首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
一个圆锥和一个圆柱等底等高，圆锥的体积是76cm³，圆柱的体积是 cm³．
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
一个圆柱与一个圆锥在等底等高的情况下圆柱的体积是圆锥的倍圆锥的体积是圆柱的削去部分的体积是圆柱的圆锥
一个圆柱和一个圆锥等底等高圆柱的体积是圆锥体积的倍圆锥体积是圆柱体积的比圆柱体积小．
一个圆柱和一个圆锥等底等高圆锥的体积是76平方厘米圆柱的体积是立方厘米．
一个圆柱和一个圆锥等底等高圆柱的体积比圆锥的体积多7.8立方米圆柱的体积是圆锥的体积是．
一个圆锥和一个圆柱等底等高圆锥的体积是76cm3圆柱的体积是cm3．
一个圆锥与一个圆柱等底等高圆锥的体积是圆柱的圆柱的体积是圆锥的．
一个圆柱和一个圆锥等底等高圆锥的体积比圆柱少．
一个圆锥和一个圆柱等底等高圆锥的体积是76立方厘米圆柱的体积是立方厘米．
一个圆锥和一个圆柱的底面积和体积都相等圆锥的高是24分米圆柱的高是分米一个圆锥与一个圆柱等底等高它们
一个圆锥和一个圆柱等底等高已知圆锥的体积比圆柱少12立方分米圆锥的体积是立方分米．
一个圆柱和一个圆锥等底等高它们的体积一共是100立方厘米圆柱和圆锥的体积各是多少
一个圆锥和一个圆柱等底等高如果圆锥的体积比圆柱小2.4立方分米那么圆柱的体积是立方分米．
一个圆锥和一个圆柱等底等高圆锥体积比圆柱小18立方分米圆锥的体积是立方分米．
一个圆柱与一个圆锥等底等高圆柱的体积是2立方分米．圆锥的体积是多少
一个圆柱和一个圆锥等底等高体积相差6.28立方分米．圆柱和圆锥的体积各是多少
一个圆锥和一个圆柱等底等高圆锥的体积相当于圆柱的体积圆柱和圆锥体积的比是．
把一个圆柱削成一个和它等底等高的圆锥圆锥的体积是圆柱体积的削去的体积占圆柱的．
一个圆锥和一个圆柱等底等高圆锥的体积是76cm3圆柱的体积是cm3．
关于圆柱和圆锥的关系下面说法正确的是
圆柱的体积是圆锥体积的3倍
圆锥的体积小于与它等底等高的圆柱的体积
如果一个圆柱与一个圆锥的体积相等，那么圆锥的高一定是圆柱高的
一个圆柱和一个圆锥等底等高．已知圆锥的体积比圆柱少10立方厘米则圆柱的体积是立方厘米．
热门试题
更多
﹣﹣﹣Whatdidtheteachersaytoyou? ﹣﹣﹣Heaskedme. A.whyIlookunhappythen B.whendidIgohomelastnight C.howcouldIsolvetheproblem D.ifIhadgoteverythingready
某同学用如图甲所示电路图测定电源电动势和内阻定值电阻R0＝2Ω． 1根据图甲所示电路将图乙所小的实物图连接补充完整 2某同学实验过程中测出当电压表V1的读数U1＝1.80V时电压表V2的读数U2＝0.60V．改变滑动变阻器滑片的位置电压表V1的读数U1′＝2.40V时电压表V2的读数为U2′＝2.00V则电源电动势E＝V內阻r＝Ω．结果均保留三位有效数字 3本实验电路设计有在系统误差．为了减小系统误差下列说法止确的是填正确答案标号． A．对于电压表V1应选用内阻更小的B．对于电压表Ⅴ1应选用內阻更大的 C．对于电压表V2应选用内阻更小的D．对于电压表V2应选用内阻更大的
TheNationalFootballLeagueNFLisaprofessionalAmericanfootballleaguewith32teamsin.Howdoesonechoosewhichteamtosupport?Somepeoplechoosetheteamoftheirhometownorwheretheynowliveortheteamthattheirparentsortheirparentsortheirfriendsfollow. AboystudentfromOklahomawrotealettertoeachoftheownersorpresidentsofthe32NFLteams.Hewouldseewhatanswershegotandthenchoosehisteam. Billwashomefromschoolsick.ItwastheweekbeforeChristmas.Hewaskindofboredandneededsomethingtodo.Soheaskedhisparentsifhecouldwritetoeveryprofessionalfootballteam.Billwrotethe32lettersbyhand. Weweren'tquitesurewhatwecouldgetback.Hedidn'treallyhaveoneteamthathewantedtohearfromhismothersaidHejustwantedtoseewhatkindofreplyhe'dget. AlettertotheCarolinaPanthers'ownerJerryRichardsonwasoneofthoseposted.BillwroteinhisletterMyfamilyandIlovefootball.Theyarefansofdifferentteams.ButIdon'thaveateamtocheerforyet.IamreadytopickanNFLteamtocheeronforlifetime! AfewweekslaterBill'smotherwaspullingintoherdrivewaywhenadeliverymanarrivedwithaboxfromthePanthers.WhenBillcamehomeheexcitedlyopenedthebox.InsidehefoundasignedCarolinaPanthershelmet头盔aswellasahandwrittennotefromJerry. TheteamownerhadwrittentoBillWeshouldbehonored光荣的ifourCarolinaPanthersbecameyourteam.Wewouldmakeyouproudofyourjoiningus. Billwasoverjoyedwithwhathegot.HedecidedthatfromthenonhewouldsupportthePanthers.HekeepstheletterfromJerryinhisbedroom.HismothersaysIt'snotthehelmettheysentus.It'swhattheytoldus.ThatiswhatmatteredtoBillandwhyhechosetobecomeaPanthers'fan. 