第1題Comparedwithmechanicaltransmission,theadvantageofhydraulictransmissionisthat（

）.AitcanconvenientlyachievesteplessspeedregulationBithashighefficiencyCitrequireslowprocessingaccuracyDitmovessmoothly第2題Sincetheworld'sfirsthydraulicpresswasinvented,hydraulictransmissionhasahistoryofmorethan（

）years.A200B150C100D50第1題Theflowratecalculatedbasedonthegeometricdimensionsofthepumpintheabsenceofleakageiscalledthe（

）.AtheoreticalflowrateBactualflowrateCratedflowrateDdisplacement第2題Intheinternalleakagepathoftheexternalgearpump,thebiggestinfluenceonthevolumetricefficiencyisthe（

）.AaxialclearancebetweenthegearendfaceandtheendcoverBgapleakageofthetoothmeshingpointCradialgapbetweenthetoothtopandtheshellDgapbetweentheshellandtheendcover第3題Thedisplacementofthegearpumpisadjustable.第4題Ingearpumps,toeliminatethephenomenonoftrappedoil,anunloadinggrooveisopenedontheendcoverofthepump.1.3第1題Themovementspeedofthehydrauliccylinderdependsonthe（

）.AflowrateBpressureCintensityofpressureDflowrateandpressure第2題Thesealingqualityofahydrauliccylinderhasnoimpactonitsworkingperformance.1.4第1題M-typemedianfunctionofthereversingvalvecanachievemedianunloading.第2題Allreversingvalvescanbeusedinreversingcircuits.第3題Thenumberofworkingpositionsofadirectionalcontrolvalveiscalled"through".第4題Themiddlepositionofthesolenoidvalveusedasthepilotvalveintheelectro-hydraulicdirectionalcontrolvalveis（

）AYpositionBOpositionCHpositionDMpositionDrawthereversinglooponthesimulationsoftware第1題2.1第1題Therotorofasingle-actingvanepumpsucksoilandpressurizesoil（

）eachtimeitrotates.AonceBtwiceCthreetimesDfourtimes第2題ThebladeinclinationAngleofthedouble-actingvanepumpshouldbe（

）alongtherotationdirectionoftherotor.AinclinedforwardBinclinedbackwardCeitherforwardorbackwardDthesame第3題Thesingle-actingvanepumpcanchangetheoutputflowratebyalteringtheeccentricdistancebetweentherotorcenterandthestatorcenter第4題Eachtimetherotorofthedouble-actingvanepumprotatesonefullcircle,eachsealedvolumecompletestwooilsuctionandoilpressureprocesses.2.2第1題Theflowratecalculatedbasedonthegeometricdimensionsofthepumpintheabsenceofleakageiscalledthe（

）.AtheoreticalflowrateBactualflowrateCratedflowrateDdisplacement2.3第1題Auxiliarycomponentscanbepresentorabsentinthehydraulicsystem.第2題Thereturnoilpipeopeninginthefueltankshouldbecutata（

）toincreasetheflowarea.A45-degreeB30-degreeC60-degreeD80-degree2.4第1題Whenaone-wayvalveisusedasabackpressurevalve,itsspringshouldbereplacedwithasoftspring.第2題Whentheoilportofthehydrauliccontrolone-wayvalvedoesnotpassthroughthepressureoil,itsroleisthesameastheone-wayvalve第3題Aone-wayvalvecanbeusedtochangethedirectionoftheliquidflow.2.5第1題Theoverflowvalveservesasasafetyvalveinthe（

）pumpoilsupplysystem.AvariableBquantitativeCone-wayDbidirectional第2題Theoverflowvalvebelongstothe（

）controlvalve.ApressureBflowCdirectionalDspeed第3題Thepressureattheoiloutletoftheoverflowvalveisthesystempressure.第4題Iftheoverflowvalveisusedasasafetyvalve,itwillremaininanormallyclosedstatewhenthesystemisoperatingnormally.3.1第1題Forauxiliarydevicesofmachinetools(suchasfeedingandclamping),（

）areusuallypreferredashydraulicpumps.AgearpumpsBvanepumpsCplungerpumpsDscrewpumps第2題Plungerpumpscangenerallybeusedas（

）.AvariablepumpsBfixeddisplacementpumpsClow-pressurepumpsDsingle-directionpumps第3題（

）canbeusedinthehydraulicsystemsofmechanicalequipmentwithlargeloadsandhighpower.APlungerpumpsBGearpumpsCVanepumpsDScrewpumps第4題Theplungerhydrauliccylinderisdouble-acting.3.2第1題Thepressurereducingcircuitisusedtoincreasethepressureofacertainbranchinthesystemtobehigherthanthatoftheoilsource.第2題Thesmallerthepressurereducinggapinthepressurereducingvalveis,theweakeritspressurereducingeffectwillbe.第3題Theoilinletpressureofthepressurereducingvalveislowerthantheoiloutletpressure.第4題Liketheoverflowvalve,theoutletpressureofthepressurereducingvalveisequalto0.3.3第1題Thespeedcontrolvalveiscomposedof（

）andapressurereducingvalveinseries.AanadjustablethrottlevalveBaoverflowvalveCapressurereducingvalveDasequencevalve第2題Theflowcontrolvalveisusedtocontroltheworkingflowofthehydraulicsystem,therebycontrolling（

）.AthemovementspeedoftheactuatorBthemovementdirectionoftheactuatorCwhethertheactuatormovesornotDthepressureoftheactuator3.4第1題Themainhydrauliccomponentadoptedinthethrottlingspeedregulationcircuitisthe（

）.AthrottlevalveBsequencevalveCoverflowvalveDcheckvalve第2題Thespeedcontrolvalvecanmeettheoccasionswithhighrequirementsforspeedstability第3題Thespeedcontrolcircuitcomposedoftwospeedregulatingvalvescanonlyconnectthetwovalvesinparallel.第4題Thereisnobackpressureinthebypassthrottlingspeedregulationcircuit.4.1第1題Sequencevalvescanbeusedasoverflowvalves.第2題Theopeningandclosingofthevalvecoreofthehydraulicsequencevalveisnotcontrolledbythepressureattheoilinlet.4.3第1題Acircuitthatusesapressurecontrolvalvetoregulatethepressureofasystemoracertainpartofthesystemiscalled（

）.AapressurecontrolcircuitBaspeedcontrolcircuitCadirectionalcontrolcircuitDasequentialactioncircuit第2題Theunloadingcircuit（

）.Acanreducepowerloss,wearandsystemheatingBcanonlyberealizedbyapressurecontrolvalveCcanenablethesystemtoobtainarelativelylowandstableworkingpressure4.4第1題Thesequentialactioncircuitcanonlyberealizedbythetravelvalve.5.1第1題Thethrottlespeedregulationmethodofthesecondaryfeedoilinletcircuitwithparallelspeedcontrolvalvesadoptedbythepower