轮机英语阅读理解

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1、Thissequenceofeventsismadepossiblebysubstitutingportsinthebottomofthecylinderwallfortheinletandexhaustvalves.Therearetwogroupsoftheseports,oneforexhaustandtheotherforscavengingair,usuallyontheoppositesidesofthecylinder,butinsomedesignsbothgroupsarcarrangedonth

2、esameside.Theexhaustportsconnectwiththeexhaustmanifold,whilethescavengingportscommunicatewiththescavengingairreceiverinwhichlow-pressureairisstored.Theexhaustportsareslightlyhigherthanthescavengingports,sothattheyareuncoveredbythepistonwhilethescavengingportsa

3、restillclosed・LFromtheparagraphabove,weknowthat.4Ingeneral,bothexhaustportsandscavengingairportsareontheoppositesidesofthecylinde「B.Theexhaustportsareontheoppositesides,butthescavengingairportsareonthesamesidesC.Thescavengingairportsareontheoppositesides,butth

4、eexhaustportsareonthesamesidesD.Twogroupsofpartsareneverarrangedonthesamesides2.Accordingtotheaboveparagraphtheexhaustportslinkwith・A.theexhaustvalvesB.thescavengingairreceiversC.theexhaustmanifoldD.thescavengingportsTheengineisalsoprovidedwithagovernorwhichis

5、designedtoregulatetheengine'sspeedbyadjustingthequantityofoilinjected.Whentheenginerunsataspeedhigherorlowerthanthatisset,thegovernorwillactautomaticallyreduceorincreasethefueloilsupplysothattheenginecanbeadjusted・3.Fromthisparagraphwecanunderstandthat•A.ifthe

6、enginerunsataspeedhigherthanthatisset,thegovernorwillincreasethefueloilsupplyB.iftheenginerunsataspeedhigherthanthatisset,thegovernorwilldecreasethefueloilsupplyC.thegovernorwillnotactuntiltheenginerunsatspeedlowerthanthatissetD・thegovernorregulatestheengine1s

7、speedbyadjustingthefueloilinjection4.Theenginegovernorisusedfor・A・adjustingthefueloilinjectionqualityB.adjustingtheenginespeedC・keepingtheengineathigherspeedD・keepingtheengineatlowerspeed5.Accordingtotheparagraphwhatdoes"which”referto?A.EngineB・GovernorC.Speed

8、D.ThequantityofoilinjectedBecausetheexhaustgasdriventurbo・blowercannotprovideenoughairatlowenginespeeds,thepressurizedairshouldbecooledtoincreasethechargeairdensity.Astheairpassest