2021年初中电学测试题 5页

Pushingahead,East,North,Westdevelopment,facilitatingshanty,completexinchengWestRoad,stabilityandreconstructionofthestreet,StarDinggardenbuiltcenturyGardenDistrict,subjectpublichousingconstruction,heatingthegasexpansionacceleratedimplementation,JingRuiRiverandbridgestylelinesolidshaft,furtherexpandedthetowndevelopment.Beautifulcountryadheretotheadvanceandtypicalforagrouptolead.Accordingto"ecologicallaybased,andindustryincreasedincome,andliveupgradecivilization,andculturerichconnotation"ofthought,caughtbuiltbeautifulvillage,andwholevillageadvance,andeasilyrelocation,and"fivemodifiedthreebuilt",projectnear30a;depthintoecological,andindustry,andculture,andtourism,elements,highstandardscaughtpartyoriginalcityLiu,andjadeareXiaAO,modelvillage,inprovinceCitysethasbenchmark.Fourisequalbenefitstopromotesharing,coordinateddevelopmentofvarioussocialundertakings.Inthecaseofrigidspendingslowingrevenuegrowth,increase,financial75%tothepeople'slivelihood,themasseshavemoreaccessinthesharing.Cuobansomethinggoodandbenefit.Adheretotheaffordable,best,carefullycuobanvillageoil,waterandheat,cultural,cityandCountycolumnspractical,developmentsbenefitfamilies,bringmorewelfaretothemasses.Developmentofsocialconvenience.Acceptanceofbalanceddevelopmentofcompulsoryeducationthroughthenationalassessment,theCountyvocationaleducationcenterwasnamed"topSchoolofvocationaleducationinChina",thethirdbatchofnationalreformanddevelopmentmodelthroughprovincial...Fiveistodeepenreformandinnovationtobreakbottlenecksandendogenousdevelopmentofeffectivefire.Asanengineofdynamism,addingreformkeytoadoptingreformmeasuresstressenergyandbreakbottlenecksandpromotingdevelopment.Paycloseattentiontothekeyareasofreform.Conscientiouslyimplementtheprovincialdeploymentandcancel,adjustment,toundertaketheadministrativeapprovalitemsaccordingtoRegulation347tofurtherimproveadministrativeefficiencycontinuingdeepeningreformforpovertyalleviation,speedinguprurallandrightregistrationcertificationpilotproject,encouragingtheorderlytransferoflandmanagement,utilizethelandresources,inordertopromotescalemanagementlaidtheFoundation.Activelycultivatethemarket.Firmlyestablishamarket-oriented,nurturingfamilyfarms,industrialusers,professionalcooperationorganizationnewmarketmanagementmainbody456,effectivelyimprovetheindustry,intensiveandmarketizationofencouragingsupportsocialcapitalintothesmallmicro-credit,urbandevelopment,cultureandtourism,publicservicesandotherareas,easingdevelopmentshortfall.Topromotemassinnovation.osupporttheruralsectortousenewthinkingandnewideas,creativeworkincentivessuchasactivelypromotingfinancialintermediation,bringadded159innonpublicenterprises,individually-1540,createda物理试题2013.9一选择题（2╳22=44`）VL21.如右图当开关Ｓ闭合时，灯泡两端的电压L1和L2都发光，此时电压表测量的是：()Ａ、L1两端的电压B、L2两端的电压SL1C、L1和L2两端的总电压D、电源的电压2.如右图，当滑片P向A端移动时，下列判断正确的是：()A、通过电阻器的电流变小B、通过灯泡的电流不变C、电流表的示数变小D、变阻器接入电路中的电阻变小A3.下图所示滑动变阻器四种不同接法中，当闭合开关，使滑片PLAPB向左滑动，滑动变阻器接入电路中的电阻变大的是：()CCCCDDDDPPPPAAAABBBBABCD4.如右图所示的电路中，电源电压为6V，甲乙两灯规格相同，当闭合开关S后两灯都不亮，现用电压表进行检测，AB两点间的电压为···ABC零，BC两点间的电压为6V，造成故障的原因可能是：()乙甲A、电源接触不良B、甲灯接触不良或灯丝断C、开关接触不良D、乙灯接触不良或灯丝断开S5.如右图所示，已知两只灯泡L1和L2是并联,a、b表示电压表和电流表，下列说法正确的是：()A、a是电流表，b是电压表C、a、b都是电流表aL1B、a是电压表，b是电流表D、a、b都是电压表6.对欧姆定律公式I＝U/R的理解，下面哪一句话错误？()·L2·A．对某一段导体来说，导体中的电流跟它两端的电压成正比。bB．在相同电压的条件下，不同导体中的电流跟电阻成反比。C．导体中的电流既与导体两端的电压有关，也与导体的电阻有关。D．因为电阻是导体本身的一种性质，所以导体中的电流只与导体两端的电压有关，与导体的电阻无关。7.如图所示，电源总电压为6V保持不变，R1=5Ω，R2=10Ω，当开关S由闭合到断开时，电压表V的示数将()A．由2V变为6VB．由4V变为6VC．由4V变为2VD．6V保持不变8.如图2所示，AB和BC是由同种材料制成的长度相同、横截面积不同的两段导体，将它们串联后连入电路中．比较这两段导体两端的电压及通过它们的电流的大小，有()A．UAB>UBC，IABUBC，IAB＝IBCD．UAB＝UBC，IAB