Chapter 1
P18
Suppose two hosts, A and B, are separated by 10,000 kilometers and are connected by a direct link of R =2 Mbps. Suppose the propagation speed over the link is 2.5*108 meters/sec.
a)d prop=m
s
=0.04(s) R?d prop=8.0×104(b)
b) N= R?d prop=8.0×104(b)
c) The bandwidth-delay product of a link is the maximum number of bits that can be in the link
d) w=m
N
=125(m/b)，1 bit is 125 meters long, which is longer than a football field
e) w=m
N =m
R?d prop
=m
R?m
s
=s
R
P19
Referring to problem P18, suppose we can modify R. For what value of R is the width of a bit as long as the length of the link?
依题意，w=m=1.0×107(m)，又w=s
R
所以，R=s
w
=25(bps)
P20
Consider problem P18 but now with a link of R=1Gbps.
a) R?d prop=4.0×107(b)
b) N=4.0×107>4.0×105∴N max=4.0×105
c) w=m
N
=0.25(m/b)
P21
Refer again to problem P18. a) T a = t trans + t prop =
4.0×105R
+m
s =0.2+0.04=0.24(s)
b) T b =10×(t trans +2 t prop )=1(s) c) T a In modern packet-switched networks, the source host segments long, application-layer messages into smaller packets and sends the packets into the network. The receiver then reassembles the packets back into original message.We refer to this process as message segmentation. a) Time to send message from source host to first packet switch =6 6 8.010sec 4sec 210?=?. With store-and-forward switching, the total time to move message from source host to destination host =4sec 312sec hops ?= b) T=2000 2×106=0.001(s)=1ms Time at which 2nd packet is received at the first switch = time at which 1st packet is received at the second switch = sec 2sec 12m m =? c) time at which last (4000th) packet is received=3s 3999*1s 4.002s m m +=. It can be seen that delay in using message segmentation is significantly less (almost 1/3rd). d) Drawbacks: i. Packets have to be put in sequence at the destination. ii. Message segmentation results in many smaller packets. Since header size is usually the same for all packets regardless of their size, with message segmentation the total amount of header bytes is more. P26 Consider sending a large file of F bits for Host A to Host B. There are two links between A and B, and the links are uncongested. Host A segments the file into segments of S bits each and adds 40 bits of header to each segment, forming packets of L=40+S bits. Each link has a transmission rate of R bps. Find the value of S that minimizes the delay of moving the file from Host A to Host B. Disregard propagation dealy. Time at which the 1st packet is received at the destination ：T=S+40R ×2(s)，After this, one packet is received at destination every S+40R sec T 总 = S+40R ×2+(F S ?1)( S+40R )= (F S +1)( S+40R ) To calculate the value of S which leads to the minimum delay ， T 总 ′=021401 ()0F S S R S S R +? -+=?= Chapter 2 P7 The total amount of time to get the IP address is n RTT RTT RTT +++Λ21. Once the IP address is known, O RTT elapses to set up the TCP connection and another O RTT elapses to request and receive the small object. The total response time is T=n o RTT RTT RTT RTT ++++Λ212 P8 a) Non-persistent HTTP with no parallel TCP connections: T a =T+3?2RTT 0 b) Non-persistent HTTP with parallel TCP connections: T b =T+2RTT 0 c) Persistent HTTP: T c =T+RTT 0 P9 a)?= 9×1051.5×107 =0.06(s)，β=10，?β=0.6 ?/(1-?β)=0.15(s) T total =2+0.15=2.15(s) b) the average access delay is ?/(1-0.6?