1Welearnfromthepassage. A.friendsalwayschoosedifferentteamstosupport. B.only32citiesinAmericahavetheirownfootballteams C.somepeoplechooseateamtosupportastheirparentsdo D.footballteamsarejustpopularwiththepeopleoftheirhometowns 2Billwantedtochooseafootballteamtosupportbecause. A.NFLwasveryprofessional B.hehimselfwaswillingtodoit C.hisparentsexpectedhimtodoit D.hewasillandfeltboredatschool 3TheresultofBill'slettertothePantherswasthat. A.hismotherkeptthereplyfromhim B.hegotmanyhelmetsfrom32teams C.eachteamwantedhimtobeitsplayer D.hebecameafanoftheCarolinaPanthers 4It'sclearthat. A.itispropertobeafootballfanbyChristmas B.theteamownerwrotebacktoBillbyemail C.thenotefromtheteamownermeantalottoBill D.Bill'sparentswouldalsobefansofthePanthers 5Thebesttitleforthepassagecanbe. A.ChristmasGift B.HelpfulMother C.ReceivingaHelmet D.ChoosingaTeam
Fearanditscompanionpainaretwoofthemostusefulthingsthatmanandanimalspossessiftheyareused.Iffiredidn'thurtwhenitburnedchildrenwouldplaywithituntiltheirhandswereburnedaway.Similarlyifpainexistedbutfeardidn'tachildcouldburnitselfagainandagainbecausefearwouldnotwarnittokeepawayfromthefirethathadburntitbefore.Areallyfearlesssoldier﹣andsomedoexist﹣isnotagoodsoldierbecauseheissoonkilledandadeadsoldierisofnousetohisarmy.Fearandpainarethereforetwoguardswithoutwhichmanandanimalsmightsoondieout. Inourfirstsentencewesuggestedthatfearoughttobeproperlyused.Ifforexampleyounevergooutofyourhousebecauseofthedangerofbeingknockeddownandkilledinthestreetbyacaryouarelettingfearruleyoutoomuch.Theimportantthingisnottoletfearruleyoubutinsteadtousefearasyourservantandguide.Fearwillwarnyouofdangersthenyouhavetodecidewhatactiontotake. Inmanycasesyoucantakequickandsuccessfulactiontoavoidthedanger.Forexampleyouseeacarcomingstraighttowardsyoufearwarnsyouyoujumpoutofthewayandalliswell. Insomecaseshoweveryoudecidethatthereisnothingthatyoucandotoavoidthedanger.Forexampleyoucannotpreventanairplanecrashingintoyourhouseandyoumaynotwanttogoandliveinadesertwheretherearenoairplanes.Inthiscasefearhasgivenyouitswarningyouhaveexamineditanddecidedonyourcourseofactionsofearoftheparticulardangerisnolongerofanyusetoyouandyouhavetotrytoovercomeit. 1Whywouldchildrenplaywithfirerepeatedlyeveniftheyhadbeenburnedbefore? A.Theyhadnofearoffire. B.Theywerenotwelleducated. C.Theyhadnosenseofpain. D.Theywantedtobefearlesssoldiers. 