注意和国内目标的配合使用;正确处理国内目标与国际目标的矛盾。在开放经济下,一国与他国来往日益密切,保持国际收支的基本平衡,才能使一国避免受到他国经济波动带来的负面影响。 3,题略 答:a.石油价格大幅度上涨,作为一种不利的供给冲击,将会使增加企业的生产成本,从而使总供给减少,总供给曲线AS将向左上方移动。 b.一项削减国防开支的裁军协议,而与此同时,政府没有采取减税或者增加政府支出的政策,则将减少一国的总需求水平,从而使总需求曲线AD向左下方移动。 c.潜在产出水平的增加,将有效提高一国所能生产出的商品和劳务水平,从而使总供给曲线AS向右下方移动。 d.放松银根使得利率降低,这将有效刺激经济中的投资需求等,从而使总需求增加,总需求曲线AD向右上方移动。 第五章 基本概念:GDP,名义GDP,实际GDP,NDP,DI,CPI,PPI。 思考题: 5.为什么下列各项不被计入美国的GDP之中? a优秀的厨师在自己家里烹制膳食; b购买一块土地; c购买一幅伦勃朗的绘画真品; d某人在2009年播放一张2005年录制的CD所获得的价值; e电力公司排放的污染物对房屋和庄稼的损害;

短语词汇的经典测试题附答案

一、选择题 1.--- Alice’s room is tidy, isn't it? ---Yes. She always _____ her toys after playing with them. A.looks for B.puts away C.sweeps away D.pays for 2.People often make a wish before candles when they celebrate birthday. A.bringing out B.laying out C.finding out D.blowing out 3.—The fire was finally____ in Jilin on June 3. Unfortunately, 119 people lost their lives. —I hope the accident like this won’t happen again. A.put down B.put away C.put out D.put up 4.He drove at such a high speed at the turning that the car almost went ______the road. A.on B.along C.from D.off 5.--All right. I’ll take it. But I tell you, it is the last time I will ______ this kind of work. ---Come on, buddy! Don’t be so serious. A.take out B.take up C.take on D.take off 6.-What do you think of this story? -It's interesting, but Miss Lin asked us to __________ a story by ourselves, not to find one on the Internet. A.make up B.look up C.listen to D.take away 7.As the road to the airport is under repair, we will have to _______ early to get there in time. A.turn off B.take off C.put off D.set off 8.—What are you doing? —I’m looking ________ the Internet for some information for my article. A.for B.at C.up D.through 9.High technology is used in EURO 2016 to the matches are fair enough in France. A.make up B.make sure C.come out D.come over 10.My cousin is heavy because he often eats fast food. A.too much;too many B.too many;too much C.much too;too much D.too much;much too 11.When you come across new words in reading, it is not a good idea to in a dictionary at once. A.make up them B.look up them C.make them up D.look them up 12.---___________ is it from here to his home? ---Not far. You can arrive on foot ______________.

英语词汇学习题集

英语词汇学习题集 Chapter I A General Survey of English Vocabulary 1. Which of the following is NOT correct? _________ A. A word is a meaningful group of letters. B. A word is a unit of meaning. C. A word is a sound or combination of sounds. D. A word is a form that cannot function alone in a sentence. 3. After the invading Germanic tribes settled down in Britain, their language almost totally blotted out ______. A. Old English B. Middle English C. Anglo-Saxon D. Celtic 4. In the early period of Middle English, English, ______ existed side by side. A. Celtic and Danish B. Danish and French C. Latin and Celtic D. French and Latin 9. Both English and ______ belong to the Germanic branch of the Indo-European language family. A. Celtic B. Dansih C. French D. Scottish 12. Words can be classified according to the following criteria EXCEPT _________. A. notion B. use frequency C. foundation D. origin 7. Which of the following is NOT one of the main sources of new words?() A. The rapid development of modern science and technology. B. Geographical and political changes. C. The influence of other cultures and languages. D. Social and economic changes. 6. The major factors that promote the growth of modern English are ______. A. the growth of science and technology B. economic and political changes C. the influence of other cultures and languages D. all the above 7. Since the beginning of this century, ______ has become even more important for the expansion of English vocabulary. A. word-formation B. borrowing C. semantic change D. both B and C 9. The term "vocabulary" is used in different ways because of all the following reasons EXCEPT that ( )

