轮机英语2附有答案

轮机英语2[复制]229.Don’tturnhandlebeforedisengagingtheturninggear.[单选题]*AYoumustnotturnthishandle.BYoumustnotengagetheturninggear.CYoushouldnotturnthishandlebeforetheturninggearisdisengaged.(正确答案)DYoumustnotdisengagetheturninggearbeforeyouturnhandle.230.StartNo.1auxiliaryseawaterpumprightnowaftertheauxiliaryenginesrunnormally.[单选题]*AStartNo.1mainseawaterpumpimmediately.BStartNo.2mainseawaterpumpimmediately.CStartNo.1auxiliaryseawaterpumpimmediately.(正确答案)DStartNo.2auxiliaryseawaterpumpimmediately.231.Twogeneratorsinparallelareusedgenerallyasthemainpowersupply.[单选题]*ATherearetwogeneratorsonboard.BThemainpowersupplyisproducedwithtwogeneratorsinparallel.(正确答案)CTheemergencygeneratorisbeingusednow.DThemaingeneratorsareoutoforder.232.Theauxiliaryenginehasrunsafelyandcontinuouslyformorethan2,000hours.[单选题]*ATheauxiliaryenginehasrunstablyforoveronemonth.BThemainenginehasrunnormallyforovertwomonth.CThemainenginehasrunnormallyforover3,000hours.DTheauxiliaryenginehasrunstablyforover2,000hours.(正确答案)233.Thesecondengineerhadtheexpansionvalverepaired.[单选题]*AThesecondengineerrepairedtheexpansionvalvehimself.BSomeonerepairedtheexpansionvalve.(正确答案)CTheexpansionvalvewasrenewed.DTheexpansionvalveshouldberenewed.234.Thetubesintheshell-and-tubecondenserarefouled.[单选题]*AThetubesarefoundclean.BThetubesarefounddirty.(正确答案)CThetubesarefoundleaky.DThetubesshouldbewelded.235.Theairconditioningsystemisoutoforder.[单选题]*ATheairconditioningsystemisingoodorder.BThereissomethingwrongwiththeairconditioningsystem.(正确答案)CTheairconditioningsystemisoutofstock.DTheairconditioningsystemrunswell.236.Theairofrefrigeratingcoolantsshouldberemovedcompletely.[单选题]*APurgetheaircompletely.BPurgetherefrigeratingcoolantscompletely.CPurgetheairandrefrigeratingcoolantscompletely.DPurgetheairofrefrigeratingcoolantscompletely.(正确答案)237.Therefrigeratingcoolantsshouldberefilledfrominletvalveintime.[单选题]*ARefilltherefrigeratingcoolantsfromoutletvalveintime.BRefilltherefrigeratingcoolantsfrominletandoutletvalves.CRefilltherefrigeratingcoolantsfrominletoroutletvalve.DRefilltherefrigeratingcoolantsfrominletvalveintime.(正确答案)238.Theoilyseparatorworksnormally.[单选题]*ATheoilyseparatorrunswell.(正确答案)BTheoilyseparatorwasmadeinDenmark.CWemayusetheoilyseparator.DTheoilyseparatorshouldberepaired.239.Theseawaterpumpofthefreshwatergeneratorisnotenough.[单选题]*AThecapacityoftheseawaterpumpissmall.(正确答案)BThecapacityoftheseawaterpumpishigh.CThecapacityoftheseawaterpumpishigher.DThecapacityoftheseawaterpumpistoohigh.240.Theoutputofthefreshwatergeneratoristoolow.[单选题]*AThefreshwatergeneratorisoutoforder.(正确答案)BThefreshwatergeneratorisinorder.CThefreshwatergeneratorisrunningnormally.DThefreshwatergeneratorworksasusual.241.Itcanproduce100tonsofwaterwithinoneday.[单选题]*A100tonsofwatercanbedistilledoneday.(正确答案)B200tonsofwatercanbedistilledoneday.C100tonsofwatercanbedistilledtwodays.D300tonsofwatercanbedistilledtwodays.242.Thedesignedcapacityofthefreshwatergeneratoris35tons.[单选题]*ATheoutputofthefreshwatergeneratoris25tonsoneday.BTheoutputofthefreshwatergeneratoris30tonsoneday.CTheoutputofthefreshwatergeneratoris35tonsoneday.