項(xiàng)目一任務(wù)一發(fā)動(dòng)機(jī)總體構(gòu)造及安全操作規(guī)程Item1Task1Useofcommontoolsandmeasuringtoolsforautomobileengines一.判斷題（對(duì)“√”，錯(cuò)“×”）（41題）Ⅰ.Trueorfalsequestions（True“√”,false“×”）（41questions）1.汽車(chē)的動(dòng)力源是起動(dòng)機(jī)。（）1.Thepowersourceofthecaristhestarter.()2.活塞環(huán)包括氣環(huán)和水環(huán)兩種。（）2.Pistonringincludestwokindsofgasringandwaterring.()3.曲柄連桿機(jī)構(gòu)由機(jī)體組、活塞連桿組和曲軸飛輪組等三部分構(gòu)成。（）3.Thecrankconnectingrodmechanismiscomposedofthreeparts:bodygroup,pistonconnectingrodgroupandcrankshaftflywheelgroup.()4.四沖程發(fā)動(dòng)機(jī)的工作循環(huán)包括四個(gè)活塞行程，即進(jìn)氣、作功、和排氣。（）4.Theworkingcycleofafour-strokeengineconsistsoffourpistonstrokes,namely,intake,work,andexhaust.()5.在安裝氣環(huán)時(shí)，各個(gè)氣環(huán)的切口應(yīng)該錯(cuò)位。（）5.Wheninstallinggasrings,thecutsofeachgasringshouldbemisaligned.()6.氣門(mén)式配氣機(jī)構(gòu)由氣門(mén)組和氣門(mén)起動(dòng)組組成。（）6.Thevalvevalvemechanismiscomposedofavalvegroupandavalvestartinggroup.()7.氣門(mén)彈簧座是通過(guò)安裝在氣門(mén)桿尾部的凹槽或圓孔中的鎖片或鎖銷(xiāo)固定的。（）7.Thevalvespringseatisfixedbyalockpieceorlockpininstalledinthegrooveorroundholeattheendofthevalverod.()8.強(qiáng)制冷卻水在發(fā)動(dòng)機(jī)內(nèi)進(jìn)行循環(huán)的裝置是水泵。（）8.Thedevicethatforcesthecoolingwatertocirculateintheengineisthepump.()9.發(fā)動(dòng)機(jī)的曲柄連桿機(jī)構(gòu)采用壓強(qiáng)潤(rùn)滑和飛濺潤(rùn)滑相結(jié)合的潤(rùn)滑方式。（）9.Thecrankconnectingrodmechanismoftheengineadoptsthelubricationmethodcombiningpressurelubricationandsplashlubrication.()10.機(jī)油泵常見(jiàn)的結(jié)構(gòu)形式有齒輪式和轉(zhuǎn)子式機(jī)油泵。（）10.Thecommonstructureofoilpumpisgeartypeandrotortypeoilpump.()11.活塞環(huán)有“三隙”：間隙、背隙和端隙。（）11.Thepistonringhas"threegaps":clearance,backclearanceandendclearance.()12.一般水冷式發(fā)動(dòng)機(jī)的冷卻水溫最佳范圍為25—35℃。（）12.Thebestrangeofcoolingwatertemperatureofgeneralwater-cooledengineis25-35℃.()13.曲軸變形，主要是指曲軸的彎曲變形。（）13.Crankshaftdeformation,mainlyreferstothebendingdeformationofthecrankshaft.()14.將油箱中的燃油吸出來(lái)并送到燃油分配管中的元件是活塞。（）14.Theelementthatsucksthefueloutofthetankandsendsittothefueldistributionpipeisthepiston.()15.檢查曲軸的彎曲度，一般是檢查曲軸的圓跳動(dòng)量。（）15.Checkthecurvatureofthecrankshaft,generallycheckthecircularrunoutofthecrankshaft.()16.汽油機(jī)常見(jiàn)的燃燒室形狀有盤(pán)形球形兩種類(lèi)型。（）Thecommoncombustionchambershapeofgasolineenginehastwotypesofdiscshapeandballshape.()17.曲軸的裂紋多發(fā)生在曲軸臂與軸柄頸之間的過(guò)渡圓角處及油孔處。（）17.Thecracksofcrankshaftmostlyoccuratthetransitioncornersandoilholesbetweenthecrankshaftarmandtheshafthandleneck.()18.