通信英语通信专业专用英语模拟测试练习题

1、通信专业专用英语模拟测试练习题I单项选择抽样频率a. sampling rate b. repetition rate c. sampling frequency答案：c数字通信a. digital communication b. digital transmission c. transmission path答案：a帧格式a. synchronization word b. frame format c. reverse operation答案：b噪声功率a. noisy environment b. signal levels c. noise power答案：c含噪声的环境a. si

2、gnal levels b. noisy environment c. noise power答案：b模拟信号a. speech channel b. analog signal c. amplitude value答案：b脉冲流 a. stream of pulses b. receiving terminal c. terrestrial system答案：a传输路由a. transmission path b. transmission quality c. binary transmission答案：a互联网a. network resource b. Internet c. inte

3、rconnected systems答案：b命令a. copy b. host c. command答案：c拷贝a. address b. mouse c. copy答案：c搜索工具a. user interface b. searching tools c. electronic mail答案：b存取 a. access b. protocol c. copy答案：a网络资源textual messages b. remote terminals c. network resources答案：c文本信息a. information services b. hypertext protocol

4、 c. textual messages答案：c频谱a. bandwidth b. spread spectrum c. frequency band答案：b移动手机a. mobile subscriber b. mobile unit c. service performance答案：b频带a. frequency spectrum b. frequency band c. spread spectrum答案：b蜂窝交换机a. cellular switch b. cellular site c. mobile unit答案：a单边带a. single-sideband b. bandwid

5、th c. service area答案：a服务区a. service area b. service performance c. service capability答案：a移动用户a. mobile unit b. mobile subscriber c. mobile transceiver答案：b微处理器a. subsystems b. utilization c. microprocessor答案：c无线机架a. radio cabinet b. antenna c. mobile unit答案：a电路交换a. packet switching b. circuit switchi

6、ng c. message switching答案：b分组交换a. packet switching b. circuit switching c. message switching答案：a 报文交换a. packet switching b. circuit switching c. message switching答案：c 专用电路a. dedicated circuit b. error control c. return signal答案：a突发性 a. bursty b. random c. header 答案：a传输时延a. destination address b. tra

7、nsmission delay c. return signal答案：b中间交换设备a. given maximum b. intermediate switching equipment c. store-and-forward manner答案：b子网a. header b. subnet c. busty答案：b33. 公众电信网public telecommunication network b. intermediate switching nodec. circuit- switched network答案：a34.半双工的a. full-duplex b. half-duplex

8、 c. external call答案：b 端局a. toll center b. end office c. tandem switch答案：b 外部呼叫a. external call b. data traffic c. toll center答案：a链路a. trunk b. link c. route答案：b交换节点a. intermediate switching node b. voice-frequency circuitc. switching node答案：c音频电路a. telephone subscriber b. voice-frequency circuit c.

9、two wire connection答案：b拓扑a. internodes b. topology c. route答案：b二线连接a. data traffic b. end office c. two wire connection答案：c数据流量a. data traffic b. tandem switch c. toll center答案：a全球通信a. interface equipment b. global communication c. communication carriers答案：b脉码调制a. pulse code modulation b. voice enco

10、ding c. open network答案：a接口设备a. switching equipment b. transmission medium c. interface equipment答案：c综合业务数字网end-to-end digital connectivity b. international organization for standardizationc. integrated services digital network答案：c 通信载体a. communication carriers b. transmission medium c. interface equ

11、ipment答案：a系统结构 a. infrastructure c. flexibility d. basic access答案：a 49.蜂窝式移动电话a. cellular switch b. cellular mobile telephone c. cellular site 答案：b50.数据传输a. data transmission b. transmission error c. error flag答案：a51.传号电平a. space level b. logical level c. mark level答案： c52.接收机的定时a. intersymbol space