(正确答案)DTheoutputofthefreshwatergeneratoris40tonsoneday.243.Thefreshwatergeneratorworksabnormally.[单选题]*AThefreshwatergeneratorisingoodorder.BThefreshwatergeneratorisoutoforder.(正确答案)CThereisnothingwrongwiththefreshwatergenerator.DThegeneratorisrunningwell.244.Thefourthengineerhadtheevaporatorrepaired.[单选题]*AThefourthengineerrepairedtheevaporatorhimself.BSomeonerepairedtheevaporator.(正确答案)CTheevaporatorwasrenewed.DTheevaporatorshouldberenewed.245.Theengineerisinspectingtheoilywaterseparator.[单选题]*ATheoilywaterseparatorisbeingchecked.(正确答案)BTheoilywaterseparatorisbeingdismantled.CTheengineeristalkingabouttheoilywaterseparator.DTheoilywaterseparatorisbeingrepaired.246.Thebrakeisoutoforder.Itshouldberepairedoradjusted.[单选题]*AThebrakeneedstobereplaced.BThebrakeisoutofstock.CThebrakeisnormal.DThebrakeneedsrepairingoradjusting.(正确答案)247.Everythingisingoodorderexcepttheoilseparator.[单选题]*AEverythingisingoodorder.BThereissomethingwrongwiththeoilseparator.(正确答案)CThereissomethingwrongwiththeoilywaterseparator.DThereissomethingwrongwiththesewagewaterseparator.248.Everythingisingoodorderexcepttheoilseparator.[单选题]*AOnlytheoilseparatorisfaulty.(正确答案)BEverythingisingoodorder.CEverythingisn’tingoodorder.DTheoilseparatorisingoodorder.249.Beforeburningthegarbage,youshouldgetintouchwiththeofficeronduty.[单选题]*AYoushouldphonetheofficerondutybeforeburningtheoilsludge.BYoushouldphonetheofficerondutybeforedealingwithoilywater.CYoushouldphonetheofficerondutybeforeburningthegarbage.(正确答案)DYoushouldphonetheofficerondutybeforedealingwithsewage.250.SurelyIwillinspecttheincineratorburnermorecarefullyandmakesureitisnotblocked.[单选题]*AIwillchecktheincineratorburnermorecarefully.(正确答案)BIwillchecktheincineratorburnersurely.CIwillcheckheboilerburnermorecarefully.DIwillchecktheboilerburnersurely.251.Beforetheincineratorisfired,thefurnacemustbepurgedbyfreshairforabout10minutes.[单选题]*ATheincineratorfurnacemustbepurgedbyfreshairforabout5minutesbeforebeingfired.BTheincineratorfurnacemustbepurgedbyfreshairforabout15minutesbeforebeingfired.CTheincineratorfurnacemustbepurgedbyfreshairforabout8minutesbeforebeingfired.DTheincineratorfurnacemustbepurgedbyfreshairforabout10minutesbeforebeingfired.(正确答案)252.Theballastpumpisingoodorder.[单选题]*ATheballastpumpisoutoforder.BTheballastpumpworkswell.(正确答案)CThereissomethingwrongwiththeballastpump.DTheballastpumpdoesnotrunsmoothly.253.PleasedischargeNo.5portballasttank.[单选题]*ANo.5portballasttankwillbefilled.BNo.5portballasttankwillbede-ballasted.(正确答案)CThereareproblemswithNo.5portballasttank.DNo.5portballasttankhasbeenfilledup.254.Inspectandcleanthefloatingswitchforthesewagetreatmentplantperiodically.[单选题]*AMaintainthefloatingswitchforthesewagetreatmentplantsometimes.BMaintainthefloatingswitchfortheoilywatertreatmentplantsometimes.CMaintainthefloatingswitchforthesewagetreatmentplantperiodically.(正确答案)DMaintainthefloatingswitchfortheoilywatertreatmentplantperiodically.255.Keepairpumprunningcontinuouslyinthesewagetreatmentplant.[单选题]*ADon’tstopsupplyingairtothesewagetreatmentplant.(正确答案)BMaystopsupplyingairtothesewagetreatmentplant.CDon’tstopsupplyingairtothefreshwaterpressuretank.DDon’tstopsupplyingairtothehydraulicoiltank.256.Addingenoughdisinfectortothesewagetreatmentplantperiodically.