β) =(0.06 sec)/[1 – (0.6)(0.6)] = 0.09375 seconds. the average response time is0 .12 sec +2 sec =2.09375 sec for cache misses the average response time is (0.4)(0 sec) + (0.6)(2.09375 sec) =1.25625 seconds. Thus the average response time is reduced from 2.6 sec to 1.25625sec. P16 F = 5Gbits = 5 * 1024 Mbits u s = 20 Mbps d min = d i= 1 Mbps Client-Server Peer to Peer )}u , NF/(u , F/d max{F/u D N 1i i s min s P P ∑=+=2 P19 There are N nodes in the overlay network. There are N(N-1)/2 edges. P21 Alice sends her query to at most N neighbors. Each of these neighbors forwards the query to at most M = N-1 neighbors. Each of those neighbors forwards the query to at most M neighbors. Thus the maximum number of query messages is N + NM + NM 2 + … + NM (K-1) = N(1 + M + M 2 + … + M (K-1) ) = N(1-M K )/(1-M) = N[(N-1)K - 1]/(N-2) P23 In this problem we explore designing a hierarchical overlay that has ordinary peers, super peers, and super-duper peers. a) 100×400=4×1044×106 =100 4×104 Therefore, we would need about 100 super-duper peers to support 4 million nodes. b) Each super peer might store the meta-data for all of the files its children are sharing. A super-duper peer might store all of the meta-data that its super-peer children store. An ordinary node would first send a query to its super peer. The super peer would respond with matches and then possibly forward the message to its super-duper peer. The super-duper peer would respond (through the overlay network) with its matches. The super-duper peer may further forward the query to other super-duper peers. P24 With the original line, UDPClient does not specify a port number when it creates the socket. In this case, the code lets the underlying operating system choose a port number. With the replacement line, when UDPClient is executed, a UDP socket is created with port number 5432 . UDPServer needs to know the client port number so that it can send packets back to the correct client socket. Glancing at UDPServer, we see that the client port number is not “hard-wired” into the server code; instead, UDPServer determines the client port number by unraveling the datagram it receives from the client (using the .getPort() method). Thus UDP server will work with any client port number, including 5432. UDPServer therefore does not need to be modified. Before: Client socket = x (chosen by OS) Server socket = 9876 After: Client socket = 5432 Chapter 3 P1 e) Yes. f) No. P3 01101010 + 01001111 10111001 10111001 01110011 + 100101100 One's complement = 1 0 0 1 0 1 1 0 0 To detect errors, the receiver adds the four words (the three original words and the checksum). If the sum contains a zero, the receiver knows there has been an error. All one-bit errors will be detected, but two-bit errors can be undetected (e.g., if the last digit of the first word is converted to a 0 and the last digit of the second word is converted to a 1). P14 0.8=(0.008n)/30.016 n=3002 P23 There are 2964,294,967,232= possible sequence numbers. a) 2964,294,967,232= G bytes 4.19232≈ b) n=758,941,21460232=? ? ????,66n=194,156,028 总=73210591,3028,156,1942?=+ 总/(100×106)=359.1(s) P24 a.In the second segment from Host A to B, the sequence number is 409, source port number is 1028 and destination port number is 80. b.If the first segment arrives before the second, in the acknowledgement of the first arriving segment, the acknowledgement number is 409, the source port number is 80 and the destination port number is 1028. c.If the second segment arrives before the first segment, in the acknowledgement of the first arriving segment, the acknowledgement number is 359, indicating that it is still waiting for bytes 359 and onwards. d. Host A Host B Timeout interval Timeout interval P28 a ）Denote )(n TT EstimatedR for the estimate after the n th sample. 