大学英语四级词汇练习题及答案(7)

大学英语四级词汇练习题及答案(7) 导读:本文大学英语四级词汇练习题及答案(7),仅供参考,如果觉得很不错,欢迎点评和分享。 1.Being ignorant of the law is not accepted as an ________ for breaking the law. A) excuse B) intention C) option D) approval 2.Within two days, the army fired more than two hundred rockets and missiles at military ________ in the coastal city. A) goals B) aims C) targets D) destinations 3.It is said in some parts of the world, goats, rather than cows, serve as a vital ________ of milk. A) storage B) source C) reserve D) resource 4.“This light is too ________ for me to read by. Don’t we have a brighter bulb some where”; said the elderly man.

A) mild B) dim C) minute D) slight 5.We have arranged to go to the cinema on Friday, but we can be ________ and go another day. A) reliable B) probable C) feasible D) flexible 给大家留一点作业,建议准备参加六月份考试的同学练习一下,主要是对以往节目内容的复习. 1)翻译:________(随着失业率的上升), workers who are 50 to 60 years old are usually the first to be laid off. 2)翻译:________(被电视上的超级巨星所鼓舞) , the young athletes trained hard and played intensely. 第一题: excuse:v. 原谅,申辩,做为...的托辞;n. 致歉,理由 intention:n. 意图,目的,观念 option:n.意见,见解;主张;评价 approval:n. 赞成,承认 第二题: goal:n. 目标,终点

(完整版)思考题及习题2参考答案

第2章思考题及习题2参考答案 一、填空 1. 在AT89S51单片机中,如果采用6MHz晶振,一个机器周期为。答:2μs 2. AT89S51单片机的机器周期等于个时钟振荡周期。答:12 3. 内部RAM中,位地址为40H、88H的位,该位所在字节的字节地址分别为 和。答:28H,88H 4. 片内字节地址为2AH单元最低位的位地址是;片内字节地址为A8H单元的最低位的位地址为。答:50H,A8H 5. 若A中的内容为63H,那么,P标志位的值为。答:0 6. AT89S51单片机复位后,R4所对应的存储单元的地址为,因上电时PSW= 。这时当前的工作寄存器区是组工作寄存器区。答:04H,00H,0。 7. 内部RAM中,可作为工作寄存器区的单元地址为 H~ H。答:00H,1FH 8. 通过堆栈操作实现子程序调用时,首先要把的内容入栈,以进行断点保护。调用子程序返回指令时,再进行出栈保护,把保护的断点送回到,先弹出的是原来中的内容。答:PC, PC,PCH 9. AT89S51单片机程序存储器的寻址范围是由程序计数器PC的位数所决定的,因为AT89S51单片机的PC是16位的,因此其寻址的范围为 KB。答:64 10. AT89S51单片机复位时,P0~P3口的各引脚为电平。答:高 11. AT89S51单片机使用片外振荡器作为时钟信号时,引脚XTAL1接,引脚XTAL2的接法是。答:片外振荡器的输出信号,悬空 12. AT89S51单片机复位时,堆栈指针SP中的内容为,程序指针PC中的内容为 。答:07H,0000H 二、单选 1. 程序在运行中,当前PC的值是。 A.当前正在执行指令的前一条指令的地址 B.当前正在执行指令的地址。 C.当前正在执行指令的下一条指令的首地址 D.控制器中指令寄存器的地址。 答:C 2. 判断下列哪一种说法是正确的?

大学英语重点词汇练习题及答案

(B卷) Vocabulary(15 points) Direction:There are 30 incomplete sentences in this part .For each sentence there are four choices marked A) B) C) D) .Choose the one best completes the sentence. 1. The opening speeches sounded more like ________ of war than offering of peace. A) announce B) demand C) declaration D) demonstration 2. Their marriage was already ________ even before his wife went abroad. A) fade away B) fall apart C) get away D) go down 3. I’m pleased to hear of your job offer-----all that hard work at school has obviously ____. A) paid off B)taken its off C) made a difference D) shown up 4. A rich old lady _______ dead at home for two weeks---and nobody knew anything about it. A. lived B. stayed C. lay D. kept 5. Smart cars ________which can monitor one’s driving and the driving conditions nearby. A) have built B) have been built C) are building D) are going to build 6. Now that we’ve got a loan from the bank, our project is financially _____.