[单选题]*AAlittledisinfectorshouldbeputintotothesewagetreatmentplantsometimes.BMoredisinfectorshouldbeputintotothesewagetreatmentplantsometime.CEnoughdisinfectorshouldbeputintothesewagetreatmentplantperiodically.(正确答案)DLessdisinfectorshouldbeputintothesewagetreatmentplantperiodically.257.Besurenottodischargethewaterdirectlyoverboard.[单选题]*ADon’tdischargethewaterdirectlyoverboard.(正确答案)BDischargethewaterdirectlyoverboard,please.CThewaterissuretobedischargedoverboard.DTodischargethewaterdirectlyoverboardisnotdifficult.258.Pleaseinspecttheoilpressureofthesteeringgearsystematonce.[单选题]*AWhatisthematterwiththesteeringgear?BWhatistheconditionofthesteeringgear?CChangethesteeringgearintohand-drivensteeringgear.DChecktheoilpressureofthesteeringgearsystemimmediately.(正确答案)259.Weshouldtestthesteeringgeareachvoyage.[单选题]*AThesteeringgearshouldbetestedeachweek.BThesteeringgearshouldbetestedeachvoyage.(正确答案)CThesteeringgearshouldbetestedeachmonth.DThesteeringgearshouldbetestedeachday.260.Thisisanautomaticchangeoverswitch.[单选题]*AThisisadomesticchangeoverswitch.BThischangeoverswitchishome-made.CThischangeoverswitchworksautomatically.(正确答案)DThechangeoverswitchiscontrolledbyhand.261.Closethelowerandupperseawaterinletvalvesimmediately.[单选题]*AShutoffboththelowerandupperseawaterinletvalvesatonce.(正确答案)BShutoffboththelowerandupperseawateroutletvalvesatonce.CClosetherightseawaterinletvalvenow.DCloseeithertheupperorlowerseawaterinletvalvesrightnow.262.Pleasetransfer15.5tonsofballastwaterfromNo.1porttoNo.2starboard.[单选题]*ATheamountofballastwatertransferredis15.5tons.(正确答案)BTherewillbetotally50.5tonsofballastwatertransferred.CTheballastwaterwillbetransferredfromNo.2toNo.1.DNotransferwiththeballastwater.263.Whenkeepingwatch,weshouldinspectthebilgesystemcarefully.[单选题]*AThebilgesystemshouldbeinspectedcarefully.(正确答案)BWeshouldinspectthesludgeoilsystemcarefully.CWeshouldinspectthesewagesystemcarefully.DWeshouldinspectthefueloilsystemcarefully.264.Theballastingpumpcanbereplacedwiththemainseawaterpump.[单选题]*AThemainseawaterpumpcanbereplacedwiththeballastingpump.BThemainseawaterpumpcanreplacetheballastingpump.(正确答案)CTheballastingpumpcanbereplacedwiththefire-fightingpump.DTheballastingpumpcanbereplacedwiththeauxiliaryseawaterpump.265.IwillrenewtheremotecontrolvalveofNo.4cranebecausethesealingconditionofthevalveispoor.[单选题]*ATheremotecontrolvalveofNo.4craneisgood.BThesealingconditionofthevalveispoor.(正确答案)CTheremotecontrolvalveofNo.5craneisfaulty.DTheremotecontrolvalveofNo.6craneisfaulty.266.Thesepipesareobviouslydistorted.[单选题]*AThesepipesareobviouslyleaky.BThesepipesareobviouslydeformed.(正确答案)CThesepipesareobviouslybroken.DThesepipesareobviouslydestroyed.267.There’saloudnoiseinthegearboxofthewindlass.[单选题]*AThewindlassisnoisy.BThegearboxisnoisy.(正确答案)CThewindlassnoiseislow.DThegearboxislow.268.Weldingisonlyatemporarymeasure,Isuggestrenewingit.[单选题]*AI’dliketoweldit.BI’dliketorenewit.(正确答案)CI’dliketouseittemporarily.DI’dliketomeasureit.269.Ifitisreallybeyondpatching,justrenewit.[单选题]*AIt’sbeyondpatching.BIfyourenewit,weneedn’tpatchit.CYoumaynotrenewit.DRenewit,ifnecessary.