氣缸磨損程度的技術(shù)狀祝是發(fā)動(dòng)機(jī)是否需進(jìn)行總成修理的決定性標(biāo)志。（）Thetechnicalindicationofthedegreeofcylinderwearisadecisiveindicatorofwhethertheengineisinneedofassemblyrepair.()19.活塞的最大磨損部位一般是群部。（）Thelargestwearpartofthepistonisgenerallygrouppart.()20.活塞銷(xiāo)與活塞銷(xiāo)座孔及連桿小頭的連接方式有全浮式和沉浸式兩種。（）20.Thepistonpinandthepistonpinseatholeandtheconnectingrodsmallheadareconnectedintwoways:fullfloatingandimmersion.()21.非增壓發(fā)動(dòng)機(jī)在進(jìn)氣結(jié)束時(shí)，氣缸內(nèi)壓力小于外界大氣壓。（）21.Attheendofintake,thepressureinthecylinderislessthantheexternalatmosphericpressure.()22.發(fā)動(dòng)機(jī)在排氣結(jié)束時(shí)，氣缸內(nèi)壓力小于外界大氣壓。（）22.Attheendoftheexhaustoftheengine,thepressureinthecylinderislessthantheoutsideatmosphericpressure.()23.點(diǎn)火系統(tǒng)將低壓變?yōu)楦邏菏怯牲c(diǎn)火線圈和斷電器共同完成的。（）23.Theignitionsystemchangesthelowpressureintohighpressurebytheignitioncoilandthebreaker.()24.曲軸正時(shí)齒輪是由凸輪軸正時(shí)齒輪驅(qū)動(dòng)的。（）24.Thecrankshafttiminggearisdrivenbythecamshafttiminggear.()25.離心式點(diǎn)火提前裝置是在發(fā)動(dòng)機(jī)負(fù)荷一定,發(fā)動(dòng)機(jī)轉(zhuǎn)速發(fā)生變化時(shí)起作用,真空式點(diǎn)火提前機(jī)構(gòu)是發(fā)動(dòng)機(jī)轉(zhuǎn)速一定,負(fù)荷發(fā)生變化時(shí)起作用（）25.Centrifugalignitionadvancedeviceworkswhentheengineloadisfixedandtheenginespeedchanges,andvacuumignitionadvancemechanismworkswhentheenginespeedisfixedandtheloadchanges()26.壓縮比等于氣缸工作容積與燃燒室容積的比值。（）26.Thecompressionratioisequaltotheratiooftheworkingvolumeofthecylindertothevolumeofthecombustionchamber.()27.為防止缸蓋變形,擰緊缸蓋螺栓的步驟是先中間、后四周,一次性按規(guī)定力矩?cái)Q緊。（）27.Topreventdeformationofthecylinderhead,thestepsfortighteningthecylinderheadboltsaretostartinthemiddleandthenaround,andtightenatonceaccordingtothespecifiedtorque.28.蠟式節(jié)溫器失效后無(wú)法修復(fù),應(yīng)按照其安全壽命定期更換。（）28.Thewaxthermostatcannotberepairedafterfailureandshouldbereplacedregularlyaccordingtoitssafelife.()29.曲桿連柄機(jī)構(gòu)是在高溫、高壓以及有化學(xué)腐蝕的條件下工作的。（）29.Thecrankandhandlemechanismworksunderhightemperature,highpressureandchemicalcorrosion.()30.氣門(mén)間隙是指氣門(mén)與氣門(mén)座之間的間隙。（）30.Thevalveclearancereferstotheclearancebetweenthevalveandthevalveseat.()31.凸輪軸的轉(zhuǎn)速比曲軸的轉(zhuǎn)速快一倍。（）31.Thespeedofthecamshaftistwicethatofthecrankshaft.()32.過(guò)量空氣系數(shù)越大,則可燃混合氣的濃度越濃。（）32.Thegreatertheexcessaircoefficient,thegreatertheconcentrationofthecombustiblemixture.()33.蠟式節(jié)溫器失效后,發(fā)動(dòng)機(jī)易出現(xiàn)過(guò)熱現(xiàn)象。（）33.Afterthewaxthermostatfails,theengineispronetooverheating.()34.汽車(chē)舉升機(jī)可按照形狀、功能及占用空間的不同進(jìn)行分類(lèi)。