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某实验小组的同学在进行“测量小灯泡的额定功率”的实验中，现有器材：电源（电压恒为6V）、开关、电压表、电流表各一个，导线若干，额定电压为3.8V的待测小灯泡（电阻约为12Ω），滑动变阻器两个（A：“...
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在测定2.5V小灯泡额定功率的实验中电源电压恒定1某同学根据图示电路进行实验实验过程中灯泡突然不亮电
2015•丽水某兴趣小组在测量额定电压为2.5伏小灯泡电功率的实验中实验电路如图甲所示.1闭合开关前
某实验小组的同学用伏安法测量小灯泡电功率待测小灯泡额定电压为3.8V小灯泡的额定功率估计在1W左右检
某同学利用如图所示的电路测量额定电压为2.5V小灯泡的额定功率下列说法正确的是
闭合开关前，滑片P.应滑到A.端
闭合开关后，小灯泡不发光，一定是小灯泡灯丝断了
当电压表示数为2.5V时，测出通过小灯泡的电流，可得出小灯泡的额定功率
实验还可得知，小灯泡的实际功率越大，小灯泡越亮“，
某实验小组的同学用伏安法测量小灯泡电功率待测小灯泡额定电压为3.8V小灯泡的额定功率估计在1W左右故
某实验小组的同学用伏安法测量小灯泡电功率待测小灯泡额定电压为3.8V小灯泡的额定功率估计在1W
某实验小组的同学用如图所示的器材测量小灯泡的电功率已知待测小灯泡额定电压为3.8V.小灯泡的额定功率
某同学用图甲唆使的电路图测量小灯泡的额定功率小灯泡标有2.5V字样1电路连接正确后闭合开关发现小灯泡
在测量小灯泡额定功率的实验中李翔实验小组的同学选用的是2.5V的小灯泡.1请用笔画线代替导线将甲图中
某同学用图甲唆使的电路图测量小灯泡的额定功率小灯泡标有2.5V字样1电路连接正确后闭合开关发现小灯泡
某同学利用如图所示电路测量额定电压为2.5V小灯泡的额定功率下列说法错误的是
当电压表示数为2.5V时，测出通过小灯泡的电流， 可算出小灯泡的额定功率了
闭合开关后，小灯泡不发光，一定是小灯泡灯丝断了
闭合开关前，滑片P.应滑到B.端
实验还可得知，小灯泡的实际功率越大，小灯泡越亮
某实验小组的同学用伏安法测量小灯泡电功率待测小灯泡额定电压为3.8V小灯泡的额定功率估计在1W左右连
某实验小组的同学用伏安法测量小灯泡电功率待测小灯泡额定电压为3.8V小灯泡的额定功率估计在1W左右实
同学用一电源不知电压两个开关一个电流表一个滑动变阻器R.20Ω2A和若干导线来测一个小灯泡的额定功率
某同学利用如图所示电路测量额定电压为2.5V.小灯泡的额定功率下列说法错误的是
闭合开关前，滑片P.应滑到
端B.闭合开关后，小灯泡不发光，一定是小灯泡灯丝断了
当电压表示数为2.5V.时，测出通过小灯泡的电流，可算出小灯泡的额定功率
实验还可得知，小灯泡的实际功率越大，小灯泡越亮
10·百色在测量小灯泡的功率的实验中小明要测量一个标有2.5V字样的小灯泡的额定功率通过实验得到这个
在电学的探究实验中1月月小组在探究电流和电压的关系时选用如图所示电路进行探究小组同学测得如下表的实验
某同学用图甲唆使的电路图测量小灯泡的额定功率小灯泡标有2.5V字样1电路连接正确后闭合开关发现小灯泡
某同学在做测定小灯泡功率的实验中所用电源的电压为6伏特小灯泡的额定电压为3.8伏特．在测定小灯泡的
在测量小灯泡额定功率的实验中李翔实验小组的同学选用的是2.5V的小灯泡.1请用笔画线代替导线将甲图中
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2008年北京奥运会的比赛门票开始接受公众预定．下表为北京奥运会官方票务网站公布的几种球类比赛的门票价格某球迷准备用12000元预定15张下表中球类比赛的门票 1若全部资金用来预定男篮门票和乒乓球门票问这个球迷可以预订男篮门票和乒乓球门票各多少张 2若在准备资金允许的范围内和总票数不变的前提下这个球迷想预定上表中三种球类门票其中足球门票与乒乓球门票数相同且足球门票的费用不超过男篮门票的费用问可以预订这三种球类门票各多少张
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InJanuary2016athree﹣episodeTVdocumentaryMastersinForbiddenCitywasbroadcastonChinaCentralTelevision.Itsoonbecamepopular﹣thefirstepisodealonehasbeenwatchednearly1milliontimessofaronthevideowebsitebilibili.com. NowthedocumentaryhasbeenmadeintoafilmandcameoutonDec162016.Itisabouthowprofessionalantiquityrestorers文物修复者intheForbiddenCityrepairancientpaintingscalligraphyclocksandbronzepieces.Itmaynotsoundexcitingbuttherestorers'patienceandtheir100percentfocusoneventhesmallestthingsisenoughtoimpresspeople. Infactmanyoftherestorersareyoungpeople.Ithasalsomadethedocumentarypopularamongtheirpeers同龄人asithasshownthempossibilityofadifferentlifestyle.AfterMastersinForbiddenCitywasbroadcastabout20000peopleappliedtoworkintheForbiddenCity.Mostofthemwerenewcollegegraduates. Thejobhasbecomepopular.Sohavetherestorers.Butwasitdifficulttobepartofadocumentary?Itwasonlysupposedtobedifficultforthedirectornotforus.Wesimplydidourjobspayingnoattentiontoanyoneelsearound.saidShiLiancangoneoftherestorerswhenaskedduringthefilm'spremiere首映inShanghai.Tomakethedocumentarytheproductionteamalsodidfiveyearsofpre﹣researchandfourmonthsofuninterrupted连续的filmingintheForbiddenCity. Indeedtheserestorerskeepthispeacefulstateofmindanddevotethemselvestodoingthesamethingtheydeeplylovedayafterday.AstheposterforthedocumentarysaysChooseacareeranddoitforalifetime. 28.WhatdoesthedocumentaryMastersinForbiddenCitymainlytalkabout? A.DetailedintroductionsofthingsintheForbiddenCity. B.HowrestorersintheForbiddenCityrepairthings. C.LifeofprofessionalantiquityrestorersintheForbiddenCity. D.DifferentkindsofworkersworkingintheForbiddenCity. 29.FromwhatShiLiancangsaidinparagraph4themostimportantqualityoftherestorersshouldbe. A.curiosity B.creativity C.imagination D.attention 30.Whatdoesthedocumentarywanttotellpeople? A.Chooseajobyouloveanddoitwell. B.Workingasanantiquityrestorerisgreat. C.Youngpeopleshouldliveadifferentlife. D.ShootingafilmintheForbiddenCityrequireshardwork.
