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1、人教版九年级物理全册课件 压力和压强 PPT课件2.rar 压力和压强 PPT课件1.rar 物质的比热容 PPT课件.rar 物体的浮沉条件 PPT课件.rar 五、牛顿第一定律 PPT课件.rar 五、密度与社会生活 PPT课件.rar 五、滑轮 PPT课件3.rar 五、滑轮 PPT课件2.rar 五、滑轮 PPT课件1.rar 托里拆利实验测气压(flv视频).rar 天平的使用flash课件.rar 探究物质的密度.rar 四、杠杆 PPT课件4.rar 四、杠杆 PPT课件3.rar 四、杠杆 PPT课件2.rar 四、杠杆
2、 PPT课件1.rar 四、测量物质的密度Flash课件.rar 四、测量物质的密度 PPT课件2.rar 四、测量物质的密度 PPT课件1.rar 时间的测量 PPT课件.rarsideofroadsubgrade2m.Direct-buriedcableupperandlowershouldbecoveredwithnotlessthan100mmthicklayerofsoftsoilorsand,andaffixtheprotection,thecoverageshouldbewiderthan50mmoneachsideofthecable,coverplatec
3、anbeusedtoprotectconcreteorbrick.Direct-buriedcableinlineevery50-100meters,cableturnsshouldbeappreciablebearingflagsorstakes.Direct-buriedcablepriortobackfill,shallbesubjecttoacceptanceofconcealedworkbeforetheycanbefilled.4.1.54.1.5.1factoryofmakingcableterminalcablemainlyinthelow-voltagecable
4、head,dryPack,itsproductionshouldstrictlyabidebytheproductionprocess.4.1.5.2shouldchecktheinsulationbeforethefirstcableproductionqualified,low-voltagepowercableswith1000Vshaketable,itsinsulationvalueshouldnotbelessthanthespecifiedvalue.4.1.5.3makingcablehead,cutfromtheStripbeginscontinuousopera
5、tionuntilthecompletionofthecable,reducinginsulationexposuretime,strip-cutcables,insulationshouldnotdamageconductorsandreservations.Thearmoredpowercableandcontrolcableshieldshouldbeconnectedtoagoodshallnotbeinterrupted,and...Correctlypositioned,verticalclearanceshallbedistributedevenlypershellb
6、usandtheshellshouldbeconcentric,theerrorshallnotexceed5mm,segmentsandsegmentconnection,twoadjacentbusandenclosure,afterconnectingbusandenclosureshouldnotbesubjecttomechanicalstress.Shortcircuitbetweenphasesoftheshellplateiscorrectlypositioned,goodconnectionbetweensupportplatesshallbemountedfir
7、mly,insulationGradeinsulationshellshouldbemade.4.1.11theinstallationofexplosion-proofelectricalequipment4.1.11.1rectisolwashunitarea,tankfarmandotherexplosion-proofareas,theelectricalinstallationshallbecarriedoutasexplosion-proofrequire