（）34.Carliftmachinecanbeclassifiedaccordingtoshape,functionandoccupyspace.()35.剪式汽車(chē)舉升機(jī)操作前即使車(chē)內(nèi)的行李物品重量很輕，也需將其搬出車(chē)外。（）35.Beforetheoperationofthescissorcarliftmachine,eveniftheluggageinthecarisverylight,itneedstobemovedoutofthecar.()36.剪式汽車(chē)舉升機(jī)下降操作時(shí)，直接按下“下降”按鈕即可完成下降操作。（）36.Whenthescissorcarliftmachineisdescending,thedescendingoperationcanbecompletedbypressingthe'down'buttondirectly.()37.清潔就是清掃。（）37.Cleaningissweeping.()38.修理汽油箱前，應(yīng)用專(zhuān)用溶液或水清除油箱內(nèi)的殘余油氣。但在清洗時(shí)不得吸煙，不得在旁邊烘烤零件或點(diǎn)燃噴燈。（）38.Beforerepairingthegasolinetank,applyspecialsolutionorwatertoremovetheresidualoilandgasinthetank.Butdonotsmokewhilecleaning,donotbakethepartsorlighttheblowtorchnexttoit.()39.蓄電池應(yīng)輕搬輕放，不可歪斜，以防電解液潑出腐蝕人體皮膚和衣服。（）39.Thebatteryshouldbecarriedlightlyandnottiltedtopreventtheelectrolytefromspillingoutandcorrodinghumanskinandclothes.()40.6S是指整理、整頓、清掃、清潔、素養(yǎng)、防護(hù)。（）40.6Sreferstofinishing,rectification,sweeping,cleaning,literacy,protection.()41.維修工具可以在實(shí)際工作中混用。（）41.Maintenancetoolscanbemixedinpracticalwork.()二.單選題（34題）Ⅱ.Multiplechoicequestions(Selectonlyoneanswerchoice)（34questions）1.發(fā)動(dòng)機(jī)工作時(shí)，曲軸的正時(shí)齒輪帶動(dòng)下列哪一個(gè)部件工作（）1.Whentheengineisworking,thetiminggearofthecrankshaftdriveswhichofthefollowingpartstowork()A.進(jìn)排氣凸輪軸B.飛輪C.噴油器D.節(jié)氣門(mén)A.IntakeandexhaustcamshaftB.FlywheelC.InjectorD.Throttlevalve2.在某些發(fā)動(dòng)機(jī)凸輪軸蓋上有時(shí)會(huì)標(biāo)有DOHC，那么DOHC是表示（）。2.DOHCissometimesmarkedonthecamshaftcoverofsomeengines,soDOHCstandsfor().A.單頂置凸輪軸B.雙頂置凸輪軸C.新型電噴發(fā)動(dòng)機(jī)D.缸內(nèi)噴射A.SingleoverheadcamshaftB.DoubleoverheadcamshaftC.NewtypeofelectronicfuelinjectionengineD.In-cylinderinjection3.學(xué)生a說(shuō)：在齒輪傳動(dòng)中，斜齒輪比正齒輪嚙合更為平穩(wěn)，噪聲更??；學(xué)生b說(shuō)：在拆裝發(fā)動(dòng)機(jī)的時(shí)候，配氣機(jī)構(gòu)的拆裝要觀察原機(jī)體上有沒(méi)有正時(shí)記號(hào)，沒(méi)有的話要認(rèn)真做好記號(hào)，備裝配的時(shí)候用。下列說(shuō)法正確的是（）3.Studentasaid:ingeartransmission,thehelicalgearmeshesmoresmoothlyandmakeslessnoisethanthespurgear;Studentbsaid:whendisassemblingtheengine,thedisassemblyandassemblyofthevalvemechanismshouldobservewhetherthereisatimingmarkontheoriginalbody,ifnot,itshouldbecarefullymadeamarkforassembly.Thefollowingstatementiscorrect()A.只有學(xué)生a正確B.只有學(xué)生b正確C.學(xué)生a和b都正確D.兩個(gè)都錯(cuò)誤A.Onlystudentaiscorrect B.OnlystudentBiscorrect C.Bothstudentsaandbarecorrect D.Botharewrong4.在電控發(fā)動(dòng)機(jī)的供油系統(tǒng)中，油壓調(diào)節(jié)器的作用是（）。