12、 b. serial interface c. receiver timing答案：c53.明显的缺点a. transmission error b. obvious disadvantage c. error flag答案：b 54. 起始位a. start bit b. stop bit c. parity bit答案：a空号电平a. mark level b. space level c. the idle state答案：b控制比特a. binary data b. local clock c. control bit答案：c串行接口a. data stream b. CRT term

13、inal c. serial interface答案：c发送器和接收器a. transmitter and receiver b. receiver timing c. duration of T seconds答案：a二进制数据a. binary data b. data stream c. data transmission答案：a高速电子开关a. the voice channel b. the repetition rate c. a high-speed switch答案：c II.根据所给英文选择合适的答案digital communicationa.全球通信 b. 公共通信载体

14、c.数字通信答案：c voice encoding techniquesa.语音编码技术 b. 脉冲 c. 脉冲编码调制答案：abasic access signaling ratea.大量的接口设备 b. 基本接入信令速率 c. 统一的接入答案：bthe International Organization for Standardizationa.综合业务数字网 b. ISDN的标准和系统结构 c. 国际标准化组织答案：cend-to-end digital connectivitya. 基本接入信令速率 b.端对端的数字连接 c. 语音编码技术答案：bprogressive applic

15、ation of digital technology 由于传输媒体导致的质量下降4KHz 话路中所固有的带宽限制 数字技术的逐步应用 答案：cenhanced qualitya.高质量 b. 带宽的限制 c.统一的接入答案：a the branches between nodes a.节点间的支路 b. 中间交换节点 c. 全双工的连接答案： atree topology a. 双绞线 b. 结构部件 c. 树状拓扑答案：cbackbone hierarchical network a. 国家网络 b. 被分离开的子网 c. 主干体系网络答案：cthe subscriber that tra

16、nsmit digital signal a. 发送数字信号的用户 b. 一小部分用户 c. 相邻的端局答案：amultiple voice-frequency circuitsa. 高效中继线 b. 多音频电路 c. 同步时分复用 答案：bthe function of concentrating traffica.集中话务量的功能 b. 路由选择的基本次序 c. 发送数字信号的用户答案：afull duplexa. 全双工的连接 b. 全连通性 c. 全双工的答案：ctransmission facilities a. 传输设备 b. 交换区 c. 高效中继线 答案：aswitching

17、techniquea.交换技术 b. 电路交换 c. 分组交换 答案：amessage switchinga.交换技术 b. 报文交换 c. 分组交换 答案：bcommunication partiesa.传输单元 b. 通信各方 c. 返回信号 答案：bthe special signaling messagea. 存储转发传输技术 b. 带宽的动态分配 c. 特定的信令信息 答案：clow channel utilization a. 低的电路利用率 b. 报文整个的传输时延 c. 传输单元答案：atotal path of connected linesa. 连线的整个通路 b. 源到目

18、的地的一对 c. 带宽的动态分配答案：aradio cabineta. 无线通信行业 b. 无线机架 c. 多径衰耗答案：btelephone company zone officesa.移动收发信机 b. 电话公司地方局 c. 中央协调单元答案：bavailable radio frequency spectruma. 所分配的频带 b. 调频广播业务 c. 可用的无线电频谱 答案：ccentral coordinating elementa. 中央协调单元 b. 试验性的蜂窝系统 c. 有限的服务能力 答案：asevere spectrum limitations a.严厉的频谱限制 b.

19、 有限的服务能力 c. 有限的指定频带答案：adevelopmental cellular systema. 频谱利用率 b. 试验性的蜂窝系统 c. 传统移动电路的运行限制答案：bpropagation path lossa. 调频广播业务 b. 传输路径衰耗 c. 无线机架答案：bbackbone systema.主干系统 b. 电子会议 c. 远程终端答案：alive conversationa.最大的信息库 b. 文本信息 c. 实时的对话答案：ctextual messagesa.搜索工具 b. 万维网 c. 文本信息答案：cthe networked hypertext proto