2HowdoyouunderstandtheunderlinedpartinParagraph2? A.Youmustkeepcalminfaceofdanger. B.Youneedsomeonetoserveyouathome. C.You'dbetterstayinthehouseinfearofdeath. D.Youshouldn'tbecontrolledbutservedbyfear. 3Whatcanweinferfromthetext? A.Fearisalwayssomethinghelpful. B.Toomuchfearisusuallyharmful. C.Fearissomethingthatcanbeavoided. D.Fearshouldbeusedasourguideinlife. 4Thebesttitleforthispassageshouldbe. A.TheValueofFear B.PainandActions C.NoPainsNoGains D.WaystoAvoidDanger
某同学设计了一个前进中的发电测速装置如图所示．自行车的圆形金属盘后轮置于垂直车身平面向里的匀强磁场中后轮圆形金属盘在磁场中转动时可等效成一导体棒绕圆盘中心O转动．已知磁感应强度B＝0.5T圆盘半径r＝0.3m圆盘电阻不计．导线通过电刷分别与后轮外边缘和圆心O相连导线两端ab间接一阻值R＝10Ω的小灯泡．后轮匀速转动时用电压表测得ab间电压U＝0.6V．则可知
如图甲为一种门后挂钩的照片相邻挂钩之间的距离为7cm图乙中斜挎包的宽度约为21cm在斜挎包的质量一定的条件下为了使悬挂时背包带受力最小下列措施正确的是
如图abcd是一个质量为m边长为L的正方形金属线框．从图示位置自由下落在下落h后进入磁感应强度为B的匀强磁场恰好做匀速直线运动．该磁场的宽度也为L．在这个磁场的正下方2h+L处还有一个未知的匀强磁场图中未画出．金属线框abcd在穿过这个磁场时也恰好做匀速直线运动．那么下列说法正确的是
Ofcourseshewasn'treallymyauntandoutoffearInevercalledherthattoherface.IonlyreferredtoherasMyAuntFanniebecausethenamealwaysmademyfatherlaughquietlyandgavemymothercausetolookstrictlyatbothofus﹣atmeforbeingdisrespectfulofmyelderandatmyfatherforencouragingmybadbehavior.IenjoyedbothreactionssoIlookedforeveryopportunitytoworkthenameintoasmanyconversationsaspossible. AsayoungwomanmymotherhadworkedinthekitchenofalargeVictorianfarmhouse.DuringthoseyearsmymotherhelpedAuntFannymakethebestblueberryjamevertastedbyanyoneinGlenfield.Shewaswell﹣knownforherjamandforneversharingtherecipewithothers.EventhoughmymotherknewtherecipebyheartaslongasAuntFanniewasaliveshenevermadethejamwithoutAuntFannieinourkitchentodirecttheprocessandkeepthesecret. EachAugustmymotherwouldpreparemeforAuntFannie'svisit.OneyearafterIhadhelpedwiththejamprocessAuntFanniegavemeacoinandthenmademepromisethatIwouldneverspendit.Holdontothiscoinshesaidandsomedayyouwillberich.Istillhavemyveryfirstcoingiventomebymygrandmother.SoIkeptthecoininasmallboxandwaitedtobecomerich. InowhavetheblueberryjamrecipeandthecoinfromAuntFannie.Inpeople'seyesAuntFannie'ssuccessresultedfromthatsecretrecipe.Buttomeitwasjustacommonrecipe.NeitherhavemademebecomearichpersonbutIkeepthemasreminderstoholdontothevaluablethingsinlife.Moneycanmakeyoufeelrichforawhilebutitistherelationshipsandthememoriesoftimespentwithfriendsandfamilythattrulyleaveyouwealthy.Andthatisafortunethatanyonecanbuild. 1WhydidtheauthoralwaysusethenameMyAuntFannieinconversations? A.ShelikedAuntFannie'srecipe. B.ShewasfrightenedofAuntFannie. C.Sheenjoyedherparents'reactions. D.ShegreatlyrespectedAuntFannie. 