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如图甲是灯泡L和电阻R的I﹣U关系图象,灯丝电阻受温度的影响,温度越高其电阻越大.将L和R以两种不同的方式接在同一电源上,如图乙和两.若乙图中U1:U2=m,丙图中I1:I2=n,则下列关系式中正确...
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如图甲所示的电路小灯泡L.标有6V3.6WR.为滑动变阻器电源电压保持不变闭合开关S.后滑片P.从b
如图甲是灯泡L和电阻R的I﹣U关系图象灯丝电阻受温度的影响温度越高其电阻越大.将L和R以两种不同的
m=n
mn<1
mn=1
mn>1
在图甲所示的电路中已知电源为电压可调的直流电源R0是滑动变阻器R.是定值电阻图丙是灯泡L.的U.﹣I
某小组用如图所示的电路实物装置测绘额定电压为4.0V的小灯泡的伏安特性曲线其中小灯泡的电阻约为几欧电
如图甲是灯泡L.和电阻R.的I.-U.关系图像灯丝电阻受温度的影响温度越高电阻越大.将L.和R.以两
m=n
m=
m<
m>
如图甲是灯泡L.和电阻R.的I.-U.关系图像灯丝电阻受温度的影响温度越高电阻越大.将L.和R.以两
m=n
m=
m<
m>
2015•岳阳如图甲是电阻R.和灯泡L.的U-I图像由图可知电阻R.的阻值是Ω若将电阻R.和灯泡串联
小宇用如图甲所示电路对一只标有0.8A字样的小灯泡L.进行了测试电源电压恒为9V电阻箱R.0的阻值可
如图甲是灯泡L.和电阻R.的I.-U.关系图像灯丝电阻受温度的影响温度越高电阻越大.将L.和R.以两
m=n
m=
m<
m>
图甲是利用伏安法测小灯泡电阻的实验电路图图乙是根据实验数据画出的通过小灯泡的电流I.与它两端电压U.
如图甲是灯泡L.和电阻R.的I.-U.关系图像灯丝电阻受温度的影响温度越高电阻越大.将L.和R.以两
m=n
m=
m<
m>
2015·岳阳如图甲所示是电阻R.和灯泡L.的U.-I.图像由图可知电阻R.的阻值是________
如图甲所示是电阻R.和小灯泡L.的U.﹣I.图象由图可知电阻R.的阻值是__________Ω若将电
如图甲所示为分别测量小灯泡L.和定值电阻R.后得到的I.﹣U.关系图象.把灯泡L.和电阻R.接在电源
小明要分别测量如图甲所示的三个定值电阻和规格为3.8V小灯泡的阻值电源电压均为4.5N.1请参照测定
某同学用图甲所示的电路测绘额定电压为3.0V的小灯泡伏安特性曲线并研究小灯泡实际功率及灯丝温度等问题
小宇用如图甲所示电路对一只标有0.8A字样的小灯泡L.进行了测试电源电压恒为9V电阻箱R.0的阻值可
2.00分如图甲是灯泡L和电阻R的I﹣U关系图象灯丝电阻受温度的影响温度越高其电阻越大.将L和R以
m=n
mn<1
mn=1
mn>1
如图7所示是分别测量定值电阻R.和小灯泡L.两端电压和通过的电流后得到的U.-I.关系图象由图可知定
如图所示甲为定值电阻R的U﹣I图象乙为小灯泡的电阻RL的U﹣I图象将定值电阻R和小灯泡RL串联在电
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Peoplewithanimpulsivepersonalityrefertothosewhotendtodothingswithoutconsideringthepossibledangersorproblemsfirst.AccordingtoanewstudybyresearchersattheUniversityofGeorgiasuchpeoplemaybemorelikelytohavefoodaddiction.Thestudyfoundthatpeopleexhibitingimpulsivebehaviorweren'tnecessarilyoverweightbutimpulsivenesswasrelatedtoadirectrelationshipwithfoodandthereforelesshealthyweight.Foodaddictionhasbeencomparedtoaddictivedruguse.Studieshavelinkedthedopamine多巴胺releasethatoccursaftertastingdeliciousfoodtothedopaminereleasethathappenswhenpeopleconsumeotheraddictivesubstances.Impulsivebehaviorinvolvesseveralpersonalitytraits特点.TwoofthesetraitsknownasnegativeurgencyandlackofperseverancewereparticularlyassociatedwithfoodaddictionandhighBMI身体质量指数duringthestudy.Negativeurgencyischaracterizedbythetendencytobehaveimpulsivelywhenexperiencingnegativeemotions.Somepeoplemightdrinkalcoholortakedrugs.Forothersitcouldmeaneatingtofeelbetter.Lackofperseveranceiswhenapersonhasahardtimefinishinghardorboringtasks.Peoplewithalackofperseverancemighthavedifficultyattemptingtochangeaddictiveeatingbehaviorwhichcouldalsocauseobesity.'Impulsivenessmightbeonereasonwhysomepeopleeatinanaddictivewaydespitemotivationtoloseweight'saidDr.AshleyGearhardtaclinicalpsychologist.HewasinvolvedindevelopingtheYaleFoodAddictionScaleinaidofthosepeople.'WearetheorizingthatiffoodaddictionisreallyathingthenourmeasuretheYaleFoodAddictionScaleshouldberelatedtohelpingcontrolimpulsiveaction'saidGearhardt.ClinicalpsychologistDr.JamesMacKillopwhoselabwasconductingthestudybelievesthattherapiesusedtotreataddictivedrugbehaviorcouldhelppeoplewhosufferfromaddictiveeatinghabits.'Mostoftheprogramsforweightlossatthispointfocusonthemostobviousthingswhichareclearlydietandexercise'MacKillopsaid.'Itseemsthatmanagingstrongdesirestoeatwouldnaturallyfitinwiththeskillsapersonwouldneedtoeathealthily.'1AccordingtoParagraph1theresultoffoodaddictionis.A.lesshealthyweightB.motivationtoloseweightC.negativeemotionsD.takingalcoholordrugs2HowdoestheauthorintroducethetwopersonalitytraitsinParagraph4?A.Bymakingcomparisonsandconclusions.B.Byexplainingcausesandeffects.C.Bypresentingquestionsandanswers.D.Bygivingdefinitionsandexamples.3WhatcanbeinferredabouttheYaleFoodAddictionScalefromthetext?A.Ithasbeensuccessfullycarriedoutamongoverweightpeople.B.Itmighthelpsomeimpulsivepeoplewithfoodaddictiontoloseweight.C.Itwillprovewhetherfoodaddictionisaproblemtoimpulsivepeople.D.Itistheoreticallyapropertreatmentforaddictivefoodanddrugbehavior.4Whichofthefollowingcanbethebesttitleforthetext?A.DopaminereleasecausedbyfoodaddictionB.FoodaddictioncomparedtodruguseC.ImpulsivepersonalitylinkedtofoodadditionD.Foodaddictioncontributingtoobesity
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.错误仅涉及一个单词的增加删除或修改.增加:在缺词处加一个漏字符号∧并在其下面写出该加的词.删除:把多余的词用\划掉.修改:在错的词下画一横线并在该词下面写出修改后的词.注意:1.每处错误及其修改均仅限一词;2.只允许修改10处多者从第11处起不计分.Ialwayshaveadreamtobeafluencyspeaker.ThereforeIamtooshytosayawordinpublic.Whatisjustbeyondmywildestimaginationisfortuneshouldblessmewithachancetorealizemydream.OnedaymyEnglishteacheraskedmetogotoherofficeandtoldusthatIwasgivenanopportunitytoparticipateinanEnglishspeakingcompetition.HearthisIcouldhardlyhidemyexcitement.WhenmakingpreparationforthecompetitionIwritemyspeechheartandsoul.AfterIfinishedthecompositionIdiscusseditwithmyteacherandgotmanyadviceonhowtoimproveit.UnderthehelpofmyEnglishteacherImadeagreatprogress.