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下列几何体中主视图和左视图都为矩形的是
ThemainreasonIwasalittlenervoustogotoInnerMongoliawasthatIdidn'treallyknowwhattoexpect.HoweverIwasinterestedinthehorseridingarcheryanddeliciousfoodthatIhadheardabout. AlsomyfriendandIwouldbetravellingthereandsleepinginatraditionalMongolianyurtwithcompletestrangers.Iwasworriedaboutthisnewanddifficultexperience. Assoonaswegottothegrasslandsafterourlongfive﹣hourjourneybycarweweregreetedwithsteamingbowlsofheartyMongoliannoodles﹣justwhatweneededtogetusinthemoodtoexplore.Wetookawalkaroundthegrasslandsandweresurprised﹣notonlybytheirbeautybutalsobythestrongwindsthatblewdirtintoourhairandnearlyknockedusoffourfeet. Beforelongitwastimetogohorseriding.IwasworriedbecauseitwasthefirsttimeIhadeverriddenahorse.Ididn'tneedtoworrythough﹣wewereallbeginnersbutthehorsesmadeitveryeasyforus.Howevertheydidhaveahabitofturningaroundandgoingtheotherwayfornoreason! Intheeveningweateanothersimpledeliciousmealofroastlamb.Afterwardswehadastrangetask﹣tocollectdung粪便tomakeafire.Intheendwehadagreattimearoundthecampfirethateveninglisteningtomusicandsharingstoriesofourdaywithstrangers.Thatwasthemostexcitingpartofourtrip. Thenwewenttosleepinouryurt.Becausewewereinthegrasslandsthetemperaturedroppedsharplyatnighttoaroundzerosowefeltcoldthroughoutthenighteventhoughsixotherpeopleweresleepingwithus. ThenextdaywewokeupstillfeelingtiredandheadedbacktoHohhotcapitalofInnerMongoliaautonomousregion.Wereallylovedthenicehotelroomwesleptinthatnightandtheshowerthatwashedthedirtoutofmyhair.Howeverwedidn'tregrethavingtheadventureintheInnerMongoliangrasslands. 36.Howdidthewriterfeelbeforethetrip? A.Hefeltnervousaboutexperiencingnewthings. B.Hehadmixedfeelingsaboutthecomingtrip. C.Hecouldn'twaittogoonanadventureintotheunknown. D.Hefeltworriedabouttravellingwithcompletestrangers. 37.ThewriterexperiencedmanythingsinInnerMongoliaEXPECT. A.sleepingintheopenair B.horseriding C.makingafire D.listeningtomusicandsharingstories 38.WhichofthefollowingstatementsisTRUEaccordingtothearticle? A.Thewriterdidnotexpectthewindtobesohard. B.Roastlambwasthewriter'sfavouriteMongolianfood. C.Thewriterthoughtthatcollectingcowdungwasveryunpleasant. D.Sleepingwithothersmadethenightfeellesscoldtothewriter. 39.Whatcanwelearnaboutthewriter'shorseridingexperience? A.Thehorseshadprobablybeentrainedwell. B.Horseridingwasthemostexcitingpartofthewriter'strip. C.Thewriterwaswellpreparedforhishorseridingexperience. D.Thewriter'shorsekeptturningaroundbecausehedidn'tknowhowtocontrolit. 40.Thewriterwrotethisarticlemainlyto. A.showthatitwasthedifficultpartsthatmadehistripgreat B.describewhatInnerMongoliaisreallyliketoreaders C.tellreaderstobebraveandexploretheunknown D.shareaninterestingtravelexperience
一个袋子中装有3个红球和2个黄球这些球的形状大小质地完全相同在看不到球的条件下随机从袋子里同时摸出2个球则这2个球的颜色相同的概率是．
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小明在测小灯泡电功率实验中电路图如图甲所示电源电压为8V小灯泡L的额定电压为2.5V正常发光时的电阻约为10Ω可供选用的滑动变阻器R1R2和R3的最大阻值分别为5Ω20Ω50Ω．1为了保证元件安全应该选用的滑动变阻器是选填R1R2或R3．2图乙是根据实验数据绘制的U—I关系图象．由此可知小灯泡的额定功率是W．当滑动变阻器的滑片向左移动时灯丝的电阻将3小明继续向左移动滑片小灯泡发出刺眼的光然后突然熄灭电流表示数变为零那么产生此故障的原因是
下列运算中正确的是
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