2TheunderlinedwordsheinParagraph2refersto. A.AuntFannie B.theauthor'sgrandmother C.theauthor'smother D.AuntFannie'sgrandmother 3Inthelastparagraphtheauthorencouragesreadersto. A.holdontothefirstcoininlife B.makeasmanyfriendsaspossible C.makemoneywiththeirownhands D.spendmoretimewithfamilyandfriends 4Whatcouldbethebesttitleforthispassage? A.TheKeytoSuccess B.BlueberryJamRecipe C.AFortuneBuiltfromaCoin D.ARelationshipofTrust
Myfamilyoftenhadaget﹣togetherwithfriendsinmychildhood.AsIwassmarttherewasalwayssomeonewhowouldcomeuptomentionmyhigh1andaskWhatareyougoingtodowhenyou2? Wellitstartedoutbeingateacherorahero.3itwasafiremananartist…AsIgrewoldermydreamsofthefuture4.WhenIwasgoingtocollegeIwasaskedWhatwillyoumajorin?anotherquestion5tofindoutwhatIwouldbewhenIgrewup. BythenImadeupmymindtobecomea6programmer.SoIwasstudyingsoftwareformuchofmylife.Iam7thatIcouldrealizemydream.Therealizationofmylifepurposeencouragesmetohelpotherstosucceedintheirown8. Howeverformanythereisa9whichgoesaroundstealingourdreamsandrobbingusofthe10mentalstatetoachieveour11.Sometimesthethiefwillcomeasaparentarelativeorafriend12thegreatestthiefisjustourselves. Usuallywhenweareaboutto13theaimasmallvoiceinsidewillsayYouwillnever14.Veryfewhaveeverdonethissuccessfully.Andonandonthesmallvoicemakesus15heartandfail. Failure16helpsourdreamstocometrue.Itisoneofthemostimportant17wehavebecauseitteachesus18lessons.Andwhenwelearntheselessonswellweare19forsuccess. Therearenoovernightsuccessesbutwithperseverancetheywillcome.Sojustdon't20.Letdreamsstayinyourlife. 1A.intelligence B.power C.quality D.character 2A.getup B.pickup C.growup D.setup 3A.Later B.Before C.Recently D.Meanwhile 4A.kept B.changed C.formed D.continued 5A.imagined B.designed C.supposed D.answered 6A.car B.radio C.computer D.satellite 7A.surprised B.happy C.interested D.worried 8A.studies B.work C.lives D.experience 9A.thief B.parent C.friend D.relative 10A.same B.only C.necessary D.exact 11A.results B.advantages C.power D.goals 12A.so B.because C.and D.but 13A.reach B.select C.leave D.remove 14A.fail B.succeed C.arrive D.forget 15A.break B.lose C.give D.take 16A.though B.instead C.besides D.otherwise 17A.purposes B.tools C.messages D.medicines 18A.logical B.hopeless C.thankful D.valuable 19A.responsible B.sorry C.angry D.ready 20A.takeapart B.giveup C.bringback D.setoff
如图所示由竖直轴和双臂构成的“Y”型支架可以绕竖直轴转动双臂与竖直轴所成锐角为θ．一个质量为m的小球穿在一条臂上到节点的距离为h小球始终与支架保持相对静止．设支架转动的角速度为ω则
如图所示在边长为a的正方形ABCD区域包含边界内有一匀强磁场磁场方向垂直纸面向里．E点是AB边上的一点且AE之间的距离为．将一电子从E点沿EB方向射出若初速度为v1其运动轨迹将与BC边相切若初速度为v2其运动轨迹将与CD边相切．则v1与v2之比为