1)1(SampleRTT TT EstimatedR = 21)2()1(SampleRTT x xSampleRTT TT EstimatedR -+= 1)3(xSampleRTT TT EstimatedR = ])1()[1(32SampleRTT x xSampleRTT x -+-+ 21)1(xSampleRTT x xSampleRTT -+= 32)1(SampleRTT x -+ )3(1)4()1(TT EstimatedR x xSampleRTT TT EstimatedR -+= 21)1(xSampleRTT x xSampleRTT -+= 4332)1()1(SampleRTT x xSampleRTT x -+-+ b) j n j j n SampleRTT x x TT EstimatedR ∑-=-=1 1 ) ()1( n n SampleRTT x )1(-+ c)x=0.16 ∑∞=∞--=1 ) ()1(1j j j SampleRTT x x x TT EstimatedR 1 40.8421j j j SampleRTT ∞ ==∑ The weight given to past samples decays exponentially. P34 a)TCP slowstart is operating in the intervals [1,6] and [23,26] b)TCP congestion advoidance is operating in the intervals [6,16] and [17,22] c)After the 16th transmission round, packet loss is recognized by a triple duplicate ACK. If there was a timeout, the congestion window size would have dropped to 1. d)After the 22nd transmission round, segment loss is detected due to timeout, and hence the congestion window size is set to 1. e)The threshold is initially 32, since it is at this window size that slowtart stops and congestion avoidance begins. f)The threshold is set to half the value of the congestion window when packet loss is detected. When loss is detected during transmission round 16, the congestion windows size is 42. Hence the threshold is 21 during the 18th transmission round. g)The threshold is set to half the value of the congestion window when packet loss is detected. When loss is detected during transmission round 22, the congestion windows size is 26. Hence the threshold is 13 during the 24th transmission round. h)During the 1st transmission round, packet 1 is sent; packet 2-3 are sent in the 2nd transmission round; packets 4-7 are sent in the 3rd transmission round; packets 8-15 are sent in the 4th transmission round; packets15-31 are sent in the 5th transmission round; packets 32-63 are sent in the 6th transmission round; packets 64 – 96 are sent in the 7th transmission round. Thus packet 70 is sent in the 7th transmission round. i)The congestion window and threshold will be set to half the current value of the congestion window (8) when the loss occurred. Thus the new values of the threshold and window will be 4. 计算机专业英语复习题标准化管理处编码[BBX968T-XBB8968-NNJ668-MM9N] 1.home page 主页 2.graphical user interface (GUI) 图形用户界面 3.artificial intelligence 人工智能 4.carbon copy 打字副本 5.field 字段 6.software suite 软件套装 7.desktop operating system 桌面操作系统 https://www.doczj.com/doc/e26492536.html,ser printer 激光打印机 9.machine language 机器语言 10.relational database 关系数据库 11.menu bar 菜单栏 12.secondary storage 辅助存储器；二级存储器 13.system software 系统软件 二、 1.内存 memory 2.输入设备 input device 3.扬声器 speaker 4.局域网 local-area network 5.传输控制协议 transmission control protocol 6.集成电路 integrated circuits 7.上下文敏感 context sensitive 8.微处理器 microprocessor 9.只读存储器 Read-only memory 10.触摸屏 touch screen 11.像素 pixel 12.多媒体 multimedia 13.自动换行 word wrap 三 _________. A、people B、OS C、keyboards D、procedures E、software ( abc ) 2、For microcomputer, there are three basic system units: ____________ . A、Desktop system units B、Notebook system units C、Personal digital assistant system units D、Arithmetic-logic units ( a ) 3、Language translators convert programming statements into__________. A、machine languages B、UNIX C、service programs D、operating systems ( b ) 4、The ____________is a list of commands or options from which you can choose. A、icon B、menu C、window D、pointer ( a ) 5、Database management systems are comprised of tables that are made of rows called __________ and columns called __________ . A、fields, records B、ranges, sheets C、records, fields D、 records, ranges ( abcd )6、The four main computer operations are _________. 