复习题词汇与语法.docx

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1、复习题词汇与语法1、The______ofpistonmovementiscalledTDC(topdeadcenter).A、upperlimitB、lowerlimitC、limit2、The______ofpistonmovementiscalledBDC(bottomdeadcenter).A、lowerlimitB、upperlimitC、limit3、A_____ispistonmovementfromTDCtoBDCorfromBDCtoTDC.A、strokeB、stageC、state4

2、、The_____isrotatedasthepistonispusheddownbythepressureaboveit.A、crankshaftB、crankpinC、break5、Theactions______canbedividedintofourstages,orstrokes.A、takenplaceintheenginecylinderB、takingplaceintheenginecylinderC、takeplaceintheenginecylinder6、Inotherwords,t

3、hepistoncompletesastroke_____itchargesitsdirectionofmotion.A、everytimeB、eachtimeC、eachtimes7、”Stroke”______pistonmovement.A、refertoB、referstoC、preferto8、Astrokeoccurs_______thepistonmovesfromonelimitingpositiontotheother.A、whileB、whenC、which9、Bythetimethe

4、pistonreachesTDC,themixture________toaslittleasone-tenthofitsoriginalvolume,oroverless.A、hadbeencompressedB、hasbeencompressedC、compressed10、Whentheair-fuelmixtureiscompressed,________doesthepressureinthecylindergoup,______thetemperatureofthemixture_______

5、increases.A、notonly…butalsoB、notonly…butandC、not…but11、Thecylinderpressure________asmuchas3-5Mpaorevenmore.A、goupB、increasesC、add12.Butasthehigherpressuresiscalledupontowithstandverymuchgreaterstresseshigherpressuresincylinders.A.becauseB.becauseofC.dueto

6、13.Thedieselengineismoreefficient,becauseithighercompressionratio.A.haveB.hasC.had14.Thisadvantagepreventsthedieselenginereplacingthegasolineengineinsomeautomobilesandairplanes.A.toB.forC.from15.Inanyinternalcombustionengineburningfuelheatsairconsequently

7、.A.whichB.thatC.when16.Weallknowthatdieselengines()workinthesamewayasgasolineenginedo.A.inprincipleB.inotherwordsC.inturn17.Upto40percentofthechemicalenergyoftheburningfuelchangedintomechanicalenergy.A.willbeB.wouldbeC.maybe18.Asitwere,intowaitingchargeat

8、therequiredinstant.A.aB.anC.the19.Ithasmoresubstantialconstructionandisthusheavier.A.tobeofB.tobeC.tobethat20.Thesameseriesofeventstakeplaceagainandcontinuetheengineruns.A.whenB.asC.aslongas1.Whatdoweseefromtheparag