在“描绘小灯泡的伏安特性曲线”的实验中现除了有一个标有“2V0.6W”的小灯泡导线和开关外还有以下可供选择的器材． A．电源电动势约为3V内阻可不计 B．电流表量程0～3A内阻约为0.1Ω C．电流表量程0～300mA内阻约为2Ω D．电压表量程0～15V内阻约为20kΩ E．电压表量程0～2.5V内阻约为5kΩ F．滑动变阻器最大阻值5Ω允许通过的最大电流为2A G．滑动变阻器最大阻值1kΩ允许通过的最大电流为0.5A 实验要求小灯泡两端的电压从零开始变化并能测多组数据． 1实验中电流表应选用电压表应选用滑动变阻器应选用均用序号字母表示 2请在图甲所示的虚线框内补画出满足实验要求的电路图 3图乙为通过实验描绘小灯泡的U﹣I图象．现将两个这样相同的小灯泡并联后再与一个4Ω的定值电阻R串联接在内阻为1Ω电动势为3V的电源两端电路中电流表内阻忽略不计如图丙所示则通过每盏小灯泡的电流强度约为A．此时定值电阻R的电功率约为W．
HavingstayedinAmericafor5yearsheisabletospeak流利的English.
AfewyearsagomyhusbandandIwereonanislandforaweekwithourtwolittledaughters.Aswetalkedaboutwhattodonextourdaughtersjumpedinandtoldusexactlywhattheywantedtodo.Weagreed. AssoonaswewalkedintothemainareaofButterflyMuseumwesawthousandsofbeautifulbutterflies.Theyallflewwiththeircolorfulwings.Mygirlswerejumpingupanddown.AndIknewwehadmadetherightdecisiontocometothemuseum.Theywerehavingsomuchfun. IturnedtoourguideandaskedcuriouslyHowlongdobutterflieslive?shesaidAbouttendays. Whatcanbutterfliesdointendays? TheguidestoppedlookedatmeandsaidTheymaketheworldamorebeautifulplace. AfterwesaidgoodbyeIcouldn'tstopthinkingaboutwhattheguidehadsaid.Shewasright.Weallhavesomethingtooffertheworld.Ifweallspendtimedoingwhatwecandoforotherswecanmaketheworldabetterplace. 1Whatdidthegirlswanttodo? A.Gotovisitanisland. B.VisitButterflyMuseum. C.Listentotheguide. D.Maketheworldbeautiful. 2Whatmadethewriterthinktheyhadmadetherightdecision? A.Theywerewelcomeinthemuseum. B.Shesawthousandsofbeautifulbutterflies. C.Herdaughterswerehavingagoodtime. D.Sheknewhowlongbutterflieslived. 3Theunderlinewordcuriouslymeans. A.害怕地 B.自豪地 C.好奇地 D.愤怒地 4Howcanwemaketheworldabetterplace? A.Byvisitingsomemuseums. B.Bytalkingwithaguide. C.Bylivingahappyandhealthylife. D.Bydoingwhatwecandoforothers. 5Whichisthepropertimeorder顺序ofwhathappened? a.ThegirlsenjoyedthemselvesinButterflyMuseum. b.MyhusbandandItalkedaboutwhattodonext. c.Theguidetoldmehowthebutterfliesspenttheirlife. d.Ikeptthinkingabouttheguide'swords. A.b→a→c→d B.a→b→d→c C.a→d→b→c D.a→b→c→d
TimJeffdoyoupreferworkinginagrouporworkingalone? JeffI'mgoodat1workbymyselfbecauseifIamdoingsomethingIlikeIcangetit2doquickly.3ifIamworkingwithateamwherepeopleallwanttodoagoodjobIthink4teamisfun. TimDoyoupreferworkingwearingauniformorputtingwhateveryouwant? JeffIthink5youwearauniformsometimesyougetrespect. TimSohowaboutaworkingschedule?Wouldyoupreferasettimejob? JeffNo.Ithink6isdifficulttodoasettimejob.LastyearI7producefurnitureinafactory.EverymorningIhadtogetupatsix.WhenIgothome8workitwasalmosteight. TimYou9beverytired.Bythewaydoyoupreferbeingpaidbythehourordoyouprefersalary? JeffIthinksalarymaybea10goodwaytogothanbeingpaidbythehour.