4.Intheoilsupplysystemoftheelectronicallycontrolledengine,thefunctionoftheoilpressureregulatoris().A.控制燃油分配管中的壓力恒定A.ControltheconstantpressureinthefueldistributionpipeB.在節(jié)氣門(mén)開(kāi)度大時(shí)燃油壓力變小B.Whenthethrottleopeningislarge,thefuelpressurebecomessmaller.C.燃油壓力與進(jìn)氣管壓力之差保持恒定C.ThedifferencebetweenthefuelpressureandtheintakepipepressureremainsconstantD.進(jìn)氣管壓力大時(shí)燃油壓力小D.Whentheintakepipepressureislarge,thefuelpressureissmall5.現(xiàn)代汽車(chē)發(fā)動(dòng)機(jī)普遍采用多氣門(mén)結(jié)構(gòu)，其作用是為了（）5.Modernautomobileenginesgenerallyusemulti-valvestructure,itsroleisto()A.提高點(diǎn)火性能B.提高噴油性能C.減小爆震D.提高充氣效率A.ImproveignitionperformanceB.improvefuelinjectionperformanceC.reduceknockD.Improveinflationefficiency6.發(fā)動(dòng)機(jī)溫度過(guò)熱時(shí)，以下哪個(gè)描述是錯(cuò)誤的？（）6.Whichofthefollowingstatementsisfalsewhentheenginetemperatureisoverheated?()A.將使發(fā)動(dòng)機(jī)熄火困難A.willmakeitdifficulttostalltheengineB.將使汽油機(jī)爆燃或早燃B.willmakethegasolineenginedeflaggingorearlyignitionC.將使汽油機(jī)容易熄火C.willmakethegasolineengineeasytostallD.將使發(fā)動(dòng)機(jī)經(jīng)濟(jì)性變好D.willmaketheenginemoreeconomical7.正常工作的發(fā)動(dòng)機(jī)，其機(jī)油泵的限壓閥應(yīng)該是（）7.Thenormaloperationoftheengine,theoilpumppressurelimitingvalveshouldbe()A.經(jīng)常處于關(guān)閉狀態(tài)A.OftenintheclosedstateB.熱機(jī)時(shí)開(kāi)，冷機(jī)時(shí)關(guān)B.Whentheheatengineison,thecoldmachineisoffC.經(jīng)常處于溢流狀態(tài)C.OftenintheoverflowstateD.熱機(jī)時(shí)關(guān)、冷機(jī)時(shí)開(kāi)D.Whentheheatengineisoff,thecoldmachineison8.從各缸的進(jìn)、排氣凸輪軸的排列，我們可以判斷出發(fā)動(dòng)機(jī)的（）8.Fromthearrangementoftheinletandexhaustcamshaftofeachcylinder,wecanjudgethe()ofthestartingmotor.A.轉(zhuǎn)速B.工作順序C.氣門(mén)的遲閉角D.氣門(mén)的提前角A.SpeedB.WorkingsequenceC.LateclosingangleofthevalveD.Advanceangleofthevalve9.學(xué)生a說(shuō)：氣門(mén)彈簧折斷時(shí)，將會(huì)影響發(fā)動(dòng)機(jī)的工作，嚴(yán)重時(shí)會(huì)造成事故；學(xué)生b說(shuō)：氣門(mén)彈簧折斷時(shí)，進(jìn)排氣門(mén)可以開(kāi)啟得更快，增加進(jìn)排氣量。下列說(shuō)法正確的是（）9.Studentasaid:Whenthevalvespringisbroken,itwillaffecttheworkoftheengineandcauseaccidentsinseriouscases;Studentbsaid:Whenthevalvespringisbroken,theintakeandexhaustvalvescanbeopenedfastertoincreasetheintakeandexhaustvolume.Thefollowingstatementiscorrect()A.只有學(xué)生a正確B.只有學(xué)生b正確C.學(xué)生a和b都正確D.兩個(gè)都錯(cuò)誤A.Onlystudentaiscorrect B.OnlystudentBiscorrect C.Bothstudentsaandbarecorrect D.Botharewrong10.