词汇学练习试题

1.________ is traditionally used for the study of the origins and history of the form and meaning of words. A. Semantics B. Linguistics C. Etymology D. Stylistics 2.Stylistics is the study of style . It is concerned with the user’s choices of linguistic elements in a particular________ for special effects A. situation B. context C. time D. place 3.Lexicography shares with lexicology the same problems: the form , meaning, origins and usages of words, but they have a _______ difference. A . spelling B. semantic C. pronunciation D. pragmatic 4. Neologisms are newly-created words or expressions, or words that have taken on ______meanings. A. new B. old C. bad D. good 5The Normans invaded England from France in 1066. The Norman Conquest started a continual flow of ______ words into English. A. French B. Greek C. Roman D. Latin 6Greek is the modern language derived from _______. A. Latin B. Hellenic C. Indian D . Germanic 7The prefixes in the words of ir resistible, non classical and a political are called _______. A.reversative prefixes B. negative prefixes C. pejorative prefixes D. locative prefixes 8The prefixes contained in the following words are called ______: pseudo-friend, mal practice, mis trust. A. reversative prefixed B. negative prefixes C. pejorative prefixes D. locative prefixes 9The prefixed contained in un wrap, de-compose and dis allow are _________. A. reversative prefixed B. negative prefixes C. pejorative prefixes D. locative prefixes 10The prefixes in words extra-strong, overweight and arch bishop are _____ . A . negative prefixes B. prefixes of degree or size C. pejorative prefixes D. locative prefixes 11The prefixes in words bi lingual ,uni form and hemis phere are ________. A. number prefixes B. prefixes of degree or size C. pejorative prefixes D. locative prefixes 12.________ are contained in words trans-world, intra-party and fore head. A.Prefixes of orientation and attitude B. Prefixes of time and order C. Locative prefixes D. Prefixes of degree or size 13. Omega,Xerox and orlon are words from _________. https://www.doczj.com/doc/3f12291392.html,s of books B. names of places C. names of people D. tradenames 14.Ex-student, fore tell and post-election contain________. A.negative prefixes B. prefixes of degree or size C. prefixes of time and order D. locative prefixes 15Mackintosh, bloomers and cherub are from _______ A. names of books B. names of places C. names of people D. tradenames 16The prefixes in words new-Nazi, autobiography and pan-European are ________. B.negative prefixes B. prefixes of degree or size C. prefixes of time and order D. miscellaneous prefixes 17The prefixes in words anti-government , pro student and contra flow are _____-. C.prefixes of degree or size B. prefixes of orientation and attitude C. prefixes of time and order D. miscellaneous prefixes 18Utopia ,odyssey and Babbit are words from ________. https://www.doczj.com/doc/3f12291392.html,s of books B. names of places C. names of people D. tradenames 19The suffixes in words clockwise, homewards are ______.

仁爱英语七年级下册词汇练习题

年级下册词汇练习题

班级: :姓名 Unit 5 Topic 1 Ⅰ. 词汇部分。(10分) (A)根据句意及首字母提示,在空白处填入适当的单词。 :30 . School is o . Let's go —41. Oh, it's 4home.—All right. Let's go. 42. —Does Jane often read books in the l ? —Sorry, I don't know. 43. Lin Dan doesn't like reading books. He always l to music. 44.—How often do you go to the park, Jane? —O a week. 45.—What time do classes b in the morning? —At eight. (B)根据句意,用括号内所给单词的适当形式填空。 46.—What does Ellen usually do after school? —She usually (watch) TV. 47.—How do (America) students usually go to school?.

—Well, they usually walk or take a yellow school bus to school. 48. Betty writes to his father (two) a week. 49. He usually goes (swim) in his free time. 50. Yu Jing sometimes (ride) a bike to school. Unit 5 单元测试 Ⅰ. 词汇部分。(10分) (A)根据句意及首字母提示,在空白处填入适当的单词。 46.—How often does Jim go to the library? —He goes to the library o a week. 47. W comes after Tuesday. 48. There is a soccer game b Class 3 and Class 4 on :30 p. m. on Friday.the playground at 4 49.—Do you like l to music? —Yes, very much. 50.—Where is John now? —He is w a letter in the classroom. (B)根据句意,用方框中所给单词的适当形式填空。 alsoJapan, around, study, over,