Hepublishedanew系列ofarticlesforstudentsofEnglish.
Iranintoastrangerashepassedby.Ohexcusemepleasewasmy1.HesaidPleaseexcusemetooIwasn'twatchingforyou.Wewerevery2thisstrangerandI.Wewentonourwayandwesaidgoodbye.Butathomea3storyistold. LaterthatdaywhenIwascookingtheeveningmealmydaughterstoodbesidemevery4.WhenI5Inearlyknockedherdown.Moveoutofthe6Isaidwithafrown.Shewalkedawayherlittleheartbroken.Ididn't7howharshly严厉地I'dspoken. WhileIlayawakeinbedthateveningmyhusbandsaidtomeWhile8astrangeryouarepolitebutwiththegirlyouloveyouare9.Gotolookonthekitchenflooryou'llfindsomeflowersbythedoor.Thosearetheflowersshebroughtto10.Shepickedthemherselfpinkyellowandblue.Shestoodquietlynotto11thesurpriseandyou12sawthetearsinhereyes. 13mytearsbegantofall.Iquietlywentandkneltdownbyherbed.WakeuplittlegirlIsaid.Aretheseflowersyoupickedforme?ShesmiledIfoundthemoutbythetree.Ipickedthem14they'reprettylikeyou.Iknewyou'dlikethemespeciallytheblue. IsaidDaughterI'msorryforthewayI15today.I16haveyelledatyouthatway. ShesaidOhMomthat'sokay.Iloveyouanyway. IsaidDaughterIloveyoutoo.AndIdoliketheflowersespeciallytheblue. Ihadgottheworld17again.I'd18tobepolitetopeopleinthestreet﹣good19makesocietywork.Butastrangerissomeonewebumpintoonceandthenneverseeagain﹣and20isforlife. 1A.answer B.words C.reply D.speech 2A.careful B.polite C.serious D.unhappy 3A.interesting B.meaningful C.similar D.different 4A.still B.noisy C.upset D.excited 5A.called B.turned C.returned D.removed 6A.house B.space C.way D.area 7A.realize B.care C.prove D.understand 8A.referringto B.listeningto C.dealingwith D.pickingup 9A.anxious B.patient C.disappointed D.unkind 10A.us B.you C.thefamily D.herfriends 11A.ruin B.expect C.announce D.handle 12A.seldom B.simply C.even D.never 13A.Bythistime B.Atonetime C.Foratime D.Atthesametime 14A.while B.so C.unless D.because 15A.considered B.acted C.developed D.performed 16A.shouldn't B.couldn't C.wouldn't D.mustn't 17A.clear B.right C.beautiful D.meaningful 18A.begin B.learn C.continue D.change 19A.manners B.habits C.lifestyle D.behaviors 20A.lover B.companion C.family D.friend
Althoughwearesufferingsuchaseverenatural灾难wewillneverloseheart.
Dr.Johnsonand1havebeentryingtobuildhimup体格上.
Suchadietiswidelybelievedtooffer保护againstanumberofcancers.