曲軸每旋轉(zhuǎn)兩圈，凸輪軸將旋轉(zhuǎn)多少圈（）10.Howmanyrevolutionswillthecamshaftrotateforeverytworevolutionsofthecrankshaft?A.兩圈 B.一圈C.三圈D.半圈A.Twoturns B.Oneturn C.Threeturns D.Halfacircle11.發(fā)動(dòng)機(jī)零件最主要的耗損形式是（）11.Themostimportantformofenginepartswearis().磨損 .腐蝕 .疲勞 .變形 B.corrosion C.fatigue D.deformation12.現(xiàn)代高級(jí)轎車(chē)多采用了液壓挺柱，我們將無(wú)需調(diào)整（）12.Modernluxurycarsmostlyusehydraulictappets,wewillnotneedtoadjust()A.點(diǎn)火順序 B.火花塞間隙 C.噴油量 D.氣門(mén)間隙A.ignitionsequence B.sparkplugclearance C.fuelinjectionquantityD.valveclearance13.學(xué)生a說(shuō)：活塞從上止點(diǎn)開(kāi)始至進(jìn)氣門(mén)完全關(guān)閉的曲軸轉(zhuǎn)角叫進(jìn)氣遲后角；學(xué)生b說(shuō)：從排氣門(mén)打開(kāi)至下止點(diǎn)所轉(zhuǎn)過(guò)的曲軸轉(zhuǎn)角叫排氣提前角。下列說(shuō)法正確的是（）13.Studentasaid:Thepistonangleofthecrankshaftfromtopdeadcentertotheintakevalvecompletelyclosediscalledtheintakelaterearangle;Studentbsaid:ThecrankshaftAnglerotatedfromtheopeningoftheexhaustvalvetothebottomdeadcenteriscalledtheexhaustadvanceangle.Thefollowingstatementiscorrect()A.只有學(xué)生a正確B.只有學(xué)生b正確C.學(xué)生a和b都正確D.兩個(gè)都錯(cuò)誤A.Onlystudentaiscorrect B.Onlystudentbiscorrect C.Bothstudentsaandbarecorrect D.Botharewrong14.學(xué)生a說(shuō)：由于進(jìn)、排氣門(mén)的早開(kāi)和遲閉，就會(huì)有一段時(shí)間內(nèi)進(jìn)、排氣門(mén)同時(shí)開(kāi)啟的現(xiàn)象，這種現(xiàn)象稱為氣門(mén)重疊，重疊的曲軸轉(zhuǎn)角稱為氣門(mén)重疊角；學(xué)生b說(shuō)：我們?cè)O(shè)置適宜的氣門(mén)重疊角，可以利用氣流壓差和慣性對(duì)燃燒室進(jìn)行掃氣，清除殘余廢氣，增加新鮮空氣充量。下列說(shuō)法正確的是（）14.Studentasaid:Duetotheearlyopeningandlateclosingoftheintakeandexhaustvalves,therewillbeaperiodoftimewhentheintakeandexhaustvalvesareopenedatthesametime.Thisphenomenoniscalledvalveoverlap,andtheoverlappingcrankshaftangleiscalledvalveoverlapangle;Studentbsaid:Wesetanappropriatevalveoverlapangle,whichcanmakeuseofairflowpressuredifferenceandinertiatosweepthecombustionchamber,removeresidualExhaustgas,andincreasefreshaircharge.Thefollowingstatementiscorrect()A.只有學(xué)生a正確B.只有學(xué)生b正確C.學(xué)生a和b都正確D.兩個(gè)都錯(cuò)誤A.Onlystudentaiscorrect B.Onlystudentbiscorrect C.Bothstudentsaandbarecorrect D.Botharewrong15.（）會(huì)引起發(fā)動(dòng)機(jī)的上、下、左、右振動(dòng)。15.()willcausetheupper,lower,leftandrightvibrationsoftheengine..氣體作用力.離心力.往復(fù)慣性力.摩擦力Frictionforce16.排氣門(mén)的錐角一般為（）16.Theconeangleoftheexhaustvalveisgenerally()A．30°B．45°C．60°D．50°17.氣壓檢驗(yàn)法檢測(cè)氣門(mén)密封性時(shí)，儲(chǔ)氣筒內(nèi)氣壓值，在0.5分鐘內(nèi)氣壓值降低至少不大于（），說(shuō)明氣門(mén)密封性良好。17.Whenthevalvesealingisdetectedbythepressuretestmethod,thepressurevalueinthegasstoragecylinderisreducedbyatleastnotmorethan()within0.5minutes,indicatingthatthevalvesealingisgood.A.10%B.15%C.20%D.25%18.