(正确答案)270.Wehavetousethiskindofpipeundersuchcircumstances.[单选题]*AWecanonlyusethiskindofpipenow.(正确答案)BThiskindofpipeisgoodforuse.CWemayuseanotherone.DIlikethisone.271.Ithinkthatpolishingisagoodmeanstorepairscore.[单选题]*AAgoodmeanstorepairscoreispolishing.(正确答案)BAgoodmeanstorepairscoreiswelding.CAgoodmeanstorepaircorrosionisgrinding.DAgoodmeanstorepaircorrosionispolishing.272.Wehavetostudytheoperationmanualcarefully.[单选题]*AWehavelearnedtheoperationintroductionsbyheart.BWehavetokeeptheoperationintroductionsinmind.CWehavetoreadtheoperationintroductionscarefully.(正确答案)DWehavetorefertotheoperationintroductionscarefully.273.Shallwecheckupthetechnicaldata,Chief?[单选题]*AAreyoureadytocheckthedata,chief?BWillyoucheckupthedata,please?CLet’scheckupthedata,shallwe?(正确答案)DPleasecheckupthedata,willyou?274.Thewiresshouldbecorrectlyconnectedtoassurethecorrectphasesequence.[单选题]*AAfterconnectingthewires,pleasechecktheload.BAfterconnectingthewires,pleasechecktheswitchboard.CAfterconnectingthewires,pleasecheckthephasesequence.(正确答案)DAfterconnectingthewires,pleasechecktheresistance.275.Keeptheelectricalequipmentclean,itisessentialforgoodoperation.[单选题]*AItisimportanttokeeptheelectricalequipmentclean.(正确答案)BItisimportanttoknowtheoperationoftheelectricalequipment.CItisimportanttoknowthetypeoftheelectricalequipment.DGoodoperationdependsonmuchelectricalknowledge.276.Thegeneratorsshouldrunwithoutsparksandnoises.[单选题]*AThegeneratorsareworkingwithoutsparksnow.BThegeneratorsareworkingwithoutnoisesnow.CThegeneratorsshouldworkwithnoisesandsparks.DThegeneratorsshouldnotworkwithnoisesandsparks.(正确答案)277.Pleasetestemergencyfirefightingpumpeachweek.[单选题]*ATheemergencyfirefightingpumpistestedeachmonth.BTheemergencyfirefightingpumpistestedeachweek.(正确答案)CTheemergencyfirefightingpumpistestedeachday.DTheemergencyfirefightingpumpistestedtwoweek.278.Startfirefightingwaterpumpandbuildupwaterpressurewithin2minutes.[单选题]*AStartfirefightingwaterpumpwithin2minutes.(正确答案)BStartemergencyfirefightingpumpwithin5minutes.CStartemergencyfirefightingpumpwithin2minutes.DStartfirefightingwaterpumpwithin5minutes.279.Ifanyleakageisfoundout,pleasereportittomeatonce.[单选题]*AIwonderifthereisleakage.BIdon’tknowifthereisleakage.CLetmeknowassoonasanyleakageisfoundout.(正确答案)DLetmeknowifanyleakageisfoundout.316.Pleaseinformusatonceinanemergencycase.[单选题]*AIfthereisnothingserious,pleaseinformus.BIfnothingisemergency,pleaseinformus.CWeareinformedifsomethingisnormal.DIfthereisanemergencycase,pleaseinformus.(正确答案)317.Youhavefoundoutthetrouble.[单选题]*AThetruckhassometrouble.BThetroublewastraced.(正确答案)CYouhavegotsometroubleintrading.DWehavegotnotrouble.318.Iputoilreceiptinthebookcase.[单选题]*AItookitoutfromthebookcase.BIputitinthebookcase.(正确答案)CIwanttotakeitaway.DI’dliketokeepitinthebriefcase.319.Theyaretryingtofindoutthemalfunction.[单选题]*ATheyaretryingtodetectthetrouble.(正确答案)BTheywanttofindtheport.CTheywanttofindtheway.DTheywanttofindthecourse.320.Ithasbeenworkingverywelleversinceitsinstallation.[单选题]*AItworksverywellallthetime.(正确答案)BThereisnothingwrongwithitsinstallation.CWemakegooduseofit.DWehaveputitintousesinceitsinstallation.321.Ithassomethingtodowiththelastrepair.