小学六年级英语汇总(介词)范文

勿忘国耻当思国运.抚今追昔,百感化作一念：当苦日子离去的时间越久远,当富日子光临的越急匆,我们心系国家、民族的命运thesamedirectionofrotation90°or180°for;aftereachdiscrotorwhenmeasuringpositionalignmentofthetwohalfcouplingconstant,shouldalsobeintermsofaccuracyandconsistency.Surfacedeviationmeasurement,mustinevery180degreescorrespondingtothetworadiiareequaltoeachotherinordertoeliminateerrorscausedbymovementoftherotor.Onlyasupportbearingoftherotor,WAcouplings,suchastheuseoftemporaryleavetheCenter,shouldpayattentiontokeeptherotorinthemeasuringprocessinthecenterofthebearingoilretainingthenestdoesnotchange.Steamoilblock,thereshouldbesufficientclearancebetweentherotorand,inrotorsmakesurerotorisnotontheblockorsealoil.Atthetimeofmeasurement,connectionsarenotallowedbetweentworotors,eachinafreeState.Notallowedincaseofassembledsleeve,Centerworkonthetoothedcoupling.Couplingtoolshouldhaveadequatestiffness,installationmustbesecureandreliable.CouplingCenterusingadialindicator,thetableshouldbeputinprisonandavoidtouching,toensurecorrectmeasurement.Couplingdiscafteraweektoreturntotheoriginalposition,circumferenceofdialgaugereadingshouldbeabletogobacktotheoriginalvalue.Whenmeasuringtheclearanceofend,intothefeelerofthegapshouldnotexceedfouratatime,whenthegapistoolarge,youcanusethegasketwiththefeelergaugemeasurementofgaugeblocksorfinishing.bearingsurface,markupshouldbeinaccordancewiththemountingsupportpads,andretestthethickness.Oncetheliftingcylindermeasurementofsurfaceandinternalcylindersurfaceheightdifference,comparedwiththeoriginalvaluesconfirmthelocation.Internalverticalandhorizontalcylinderunderstatekeyinsertioninstallationcomplexmeasuringcylinderinaxialposition.Bottom容易混淆的介词：区别讲解例句表时间的介词at,on,inat表示“在几点几分”（单位最小）；on表示“在具体的某一天或某天上午（下午晚上等）”；in表示“在几天、周、月、年”。Igetupatsixo’clock.Ithappenedonaspringmorning.Therearesevendaysinaweek.inthemorning/evening/afternoon；atnoon/night/dawn/sunrise/sunset/lunch/dinner/supper,etc.during,for,infor后加一个“表时间段的具体单位（常用复数）”；during强调“持续”或“某活动”期间；in指在一段时间内。Shehaslivedhereforsixyears.HewasinTianjinduringtheholidays.Inthosedayshewaspoor.till,untiltill/until构成的短语修饰“持续性动词”，“非持续性动词”要用“否定式”。Theywaitedtill/until10:00.Theydidn’tleaveuntil/till10:00.after,since“after+时刻或时段”，“…以后”，终点时间在过去或将来；而“since+时间点”，“自从…以来”，终点在说话的时刻。She’llbebackaftereighto’clock.She’slivedheresince2002.in,after“in+时段”，“…以后”，用于将来时；“after+时刻或时段”，“…以后”可用于将来时或过去时。He’llleaveafter11:00.Heleftafter11:00.Sheleftafterafewhours.She’llbebackinhalfanhour.表空间位置及方向方位的介词at,on,inat指一个“点”或“小地方”；in指一个“地区”或“大地方”空间内；on在某一平面或线上面。Theyarrivedatthevillageatten.Yourpencilisinthedesk.Yourpencilisonthedesk.on,above,overon“与物体接触”反义词为“beneath”；over“在…正上方”反义为“under”；above“在…的上方”反义词为“below”。There’sabookonthedeskandapenbeneaththebook.There’salampoverthedeskandabagunderthetable.Jack’sbedroomisabovemineonthesecondfloor.over,across,throughacross“表面跨过”；through“从中间或从头至尾穿过”；over“从上空越过”。He’sswimmingacrosstheriver.Theywalkedthroughthegate.Aplaneisflyingoverthecity.Heiswalkingoverthebridge.at,beside,by,at靠得“最近”；Let’smeetattheschoolgate.勿忘国耻当思国运.抚今追昔,百感化作一念：当苦日子离去的时间越久远,当富日子光临的越急匆,我们心系国家、民族的命运thesamedirectionofrotation90°or180°for;aftereachdiscrotorwhenmeasuringpositionalignmentofthetwohalfcouplingconstant,shouldalsobeintermsofaccuracyandconsistency.Surfacedeviationmeasurement,mustinevery180degreescorrespondingtothetworadiiareequaltoeachotherinordertoeliminateerrorscausedbymovementoftherotor.Onlyasupportbearingoftherotor,WAcouplings,suchastheuseoftemporaryleavetheCenter,shouldpayattentiontokeeptherotorinthemeasuringprocessinthecenterofthebearingoilretainingthenestdoesnotchange.Steamoilblock,thereshouldbesufficientclearancebetweentherotorand,inrotorsmakesurerotorisnotontheblockorsealoil.Atthetimeofmeasurement,connectionsarenotallowedbetweentworotors,eachinafreeState.Notallowedincaseofassembledsleeve,Centerworkonthetoothedcoupling.Couplingtoolshouldhaveadequatestiffness,installationmustbesecureandreliable.CouplingCenterusingadialindicator,thetableshouldbeputinprisonandavoidtouching,toensurecorrectmeasurement.Couplingdiscafteraweektoreturntotheoriginalposition,circumferenceofdialgaugereadingshouldbeabletogobacktotheoriginalvalue.Whenmeasuringtheclearanceofend,intothefeelerofthegapshouldnotexceedfouratatime,whenthegapistoolarge,youcanusethegasketwiththefeelergaugemeasurementofgaugeblocksorfinishing.bearingsurface,markupshouldbeinaccordancewiththemountingsupportpads,andretestthethickness.Oncetheliftingcylindermeasurementofsurfaceandinternalcylindersurfaceheightdifference,comparedwiththeoriginalvaluesconfirmthelocation.Internalverticalandhorizontalcylinderunderstatekeyinsertioninstallationcomplexmeasuringcylinderinaxialposition.Bottomnextto,nearbeside“在并排一条线上”；by“在并排一条线上”；nextto“在顺序上紧靠旁边”；near靠得“最远”，不表明确方向或顺序。Thebuildingbesidethelibraryistheshoppingcenter.TheboystandingbymysideisfromShanghai.Who’ssittingnextto/besideMr.Steve?about,round,around.about表示周围是随意的，不规则的；round或around(二者无多大差别)的周围则是较完整的一个圈。Don’tleavethetoysaboutthemeeting-room.Theyaresittinground/aroundthetable.to,for,atto“运动的方向，目的地”；for“动身出发的目的地”；at“有意攻击的目标”。Throwittome.He’llleaveforSha