- 问题详情:一交流电压为u=100sin100πtV,由此表达式可知A.该交流电压的周期为0.02sB.用交流电压表测该电压,其示数为100VC.将该电压加在100Ω的电阻两端,电阻消耗的电功率为200WD.t=时,该交流电压的瞬时值为100V【回答】AD知识点:(补充)表征交变电流的物理量题型:选择题...
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- 问题详情:—Doesyourfatherplaysports?—No,heonlywatchesTV. in on on in【回答】B知识点:相似相近词比较题型:选择题...
- 9016
- 问题详情: Hewatchesfootball TV Sundaymorning.A.at;on B.on;on C.in;in【回答】B知识点:介词和介词短语题型:选择题...
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- 问题详情:TV PROGRAMESChannel1 Channel218:00AroundChina 21:00Englishfortoday18:30Children'sprogram ...
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- 问题详情:单项选择IliketowatchbasketballgamesTV. 【回答】A知识点:介词和介词短语题型:选择题...
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- 问题详情:如图所示,理想变压器原线圈a、b两端接正弦交变电压u,u=220sin100πt(V),电压表V接在副线圈c、d两端(不计导线电阻).则当滑动变阻器滑片向右滑动时A.电压表示数不变B.电流表A2的示数始终为0C.若滑动变阻器滑片不动,仅改变u,使u=220sin200πt(V)则电流表A1的示数增大D.若滑动变阻...
- 19106
- 问题详情:一台旋转电枢式交流发电机,在正常工作时的电动势e=220√2sin100πt(V),由于超负荷使得电枢转速降低了1/10,这时的电动势是( )A.e=220√2sin100πt(V) B.e=220√2sin90πt(V)C.e=198√2sin100πt(V) D.e=198√2sin90πt...
- 18605
- 问题详情:一矩形线圈在匀强磁场中绕中心轴转动,产生的交流电动势e=10sin4πt(V),以下说法正确的( )A.交流电的频率是4πHzB.当t=O时,线圈平面跟中*面垂直C.当t=1/2s时,e有最大值D.交流电的周期是0.5s【回答】D知识点:交变电流题型:选择题...
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- 问题详情:如图所示,一理想变压器原副线圈匝数之比为5∶1,原线圈端输入交流电压u=311sin100πtV,电阻R=44Ω,电流表和电压表对电路的影响忽略不计.下列说法中正确的是A.电压表V1的示数约为311VB.电流表A1的示数约为0.20AC.电压表V2的示数约为44VD.电流表A2的示数约为1.4A【回答】BC知...
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- 问题详情:有一种家用电器,图*是其电路工作原理图,当电阻丝接在u=311sin100πt(V)的交流电源上后,电阻丝开始加热,当其温度达到某一数值时,自动控温装置P启动,使电阻丝所接电压变为图乙所示波形(部分仍为正弦波),从而进入保温状态。不计电阻丝阻值的变化,则下列说法正确的是()A.P启动...
- 32309
- 问题详情:Wearebusywiththemid-termexam,sowehavenotime TV theeveningofNov.16. A.towatch;on B.towatch;in C.watching;on D.watching;in【回答】A知识点:相似相近词比较题型:选择题...
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- IncaseofsatelliteTVbroadcasting,asatelliteTVbroadcastingsystemcoveringthewholeworldandasatelliteTVeducationsystemcoveringthewholecountryhavebeenestablished.Chinahasabout189,000satelliteTVbroadcastingreceivingstations....
- 9554
- 1、Wecanassembletheprovidedpartsandcomponentsintocolortvset.2、ThenexttimeIbuyatvset,Iamgotobuyaportablemodel3、apolecarryinganoverheadmicrophoneprojectedoverafilmortvset.4、Wepayforthetvsetininstallmentof100dollaramonthforfivemonth5、DoubleBedSuitee...
- 26807
- 问题详情: Hisaunt TV. A.likewatch B.likeswatching C.likeswatch 【回答】B 知识点:动词和动词短语题型:选择题...
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- 问题详情:如图所示,理想变压器原线圈a、b两端接正弦交变电压u,u=220sin100πt(V),原、副线圈的匝数比n1∶n2=10∶1,电压表接在副线圈c、d两端,输电线的等效电阻为R,原来开关S是断开的。则当S闭合一段时间后()A.电压表示数不变,示数为22VB.电压表示数不变,示数为220VC.灯泡L两端的电...
- 19488
- aTVprogrammefortinytotsThe(audience)ratingofaTVprogrammeItwantsideasforanewTVprogramme.NotsolongagofindingaTVprogrammewaseasy.IwaswatchingtheTVprogrammewhenthetelephonerang.ThatismuchbetterthanwatchingabadTVprogramme!两个人吵架,最后终究有一个人先认输...
- 19267
- 问题详情:某交流电源电压的瞬时值表达式为u=6 sinl00πt(V),则下列说法中正确的是( )A.用交流电压表测该电源电压时,示数是6VB.用交流电压表测该电源电压时,示数是6 VC.用此电源给电磁打点计时器供电时,打点的时间间隔为0.01sD.把标有“6V3W”的小灯泡接在该电源上时,小...
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- 问题详情: When I was young, I watch TV whenever I wanted to. A. should B. could C. must D. need【回答】B知识点:虚拟语气与情态动词题型:选择题...
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- 问题详情:a为某型号电热毯的电路图,将电热丝接在u=156sin120πtV的电源上,电热毯被加热到一定温度后,由于P的作用使输入的正弦交流电仅有半个周期能够通过,即电压变为图b所示波形,从而进入保温状态.则此时交流电压表( )A.测量的是电压的最大值,读数是156V B.测量的...
- 31771
- TheFormofProductPlacementsinRealityTVShow;TheBigBangTheoryreceivedtophonorsfor"FavoriteTVShow."TheTVmakersshouldcarryoutlearning"thesocialistoutlookonhonorandshame"deeply,buildsocialistHarmonioussocietywithexcellenthealthyEntertainmentTVShow.Unem...
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- ApplicationofnonlineareditingsystemtocollegeeducationalTVstation;DesignandrealizationofeducationalTVstationsystemofcampusnetworkThedevelopmentofeducationalTVisonlypossibleunderpositivepolicycontext:integrallegislativesystem,reasonablepoliciesandsound...
- 15474
- 问题详情:如图所示,理想变压器的原副线圈的匝数比为4:1,原线圈接有u=311sin100πtV的交变电压,副线圈上接有定值电阻R、线圈L、灯泡L1及理想电压表V,以下说法正确的是A.副线圈中电流的变化频率为50HZB.灯泡L1两端电压为55VC.若交变电压u的有效值不变,频率增大,则灯泡L1的亮度将变暗...
- 19597
- towedunderwaterTV-camerasystemTheapplicationforthisimageSensoriswide.anditscharacteristicsparameters.forexample.resolutionfactorandlookangle.arebetterthanFUT-7modelunderwaterTVmadeinJapan....
- 26958
- satelliteTVgroundreceivingstationButcableandsatelliteTVbreezedthrough.IncaseofsatelliteTVbroadcasting,asatelliteTVbroadcastingsystemcoveringthewholeworldandasatelliteTVeducationsystemcoveringthewholecountryhavebeenestablished.Chinahasabout189,000sate...
- 29478
- 问题详情:I can only watch TV forhalf _____ hour every evening. A.a B. an C. the D. / 【回答】B知识点:冠词题型:选择题...
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