新编计算机英语课后习题答案(第三版)王春生

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1、UnitSeven:ComputerCommunicationsUnitSeven/SectionAI.Fillintheblankswiththeinformationgiveninthetext:1.telegraph2.dots;dashes3.media4.point-to-point5.analog6.digital7.text-based8.modemII.TranslatethefollowingtermsorphrasesfromEnglishintoChineseandviceversa:1.microwaveradio微波无线电

2、　　2.digitaltelevision数字电视　　3.DSL数字用户线路　　4.analogtransmission模拟传输　　5.on-screenpointer屏幕上的指针　　6.computerterminal计算机终端　　7.radiotelephone无线电话　　8.cellulartelephone蜂窝电话，移动电话，手机　　9.decentralizednetwork分散型网络　　10.wire-basedinternalnetwork基于导线的内部网络，有线内部网　　11.光缆fiber-opticcable　　12.传真机fa

3、xmachine　　13.无线通信wirelesscommunications　　14.点对点通信point-to-pointcommunications　　15.调制电脉冲modulatedelectricalimpulse　　16.通信卫星communication(s)satellite　　17.电报电键telegraphkey　　18.传输媒体transmissionmedium(或media)　　19.无绳电话cordlesstelephone　　20.金属导体metalconductor　　III.Fillineachoftheblan

4、kswithoneofthewordsgiveninthefollowinglist,making　　changesifnecessary:　　Datacommunicationsistheprocessoftransmittingandreceivingdatainanorderlyway　　sothedatathatarrivesatitsdestinationisanaccurateduplication(复制)ofthedatathatwas　　sent.Whendatatravelsashortdistance,suchaswhenyou

5、senddatafromyourcomputerto　　yourprinter,itisreferredtoaslocalcommunications.Whendatatravelsalongdistance,the　　communicationisreferredtoastelecommunications;theprefix(前缀)“tele”isderivedfroma　　Greekwordthatmeans“far”or“faroff.”　　Thedifferencebetweenashortdistanceandalongdistance

6、issomewhatarbitrary(武断　　的).Forexample,ifyourcomputersendsdatatoaprinterinthenextroom,itisregardedas　　localcommunications;ifyouphonethepersoninthenextroom,youaretransmittingdata　　overatelecommunicationsdevice.However,thesamebasiccommunicationsconceptsapply　　tobothlocalcommunica

7、tionsandtelecommunications.　　Basicdatacommunicationsconceptsarethebuildingblocksforunderstandinghowdata　　travelsonacommunicationssystem.Theseconceptscomeinhandy(派得上用处)whenyou　　install,configure,orupgradealocalareanetwork.Inaddition,theseconceptshelpyousetup　　modems,faxmachines

8、,andcellulardatatransfers.　　IV.Translatethefollowingpassagefr