20、cola.联网的超文本协议 b. 网络设备资源 c. 全国范围的网络答案：athe Unix operating system a. 主干系统 b. 万维网 c. Unix 操作系统 答案：cthe vast majority of the computers on the neta.在网上的绝大多数计算机 b. 分布在全世界的计算机的巨大网络 c. 全国范围的网络 答案：aremote terminal a. 电子会议 b. 远程终端 c. 文本信息 答案：bthe largest repository of informationa. 最大的信息库 b. 实时的对话 c. 方便的搜索工具答

21、案：athe time division multiplexera. 时分多路复用 b. 高速的电子开关 c. 时分多路复用器答案：cA high-speed electronic switcha. 高速的电子开关 b. 被传信号的波形 c. 时分多路复用答案：atime Division Multiplexinga. 时分多路复用 b. 时分多路复用器 c. 地面系统答案：athe presence or absence of the pulsea. 一串幅值 b. 每样值8 位码 c. 脉冲的“有”或“无”答案：cthe unique or absence of the pulsea. 脉

22、冲的“有”或“无” b. 被称为同步字的独特的码序列 c. 将抽样的幅值转换成一串脉冲的单元答案：bA sequence relating to channel1, 2 and so on涉及到第一路、第二路及其他各路的序列一条特定消息中的全部信号理论上的最小采样频率答案：athe schemes for performing these three functionsa. 电话质量的话路 b. 由卫星上收到的信号 c. 实现这三项功能的方案答案：ca series of amplitude valuesa.一串幅值 b. 被传信号的波形 c. 每样值8位码答案：aA speech chann

23、el of telephone qualitya. 实现这三项功能的方案 b. 将抽样的幅值转换成一串脉冲的单元c. 电话质量的话路答案：cA sequence of 8-binary digitsa. 每样值8位码 b. 一个8位二进制序列 c. 一串幅值答案：bA minimum theoretical sampling frequencya. 理论上的最小采样频率 b. 抽样量化和编码 c. 将抽样的幅值转换成一组脉冲的单元答案：athe sparking of a car ignition systema. 高速电子开关 b. 理论上的最小采样频率 c. 汽车点火系统的打火答案：cth

24、e stream of the pulses with a repetition rate of 64KHza. 真实信号与噪声信号的关系 b. 由传输路由引入的衰减 c. 重复率为64KHz的脉冲流答案:cthe relationship of the true signal to the noise signala. 真实信号与噪声信号的关系 b. 脉冲的有和无 c. 被称为同步字的独特的码序列答案：aterrestrial systema. 高速电子开关 b. 地面系统 c. 时分多路复用答案：basynchronous serial data transmissiona. 数据链路面向

25、字符的特征 b. 异步串行数据传输c. 异步串行接口答案：bisolated subnetworksa. 被分离的子网 b. 高效中继线 c. 交换区答案：atwo subscribers attached to different end officesa. 在站和网络之间的接口 b. 路由选择的基本次序 c. 连到不同端局的两个用户答案：csynchronous TDMa. 同步时分复用 b. 多条音频电路 c. 节点间的之路答案：athe clocks at the transmitter and receivera. 符号间空格持续时间的三倍 b. 在字符后所收到的奇偶校验位 c. 发

26、送器和接收器时钟答案：cthe transmitted dataa. 电传机时代 b. 一个字符的点和划 c. 所发送的数据答案：cthe falling edge of the start bit a. 起始位的下降沿 b. 停止位的下降沿 c. 电传机时代答案：athe group of bits called characters a. 数据链路面向字符的特征 b. 在字符后所收到的奇偶校验位c. 被称为字符的比特组答案：cA clock generated locally by the receivera. 最为流行的串行接口 b. 由接收机本地产生的时钟c. 发送器和接收器的时钟答案