计算机专业英语第4次作业 1.Windows gives you more control over the__A___ your work. A：operation B：way C：energy D：power 2.Tea or coffee ? Which is your___A___? A：preference B：confusion C：puzzle D：mixture 3.Programs that can destroy another computer's programs are called__D_. A：games B：computer languages C：bugs D：viruses 4.You were _C___ to us by our associates. A：told B：suggest C：recommended D：informed 5.You should be able to tell the meaning of this word from its ___C____. A：company B：conclusion C：context D：communication 6.___B___ refers to the parts of the computer that you can see and touch. A：Software B：Hardware C：Hardship D：Instruction 7.___C______that, I could do it much better. A：If I do B：If I were do C：Were I to do D：Were I do 8.A network is a group of computers linked by communication lines . 正确 9.Most RAM is temporary, losing its contents when the computer's power is turned off. 正确 10.A program is a series of instruction that guides a computer through a process. 正确 11.写出下列术语的英文或中文意思。 1 message encryption 参考答案： 1 信息加密（术） 2 客户机-服务器结构 2 client-server architecture 3 关系数据库 3 relational database 4 microwave radio 4 微波无线电 5 digital television 5 数字电视 12：[论述题]12.阅读下列短文，从A、B、C、D四个选项中，选出最佳选项。 For every man in the Civil War who died in battle, two or three men died of disease. Doctors of that time knew very little about causes of sickness or ways of preventing it. Thousands of men in poor health became soldiers. Hundreds of others had never had childhood diseases. Many of these soldiers could not withstand the epidemics of measles, mumps, and whooping cough that went through the camps. Army life was hard. Soldiers got few fruits or vegetables. There was no milk unless they happened to find a cow. Neither their clothes nor their shelters protected the troops from rain, snow, and cold. Sickness and disease were spread by insects, rats, and impure drinking water. Often the men drank straight from muddy streams. Gunshot wounds were serious, as in any war, 第五单元 Directions: In this section you'll hear some short conversations. Listen carefully and choose the best answer to the questions you hear. 1. A. She is upset with her daughter's school. B. She has nothing for her to do where she is. C. She is starting her own company. D. She has a new job. 2. A. He's too lazy. B. It's summertime. C. He can't see them. D. They look good. 3. A. She didn't want to answer while relaxing. B. She didn't notice that it was ringing. C. She didn't want to leave her bath. D. She was asleep at that time. 4. A. The man wants to marry the woman. B. The woman wants to marry the man. C. The man and woman are married. D. The man's mother wants the two to marry. 5. A. The woman is cleaning the home. B. The man is inviting the woman to stay. C. The man and woman live together. D. The man doesn't want the woman to move. 6. A. On the street. B. In the woman's home. C. With his mother. D. In his own place. 7. A. The man has a title he fought for. B. The man only had a couple of days to train. C. The man is a boxer with an upcoming fight. D. The man has trouble when he trains for fights. 8. A. The woman is talking on her mobile phone. B. The woman wants to bring home some milk. C. The man has picked up some bread. 2014年上半学期计算机专业英语 期末考试试卷（A卷）答案 一、选择题 Ⅰ. Vocabulary(词汇)(30分) (一)．Translate the following words and expressions into Chinese(写出下列词组的汉语。)