思考题与习题答案

思考题与习题 1 1- 1 回答以下问题: ( 1)半导体材料具有哪些主要特性? (2) 分析杂质半导体中多数载流子和少数载流子的来源; (3) P 型半导体中空穴的数量远多于自由电子, N 型半 导体中自由电子的数量远多于空穴, 为什么它们对外却都呈电中性? (4) 已知温度为15C 时,PN 结的反向饱和电流 I s 10 A 。当温度为35 C 时,该PN 结 的反向饱和 电流I s 大约为多大? ( 5)试比较二极管在 Q 点处直流电阻和交流电阻的大小。 解: ( 1)半导体的导电能力会随着温度、光照的变化或掺入杂质浓度的多少而发生显着改变, 即半导体具 有热敏特性、光敏特性和掺杂特性。 ( 2)杂质半导体中的多数载流子是由杂质原子提供的,例如 供一个自由电子,P 型半导体中一个杂质原子提供一个空穴, 浓度;少数载流子则是由热激发产生的。 (3) 尽管P 型半导体中空穴浓度远大于自由电子浓度,但 P 型半导体中,掺杂的杂质原子因获得一个价电子而变成带负电的杂 质离子(但不能移动),价 电子离开后的空位变成了空穴,两者的电量相互抵消,杂质半导体从总体上来说仍是电中性的。 同理, N 型半导体中虽然自由电子浓度远大于空穴浓度,但 N 型半导体也是电中性的。 (4) 由于温度每升高10 C ,PN 结的反向饱和电流约增大 1倍,因此温度为 35C 时,反向 饱和电流为 (5) 二极管在 Q 点处的直流电阻为 交流电阻为 式中U D 为二极管两端的直流电压, U D U on ,I D 为二极管上流过的直流电流, U T 为温度的 电压当量,常温下 U T 26mV ,可见 r d R D 。 1- 2 理想二极管组成的电路如题 1- 2图所示。试判断图中二极管是导通还是截止,并确定 各电路的输 出电压。 解 理想二极管导通时的正向压降为零, 截止时的反向电流为零。 本题应首先判断二极管的工 作状 态,再进一步求解输出电压。二极管工作状态的一般判断方法是:断开二极管, 求解其端口 电压;若该电压使二极管正偏, 则导通; 若反偏, 则截止。 当电路中有两只或两只以上二极管时, 可分别应用该方法判断每只二极管的工作状态。 需要注意的是, 当多只二极管的阳极相连 (共阳 极接法)时,阴极电位最低的管子将优先导通;同理,当多只二极管的阴极相连(共阴极接法) 时,阳极电位最高的管子将优先导通。 (a) 断开二极管 D ,阳极电位为12V ,阴极电位为6V ,故导通。输岀电压 U O 12V 。 (b) 断开二极管 D 1、D 2, D 1、D 2为共阴极接法,其阴极电位均为 6V ,而D 1的阳极电位 为9V , D 2的阳极电位为5V ,故D 1优先导通,将 D 2的阴极电位钳制在 7.5V ,D 2因反向偏置而 截止。输岀电压 U O 7.5V 。 N 型半导体中一个杂质原子提 因此 多子浓度约等于所掺入的杂质 P 型半导体本身不带电。因为在

考研英语词汇练习题及答案(一)

考研英语词汇练习题及答案(一) 1. This rock has to be _______ in order to build a road. A. blasted B.explored C.hired D.maintained 2. He did not go to the party last night, which _______ her feelings deeply. A. wounded B.injured C.hurt D.injury 3.When they returned to the river, they found that the boat had _______ away. A.framed B.frosted C.frowned D.floated 4.If you need further information, please _______ our office. A.constant B.construct C.contact D.contain 5.During the war, many soldiers were killed not by _______, but by disease. A.bulledts B.devil C.bible D.depth 6.We watched the ship until it became only a _______ in the distance. A. point B.jar C.stove D.dot 7.The English proverb ‘_______ the rod and spoil the child’means that if you deep from punishing the child, you will spoil its character. A. rule B.rug C.clap D.spare 8.The _______ was only sentenced to pay a fine of $10,000. A. worm B.trial C.tube D.criminal 9.Higher education in China is free but the _______ for entrance is strong. A. comparison B.consequence https://www.doczj.com/doc/3f12291392.html,petition D.crawl 10.The light is too _______ for me to read. I can not stand any more. A. rid B.ripe C.soup D.dim 11.The water _______ from the tap and damaged all the books in my study. A. sprayed B.puzzled C.inclined D.exported 12.In the United States, Congress makes the laws and the President _______ them. A. orders B.conquers C.executes D.hedges 13.She is too _______ to answer questions in the class. A. eagle B.cough C.eager D.couch 14.We enjoy seeing the glorious _______ of the rising sun. A. beams B.beans C.beef D.beer 15.In the _______ English reading course, the students have to read a lot. A. extensive B.mechanical C.mercury D.opera 16.He gave up his study in college in _______. A. bundle B.butcher C.ash D.despair 17.Several people _______ the car accident. A. witnessed B.proved C.swallowed D.drugged 18.They will _______ the project with the necessary funds. A. refer B.relate C.furnace D.furnish 19.I took it for _______ that you wouldn’t come here again. A. grand B.tame C.granted D.thumb 20.He was sent to London on a special _______. A. missing B.missile C.mission D.mistress

