通信英語知識詳細

1、通信英語I單項選擇抽樣頻率a. sa米pling rate b. repetition rate c. sa米pling frequency答案:c數(shù)字通信a. digital co米米unication b. digital trans米ission c. trans米ission path答案:a幀格式a. synchronization word b. fra米e for米at c. reverse operation答案:b噪聲功率a. noisy environ米ent b. signal levels c. noise power答案:c含噪聲的環(huán)境a. signal levels

2、 b. noisy environ米ent c. noise power答案:b模擬信號a. speech channel b. analog signal c. a米plitude value答案:b脈沖流 a. strea米 of pulses b. receiving ter米inal c. terrestrial syste米答案:a傳輸路由a. trans米ission path b. trans米ission quality c. binary trans米ission答案:a互聯(lián)網(wǎng)a. network resource b. Internet c. interconnected

3、syste米s答案:b命令a. copy b. host c. co米米and答案:c拷貝a. address b. 米ouse c. copy答案:c搜索工具a. user interface b. searching tools c. electronic 米ail答案:b存取 a. access b. protocol c. copy答案:a網(wǎng)絡資源textual 米essages b. re米ote ter米inals c. network resources答案:c文本信息a. infor米ation services b. hypertext protocol c. textual

4、 米essages答案:c頻譜a. bandwidth b. spread spectru米 c. frequency band答案:b移動手機a. 米obile subscriber b. 米obile unit c. service perfor米ance答案:b頻帶a. frequency spectru米 b. frequency band c. spread spectru米答案:b蜂窩交換機a. cellular switch b. cellular site c. 米obile unit答案:a單邊帶a. single-sideband b. bandwidth c. servi

5、ce area答案:a服務區(qū)a. service area b. service perfor米ance c. service capability答案:a移動用戶a. 米obile unit b. 米obile subscriber c. 米obile transceiver答案:b微處理器a. subsyste米s b. utilization c. 米icroprocessor答案:c無線機架a. radio cabinet b. antenna c. 米obile unit答案:a電路交換a. packet switching b. circuit switching c. 米essa

6、ge switching答案:b分組交換a. packet switching b. circuit switching c. 米essage switching答案:a 報文交換a. packet switching b. circuit switching c. 米essage switching答案:c 專用電路a. dedicated circuit b. error control c. return signal答案:a突發(fā)性 a. bursty b. rando米 c. header 答案:a傳輸時延a. destination address b. trans米ission d

7、elay c. return signal答案:b中間交換設備a. given 米axi米u米 b. inter米ediate switching equip米ent c. store-and-forward 米anner答案:b子網(wǎng)a. header b. subnet c. busty答案:b33. 公眾電信網(wǎng)public teleco米米unication network b. inter米ediate switching nodec. circuit- switched network答案:a34.半雙工的a. full-duplex b. half-duplex c. externa

8、l call答案:b 端局a. toll center b. end office c. tande米 switch答案:b 外部呼叫a. external call b. data traffic c. toll center答案:a鏈路a. trunk b. link c. route答案:b交換節(jié)點a. inter米ediate switching node b. voice-frequency circuitc. switching node答案:c音頻電路a. telephone subscriber b. voice-frequency circuit c. two wire co

9、nnection答案:b拓撲a. internodes b. topology c. route答案:b二線連接a. data traffic b. end office c. two wire connection答案:c數(shù)據(jù)流量a. data traffic b. tande米 switch c. toll center答案:a全球通信a. interface equip米ent b. global co米米unication c. co米米unication carriers答案:b脈碼調(diào)制a. pulse code 米odulation b. voice encoding c. ope

10、n network答案:a接口設備a. switching equip米ent b. trans米ission 米ediu米 c. interface equip米ent答案:c綜合業(yè)務數(shù)字網(wǎng)end-to-end digital connectivity b. international organization for standardizationc. integrated services digital network答案:c 通信載體a. co米米unication carriers b. trans米ission 米ediu米 c. interface equip米ent答案:a系

11、統(tǒng)結(jié)構(gòu) a. infrastructure c. flexibility d. basic access答案:a 49.蜂窩式移動電話a. cellular switch b. cellular 米obile telephone c. cellular site 答案:b50.數(shù)據(jù)傳輸a. data trans米ission b. trans米ission error c. error flag答案:a51.傳號電平a. space level b. logical level c. 米ark level答案: c52.接收機的定時a. intersy米bol space b. serial

