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1、通信英语强化训练试题（一）Ⅰ单项选择题：(Choosethebestone)()1.Furthermore,weshallprovethataminimumtheoreticalsamplingfrequencyoforder6.8kHzisrequired_________avoicechannel_________therange300Hzto3.4kHz.A.convey,occupyB.toconvey,occupyingC.conveying,occupiedD.convey,tooccupy()2.Forexample,thesignal_
2、________fromasatellite,_________infarouterspace,isveryweak.A.received,locatedB.receive,locateC.receiving,locatingD.toreceive,tolocate()3.Ifweconsiderbinarytransmission,thecompleteinformationaboutaparticularmessagewillalways_________bysimply_________thepresenceorabsenceofthepulse
3、.A.obtain,detectB.beobtained,detectingC.obtained,detectedD.obtaining,detected()4.4.Thereisaninherentadvantagefor_________noisyenvironmentsby_________digitaltransmission.A.overcoming,chooseB.overcome,choosingC.overcome,chooseD.overcoming,choosing()5.Eachvoicechannelhasaseparateco
4、der，theunit_________convertssampledamplitudevaluestoasetofpulses;Anddecoder,theunit_________performsthereverseoperation.A.who,whoB.when,whenC.where,whereD.that,that()6.Theproblemiseasilyovercomeby_________aframeformat,whereatthestartofeachframeauniquesequenceofpulsesisplaced____
5、_____thestartoftheframe.A.specify,identifyB.specifying,soastoidentifyC.specified,identifiedD.specify,identifying()7.Anasynchronousserialdatalinkissaid_________characteroriented，asinformationistransmittedintheformofgroupsofbits_________characters.A.be，callingB.tobeing，tocallC.bee
6、n，callD.tobe，called()8.Thisinterfaceissocalledbecausethe_________dataandthe_________dataarenotsynchronizedoveranyextendedperiod.A.transmit，receiveB.totransmit，toreceiveC.transmitting，receivingD.transmitted，received()9.Serialdatatransmissionsystems_________inthetelephone，Morsecod
7、e,andeventhesmokesignalsonce_________bynativeAmericans.A.arefinding，usingB.arefound，usedC.find,useD.befound,using()10.Traditionally，theidlestate_________themarklevel.Byconventionthiscorresponds_________alogical1level.A.isreferredto,asB.isreferredas,inC,isreferredtoas,toD.isrefer
8、red，within()1.Thetransmitterthensendsthecharact