( 共10分，每题1分) 1. 操作系统 2. 需求分析 3. 网络安全 4. 数据结构 5. 决策支持系统 6. 关系数据库 7. 软件危机 8. 计算机病毒 9. 邮件附件 10．中央处理器（单元） (二)．Fill in the blanks with the corresponding English abbreviatio ns.(根据汉语写出相应的英语缩写。) (共10分，每题1分) 1．DBMS 2．TCP 3．MDI 4．OOP 5．ROM 6．VCD 7．CAD 8．SQL 9．USB 10．B2B （三） Match the following words and expressions in the left column with those similar in meaning in the right column.(将左列的词汇与右列相应的汉语匹配。)(10分，每空1分) 1． c 6. h 2． f 7．j 3． e 8. d 4．g 9. i 5． a 1 0. b Ⅱ. Comprehension(阅读理解) （一） Fill in the blanks with suitable words or expressions from the lis t given below, and change the form where necessary. （从下面方框中选择合适的词或表达，以其适当的形式填空。）(10分, 每空2分) maintain disciplined requirements coding modified （二） Tell whether the following statements are true(T) or false(F) accord ing to the passage A.（根据上文的内容判断下列句子的正误）（10分,每题2分）1．F 2．T 3．F 4．T 5．F (三)、choose the best answer according to the passage B.(根据上文的内容选择正确的答案。（10分，每题2分） 1．B 2．A 3．D 4．B 5．C (四) Choose the best answer according to Passage C.（根据上文的内容选择正确的答案。10分，每题2分） 1．C 2. D 3. A 4. C 5. B Ⅲ.Translation.翻译(30分) (一) Translate the following sentences into Chinese.（将下列句子翻译成汉语。）（共20分，每题5分） 1.判断题 （）1. Operating system first appeared during the third computer generation. （）2. Unlike the other buses, the address bus always receives data from the CPU; the CPU never reads the address bus. （）3. The main operations of set algebra are complementation, union and intersection. （）4. If an empty stack is popped, we say the stack overflows, which is normally an error. （）5. The CPU can be shared in a sequential manner only. （）6. Freeware is free software with no restriction. （）7. When writing data to memory, the CPU first outputs the data onto the data bus, then outputs the address onto the address bus. （）8．The FORTRAN programming language was developed during the first computer generation. （）9．A stack is a dynamic set that obeys the FIFO property. （）10．Two popular strategies for resource allocation are static allocation and dynamic allocation. （）11．The CPU can be shared in a sequential manner only. （）12. A program written in the assembly language of one microprocessor can run on a computer that has a different microprocessor. （）13. Object-oriented programming(OOP) is a programming language model organized around “objects” rather than “actions” and data rather than logic. （）14. FORTRAN is a particularly good language for processing numerical data, but it does not lend itself very well to organizing large programs. （）15. C++ and Smalltalk are two of the more popular object-oriented programming language. 2.词汇 Vacuum tube 真空管general purpose 通用transistor 晶体管 ：大规模集成电路）Large Scale Integrated Circuit（LSI． VLSI(Very Large Scale Integrated Circuit）：超大规模集成电路 Mainframe 大型机medium-sized computer 中型机minicomputer 小型机 Microcomputer 小型机 machine language 机器语言assembly language 汇编语言high-level language 高级语言Multiprogramming 多道程序设计virtual memory 虚拟存储time-share 分时 Batch system 批处理系统interactive system 交互式系统 Instruction cycle 指令周期 Address bus, data bus, control bus Internal register内部寄存器external register 外部寄存器flag register标志寄存器 Instruction register 指令寄存器program counter程序计数器combinatorial logic组合逻辑Control signal 控制信号instruction code指令代码instruction pipeline指令流水线Bidirectional 双向的unidirectional 单向的 ALU(Arithmetic Logic Unit) 算术逻辑单元 计算机专业英语作业答案（供参考） 计算机专业英语作业1 第1－3章作业一．( 词汇) (一)．(写出下列词组的汉语。) 1．（）中央处理器 2 标题栏 3．操作系统4．个人计算机 5．菜单栏6．桌面排版 7．电子表格8．硬盘 9．数据库10．光标 (二)．.(根据汉语写出相应的英语缩写。) 1．随机存储器2．只读存储器 3．传输控制协议P 4．数字视频光盘5．通用串行总线6．计算机辅助设计7．计算机辅助制造8．中央处理器 (三)．.(根据汉语写出相应的英语。) 1．键盘2．鼠标3．扫描仪 4．打印机5．