随着科幻电影流浪地球的热映“引力弹弓效应”进入了公众的视野．“引力弹弓效应”是指在太空运动的探测器借助行星的引力来改变自己的速度．为了分析这个过程可以提出以下两种模式探测器分别从行星运动的反方向或同方向接近行星分别因相互作用改变了速度．如图所示以太阳为参考系设行星运动的速度为μ探测器的初速度大小为v0在图示的两种情况下探测器在远离行星后速度大小分别为v1和v2．探测器和行星虽然没有发生直接的碰撞但是在行星的运动方向上其运动规律可以与两个质量不同的钢球在同一条直线上发生的弹性碰撞规律作类比．那么下列判断中正确的是
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.每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. 删除把多余的词用斜线\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. Questioningcanleadtosearchingforananswer.Ifweareinthehabitofaskingwhetherthatwearetoldistruewecanfindthecorrectanswerandlearnmore. TwoyearsagoourteacherMr.Alexofferedusananswerofadifficultmathprobleminclass.BecausetheanswerseemedalittlestrangenobodybutIdoubtedit.ThoughtthathissolutionmightbewrongIcarefullyanalyzedtheproblemandtrytoworkitoutinadifferentway.HalfahourlaterImanagedtofindthecorrectanswer.WhenIshowedmyanswertohertheteacherpraisedmeformyindependentlythinking. FromthisexperienceIhavebeenlearntthatquestioningcanserveasabridgehelpsustoseekthetruth.
﹣LilyIknowyou'reconfidentaboutgettingthatjobbutremember.Sowhynotsendyourapplicationformstoafewmorecompanies? ﹣Soundsgood. A.don'tputallyoureggsinonebasket B.theearlybirdcatchestheworm C.actionsspeaklouderthanwords D.amissisasgoodasamile
如图甲所示两平行金属板MNPQ的板长和板间距离相等板间存在如图乙所示的随时间周期性变化的电场电场方向与两板垂直不计重力的带电粒子沿板间中线垂直电场方向源源不断地射入电场粒子射入电场时的初动能均为Ek0已知t＝0时刻射入电场的粒子刚好沿上板右边缘垂直电场方向射出电场．则
如图在xOy坐标平面第一象限内x≤1m的范围中存在以y＝x2为上边界的沿y轴正方向的匀强电场场强大小E1＝2.0×102N/C．在直线MN方程为y＝1m的上方存在方向垂直纸面向里磁感应强度为B的匀强磁场．在x＝﹣1m处有一与y轴平行的接收板PQ板两端分别位于MN直线和x轴上在第二象限MN和PQ围成的区域内存在沿x轴负方向的匀强电场场强大小为E2．现有大量的带正电粒子从x轴上0＜x≤1m的范围内同时由静止释放粒子的比荷均为＝1.6×105C/kg不计粒子的重力及其相互作用． 1求在x＝0.5m处释放的粒子射出电场E1时的速度大小 2若进入磁场的所有带电粒子均从MN上同一点离开磁场求磁感应强度B的大小 3若在第2问情况下所有带电粒子均被PQ板接收求电场强度E2的最小值和在E2最小的情况下最先打在接收板上的粒子运动的总时间．
假如你是红星中学的李明某英语报正在招募青少年英语记者你有意应聘请你根据以下提示给报社写一封自荐信. 要求 1.语言通顺意思连贯 2.词数不少于80词. 3.文章的开头和结尾已经给出不计入总词数. DearSir/Madam MynameisLiMing. I'mlookingforwardtoyourreply.Iwouldgreatlyappreciateitifyoucouldgivemethechance. Yourssincerely LiMing
某同学做了一个趣味实验如图所示有两个弹性小球AB重叠放置质量分别为m1m2两球球心在同一竖直线上．现让它们在距水平地面高h处由静止释放落地时认为小球B先与地面碰撞再与小球A碰撞小球A碰后能上升的最大高度为H．所有的碰撞都是弹性碰撞碰撞时间忽略不计碰撞前后两小球都在竖直方向运动两小球均可视为质点不计空气阻力．下列说法正确的是
如图所示倾角为θ＝37°的足够长的固定斜面上叠放着质量为M＝0.4kg的足够长的木板A和质量为m＝0.2kg的物块B可视为质点A与斜面A与B间的动摩擦因数分别为μ1＝0.25μ2＝0.75．开始时A下端与固定挡板C对齐B与C间的距离L0＝0.135m．t＝0时将A由静止释放同时B以v0＝0.9m/s的速度沿板下滑极短的可不计的时间内给B沿板向下的冲量B获得初速度v0．已知接触面间的最大静摩擦力与滑动摩擦力大小相等B与C碰撞时间极短可不计且碰撞前后B速度大小不变A与C不会接触取g＝10m/s2sin37°＝0.6cos37°＝0.8．求 1从B开始运动到与C第一次碰撞所经过的时间t1和这段时间内A运动的位移大小x1 2B第二次与C碰撞前瞬间速度大小v2和B第一次碰撞C到第二次碰撞C经历的时间t2 3从B开始运动起在t＝1.5s时间内系统产生的总热量Q．