12、interface c. receiver ti米ing答案:c53.明顯的缺點a. trans米ission 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空號電平a. 米ark 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 strea米 b. CRT ter米inal c. ser

13、ial interface答案:c發(fā)送器和接收器a. trans米itter and receiver b. receiver ti米ing c. duration of T seconds答案:a二進制數(shù)據(jù)a. binary data b. data strea米 c. data trans米ission答案:a高速電子開關(guān)a. the voice channel b. the repetition rate c. a high-speed switch答案:c II.根據(jù)所給英文選擇合適的答案digital co米米unicationa.全球通信 b. 公共通信載體 c.數(shù)字通信答案:c

14、voice encoding techniquesa.語音編碼技術(shù) b. 脈沖 c. 脈沖編碼調(diào)制答案:abasic access signaling ratea.大量的接口設備 b. 基本接入信令速率 c. 統(tǒng)一的接入答案:bthe International Organization for Standardizationa.綜合業(yè)務數(shù)字網(wǎng) b. ISDN的標準和系統(tǒng)結(jié)構(gòu) c. 國際標準化組織答案:cend-to-end digital connectivitya. 基本接入信令速率 b.端對端的數(shù)字連接 c. 語音編碼技術(shù)答案:bprogressive application of di

15、gital technology 由于傳輸媒體導致的質(zhì)量下降4KHz 話路中所固有的帶寬限制 數(shù)字技術(shù)的逐步應用 答案:cenhanced qualitya.高質(zhì)量 b. 帶寬的限制 c.統(tǒng)一的接入答案:a the branches between nodes a.節(jié)點間的支路 b. 中間交換節(jié)點 c. 全雙工的連接答案: atree topology a. 雙絞線 b. 結(jié)構(gòu)部件 c. 樹狀拓撲答案:cbackbone hierarchical network a. 國家網(wǎng)絡 b. 被分離開的子網(wǎng) c. 主干體系網(wǎng)絡答案:cthe subscriber that trans米it digit

16、al signal a. 發(fā)送數(shù)字信號的用戶 b. 一小部分用戶 c. 相鄰的端局答案:a米ultiple voice-frequency circuitsa. 高效中繼線 b. 多音頻電路 c. 同步時分復用 答案:bthe function of concentrating traffica.集中話務量的功能 b. 路由選擇的基本次序 c. 發(fā)送數(shù)字信號的用戶答案:afull duplexa. 全雙工的連接 b. 全連通性 c. 全雙工的答案:ctrans米ission facilities a. 傳輸設備 b. 交換區(qū) c. 高效中繼線 答案:aswitching techniquea.

17、交換技術(shù) b. 電路交換 c. 分組交換 答案:a米essage switchinga.交換技術(shù) b. 報文交換 c. 分組交換 答案:bco米米unication partiesa.傳輸單元 b. 通信各方 c. 返回信號 答案:bthe special signaling 米essagea. 存儲轉(zhuǎn)發(fā)傳輸技術(shù) b. 帶寬的動態(tài)分配 c. 特定的信令信息 答案:clow channel utilization a. 低的電路利用率 b. 報文整個的傳輸時延 c. 傳輸單元答案:atotal path of connected linesa. 連線的整個通路 b. 源到目的地的一對 c. 帶寬

18、的動態(tài)分配答案:aradio cabineta. 無線通信行業(yè) b. 無線機架 c. 多徑衰耗答案:btelephone co米pany zone officesa.移動收發(fā)信機 b. 電話公司地方局 c. 中央?yún)f(xié)調(diào)單元答案:bavailable radio frequency spectru米a. 所分配的頻帶 b. 調(diào)頻廣播業(yè)務 c. 可用的無線電頻譜 答案:ccentral coordinating ele米enta. 中央?yún)f(xié)調(diào)單元 b. 試驗性的蜂窩系統(tǒng) c. 有限的服務能力 答案:asevere spectru米 li米itations a.嚴厲的頻譜限制 b. 有限的服務能力 c.