在数轴上表示下列各数所代表的点并将其按从小到大的顺序重新排成一列2-0-1.6
已知实数在数轴上的对应点如图所示化简
将下列各数开平方.0.81
如图所示是伽利略的斜面实验下表为某次实验的一组数据.据此他发现=常数.有同学想验证伽利略的这个结论作出如下四幅图象不合理的是
将下列各数开平方 1
判断无理数是无限不循环小数.判断题
判断无理数包括正无理数零负无理数.判断题
求下列各式的值.
ImadeanameformyselfwhenIwasabout26.Itnevermeansanything1tomebutofcourseIcan'tsayIamfreefromvanity虚荣.Whenasigningeventwasorganizedformybookatits2saleorwhenIwasinvitedtodeliveraspeechatameetingIwouldbe3andcheerfulespeciallyiftherewerelotsofparticipants.4Ihaveneverbeencontrolledbysuch5forIhavemyownideaofit.Tomean6remainspopularonlyforthreeseconds.Thismorningsomebody7meonthewayandsaid'Ahthat'sZhuDeyong!'Iwasgladtobe8byastrangerandenjoyedmyself'9Iamfamous!'Butsuchenjoyments10onlythreeseconds.Hepassedbyandturnedtothepersonwalkingwithhim'Whatshallwehaveforlunch?'No11ofmeanylonger.ShallI12mylifecherishingthosethreeseconds?Isitnecessarytomakeeffortsto13suchthree﹣secondenjoyments?NoIdon'twantto.Aslifeis14andonlycomesaroundonceitisofgreatvaluetothepersonhimselfbutofnovaluetoothers.Formostpeopleone'snameremains15onlyforthreegenerations:one's16generationthesecondyoursonmaysay'Ahit'smydad.'andthethirdyourgrandsonmaystill17'Ahit'smygrandpa.'Ifamemberofthefourthgenerationisaskedaboutyouhemightbe18'Whoisit?'Ifheisshownapictureofyouhemightgiveitaglanceputitasideand19forgetit.Itamountstonothingmorethana20withanunknownname.1A.impressive B.reasonable C.appropriate D.important2A.unique B.first C.best D.final3A.happy B.upset C.hesitant D.nervous4A.Likewise B.Therefore C.However D.Meanwhile5A.discouragements B.embarrassments C.excitements D.disappointments6A.speech B.name C.book D.event7A.saw B.hit C.patted D.introduced8A.spotted B.recognized C.noticed D.liked9A.Totally B.Aboveall C.Finally D.Afterall10A.maintained B.stayed C.lasted D.remained11A.mind B.idea C.thought D.memory12A.waste B.spare C.devote D.afford13A.reach B.acquire C.offer D.honor14A.easy B.ordinary C.tough D.short15A.welcome B.personal C.respectable D.known16A.past B.own C.future D.new17A.remember B.memorize C.remind D.believe18A.annoyed B.interested C.puzzled D.frightened19A.quickly B.seldom C.deliberately D.otherwise20A.friend B.writer C.grandpa D.stranger
关于速度与加速度的关系下列说法中正确的是
质量m=20kg的物体静止在水平面上物体与水平面间的滑动摩擦力为40N.现对物体施加一水平推力使物体做匀加速运动测出物体在运动后10s末的速度为8m/s求水平推力的大小.
“叠罗汉”是一种高难度的杂技.由六人叠成的三层静态造型如图所示假设每个人的重力都为G且两脚承受压力相等下面五人弯腰后背部呈水平状态则最底层正中间的人的一只脚对水平地面的压力为
求下列各式的值=
填空.π--2π+12-正整数集{}分数集{}有理数集{}无理数集{}负实数集{}实数集{}
求下列各式字母的取值范围.
爱因斯坦说“伽利略理想斜面实验指出了真正建立动力学基础的线索.”伽利略根据理想斜面实验
求下列各数的立方根.