输入6．输出 7．显示器8．存储器9．数据库 10．操作系统11．应用软件 12．字处理器13．网络浏览器 二．(T) (F).(判断正误。) 1．, . (√) 2．'s . (√) 3．: . (√) 4． a 2000 . (×) 5．( ) a . (√) 6. , a . (√) 7. , ’s . (×) 8. ’t . (×) 9. . (×) 10. . (×). 三．.(将左列的词汇与右列相应的汉语匹配。) （一）． 1. （） a. 操作系统 2. b. 输入. 3. ( ) c. 只读存储器 4. ( ) d. 应用软件 5. e. 中央处理器 6. f. 系统软件 7. g. 硬件 8. h. 随机存储器 9. i. 内存 10. j. 输出 1．e 6. j 2．g 7．a 3．h 8. d 4．c 9. f 5．b 10. i (二) ． 1. a 2. b a 3. c 4 d a 0 1 5. e a 6. f 7. g 8. h a 9. i a 1．d 6. a 2．g 7．f 3．h 8. c 4．b 9. e 5．i 四．, . （从下面方框中选择合适的词或表达，以其适当的形式填空。） 1． () . , a . , . , , . , . 2. , , . , a a a , a , a , a . , , . a , , a . , 1-2-3 . a , a ( ) . 3. 《大学英语》试卷及答案 学号：姓名：专业层次: 分数： 一．单项选择题（本大题共15小题，每小题2分，共30分） 1. The Business Banking Department is on_____C_______second floor. A. / B. a C. the 2. Maria often has a walk with______C______parents in the morning. A. she B. their C. her 3. There_____B_______four children in the picture. A. is B. are C. have 4. I’d like______A______oranges, please. A. some B. any C. / 5. ______B______does the flat cost a month? A. How many B. How much C. How about 6. I’m bad at spelling, but Jane is_____B_______than me. A. bad B. worse C. less 7. He______B______in Beijing, but his parents____________in Hangzhou. A. live, lives B. lives, live C. live, live 8. - I’m enjoying the long summer evenings. -____A________am I. A. So B. Neither C. Nor 9. I usually get up_____A_______7 o’clock in the moring. A. at B. in C. on 10. It often______B______in winter in the north of China. A. snow B. snows C. is snowing 11. —The second bedroom isn’t big enough. —Yes, I agree. It is______B______. A. small B. too small C. enough small 12. This is his book. Could you give it_____A_______him？ A. to B. with C. for 13. I’m interested _____A_______cooking. A. in B. to C. at 14. I’d like to_______B_____you to a party this Saturday. A. join B. invite C. leave 15. When_______A_____for London? A. is she flying B. she flies C. she is going to fly 二．阅读理解（本大题共15小题，每小题2分，共30分） 少工学结合创新教程....................... 计算机专业英语 2014年上半学期计算机专业英语 期末考试试卷（A卷）答案 一、选择题 I . Vocabulary（词汇）（30 分） （一）.Tran slate the follow ing words and expressi ons into Chin ese（ 汉语。）（共10分，每题1分） 1. 操作系统 2. 需求分析 3. 网络安全 4. 数据结构 5. 决策支持系统 6. 关系数据库 7. 软件危机 8. 计算机病毒 9. 邮件附件 10. 中央处理器（单元） （二）.Fill in the blanks with the corresponding English abbreviations.（ 写出相应的英语缩写。）（共10分，每题1分） 1 . DBMS 2. TCP 3. MDI 4. OOP 5. ROM 6. VCD 7 . CAD 8 . SQL 9 . USB 10. B2B （三） Match the following words and expressions in the left column with those similar in mea ning in the right colum n.（将左列的词汇与右列相应的汉语匹配。写出下列词组的 根据汉语）（10分，每空 1分） 1. c 6. h 1. 开发一个软件产品，开发过程分为五个步骤：需求分析和说明，设计，写代码，测试和维护。 2. 功能测试检验的是用有效的输入是否能够得到所期望的输出。+ 3. EDI指的是两个公司之间通过私有网络使用特定、结构化的格式电子交换商业信息。 4. 一些应用软件，例如Word,允许几个窗口同时在一个叫做MDI的模式下存在，你能够在 一个软件中打开多个文档。 （二）Tran slate the follow ing paragraph into Chi nese. （将下段文章翻译成汉语。）（共10分） 高级语言是一种人造语言，使用它我们可以写不同的指令。这成为可能不是因为计算机处理器如今是如此的技术先进以至于它们可以理解这些语言。你需要将这些语言翻译成计算机处理器能够理解的机器语言。编译器能够完成这项工作。这就意味着高级语言程序不是直接可项目1 3. e 8. d 4. g 9. i 5. a 10. b n . Comprehension（阅读理解） （一） Fill in the bla nks with suitable words or expressi ons from the list give n below ,and change the form where necessary. （从下面方框中选择合适的词或表达，以其适 当的形式填空。）（10分，每空2分） maintain discipli ned requireme nts codi ng modified （二）项目2 项目3 Tell whether the follow ing stateme nts are true（T） or false（F） accord ing to the passage A.（根据上文的内容判断下列句子的正误）（10分，每题2分）项目4 1 . F 2 . T 3 . F 4 . T 5 . F （三）、choose the best answer according to the passage B.（确的答案。（10分，每题2分） 1 . B 2 . A 3 . D 4 . B 5 . C （四）Choose the best answer according to Passage C. 