Afteryearsofresearchandtestingthehybridcarwasdevelopedandputonthemarket.It'saninterestingandexcitingnewimprovementintoday'sworldaswelookforbetterwaystoprotectthequalityoftheairwebreatheandconserveournaturalresources. Thequalityofourairisaffectedbymanydifferentthings.Butoneofthelargestsourcesofairpollutionistheburningoffossilfuelssuchascoalandgasolinewhichisusedtopoweracar'sengine.TheEPAhassetnationalstandardstohelpcontrolthelevelofharmfulpollutantssentoffintotheairandtheautomobileindustryhasactedbyproducingahybridcarthatuseslessgasandthereforecauseslesspollution. Ahybridcarisacombinationofaregularcarthatrunsongasolineandanelectriccarthatisbatterypowered.Somepeopletendtothinkthatsincethehybridcarispartiallyelectricyouhavetoplugitintochargeit.Butthat'snothowitworks.The144voltbatterypackisactuallyrechargedthroughtheenergythatisproducedwhenthecar'sbrakesareused.Thisisreferredtoasregenerativebrakingbecauseitgenerateselectricity. Althoughthehybridcarstillrunsongasolinemostofthetimethishelpsituselessgasthanaregularcar.Whenthedriverstopsatatrafficlighttheengineautomaticallyshutsofftosavefuel.Thenassoonasthedriverputsthecaringearandtouchesthegaspedaltheenginestartsbackup. Haveyoueverriddeninacarwithsomeonewhoranoutofgas?Thatprobablywouldn'thappenifyouwereridinginahybridcar.ItflashesawarningonitscomputerscreenthatsaysIamlowongas.WhenitcompletelyrunsoutthewarningreadsYOUARENOWOUTOFGAS!Thentheelectricpowersupplykicksintoletthedrivertravelafewmoremilestoagasstation. 1Whichofthefollowingistrueaccordingtothepassage? A.Thehybridcarwillbeputonthemarket. B.Hybridcarsrunfasterthanregularcars. C.Whenthehybridcarstopsatatrafficlightthedriverwillgetawarning. D.Theburningoffossilfuelsisoneofthelargestsourcesofairpollution. 2Accordingtothepassagethewordhybridrefersto. A.ahigh﹣techdiscovery B.energysaving C.anewinvention D.acombinationoftwothings 3Regenerativebreakingisanimportantprocessofthehybridcarbecause. A.itallowsthecartocometoaquickstop B.itgivesthedriverasmootherride C.itproducesenergytochargethebattery D.itcancontrolthespeedofthecar 4WhichofthefollowingisrightabouttheEPA? A.Theydesignedhybridcars. B.Theyoutlawed宣布……为不合法theburningoffossilfuels. C.Theysetimportantguidelinesthathelpcontrolpollution. D.Theirmainpurposeistoprotectendangeredplantsandanimals. 5Whichofthefollowingisthereasonfordevelopinghybridcars? A.Theyuselessgasthanregularcars. B.They'resafertodrivethanmostcars. C.They'remoremodernthanothercars. D.Theycostlessthanregularcars.
如图所示开口向下的“┍┑”形框架两侧竖直杆光滑固定上面水平横杆中点固定一定滑轮两侧杆上套着的两滑块用轻绳绕过定滑轮相连并处于静止状态此时连接滑块A的绳与水平方向夹角为θ连接滑块B的绳与水平方向的夹角为2θ则AB两滑块的质量之比为
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一上学期英语
高一下学期化学
高一下学期物理
高三下学期数学
湘公网安备 43130202000226号