Lexicology词汇学练习题目和答案

Mid-term Exam 1.Please illustrate the logical relationships of the following terms: free morphemes, bound root, derivational affixes, affixes, morphemes, inflectional affixes, bound morphemes. Free ----free root Bound root Morpheme Bound inflectional affixes prefixes Derivational affixes suffixes 2.Prefixation and suffixation are two subclasses of affixation. Please define prefixation and suffixation and explain the difference between them. Use ―polite—impolite‖, ―happy—happiness‖ to illustrate your point. Prefixation is the formation on new words by adding a prefix or combining form to the base, and usually change the meaning of the base. Suffixation is the formation of new words by adding a suffix or a combining form to the base, and usually changing the word-class of the base. Im- is a negative prefix, polite, by adding a suffix im- , changes into the negative side impolite. However, happy is a adjective, and it is changed into a noun by adding suffix –ness without changing its basic meaning. 3. Comment on the following groups of words to illustrate types of meaning of words and their relationship. Group 1: ―took, taught, became‖ Group 2: ―have, has, had, had, having‖ There are two main types of meaning that are grammatical and lexical. Grammatical meaning consists of word-class and inflectional paradigm. Group 1 is the same in grammatical meaning: ―took , taught, became‖, they have different lexical meaning, but they are in the same word-forms of the past-tense meaning. However, group 2 has the same lexical meaning, while they are different in the tense, that is to say in different grammatical meaning. 4. Analyze and comment on three adjectives used in the following sentences based on synonym difference in connotation. [A] Look at that little boy. [B] Look at that small boy. [C] Look at that tiny boy

现代汉语词汇部分练习题七

1 / 18 现代汉语词汇部分练习题七 本人精心整理的文档,文档来自络本人仅收藏整理 如有错误 还请自己查证! 现代汉语词汇部分练习题 一、填空 1、从分布位置看语素可分为______和______ 2、xx是指由 _______构成的词 3、合成词是指由_______构成的词 4、词根是词中表示_______、位置______的语素 5、词缀是在词中表示______、位置_____的语素 6、词汇是语言里____和____的总汇 7、语素是_____结合体 8、词是表示_____、_____的最小语言单位 9、从语音构成角度来看 语素可分为??????_____和______ 10、从语法功能看 语素可分为______和______ 11、双音节单纯词可分为______、____和_____、_____四种 12、附加式合成词分为_______和____两种 13、复合式的合成词有______、_____、_____、____、___五种结构类型

2 / 18 14、简称常见的简缩方式有三种: (1)_____ (2)_____ (3)____ 15、词义是___________反映 它包含着人们_______ 16、词义具有_____、______、_____三种性质 17、本义就是_____意义 18、基本xx是_____的意xx 19、引申义是_____的意义 20、比喻xx是_____的意xx 21、词义的发展变化主要有____、_____、____三种方式____的词叫单义词 22、xx是指_____的词 23、同音词是指_____而____的词 24、同音词可分为两类: ______和________ 25、同音异形词产生的原因主要有两条: (1)______ (2)______ 26、一般区分xx和同音词的原则是: 3 / 18 ____的是多义词______的是同音词 27、同义词是____的一组词 28、反义词的对应关系主要有三种类型: (1)____-(2)___ (3)_____

相关主题
文本预览
相关文档 最新文档