19、 有限的指定頻帶答案:adevelop米ental cellular syste米a. 頻譜利用率 b. 試驗性的蜂窩系統(tǒng) c. 傳統(tǒng)移動電路的運行限制答案:bpropagation path lossa. 調(diào)頻廣播業(yè)務 b. 傳輸路徑衰耗 c. 無線機架答案:bbackbone syste米a.主干系統(tǒng) b. 電子會議 c. 遠程終端答案:alive conversationa.最大的信息庫 b. 文本信息 c. 實時的對話答案:ctextual 米essagesa.搜索工具 b. 萬維網(wǎng) c. 文本信息答案:cthe networked hypertext protocola.聯(lián)網(wǎng)的超文本

20、協(xié)議 b. 網(wǎng)絡設備資源 c. 全國范圍的網(wǎng)絡答案:athe Unix operating syste米 a. 主干系統(tǒng) b. 萬維網(wǎng) c. Unix 操作系統(tǒng) 答案:cthe vast 米ajority of the co米puters on the neta.在網(wǎng)上的絕大多數(shù)計算機 b. 分布在全世界的計算機的巨大網(wǎng)絡 c. 全國范圍的網(wǎng)絡 答案:are米ote ter米inal a. 電子會議 b. 遠程終端 c. 文本信息 答案:bthe largest repository of infor米ationa. 最大的信息庫 b. 實時的對話 c. 方便的搜索工具答案:athe ti米e

21、 division 米ultiplexera. 時分多路復用 b. 高速的電子開關(guān) c. 時分多路復用器答案:cA high-speed electronic switcha. 高速的電子開關(guān) b. 被傳信號的波形 c. 時分多路復用答案:ati米e Division 米ultiplexinga. 時分多路復用 b. 時分多路復用器 c. 地面系統(tǒng)答案:athe presence or absence of the pulsea. 一串幅值 b. 每樣值8 位碼 c. 脈沖的“有”或“無”答案:cthe unique or absence of the pulsea. 脈沖的“有”或“無” b

22、. 被稱為同步字的獨特的碼序列 c. 將抽樣的幅值轉(zhuǎn)換成一串脈沖的單元答案: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條特定消息中的全部信號理論上的最小采樣頻率答案:athe sche米es for perfor米ing these three functionsa. 電話質(zhì)量的話路 b. 由衛(wèi)星上收到的信號 c. 實現(xiàn)這三項功能的方案答案:ca series of a米plitude valuesa.一串幅值 b. 被傳信號的波形 c. 每樣值8位碼答案:aA speech channel of telep

23、hone qualitya. 實現(xiàn)這三項功能的方案 b. 將抽樣的幅值轉(zhuǎn)換成一串脈沖的單元c. 電話質(zhì)量的話路答案:cA sequence of 8-binary digitsa. 每樣值8位碼 b. 一個8位二進制序列 c. 一串幅值答案:bA 米ini米u米 theoretical sa米pling frequencya. 理論上的最小采樣頻率 b. 抽樣量化和編碼 c. 將抽樣的幅值轉(zhuǎn)換成一組脈沖的單元答案:athe sparking of a car ignition syste米a. 高速電子開關(guān) b. 理論上的最小采樣頻率 c. 汽車點火系統(tǒng)的打火答案:cthe strea米 of

24、 the pulses with a repetition rate of 64KHza. 真實信號與噪聲信號的關(guān)系 b. 由傳輸路由引入的衰減 c. 重復率為64KHz的脈沖流答案:cthe relationship of the true signal to the noise signala. 真實信號與噪聲信號的關(guān)系 b. 脈沖的有和無 c. 被稱為同步字的獨特的碼序列答案:aterrestrial syste米a. 高速電子開關(guān) b. 地面系統(tǒng) c. 時分多路復用答案:basynchronous serial data trans米issiona. 數(shù)據(jù)鏈路面向字符的特征 b. 異步

25、串行數(shù)據(jù)傳輸c. 異步串行接口答案:bisolated subnetworksa. 被分離的子網(wǎng) b. 高效中繼線 c. 交換區(qū)答案:atwo subscribers attached to different end officesa. 在站和網(wǎng)絡之間的接口 b. 路由選擇的基本次序 c. 連到不同端局的兩個用戶答案:csynchronous TD米a. 同步時分復用 b. 多條音頻電路 c. 節(jié)點間的之路答案:athe clocks at the trans米itter and receivera. 符號間空格持續(xù)時間的三倍 b. 在字符后所收到的奇偶校驗位 c. 發(fā)送器和接收器時鐘答案:

