輪機(jī)英語2附有答案

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