27、：bIII.选择合适的答案1.Furthermore, we shall prove that a minimum theoretical sampling frequency of order 6.8KHz is required ( ) a voice channel ( ) the range 300 Hz to 3.4KHz.a. convey , occupy b. to convey, occupying c. conveying , occupied d. convey, to occupy答案：b2. For example, the signal ( ) from a sat

28、ellite, ( ) in far outer space, is very weak. . received, located b. receive, locate c. receiving, locating d. to receive, to located 答案：a3. If we consider binary transmission, the complete information about a particular message will always () by simply ( ) the presence or absence of the pulse.obtai

29、n, detect b. be obtained, detecting c. obtained, detected d. obtaining, detected答案：4. There is a inherent advantage for ( ) noisy environments by ( ) digital transmission.overcoming, choose b. overcome, choosing c. overcome, choose d. overcoming , choosing答案：d5. Each voice channel has a separate cod

30、er, the unit ( ) converts sampled amplitude values to a set of pulse; and decoder, the unit ( ) performs the reverse operation.who, who b. when, when c. where, where d. that , that答案：d6. The problem is easily overcome by ( ) a frame format, where at the start of each frame a unique sequence of pulse

31、s is placed ( ) the start of the frame.specify, identify b. specifying, so as to identify c. specified, identified d. specify, identifying答案：b7. It was ( ) in 1969, when the U.S. Department of Defense established a nationwide network ( ) a handful of universities and contractors.a. start, connect b.

32、 started, to connect c. to start, connected d. to start, to connect答案：b8. If somebody else had something interesting ( ) on their computer, it was a simple matter ( ) a copy.stored, to obtain b. to store, obtained c. storing, obtaining d. store, obtain答案：a9. The Internet is a huge ( ) systems, but i

33、t users just a handful of method ( ) data erconnect, move b. interconnected, to move c. to interconnect, moved d. interconnecting, moving答案：b10. The most commonly ( ) is electronic mail (E-mail) , or simply as mail, Mail permits network users ( ) textual messages to each other.use, send b.

34、 to use, sent c. used, to send d. using , sending答案：c11. Today thousands of network s and millions of computers ( ) the Internet.are connected to b. connected to c. to connect d. connecting to 答案：a12. The simplest way ( ) a file on another host is to copy it across the network to your local host, FT

35、P can do this.access b. to access c. accessed d. success答案：b13.One of many reasons for ( ) a cellular mobile telephone system and ( ) it in many cities is the conventional mobile telephone system.develop, deploy b. to develop, to deploy c. developing, deploying d. developed, deployed答案：c14. The idea

36、l mobile telephone system would operate within a ( ) signed frequency band and would serve an almost ( ) number of users in ( ) areas.limited, unlimited, unlimited limitation, limitation, limitation limit, limit, limit d. limiting, limiting, limiting答案：a15. LSI technology and mass production contrib

37、ute to reduced cost ( ) in the future an average-income family should be able ( ) a mobile telephone unit.Which, affording b. that, afforded c. when, afford d. so that, to afford答案：D16. Microprocessors and minicomputers are now ( ) for controlling many complicated features and functions with less po

38、wer and size ( ) was previously possible.a. used, than b. use, this c. using, they d. usage, it答案：a17. On Jan.4,1979, the FCC ( ) Illinois Bell Telephone Co. ( ) a developmental cellular system in the Chicago area and make a limited offering of its cellular service to the public.a. authorize, conduc

39、t b. authorizing, conducting c. authorized, to conduct d. to authorize, conducted答案：c18. Why 800 MHz? The FCCs decision ( ) 800 MHz was ( ) because of severe spectrum limitations at lower frequency band.to choose, made b. choose, to make c. choice, make d. choice, making答案：a19. The switch, ( ) circu

40、it switches, have no capability of ( ) users data on their way to the destination.a. calling, stored b. called, storing c. to call, to store d. be called, be stored答案：b20. The circuit is set up by a special signaling message ( ) finds its way through the network, ( ) channels in the path as it proce