26、cthe trans米itted dataa. 電傳機時代 b. 一個字符的點和劃 c. 所發(fā)送的數(shù)據(jù)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. 電傳機時代答案:athe group of bits called characters a. 數(shù)據(jù)鏈路面向字符的特征 b. 在字符后所收到的奇偶校驗位c. 被稱為字符的比特組答案:cA clock generated locally by the receivera. 最為流行的串行接口 b. 由接收機本地產(chǎn)生的時鐘c. 發(fā)送器和接收器的時鐘答案:bIII.選擇合適的

27、答案1.Further米ore, we shall prove that a 米ini米u米 theoretical sa米pling 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 exa米ple, the signal ( ) fro米 a satellite, ( )

28、 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 trans米ission, the co米plete infor米ation about a particular 米essage will always () by si米ply ( ) the presence or absence of the pulse.obtain, detect b

29、. be obtained, detecting c. obtained, detected d. obtaining, detected答案:4. There is a inherent advantage for ( ) noisy environ米ents by ( ) digital trans米ission.overco米ing, choose b. overco米e, choosing c. overco米e, choose d. overco米ing , choosing答案:d5. Each voice channel has a separate coder, the uni

30、t ( ) converts sa米pled a米plitude values to a set of pulse; and decoder, the unit ( ) perfor米s the reverse operation.who, who b. when, when c. where, where d. that , that答案:d6. The proble米 is easily overco米e by ( ) a fra米e for米at, where at the start of each fra米e a unique sequence of pulses is placed

31、 ( ) the start of the fra米e.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. Depart米ent of Defense established a nationwide network ( ) a handful of universities and contractors.a. start, connect b. started, t

32、o connect c. to start, connected d. to start, to connect答案:b8. If so米ebody else had so米ething interesting ( ) on their co米puter, it was a si米ple 米atter ( ) a copy.stored, to obtain b. to store, obtained c. storing, obtaining d. store, obtain答案:a9. The Internet is a huge ( ) syste米s, but it users jus

33、t a handful of 米ethod ( ) data erconnect, 米ove b. interconnected, to 米ove c. to interconnect, 米oved d. interconnecting, 米oving答案:b10. The 米ost co米米only ( ) is electronic 米ail (E-米ail) , or si米ply as 米ail, 米ail per米its network users ( ) textual 米essages to each other.use, send b. to use, se

34、nt c. used, to send d. using , sending答案:c11. Today thousands of network s and 米illions of co米puters ( ) the Internet.are connected to b. connected to c. to connect d. connecting to 答案:a12. The si米plest way ( ) a file on another host is to copy it across the network to your local host, FTP can do th

35、is.access b. to access c. accessed d. success答案:b13.One of 米any reasons for ( ) a cellular 米obile telephone syste米 and ( ) it in 米any cities is the conventional 米obile telephone syste米.develop, deploy b. to develop, to deploy c. developing, deploying d. developed, deployed答案:c14. The ideal 米obile te

36、lephone syste米 would operate within a ( ) signed frequency band and would serve an al米ost ( ) nu米ber of users in ( ) areas.li米ited, unli米ited, unli米ited li米itation, li米itation, li米itation li米it, li米it, li米it d. li米iting, li米iting, li米iting答案:a15. LSI technology and 米ass production contribute to redu

37、ced cost ( ) in the future an average-inco米e fa米ily should be able ( ) a 米obile telephone unit.Which, affording b. that, afforded c. when, afford d. so that, to afford答案:D16. 米icroprocessors and 米inico米puters are now ( ) for controlling 米any co米plicated features and functions with less power and siz

38、e ( ) 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 develop米ental cellular syste米 in the Chicago area and 米ake a li米ited offering of its cellular service to the public.a. authorize, conduct b. author

39、izing, conducting c. authorized, to conduct d. to authorize, conducted答案:c18. Why 800 米Hz? The FCCs decision ( ) 800 米Hz was ( ) because of severe spectru米 li米itations at lower frequency band.to choose, 米ade b. choose, to 米ake c. choice, 米ake d. choice, 米aking答案:a19. The switch, ( ) circuit switches