下述各零件不屬于氣門(mén)驅(qū)動(dòng)組的是（）。18.Thefollowingpartdonotbelongtothevalvedrivegroupisthe().A.正時(shí)鏈條B.凸輪軸正時(shí)齒輪C.曲軸正時(shí)齒輪D.凸輪軸A.timingchain B.camshafttiminggear C.crankshafttiminggear D.camshaft19.發(fā)動(dòng)機(jī)氣缸磨損的檢驗(yàn)，主要測(cè)量其（）19.Enginecylinderweartest,mainlymeasureits().直線度和同軸度.平行度和平面度parallelismandplanarity.垂直度和圓跳動(dòng).圓度和圓柱度Roundnessandcylindricity20.凸輪軸上凸輪的輪廓的形狀決定于（）。20.TheshapeofthecontouroftheCAMonthecamshaftisdeterminedby().A.氣門(mén)的升程B.氣門(mén)的運(yùn)動(dòng)規(guī)律C.氣門(mén)的密封狀況D.氣門(mén)的磨損規(guī)AvalveliftB.valvemotionlawC.valvesealstatusD.weargaugeforvalve21.活塞與氣缸壁之間的潤(rùn)滑方式是（）。.壓力潤(rùn)滑.飛濺潤(rùn)滑.脂潤(rùn)滑.壓力潤(rùn)滑和飛濺潤(rùn)滑同時(shí)進(jìn)行pressurelubricationandsplashlubricationareperformedsimultaneously22.機(jī)油粗濾器上裝有旁通閥，當(dāng)濾芯堵塞時(shí)，旁通閥打開(kāi)（）。22.Thecrudeoilfilterisequippedwithabypassvalve.Whenthefilterelementisblocked,thebypassvalveopensto.使機(jī)油不經(jīng)過(guò)濾芯，直接流回油底殼A.allowtheoiltoflowdirectlybacktotheoilpanwithoutpassingthroughthefilterelement.使機(jī)油直接進(jìn)入細(xì)濾器B.allowtheoiltodirectlyenterthefinefilter.使機(jī)油直接進(jìn)入主油道C.allowtheoildirectlyentryintothemainoilpassage.使機(jī)油流回機(jī)油泵D.allowoiltoflowbackintotheoilpump23.（）是汽車(chē)的動(dòng)力裝置？23.()isthepowerplantofthecar?.車(chē)身.底盤(pán).電器設(shè)備.發(fā)動(dòng)機(jī)24.發(fā)動(dòng)機(jī)氣門(mén)間隙過(guò)大會(huì)造成氣門(mén)腳異響,可用（）來(lái)進(jìn)行測(cè)量氣門(mén)間隙。24.Theenginevalveclearanceistoolargetocausethevalvefootabnormalsound,()canbeusedtomeasurethevalveclearance..扳手.卡尺.厚薄規(guī) D.外徑千分尺 D.outermicrometer25.進(jìn)、排氣門(mén)在排氣上止點(diǎn)時(shí)（）。25.Whentheintakeandexhaustvalvesareattheexhausttopdeadcenter().A.進(jìn)氣門(mén)開(kāi),排氣門(mén)關(guān)B.排氣門(mén)開(kāi),進(jìn)氣門(mén)關(guān)A.Intakevalveopen,exhaustvalveclosedB.Exhaustvalveopen,intakevalveclosedC.排氣門(mén)全關(guān)D.進(jìn)、排氣門(mén)開(kāi)C.Exhaustvalvesareclosed.D.Intakeandexhaustvalvesareopened26.四沖程發(fā)動(dòng)機(jī)的有效行程是指（）。26.Theeffectivestrokeofafour-strokeenginerefersto().A.壓縮行程B.作功行程C.排氣行程D.進(jìn)氣行程。A.compressionstrokeB.workstrokeC.exhauststrokeD.intakestroke.27.下述各零件不屬于氣門(mén)傳動(dòng)組的是（）。27.Thefollowingpartdonotbelongtothevalvedrivegroupis().A.氣門(mén)彈簧B.挺柱C.搖臂軸D.凸輪軸A.valvespringB.tappet C.rockerarmshaft D.camshaft28.發(fā)動(dòng)機(jī)的壓縮比是指（）之比。28.Thecompressionratiooftheenginereferstotheratioof().A.氣缸總?cè)莘e與燃燒室容積A.Totalcylindervolum