案。10分，每题2分） 1 . C 根据上文的内容选择正 （根据上文的内容选择正确的答 项目5 2. D 3. A 项目6 4. C 5. B 川.Translation. 翻译（30 分） （一）Tran slate the followi ng senten ces in to Chin ese. 20分，每题5分）（将下列句子翻译成汉 语。 ） （共 项目7 项目8 项目9 项目10 计算机英语试题 一、词汇（选择一个最合适的词汇，将对应的英文字母填入空格内。每题1分，共10分） 1、____ refers to the parts of the computer that you can see and touch. A. Software B. Hardware C. Hardship D. Instruction 2、primary memory which is stored on chips located ____. A. on the motherboard B. outside C. inside the processor D. on the CPU 3、The display screen is the most common ____ device used to show you what the computer is doing. A. input B. printing C. output D. electronic 4、Windows gives you more control over the ____ you work. A. operation B. way C. energy D. power 5、The most important program on any computer is ____. A. Operating System B. Virus C. software D. Office 2000 6、There are ____ separate products that form the Windows 2000。 A. only one B. two C. three D. four 7、C might best be ____ as a 'medium-level language'. A. developed B. decoded C. programmed D. described 8、Anti-Virus protects your computer from viruses by ____ your computer's memory and disk devices. A. deleting B. changing C. scanning D. replacing 9、Multimedia will become increasingly ____ throughout every aspect of our lives. A. pass B. precise C. permit D. pervasive 10、Communication through the Internet, the____ performs the reverse function. A. A station controller (STACO) B. DTE C. Data communications equipment (DCE) D. CRT 一、词汇（选择一个最合适的词汇，将对应的英文字母填入空格内。每题2分，共20分） 1、A is used to communicate with another computer over telephone lines. A. keyboard B. modem C. mouse D. printer 2、A is a device that enables the computer to handle sounds. A. network card B. video card C. sound card D. monitor 3、is a word processing tool that helps you to create quality documents. A. Word 2000 B. Outlook 2000 C. Access 2000 D. Excel 2000 4、is a fast and powerful operating system, based on the UNIX O.S. A. Windows 2000 B. Office 2000 C. Windows 98 D. Linux 5、The OSI model has layers. A. four B. five C. six D. seven 6、The purpose of the is to provide fully integrated analog services to users. 1 计算机专业英语作业(1 一、Translate the following sentences into English or Chinese. 1.计算机 2.多媒体 3.硬件 4.软件 5.输入设备 6.存储器 7.外部设备8.处理器 9.鼠标10.语音识别 11.扫描仪12.寄存器 13.Arithmetic and logic unit 14.Binary form 15.Control unit 16.Instruction cycle 17.Execution cycle 18.Central processing unit 19.Universal serial bus 20.Universal parallel bus 二、For each of the following blanks, four choices are given. Choose the most appropriate one. 1.A personal computer keyboard includes . a.a typewriter layout and a set of arrow keys b.a numeric keypad C.a Set of function keys d.a11 of above 2.A display is a device that is used to display . a.numbers letters b.special characters c. graphic information d.all of above 3.system software includes and . a.operating system and application software b.operating system and programming language c.special—purpose programs and application software d.OS and special—purpose programs https://www.doczj.com/doc/e26492536.html,rmation flows from a computer into a peripheral device as . a.output b.memory c.a program d.input 5.programs are known collectively as . 模拟题四 第一部分：交际用语 此部分共有5个未完成的对话，针对每个对话是未完成的部分有4个选项，请从A、B、C、D四个选项中选出可以填入空白处的最佳选项，并用铅笔将答题卡上的相应字母涂黑。 1. ---Do you mind if I sit here? --- _____A_________. A. Not at all. There is plenty of room. B. Of course. Do sit down, please. C. Never mind. I’d like to have some companion. D. Sure. I’d like to have someone to talk to 2. –Why do you always tell me what to do? To be frank, I don’t like it. --- I know, but _C__. A. I don’t like it either. B. How do I do for you? C. I just want the best for you. D. Obviously. You are right. 