復(fù)習(xí)題詞匯與語法

復(fù)習(xí)題詞匯與語法

1、The______ofpistonmovementiscalledTDC(topdeadcenter).

A、upperlimitB、lowerlimitC、limit

2、The______ofpistonmovementiscalledBDC(bottomdeadcenter).

A、lowerlimitB、upperlimitC、limit

3、A_____ispistonmovementfromTDCtoBDCorfromBDCtoTDC.

A、strokeB、stageC、state

4、The_____isrotatedasthepistonispusheddownbythepressureaboveit.

A、crankshaftB、crankpinC、break

5、Theactions______canbedividedintofourstages,orstrokes.

A、takenplaceintheenginecylinderB、takingplaceintheenginecylinder

C、takeplaceintheenginecylinder

6、Inotherwords,thepistoncompletesastroke_____itchargesitsdirectionofmotion.

A、everytimeB、eachtimeC、eachtimes

7、”Stroke”______pistonmovement.

A、refertoB、referstoC、preferto

8、Astrokeoccurs_______thepistonmovesfromonelimitingpositiontotheother.

A、whileB、whenC、which

9、BythetimethepistonreachesTDC,themixture________toaslittleasone-tenthofitsoriginalvolume,oroverless.

A、hadbeencompressedB、hasbeencompressedC、compressed

10、Whentheair-fuelmixtureiscompressed,________doesthepressureinthecylindergoup,______thetemperatureofthemixture_______increases.

A、notonly…butalsoB、notonly…butandC、not…but

11、Thecylinderpressure________asmuchas3-5Mpaorevenmore.

A、goupB、increasesC、add

12.Butasthehigherpressuresiscalledupontowithstandverymuchgreaterstresses

higherpressuresincylinders.

A.becauseB.becauseofC.dueto

13.Thedieselengineismoreefficient,becauseithighercompressionratio.

A.haveB.hasC.had

14.Thisadvantagepreventsthedieselenginereplacingthegasolineengineinsomeautomobilesandairplanes.

A.toB.forC.from

15.Inanyinternalcombustionengineburningfuelheatsairconsequently.

A.whichB.thatC.when

16.Weallknowthatdieselengines()workinthesamewayasgasolineenginedo.A.inprincipleB.inotherwordsC.inturn

17.Upto40percentofthechemicalenergyoftheburningfuelchangedintomechanicalenergy.

A.willbeB.wouldbeC.maybe

18.Asitwere,intowaitingchargeattherequiredinstant.

A.aB.anC.the

19.Ithasmoresubstantialconstructionandisthusheavier.

A.tobeofB.tobeC.tobethat

20.Thesameseriesofeventstakeplaceagainandcontinuetheengineruns.

A.whenB.asC.aslongas

Whatdoweseefromtheparagraphs?()

A.Whatisstroke?B.Whatisengine?C.Whatiscylinder?

2.WhichoneStatementistrueaccordingtheabovefirstparagraph?()

A.Afour-stroke-cycleenginemeansthatfourstrokesisrequiredwhenitfinishthewholecycle.

B.AstrokeisnotpistonmovementfromTDCtoBDC,butfromBDCtoTDC.

C.ThelowerlimitofpistonmovementiscalledTDC(topdeadcenter).

3.WhatisBDCinthetermofautomobileindustry?()

A.Bottomdeadcenter.B.Topdeadcenter.C.NeitherofAandB.

4.WhichoneStatementisTRUEaccordingthelastparagraph?()

A.Thefourstrokesoccurintwocrankshaftrevolutions.

B.Thefourstrokesoccurinfourcrankshaftrevolutions.

C.Thefourstrokesoccurinonecrankshaftrevolutions.

5.WhichoneStatementisTUREaccordingthearticle?()

A.Thefourpistonstrokesareintake,compression,power,andexhaust.

B.Thefourpistonstrokesareintake,compression,power,andinhauls.

C.Thefourpistonstrokesareintake,combining,power,andexhaust.

1、Themixtureisdeliveredtotheengineitisburned.

AwhereBwhichCwho

2、Theenginerequiresafuelsystemtosupplyitamixtureofairandfuel.

AofBoffCwith

3、Themotioniscarriedthroughthepowertraintothecarwheelssothattheyrotateandthecarmoves.

ArotaryBrevolveCrevolution

4、thecylinderpressuretoasmuchas3－5MPa