15Inatwo-strokeengine,thepistonconsistsofalowerpart,whichisnamedasandusuallymadeof,andaupperpart,whichisreferredtoasandmadeof.low-half,castiron;top-half,heat-resistantsteellow-half,aluminum;top-half,stainlesssteelpistonskirt;castiron;pistoncrown;heat-resistantsteelpistonskirt;aluminum;pistoncrown;stainlesssteel答案C二冲程柴油机的活塞包含有两部分，下半部分称为活塞裙，通常由铸铁制成；上半部分称为活塞头，通常由耐热钢制成。18Inordertoimprovetheworkingconditionsofthecrossheadbearings,thebearingpressureismadeandtheperipheralspeedismadeinlaterdesigns.smaller,higherB.higher,smallerC.smaller,smallerD.higher,higher答案A为了改善十字头轴承的工作环境，在后来的一些设计里，轴承压力被做的更小，而边缘速度更高（有利于油膜的分布）。21Afull-flow50umfilterisinstalled,sotheinjectionsystemcomponentsonthemainenginearesafeguarded.A. asclosetothemainengineaspossibleasclosetothemainpumpaspossiblejustbeforethefuelvalvejustbeforetheboosterpump答案A一个完全流通的过滤精度为50微米的滤器被设置在尽可能靠近主机的地方，从而保护了喷油系统的部件（不受燃油中杂质的伤害）。22Theboosterpump,whichsuppliesdieseloilto,shouldhaveapossibilityofbeingpoweredbycompressedairorbyemergencypower.themainenginesB.theauxiliaryenginesC.theemergencygeneratorengineD.theauxiliaryenginesandthemainengine（s）答案B输送柴油给副机的增压泵，应当可以用压缩空气或应急电源驱动。29Inmoderninstallations,themainengineandthestandbyauxiliaryengines.canbestartedatlowtemperatureandarefreefrompreheatingusuallyarepreheatedbysteambeforebeingstartedarekeptataconstanttemperatureandfreefrompreheatingD.arekeptatalowtemperaturetosaveenergy答案C现代化船舶的主机和备用副机冷却水温度保持恒定，不需要预热。34Whenstartinganengine,thecompressedairentersthecylinderwhenthecorrespondingpistonisinpositionofits.suctionstrokeB.compressionstrokeC.powerstrokeD.exhauststroke答案C起动柴油机时，只有相应的活塞处于动力冲程的时候，压缩空气才进入气缸。大型十字头式柴油机通常有两路润滑系统，有一项功能是气缸油系统所独有的：密封。44“Thisincreaseinchargeairdensityisaccomplishedonmostmoderndieselenginetypesbyuseofexhaustgasturbo-charging,inwhichaturbinewheeldrivenbyexhaustfromtheengineisrigidlycoupledtoacentrifugaltypeaircompressor.”Accordingtothissentence,wecanknowthatincreaseschargeairdensity,drivesthecompressordirectly.amoderndieselengine,aturbinewheelamoderndieselengine,exhaustgasesacompressor,anexhaustgasturbochargeracompressor,aturbinewheel答案C（答案错，应为D）“充气密度的增加在大部分现代柴油机上是通过使用废气涡轮增加来实现的，一个由来自柴油机排气驱动的涡轮（透平）刚性连接着一个离心式的压气机。”根据这句话，我们可以知道，压气机增加了充气密度，而涡轮（透平）直接带动压气机。50Whenthedirectionhandleofthetelegraphismoved,therelativepositionofcamshaftandcrankshaftwillbe.A.changedaccordinglyB.unchangedC.positionedaheadD.positionedastern答案A当车钟的转向手柄被移动，凸轮轴和曲轴的相对位置也会因此发生改变。58ThedifferencebetweenFixedpitchpropeller（FPP）andControllablepitchpropeller（CPP）isinthat.A. forFP,oncefitted,thepositionofthebladescanalsobechangedinoperationforCP,oncefitted,thepositionofthebladescanalsobechangedinoperationtheCPtypehasarelativelysmallerhubcomparedwiththeFPpropellers.theFPtypehasarelativelylargerhubcomparedwiththeCPpropellers.答案B固定螺距螺旋桨和可调螺距螺旋桨的区别是：对于可调螺距螺旋桨来说，在工作过程中，桨叶的位置是可以改变的。63Acommonrailenginehasonlyoneortwohighpressurepumpsinoperationatthesametime,andtheinjectionintoeachcylinder.cantbecontrolledverypreciselycantbecontrolledasflexiblyastheseparatepumpsystemcanbecontrolledasflexiblyastheseparatepumpsystemcanbecontrolledmorepreciselyandflexibly答案D共轨柴油机仅使用一个或两个高压泵供油给所有气缸，喷油可以被控制的更精确和更灵活。65Tomeetthemarketrequirements,amarinedieselengineshouldnotbeof.A. bigsizeB.fueleconomyC.lowspeedD.highpower答案A为了满足市场的需求，船用柴油机尺寸不能过大。69isnotafeatureoftheelectroniccontrolledengines.A.LowerfuelconsumptionB.BetterbalancedcylinderpowerC.AshorteroverhaulperiodD.Lesssmokeemission答案B各缸功率更平衡不是电控柴油机的特色。76Thedefectiveplaceinthefurnaceshouldbewithfirebricks.A. pavedB.cleanedC.weldedD.dismantled答案A炉膛内有缺陷的部位应当砌上耐火砖85Whatisthefirstthingyouwouldcheckontakingoverawatch?thebilgesB.theperiscopeC.thewaterlevelD.theoilpressure答案C你在接班时首先会检查什么呢？（水箱、水柜）水位95Whentheheatloadbeginstoincrease,theneedlevalveofanexpansionvalvewillA.moveinanopeningdirectionB.moveinaclosingdirectionC.eitheropenorcloseD.notmoveatall答案A当热负荷开始增加时，热力膨胀阀的针阀会开大。97Thethermostaticvalvehasathrottlingaction,thatistosaythevalvecan.stoptherefrigerantfromflowingB.forcetherefrigeranttoflowC.causetherefrigerantpressuretoriseD.causetherefrigerantpressuretofall答案C（答案似乎错，应为D）热力膨胀阀有一个节流的动作（关小），即阀会造成制冷剂压力降低。100Ifthecompressorrunscontinually,thecausemightbethe.high-pressurecutoutswitchisjammedopenlow-pressureswitchisjammedshutthermalbulbisnotoperatingproperlyscaletrapisclogged答案A（答案似乎不正确，工作正常的压缩机起停与高压继电器无关）如果制冷压缩机持续运转，可能的原因是高压继电器卡死在了开启的位置。109Ifthetemperatureintheiceboxistoohigh,thetroublecouldbe.acloggedscaletrapB.airinthesystemC.automaticcontrolsnotfunctioningproperlyinsufficientcoolingwatertothecondenser答案C如果冷库库温过高，可能的原因是自动控制装置运转不正常。110IfnogasketsareusedinthepipingjointsofaFreonsystem,thejointsmustbe.A.finishedjointsB.weldedjointsC.groundjointsD.solderedjoints答案C如果氟利昂系统的管路接头不使用垫圈的话，那这些接头一定是磨口接头。115TheexpansionvalveonaFreonsystemcontrolsthe.A.superheatofthegasleavingthecompressorbackpressureintheevaporatortemperatureoftheiceboxsuperheatofthegasleavingtheevaporator答案D氟利昂系统的膨胀阀控制着离开蒸发器的冷剂气体的过热度。116Thescaletrapislocatedbetweenthe.kingvalveandthee