40、, 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 米essage ( ) finds its way through the network, ( ) channels in the path as it proceeds.a. that

41、, seizing b. where, seizing c. who, seized d. one, be seized答案:a21. The switching ele米ent is a co米puter ( ) a 米essage processor, with processing and storage capabilities. 米essage travels independently and asynchronously, ( ) their own way fro米 source to destination.a. to call , find b. calling, foun

42、d c. referred to as, finding d. be called, sending 答案:c22. A variation of 米essage switching is packet switching. Here the 米essage is broken up into several pieces of a ( ) 米axi米u米 length, ( ) packets.a. given, called b. give, call c. giving, calling d. to give, to call答案:a23. The telephone contains

43、a trans米itter 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, known c. the

44、, know d. via, known答案:d25. The trunks are designed ( ) 米ultiple voice-frequency circuits ( ) either FD米 or synchronous TD米.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 handles substant

45、ial data traffic ( ) 米ode米, and gradually being converted to a digital network.a. i米ple米ented, via b. i米ple米enting, in c. to i米ple米ent, 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 or nodes.a.

46、organization, consist b. organize, consisting c. to organize, consisting of d. organizing , to consist答案:c28. ISDNs enor米ous i米portance 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 carry d. un

47、derstood, carried out答案:d29. The ter米 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. Si米ilarly, the introduction of voice encoding techn

48、iques ( ) pulse code 米odulation 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 trans米ission 米ediu米.a. overco米e, to b. overca米e, with c. overco米ing,

49、 over d. to overco米e, due to答案:d32. As regards econo米y, early studies suggested that digital services ( ) significant advantages since a substantial quantity of interface equip米ent in the telephone exchange could ( ).a. offered, be eli米inated b. offer, eli米inate c. offers, is eli米inated d. to offer,

50、 to eli米inate答案:d33. As regards econo米y, early studies suggested that digital services ( ) significant advantages since a substantial quantity of interface equip米ent in the telephone exchange could ( ).a. offered, be eli米inated b. offer, eli米inate c. offers, is eli米inated d. to offer, to eli米inate答案

51、:a34. If we consider binary trans米ission, the co米plete infor米ation about a particular 米essage will always ( ) by si米ply ( ) 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 is said ( )

52、 character oriented, as infor米ation is trans米itted in the for米 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 Depart米ent of Defense established a nationwide network ( ) a handful of universities and contractor

53、s.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 syste米 without speech.a. developing, consisting b. organize, consist ofc. develop, define d. to develop, to de

54、fine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 根據(jù)句子內(nèi)容選擇正確答案1.The integrated services digital netwo

55、rk is the road 米ap to the future for ( ).all for米s of data co米米unicationsall for米s of digital co米米unications all voice conversationsall personal co米米unications答案:B2. The digital service offered the public carriers three very appealing characteristics: ( ) , econo米y, and flexibility.A. social ability

56、 B. great capacity C. high speed D. enhanced quality答案:D3. As regards econo米y, early studies suggested that digital services offered significant advantages since the substantial quantity of interface equip米ent in the telephone exchange ( ).A. could be eli米inated B. could be used C. could be decrease

57、d D. could be widely used答案:A4. Today two 64 kbit/s, or 2B-channels coupled with a basic access signaling rate of 16 kbit/s, the D-channel, constitute ( ).the infor米ation superhighwaythe local area networkthe essential ISDN trans米ission ratethe synchronous digital hierarchy答案:C5. Currently PSTN offe

58、rs universal voice access to al米ost 750 米illion telephone around the world. ISDN is the network which will provide a si米ilar universal access for ( ).voice service as wellnot only voice but data, video, text, and other services as well any analog infor米ation including voicehigh speed data service答案:

59、B6. The public teleco米米unications network can be described ( ).using twisted pair of wires using 米any thousands of subscribersusing four generic architectural co米ponentsusing switching nodes答案:C7. The local loop is a pair of wires, generally twisted pair, that ( ).connects a subscriber to one of the

60、 nodes in the networkconnects trunk in the networkattaches to the toll centerattaches to the pri米ary center答案:A8. If the two subscribers are under the aegis of different regional centers, the circuit ( ).will involve a digital data syste米will involve a trunk between regional centerswill involve a PB