41、eds.a. that, seizing b. where, seizing c. who, seized d. one, be seized答案：a21. The switching element is a computer ( ) a message processor, with processing and storage capabilities. Message travels independently and asynchronously, ( ) their own way from source to destination.a. to call , find b. ca

42、lling, found c. referred to as, finding d. be called, sending 答案：c22. A variation of message switching is packet switching. Here the message is broken up into several pieces of a ( ) maximum length, ( ) packets.a. given, called b. give, call c. giving, calling d. to give, to call答案：a23. The telephon

43、e contains a transmitter and receiver for ( ) back and forth ( ) analog voice and analog electrical signals.a. convert, in b. converting, between c. conversion, to d. converted, into答案：b24. Each subscriber connects ( ) local loop to a switching center, ( ) as an end office.a. to, calling b. with, kn

44、own c. the , know d. via, known答案：d25. The trunks are designed ( ) multiple voice-frequency circuits ( ) either FDM or synchronous TDM.a. carry, use b. carried, used c. to carry, to use d. to carry, using答案：d26. Although originally to service analog telephone subscribers, the telephone network handl

45、es substantial data traffic ( ) modem, and gradually being converted to a digital network.a. implemented, via b. implementing, in c. to implement, within d. design, on答案：a27. Designers have found it convenient ( ) these nodes into a hierarchy or tree topology, ( ) five classes of switching centers o

46、r nodes.a. organization, consist b. organize, consisting c. to organize, consisting of d. organizing , to consist答案：c28. ISDNs enormous importance is only gradually being ( ) . Years of work have been ( ) by the CCITT and the ISO.a. understand, carry b. understanded, carried c. to be understood, to

47、carry d. understood, carried out答案：d29. The term ISDN was first defined within the CCITT in 1972. It referred to a network ( ) end-to-end digital connectivity ( ) a range of services.a. providing, for b. provision, to c. provided, with d. provide, into答案：a30. Similarly, the introduction of voice enc

48、oding techniques ( ) pulse code modulation contributed ( ) the ISDNs concept evolution.a. usage, on b. using, to c. use, with d. used, so as to答案：b31. The enhanced quality is achieved when a signal is digitally encoded ( ) degradation ( ) the transmission medium.a. overcome, to b. overcame, with c.

49、overcoming, over d. to overcome, due to答案：d32. As regards economy, early studies suggested that digital services ( ) significant advantages since a substantial quantity of interface equipment in the telephone exchange could ( ).a. offered, be eliminated b. offer, eliminate c. offers, is eliminated d

50、. to offer, to eliminate答案：d33. As regards economy, early studies suggested that digital services ( ) significant advantages since a substantial quantity of interface equipment in the telephone exchange could ( ).a. offered, be eliminated b. offer, eliminate c. offers, is eliminated d. to offer, to

51、eliminate答案：a34. If we consider binary transmission, the complete information about a particular message will always ( ) by simply ( ) the presence or absence of the pulse.a. obtain, detect b. be obtained, detectingc. obtained, detected d. obtaining, detected答案：b35. An asynchronous serial data link

52、is said ( ) character oriented, as information is transmitted in the form of group of bits ( )characters.a. be, calling b. to being, to call c. been, call d. to be, called答案：d36. It was ( ) in 1969, when the U.S Department of Defense established a nationwide network ( ) a handful of universities and

53、 contractors.a. start, connect b. started, to connectc. to start, connected d. to start, to define 答案：b37. Thus was born a new, but perpetually ( ) paging services ( ) at a one-way selective signaling system without speech.a. developing, consisting b. organize, consist ofc. develop, define d. to dev

54、elop, to define答案：a38. Designers have found it convenient ( ) these nodes into a hierarchy or tree topology, ( ) five classes of switching centers.a. organizing, consisting b. organize, consist ofc. to organize, consisting of d. to organize, to consist of答案：c 根据句子内容选择正确答案1.The integrated services digital network is the road map to the future for ( ).all forms o