[单选题]*AYouhavesomethingtoberepaired.BYourepairedsomethinglasttime.CItisrelativetothelastrepair.(正确答案)DThereissomethingwrongsincelastrepair.322.It’sbetterforyoutoleaveareceiptforspareparts.[单选题]*AYouareleavingforspareparts.BYou’dbetterrepairspareparts.CPleaseleaveareceiptforspareparts.(正确答案)DYouaresogoodthatyouhaveleftthereceiptforspareparts.323.Speeditupgradually.[单选题]*AComeon!BPleasestanduponebyone.CPleasespeeduplittlebylittle.(正确答案)DReduceitsspeedgradually.324.Theymustruncontinuouslyatratedpowerforonehour.[单选题]*ATheymustrunontheroadforonehour.BTheymustlearntohandlethetoolcontinuously.CTheymustbekeptrunningatfullloadforonehour.(正确答案)DTheymustruncontinuouslyatfullspeedforonehour.325.Notroublewithmainengine.[单选题]*ANoproblemwithmainengine.(正确答案)BNoproblemwithdonkeyengine.CNoproblemwithmachinery.DNoproblemwithsteeringgear.326.Wehavetostopmainengine.[单选题]*AWecandoanythingbutstopmainengine.BWecandonothingbutstopmainengine.(正确答案)CWhatwecan’tdoistostopmainengine.DThemainenginecan’tbestopped.327.TheETAattheSuezCanalistentomorrowmorning.[单选题]*ATheshipisgoingtosailattentomorrowmorning.BTheshipisgoingtoreachSuezCanalattentomorrowmorning.(正确答案)CTheshipisgoingtopassSuezCanalattentomorrowmorning.DTheshipisgoingtoanchoratPanamaCanalattentomorrowmorning.328.Pleasetellmetheworkingconditionoftheauxiliaryengine.[单选题]*ATheauxiliaryengineisworkingproperly.BPleasetellmehowthemainengineisworking.CI’mpleasedtoknowtheworkingconditionoftheauxiliaryengine.(正确答案)DI’mpleasedtotellyoutheworkingconditionoftheauxiliaryengine.329.Thereisonlyonepossibilitytocausethistrouble.[单选题]*AThetroubleresultsfrommanycauses.BIt’simpossibletocausethetrouble.COnlyonecasecancausethetrouble.(正确答案)DThetroublecanonlycauseonepossibility.330.“Finishedwithengine”isringingup.[单选题]*AMovementofengineisnolongerrequired.(正确答案)BMaketheenginereadyforsailing.CMaximummaneuveringenginespeed.DThemainenginehasstopped.331.It’stimetohandoverduty.[单选题]*AIt’stimetotakeoverduty.BIt’stimetocomeoffduty.(正确答案)CYouarefreeofduty.DYouhavetokeeponyourduty.332.Iwonderhowhydraulicsteeringgearisworking.[单选题]*AI’msurprisedhydraulicsteeringgearisworking.BI’dliketoknowhowhydraulicsteeringgearisworking.(正确答案)CIdon’tknowatwhatspeedhydraulicsteeringgearisworking.DIdon’tknowwhenhydraulicsteeringgearisworking.333.Icandonothingwhenauxiliaryengineisstillrunning.[单选题]*AIcan’tdoitwhileauxiliaryengineisrunning.(正确答案)BAuxiliaryengineisstillrunning.CIcandoitevenwhenauxiliaryengineisstillrunning.DIcan’tmakeauxiliaryenginerun.334.Theseaisheavy.[单选题]*AIt’sfoggy.BTheseaisrough.(正确答案)CTheseaissmooth.DThevisibilityispoor.335.Pleasecallupsecondengineer.[单选题]*ATellsecondengineer,please.BRingupsecondengineer,please.(正确答案)CWakeupsecondengineer,please.DCallonchiefengineer,please.336.Thegangwayhasbeentakenin.[单选题]*AThegangwaywillbelifted.BWehadputdownthegangway.CTheyhaveliftedthegangway.(正确答案)DThegangwayhasbroken.337.Askthebridgeforpermissionbeforestoppingthemainengine.[单选题]*AInformthebridgeafterstoppingthemainengine.BNoticethebridgebeforestartingthemainengine.CGetpermissionfromthebridgebeforestoppingthemainengine.(正确答案)DReportthesituationaboutthemainengine.338.Payattentiontofoulanchors.