3. ----That was a delicious dinner. ----_D_. A. Thank you. Don’t mention it. B. You’re welcome. C. Not so delicious, I’m afraid. D. I’m glad you enjoyed it. 4. --- You are most beautiful in that red sweater. --- __C___. A. Oh, no. It’s just an old one, and I have had it for years. B. Yes. I think it goes nicely with my pants. C. Thank you. My mom knitted it for me some years ago. D. Oh, but I’m not sure if it suits me. 5. ---I missed Prof. Wang’s linguistics class again yesterday. ----_____C_____. A. Congratulations! B. How nice you are! C. What a pity! D. Have a nice weekend. 第二部分：阅读理解 此部分共有2篇短文，每篇短文后有5个问题。请从每个问题后的A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并用铅笔将答题卡上的相应字母涂黑。 Passage 1 Many countries face a somewhat more serious economic problem in the form of an unfavorable trade balance with other nations. Such an imbalance exists when the total value of a country’s imports exceeds that of its exports. For example, if a country buys $25 billion of products from other countries, yet sells only $10 计算机英语期末考试试题 I. 单选题. (1*20) 1.A computer system includes both _________ and software. A.cable B.memories C.CPU D.hardware 2.The heart of the computer is _________ A.CPU B.BUS C.CAI D.DIV 3.Which is not input device used with microcomputers ? A.Keyboard B.Printer C.touch screen D.Mouse 4.Basically , a computer consists of four components : Central Processing Unit , _________, Input Device and Output Device. A.Memory B.Keyboard C.Monitor D.The Control Unit 5.A _________ is a small , hand-held object that is pushed around a desktop to move the cursor or pointer on the screen or to select choices from menu displayed on screen. A.keyboard B.mouse C.monitor D.printer 6.Which is "删除" in Chinese ? A.shift B.Control C.Insert D.Delete 7.__________ refers to the parts of the computer that you can see and touch. A. Software B. Hardware C. Hardship D. Instruction 8._________ is used to communicate with another computer over telephone lines A. keyboard B .modem C. printer D. Mouse 9.__________is a device that enables the computer to handle sounds. A. network card B. video card C. sound card D. Monitor 10. The display screen is the most common device used to show you what the computer is doing. A. input B. printing C. output D. electronic 11._________ is a word processing tool that helps you to create quality documents. A. Word 2003 B. Outlook 2003 C. Access 2003 D. Excel 2003 12.The first generation of computer lasted from _________ to 1958. A.1965 B.1946 C.1947 D.1970 13._________ is the application of the computer and communications technology to improve the productivity of office workers. A.CAI B.AI C.OA D.CAM 14._________ is a software system based on graphics, which can run under MS-DOS. A.Office B.Mouse C.OS D.Microsoft Windows 15.Generally software can be divided into two types: software system and _________ system. A.hardware B.DOS C.application D.Windows 16.The _________ is the part of the computer where programs and data are stored. A.Input Device B.Memory C.CPU D.CU 17. refers to data storage equipment that allows the stored data to be accessed randomly rather than just in sequence. A.Random Access Memory B.Magnetic tapes C.Disks D.ROM 18.Word processing , of course, relies on perhaps the most basic computer _________ : the keyboard. 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