补全短文Passage1FunctionsofpowertransmissionCEADBThefunctionof(1)istosendpowerfrompowerplantstoloadcenterortoexchange。。。A.step-downsubstationsandconnectedtransmissionequipmentB.powernetworkoperationC.powertransmissionD.transmissionathighvoltageE.powernetworksPassage2SubstationmisoperationanditspreventingCEABDThemisopemtionthatcanleadto(1)mainlyare：①on-loadswitchingofisolatingswitch；A.preventingthemisoperationinsubstationB.theclosingofgroundingswitchwithpoweronC.accidentsintheelectricaloperationofthesubstationD.thepersonsfromillegalenteringthelivedbayE.thegroundingwire(closingthegroundingswitch)withpoweronPassage3AbriefintroductiononthedevelopmentofsupercriticalboilersandtheirmainadvantagesBDEACIn(1)suchasU.S.A，JapanandEuropeancountries，thesupercritical。。。A.goodhomogenizationofdistributionB.someadvancedcountriesC.wholeprocessmanagementisstrengthenedD.greatadvantagesoileconomyandenvironmentalprotectionE.subcriticalonce-throughboilerPassage4SteamgenerationanduseBEADCSteamisoneofman’sdependableservantsMoreandmoreinthebackground，。。。A.firstgeneratingsteamB.anelectricallyheatedhomeC.useofsteamforelectricpowergenerationD.thenewgeneratingcapacitybeinginstalledE.thefuelisuraniumandtheheatissuppliedPassage5CircuitbreakerBDAECCircuitbreakersareautomaticallyoperatedhighvoltage(orhighcurrent)switches.。。。A·toperformanyswitchingoperationafterlongperiodsB.tocontrolelectricalpowernetworksC.ofthecircuitbreakerD.toswitchthecurrentwhichcanbefromafewamperesE.ofthehighestimportanceforhighreliabilityPassage6Theratioofdistancetoheightofpumped-storagepowerplantBDACEForpumped-storagepowerplant,generallytheratioofdistancetoheight(l),。。。A.ismosteconomicB.isusedtoevaluatetopographicconditionofpowerplantC.isnotdesirableD.istheratioofhorizontaldistancebetweenupperandlowreservoirE.isthebestPassage7FuelcellsBAECDFuelcellsaredevicesthatwhenafuelsuchashydrogenorhydrogen-richcompoundsandoxygenaresuppliedto。。。A.furtherdevelopmentisunderwayB.thereisnostoragecapacityinafuelcellC.manycellsareoperatedinseriestoobtainvoltagesD.supplyalternatingcurrentfromfuelcellsE.astheyarebeingdevelopedtherehavebeensomeapplicationsPassage8SubstationspaceintotheDigitalAgeCAEBDSubstationsconstitutethemainpartofpowertransmissionanddistributioninapowergrid.。。。A.substationautomationtechnologyhasreachedacertainlevelB.simulationtrainingtechnologyforsubstationoperationC.composedofalargenumberofprimaryandsecondaryequipmentsD.afull-digitalautomationsystemE.allofwhichhasbecomeanindisputablefactPassage9OvercomingtheProblemofWasteCADEBManylargecitiesareanythingbutbeautifulStreetsarelitteredwithtrash.Inthistrash,however,(1)。。。A.thereisnotimetobelostB.buildingbeautifulcitiesoutofgarbageisonlyadreamC.thereisstillsomethingthatcanbeusefulD.itcanbeputtouseagainE.moreandmoremachinesaredesignedforthispurposePassage10HibernationEBDACTheweatherinwinter.Callbeverycold.Someanimalssleepduringthewinter,。。。A.Sotheydon’tneedtoworryaboutbadweatherandotherdangerousanimalsB.Wecallthiskindofsleepinwintertime“hibernation’’C.Asitgetswarmerandwarmerinspring，thesleepinganimalsbegintowakeupandlookaroundforfoodD.Hibernatinganimalsdon’tneedtoeatmuchbecausetheydon’tmoveE.TheycansleepforalongtimePassage11SatellitesBDACEThebodythatisneatesttotheEarthisthemoon.(1).Thissatelliteis。。。A.Thebiggerandheavierabodyis,thegreaterisits...