[单选题]*AAnchorisaweigh.BCablesaretight.CAnchorsareacross.(正确答案)DChainsareclear.339.Iwonderifthesurveyreporthascome.[单选题]*ALet’sanalyzethereport.BThesurveyreporthasbeenlookedthrough.CThesurveyreporthasbeenchecked.DIwanttoknowwhetherthesurveyreporthascomeornot.(正确答案)340.Oh,I’llcheckitinourengineroomlogbook.[单选题]*AI’lllookaroundourengineroom.BI’llinspectourengineroom.CI’lllookthroughthelogbook.(正确答案)DPleasetakecareofourengineroomlogbook.341.Theshipissailingincongestedwaters.[单选题]*ATheshipissailinginunshelteredwaters.BTheshipisvoyaginginnarrowwaters.(正确答案)CTheshipsailsinunshelteredwaters.DTheshipsailsincongestedwaters.342.Ourshipstartssailingat15:00.[单选题]*AOurshipisgoingtosailat15:00.(正确答案)BOurshipplanstosailat08:00.COurshipplanstoarriveattheportat16:00.DStandbyenginehastobefinishedafter15:00.343.Pleasestandbyengineat18:00.[单选题]*APleaseprepareforengineat17:00.BPleasemakethepreparationforengineat16:00.CStandingbyenginehasbeencarriedoutat18:00.(正确答案)DStandingbyenginehasbeenfinishedat18:00.344.Pleaseinformthirdengineertostandbyengine.[单选题]*ATellthirdengineertostandbyengineplease.(正确答案)BAskthirdengineertostopengineplease.CWakeupthirdengineertostandbyengineplease.DCallonthirdengineertostandbyengineplease.345.It’stimeforstandbyenginenow.[单选题]*ATheengineerispreparingforstartingtheengine.(正确答案)BMainengineiswellpreparednow.CPreparationshavealreadybeenfinished.DMainenginecan’tbestartedfornavigationnow.346.I’llgivemainengineareversingtrial.[单选题]*AMainenginewillbestartedahead.BMainenginewillbestartedastern.CMainenginewillbestartedaheadandastern.DMainenginewillbestartedaheadorastern.(正确答案)347.Youcantrymainengineonpowernow.[单选题]*ANowyouareallowedtoturnonmainengine.(正确答案)BYoucanstopmainenginenow.CYoucanspeedupmainenginenow.DYoucantakeanindicatedcardnow.348.Everythingisinorder,wewillgivemainengineabrieftrial.[单选题]*AWeshouldtrymainenginebeforeeverythingisgood.BTrythemainenginetomakesureeverythingisallright.CWedidn’thavemainenginetriedonlytofindthateverythingwasOK.DWedon’ttrytheengineuntileverythingisverywell.(正确答案)349.Ourshipwillarriveatthepilotstationaboutanhour.[单选题]*AOurshipwillreachthepilotstationaboutanhour.(正确答案)BThedutyofficerwillarriveaboutanhour.CThepilotwillcomeaboardinanhour.DThedutyofficerinformedusofthetimeofdeparture.350.Givemainengineseveralturnsslowlywiththeturninggear.[单选题]*ATheturninggeariscomplete.BTheenginetrialisfinished.CTurnmainengineseveralrevolutionsbytheturninggear.(正确答案)DDisengagetheturninggearbeforestartingtheengine.351.Disengagetheturninggear.[单选题]*AEngagetheturninggear.BPutintheturninggear.CTakeouttheturninggear.(正确答案)DRepairtheturninggear.352.Keepawayfrommainenginewhenitisrunningabnormally.[单选题]*ADon’tstandclosetomainenginewhenitisrunningabnormally.(正确答案)BDon’tstandawayfrommainenginewhenitisrunningabnormally.CDon’tstandawayfromauxiliaryenginewhenitisrunningabnormally.DDon’tstandclosetoauxiliaryenginewhenitisrunningabnormally.353.Thepilotwillboardshipat06:30.[单选题]*AThepilotwillcomeonboardshipat06:30.(正确答案)BThepilotwillcomeonboardat06:00.CWewillleavetheportat06:30.DWewillarriveattheportat06:30.354.Pleasereducemainenginespeedto120rpm.[单选题]*AThespeedoftheshipwillbedecreased.BThespeedofmainenginewill