质量M=2kg的长木板放在水平光滑的平面上右端放一个质量为m=6kg的物块在水平拉力F的作用下由静止开始向右运动如图所示已知物块与木板间摩擦因数μ=0.2最大静摩擦力等于滑动摩擦力g=10m/s2求 1要保持物块相对木板静止拉力F允许的最大值是多少 2当拉力F=16N时物块受到的摩擦力多大
求下列各数的立方根.-5
比较大小--
OnMay28th1998Iwasdrivingmy13﹣year﹣olddaughterand14﹣year﹣oldsontoschool.Unfortunatelymycarcrashedwithatruck.Allthreeofuswerecriticallyinjured.Stacey'sbraininjurywasthemostsevere.Despiteallattemptstosavehershediedtwodayslater.WhenIbecameconsciousIheardmyhusbandtalkingtotheorgandonorcoordinator器官捐助协调员.WeknewthatStaceywouldwantthatbecausethat'sthekindofpersonshewas.Shealwayswantedtoassistpeople.Shewasalwayssmilingandbroughtsomuchjoytoothers.Shewasfriendlyandenjoyedwritingstoriesandpoetry.IthasbeenacomforttoknowthatStaceylivesoninthelivesofothers.IhaveevenmetthefamilyofoneofStacey'skidneyrecipients接受人.Thislittlegirlwas6yearsoldatthetimeofthetransplant.ShewassufferingfromNephroticSyndrome.IsawpicturesshowingtheeffectsoftheNephroticSyndromeandthepicturesofherafterthetransplant.Theyalreadyshowedanamazingdifference.Wecorrespondeveryyearthroughletterscardsandpictures.Thegirlisdoingreallywellatschoolandwillbegraduatingfromhighschoolnextyear.Iamsogratefulthatwehavethisrelationship.Ialsofeelrelievedthatmydaughterhasmadesogreatadifferencetoaperson'slife.OvertheyearsIhavehadsomekindofcontactwithalloftherecipientsexcepttheheartrecipient.I'mverysorryforthat.Iwouldlovetohearsomethingfromtheheartrecipient'sfamily.TherearesomanythingsthatIwonderabouther.IwonderifsheisanythinglikeStacey.Doesshesmileallthetime?Doessheenjoywritingstoriesandpoetry?Idohopethattheycancontactus!IfeelguiltybecauseIwastheonedrivingintheaccidentwhichcausedStacey'sdeath.Ialsofeelproudthatmydaughterhashelpedsomanypeople.1WhendidStaceydiefromthetrafficaccident?A.OnMay28th1998B.OnMay29th1998C.OnMay31st1998D.OnMay30th19982Whatdoestheunderlinedword'They'refersto?A.Thepicturestakenafterthetransplant.B.ThepeoplewhoreceivedtheorgansofStacey.C.Thepeoplewhocaredforthegirlinthehospital.D.ThepicturesshowingtheeffectsoftheNephroticSyndrome.3Whatisthewriter'sattitudetowardsherdaughter'sorgandonation?A.GratefulB.DissatisfiedC.ProudD.Guilty4Whathasthewriterbeenlookingforwardtodoing?A.Contactingthekidneyrecipient'sfamily.B.Visitingkidneyrecipient'sfamily.C.Gettingpaidfromtheheartfamily.D.Seeingtheheartrecipient.
摄氏温度是把的温度规定为100℃把的温度规定为零摄氏度如图所示是体温计和寒暑表的一部分其中图是寒暑表甲乙两表分度值较小精确度较高的是.甲乙两温度计的示数分别为℃和℃.
关于速度和加速度的关系下列说法中正确的是
在做“探究匀变速直线运动”实验时 1要用到打点计时器关于打点计时器及其操作下列说法正确的是不定项 A.打点计时器是一种计时仪器使用电源的频率为50Hz每隔0.02秒打一次点 B.电磁打点计时器的工作电压是4﹣6V的交流或直流电而电火花打点计时器的工作电压是220V交流电 C.实验操作时是先接通打点计时器然后让物体带动纸带运动 D.实验操作时是让物体带动纸带运动的同时接通打点计时器 2某同学打出的纸带如下图图中上面的数字为相邻两点间的距离纸带上两相邻计数点的时间间隔为T=0.10s试求计算结果数值保留到小数点后面第二位 ①打第5个计数点时纸带的速度v5=m/s. ②0﹣6点间的加速度为a=m/s2.
求下列各式的值.-=
下列说法正确的是
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