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1、电工学1.3.1求图示电路中开关S闭合和断开两种情况下a、b、c三点的电位。RS3V6Vabc[解]S闭合时，S断开时1.3.2求图示电路中开关S闭合和断开两种情况下a、b、c三点的电位。S2kWabc＋12V4kW－6V4kW2kW解：S闭合时1.5.1试根据理想电压源和理想电流源的特点分析图示的两电路：当R变化时，对其余电路（虚线方框内的电路）的电压和电流有无影响？R变化时所造成的影响是什么？standardsandaccompaniedbythemanufacturer'squalitycertificate.Eachbatchofmaterialstoragetestshould
2、berequiredbeforeacceptance,wewilltestresultssubmittedtothesupervisorinatimelymanner.11.2.2cement(1)shallbeunderthesupervisionofconstructiondrawingsorinstructions,usegroutofcement.UsedforbackfillgroutingandtheGroutingcementstrengthshouldnotbelowerthanPO42.5.(2)Groutingcementmustmeettherequiredqual
3、itystandards,lumpedthecementshallbeused.Cementshouldnotbestoredfortoolong,thefactoryofcementshouldnotbeusedformorethanthreemonths.11.2.3waterfillingwithwater,thewaterusedinmixingconcreterequirements,mixingwatertemperaturemustnotexceed40.C。11.2.4additivesapprovedbythesupervisor,canbemixedwithsandi
4、ncementslurry,flyashandwaterglass.QualityofvariousadmixturesshallconformtoDL/T5148-20015th.section1.6,theincorporationshouldbedeterminedthroughexperiments,testresultsshouldbesubmittedtothesupervisor.11.2.5additivesapprovedbythesupervisor,canbemixedwithquick-settingCementGroutagents,reducingagents
5、,stabilizersandthesupervisorinstructionsor...Thenthenextcycle[解]对电路（b），因为凡与理想电流源串联的元件其电流均等于理想电流源的电流，故改变R不会影响虚线部分电路的电流，而虚线部分电路结构一定，故亦不会影响其电压。R的变化仅影响其本身的电压及理想电流源的电压。ISR任
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路ISR任
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路standardsandaccompaniedbythemanufacturer'squalitycertificate.Eachbatchofmaterialstoragetestshouldbe
6、requiredbeforeacceptance,wewilltestresultssubmittedtothesupervisorinatimelymanner.11.2.2cement(1)shallbeunderthesupervisionofconstructiondrawingsorinstructions,usegroutofcement.UsedforbackfillgroutingandtheGroutingcementstrengthshouldnotbelowerthanPO42.5.(2)Groutingcementmustmeettherequiredqualit
7、ystandards,lumpedthecementshallbeused.Cementshouldnotbestoredfortoolong,thefactoryofcementshouldnotbeusedformorethanthreemonths.11.2.3waterfillingwithwater,thewaterusedinmixingconcreterequirements,mixingwatertemperatur
