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Theengineisalsoprovidedwithagovernorwhichisdesigned第4题toregulatetheengine'sspeedbyadjustingthequantityofoilinjected.第3题Whentheenginerunsataspeedhigherorlowerthanthatisset,thegovernorwillactautomaticallyreduceorincreasethefueloilsupplysothattheenginecanbeadjusted.3.Fromthesecondparagraphwecanunderstandthat_____.A.iftheenginerunsataspeedhigherthanthatisset,thegovernorwillincreasethefueloilsupplyB.iftheenginerunsataspeedhigherthanthatisset,thegovernorwilldecreasethefueloilsupplyC.thegovernorwillnotactuntiltheenginerunsatspeedlowerthanthatissetD.thegovernorregulatestheengine'sspeedbyadjustingthefueloilinjection注：如果发动机转速高于设定值，调速器要降低燃油供应量。4.Theenginegovernorisusedfor_____.A.adjustingthefueloilinjectionqualityB.adjustingtheenginespeedC.keepingtheengineathigherspeedD.keepingtheengineatlowerspeed注：发动机的调速器被用来调节发动机速度5.Accordingtothesecondparagraphwhatdoeswhichreferto?A.EngineB.GovernorC.SpeedD.ThequantityofoilinjectedPassage8第二题Thelubricationsystemofanengineprovidesasupplyoflubricatingoiltothevariousmovingpartsinanengine.Its第三题mainfunctionistoenabletheformationofafilmofoilbetweenthemovingparts,whichreducesfrictionandwear.Thelubricatingoilisalsousedasacleanerandinsomeenginesasacoolant.第一题Theusualmethodofbearinglubricationisbyforcedfeedsystem,whichsuppliesoiltoallbearings,sothatafilmofoilismaintainedonthejournalandbearingsurfaces.1.Theforcedfeedsystemisputintouseinorderto_____.A.supplyoiltoallpartsoftheengineB.lubricatethebearingandthepistonC.maintainafilmofoilonthejournalandbearingsurfacesD.maintainafilmofoilonthepistonsurfacesonly注：强制供应系统被投入使用，为了在轴颈和轴承面上保持一层油膜。2.Accordingtothefirstparagraph,whatdoesitsreferto?A.thelubricationsystem'sB.lubricatingoil'sC.thevariousmovingparts'D.thepistonsurfaces'3.Whatisthefunctionoflubricatingoil?A.Formationofafilmofoilbetweenthemovingparts,whichreducesfrictionandwear.B.Usedasacleaner.C.Asacoolantinengines.D.Alloftheabove.注：滑油的作用有：在各运动部件之间形成一层油膜，减少摩擦和磨损。，用作清洁剂，也可以作为发动机里面的冷却剂。Freshwaterisusedforthecoolingofthecylinderjacketsandcoversofthemainengine,whereasthevariouscoolingliquidswhichcirculatetheenginearethemselvescooledbyseawater,suchas,seawaterisusedforthecoolingoftheoilinthelubricatingoilcooleraswellasthefreshwater.Inanemergencysituation,forexample第四题intheeventofdamagetoafreshwatercoolerorgenerator,theseawaterpumpscanbeusedtosupplyseawatertothefreshwatercoolingsystem,merelybyremovingtheblind-flanges.4.Inwhichsituationweshoulduseseawatersysteminsteadoffreshwatersystem?A.Whenseawaterpumpsaredamaged.B.Whenseawatercoolerisdamaged.C.Whenfreshwaterpumpsaredamaged.D.Theblind-flangesarebroken.注：当淡水泵损坏时，我们可以有海水系统代替淡水系统。5.Thewordmerelyinthisparagraphcouldbestbereplacedby_____.A.onlyB.necessaryC.butD.if注：merely意思是“仅仅”Passage9Becausetheexhaustgasdriventurbo-blowercannotprovideenoughairatlowenginespeeds,第二题thepressurizedairshouldbecooledtoincreasethechargeairdensity.Astheairpassesthroughthechargeaircooler,itstemperaturemaybereducedandmoisturecondensed,第一题withthecondensateindangerofbeingcarriedintotheengine.Soawaterseparatorshouldbemountedbeneaththebottompartoftheengineinletmanifold.1.Awaterseparatorisusedinorderto_____.A.keeptheairfrombeingcardedintotheengineB.keepthemoisturefrombeingcondensedC.keepthedangerfrombeingcardedintotheengineD.takeawaythecondensatefromtheair注：为了从空气中带走冷凝水，可以使用分水机。2.Whyshouldweuseachargeaircooler?A.Inordertoincreasethechargeairtemperature.B.Inordertoincreasethechargeairpressure.C.Inordertoreducemoisturecondensed.D.Inordertoincreasethechargeairdensity.注：为了增加空气的密度，可以使用空冷器。Lubricatingoilfromthecompressorwillpassalongtheairlinesanddepositonthem,第五题intheeventofacylinderairstartingvalveleaking,hotgaseswouldpassintotheairpipesandignitethelubricatingoil.Ifstartingairweresuppliedtotheengine,thiswouldfurtherfeedthefireandcouldleadtoanexplosioninthepipelines.第四题Inordertopreventsuchanoccurrence,cylinder-startingvalvesshouldbeproperlymaintainedandthepipelinesregularlydrained.Alsooildischargedfromcompressorsshouldbekepttoaminimum,bycarefulmaintenance.3.Whichofthefollowingmaycauseanexplosionaccordingtothepassage?A.Startingaircannotbesuppliedintotheengine.B.Airstartingvalveleaksandstartingairissuppliedintotheengine.C.Cylinder-startingvalvesareproperlymaintained.D.Oildischargedfromcompressorsiskepttoaminimum.注：空气气动阀泄漏，并且起动空气被继续供应到发动机中，可能会导致爆炸现象。4.Inordertoavoidignitingthelubricatingoilandleadingtoanexplosioninthepipelines,_____.A.pipelinesshouldberegularlydrainedB.cylinder-startingvalvesshouldbeproperlymaintainedC.oildischargedfromcompressorsshouldbekepttoaminimumD.A+B+C注：为了避免点燃滑油，导致管路中的爆炸现象发生，管路应该被定期放残，气缸气动阀应该进行适当的保养，从压缩机中排放的油应该被保持到一个最小值。5.FromtheparagraphmentionedabovewecanknowthatA.thelubeoilispassinganddepositingontheoiltransferringlineB.thehotgaseswillcertainlycausethelubeoiltobumC.thecompressormakesthelubeoilpassthroughthestartingvalveD.oncetheleakingofstartingvalveoccurs,hotgasesmaycausethelubeoiltobumintheairpipes注：一旦起动阀泄漏现象发生，高温气体会导致滑油在空气管路中燃烧。