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职称英语综合类词汇练习题.docx

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职称英语综合类词汇练习题 职称英语综合类词汇练习题 对于职称英语综合类而言，针对于谢词汇进行专门的练习是很有必要的，下面为大家送上一篇职称英语综合类词汇练习题。 compactdisks 1ifsomeonesaystoyouyourmusiccdsdon’treallyholdanymusiconthem,andtheyonlyhavenumbersrecordedonthem,youmaynotbelieveit.infact,heisrightinthatsoundisactuallyrecordedontothecdsasspecialnumbers—adigitalcode.1thecodeispressedontothecdasbumpsonalongspiraltrackalmostfivekilometerslong.thesebumpsareanaverageof0.5micronswide. 2asmalllaserbeamshinesontothebumpsasthecdturns.thelightisreflectedbacktoareceiverthatrecordshowthelaserlightbouncesback.thisletsthecdplayer2turnthereflectedlightbackintotheoriginalcode.thismeansyoucanheartheoriginalcodeasmusic. 3digitalcodesareusedwithmanytechnologies.e-mailneedsthesekindsofcodenumbers.spaceprobescommunicatewiththeirgroundstationonearthusingdigitalcodes.barcodesarereadasdigitalcodesincomputersystems.digitalcommunicationswithcellphonesneeddigitalcodes.weatherradiosalsotuneintospecificsignalsusingthesecodes. 4therearemanytypesofcompactdisk.oneformatiscalledcd-rws.theycanberecordedonandre-recordedon(rewrittenon)asyouwoulddowithafloppydisk3.anotherformatisthecd-rom.thetechnologyforrecordingonthesedisksisdifferentfromothercds.thesecdshaveadyelayerthatthecdwritercandarkenorleaveclear.theclearanddarkspotsarethedigitalcode.cd-romstandsforcompactdisc—readonly memory.4thisdiskislikea“super”floppydiskthatcanholdlotsofinformation.onecd-romcanholdthesameamountofdataas500floppydisks.informationispermanentlyrecordedontoit.computergamesandotherprogramsareconsideredtobecd-roms. 5cdswerefirstsoldtothepublicin1982.thesecdsstillplaywellandsoundfine.currentcdsareexpectedtolastbetween70to200years.ofcourse,youcanmakesureyourcdslastalongtimebytakingcareofthem. 6sciencekeepsondeveloping.itmaynotbemanymoreyearsbeforeacompletelynewtechnologyisinvented5andintroducedtothepublicformusicrecording.inthemeantime,thereisnodoubtyouwillcontinuetoenjoylisteningtoyourfavoritemusiconcds6andplayingyourfavoritecomputergamesoncd-roms. 练习: 1.paragraphs1&amp