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小代家新买了储水式电热水器，其工作原理图如图．使用前，小代仔细阅读说明书知道电热水器的两根加热管电阻相同功率有高、中、低三档．当S1断开，S2接b时，其功率为低档大小为1000W． （1）请指出...
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如图是小林家里电热水器的工作原理图两根加热管电阻相同.电热水器功率有高中低三档.当S.1断开S.2接
小王家电能表上标有220V10A字样他家原有电器的总功率是1500W最近新买了一个额定功率为1100
小梦家居住的小区物业将业主的电能表设置为剩余2度电时将自动切断家庭用电家中停电后小梦随即拿电卡买了2
以下对即热式电热水器描述正确的是
即热式热水器特点是即开即热，几乎没有热损耗，无需等待。
体积小、安装灵活、功率高
工作电流大，须使用单独电源线路和专用插座、插头
储水式热水器比即热式热水器能效高
小代家新买了储水式电热水器其工作原理图如图．使用前小代仔细阅读说明书知道电热水器的两根加热管电阻相
无水箱式电热水器具有体积小加热快的优点图甲是它的工作原理图.1温控器水温传感器测量到出水温度并将信息
10·柳州在家电下乡现场小聪看到某品牌的电热水器和燃气式快速热水器铭牌如下1一般情况下热水淋浴要求水
小明家电能表上标有220V10A字样他家原有电器的总功率是1500W最近新买了一个电热水器铭牌上部分
6.00分小代家新买了储水式电热水器其工作原理图如图．使用前小代仔细阅读说明书知道电热水器的两根加
储水式电热水器是第代热水器
二
三
四
五
六
一
以下最省电的电热水器是
储水式电热水器
即热式电热水器
热泵热水器
普通热水器
如果电热水器在一年中的使用时间较长可以优先选择电热水器从而节省电能
储水式；
即热式；
热泵式；
普通式
无水箱式电热水器具有体积小加热快的优点图甲是它的工作原理图.1温控器水温传感器测量到出水温度并将信息
小王家电能表上标有220V10A字样他家原有电器的总功率是1500W最近新买了一个额定功率为1100
小王家电能表上标有220V10A字样他家原有电器的总功率是1500W最近新买了一个额定功率为1100
小明家新买了一个电热水器刚接入电路家里的空气开关就断开了他猜想造成空气开关断开的原因是:①连入电路
无水箱式电热水器具有体积小加热快的优点图甲是它的工作原理图.1温控器水温传感器测量到出水温度并将信息
如图甲乙丙分别是江涛网购的速热式电热水器实物图说明书部分参数及等效工作电路图图中R.是给水加热的电阻
小丽家新买了一台电热水器如图17所示数据是该热水器的一些技术参数现将水箱中装满水通电后正常工作40m
小芸爸爸在商店选中一款速热式电热水器小芸阅读说明书后知道该电热水器的额定功率是4400W.额定电压是
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在“探究加速度与力质量的关系”的实验中 1对于本实验以下说法中正确的是 A．砂和桶的总质量要远大于小车的总质量 B．每次改变小车质量后需要重新平衡摩擦力 C．实验中也可不测加速度的具体数值只要测出不同情况下加速度的比值就行了 D．若要验证“加速度与力的平方成正比”这一猜想在作图线时最好以F2为横坐标 2某同学在接通电源进行实验之前将实验器材组装如图1所示下列对此同学操作的判断正确的是 A．打点计时器不应固定在长木板的最右端而应固定在靠近定滑轮的那端 B．打点计时器不应使用干电池而应使用交流电源 C．不应将长木板水平放置而应在右端垫起合适的高度平衡摩擦力 D．小车初始位置不应离打点计时器太远而应靠近打点计时器放置 3改正实验装置后该同学顺利地完成了实验．在实验中保持拉力不变得到了小车加速度随质量变化的一组数据如下表所示 请你在图2方格纸中建立合适坐标并画出能直观反映出加速度与质量关系的图线． 4从图线可得出拉力大小为结果保留两位有效数字． 5保持小车质量不变改变砂和砂桶质量某同学根据实验数据作出了加速度a随合力F的变化图线如图3所示．此图中直线发生明显弯曲的原因是．
求下列各式字母的取值范围．
TheMetropolitanMuseumofArtMetisoneoftheworld'slargestandfinestartmuseums.Followingthesuggestedroutewillhelpyouexplorethemuseum.TheTempleofDendurThis2000﹣year﹣oldbuildingstoodneartheNileRiversurroundedbyawallthatnolongerexists.Butyoucanstillpeekthroughthegateway.Whose'house'isthis?It'snotforpeople.It'sforgods.Canyouidentifythem?Theyfaceout.Akingfacesinbringingofferings.MetSpeaksBringingtogethersomeofthemostrespectedthinkersonagivensubjectMetSpeaksfeatureslecturesdiscussionstalksfilmsandforumsinwhichcompellingvoicesexploretimelyissuesthatconnecttotheMet'sexhibitionsandpermanentcollection.Programtimesaudiencesandtopicsvary.TimetoSketchSettledownforafewminutespicksomethinginthisgalleryandhavefundrawingit.Enjoythechancetolookcarefullyasyoucreateyourownsketch.You'llbesurprisedathowmuchmoreyounoticethankstoexploringartbysketching.MetAccessMaketheMetyours!Choosefromavarietyofservicesandexcitingprogramsthataretailoredtomeettheneedsofvisitorswithdisabilities.Programtimesaudiencesandtopicsvary.AskfortheAccessInformationbrochureandAccessCalendaratInformationDesksdownloadtheAccessCalendarPDForcall212﹣650﹣2010oremailaccess@metmuseum.org.AdmissionFeeincludesadmissiontotheMainBuildingandsame﹣weekadmissiontotheCloistersmuseumandgardens.1Howmuchisrecommendedtopayfor3adultand2studentvisitors?A.﹩99B.﹩111C.﹩87D.﹩1032WhatcanyouknowabouttheTempleofDendur?A.Ahighwallissurroundingthe2000﹣year﹣oldbuildingnow.B.Akingfacesoutbringingofferingsinthetemple.C.ThebuildingisdesignedforEmperortolivein.D.TheNileRiverwitnessedthehistoryofthebuilding.3WhichofthefollowingisTRUEabouttheMet?A.IssuesconnectedwitheconomiccrisiswillbediscussedinMetSpeaks.B.Visitorscanchoosesomethinginthegalleryandhavefundrawingitonthewall.C.Disabledpeoplewillfindvariousservicesandprogramsofferedespeciallyforthem.D.Youcanemailaccess@metmuseum.orgformoreAdmissioninformation.
一质点在某段时间内做曲线运动则在这段时间内
如图所示沿水平方向做匀变速直线运动的车厢中悬挂小球的悬线偏离竖直方向37°角小球和车厢相对静止球的质量为1kg．g取10m/s2sin37°＝0.6cos37°＝0.8 1求车厢运动的加速度并说明车厢的运动情况． 2求悬线对球的拉力．
ThereisawonderfulstoryaboutJimmyDuranteoneofgreatsingers.1asktobeapartofashowforsomeoldWorldWarⅡsoldiershetoldthemhewasverybusyandhecouldaffordonlyafewminutes2hewouldcomeiftheywouldn'tmindhissingingoneshortsongandimmediatelyleavingforhisnextappointment.Ofcoursetheshow'sdirectoragreed3happy.ButwhenJimmygotonstagesomethingsurprisinghappened.Hewentthrough4shortsongandthenstayed.Theapplausegrewlouderandlouderandhekept5stay.Prettysoonhehadbeenonstage6fifteentwentyandthenthirtyminutes.Oneofhis7assistbehindthestagestoppedhimandsaid'Ithoughtyouhadtogoafterafewminutes.Whathappened?'Jimmyanswered'IdidhavetogobutIcanshowyouthereasonwhyIstayed.Youcanseefor8youifyoulookatthefrontrow.'Inthefrontrowweretwomenbothof9hadlostanarminthewar.Onehadlosthisrightarmandtheotherhadlosthisleft.Togethertheywereabletoclapandthatwasexactlywhatthey10doloudlyandcheerfully.
常用的电磁打点计时器和电火花计时器使用的是填“直流电”“交流电”正常工作时每隔s打一个点．
某校有高一学生n名其中男生数与女生数之比为65为了解学生的视力情况现要求按分层抽样的方法抽取一个样本容量为的样本若样本中男生比女生多12人则n＝
某几何体的三视图如图所示则该几何体的体积为
如图所示水平桌面上叠放着AB两物体均与桌面相对静止不动则B物体受力个数为
一辆汽车沿笔直的公路行驶第1s内通过5m的距离第2s内和第3s内各通过20m的距离第4s内又通过15m的距离求汽车在最初2s内的平均速度和这4s内的平均速度各是多少
下列说法中哪些表示的是时刻
将下列各数开平方．
已知集合A＝{x∈N|x＜3}B＝{x|x2﹣x≤0}则A∩B＝
求下列各式字母的取值范围．
判断无理数都是开方开不尽的数．判断题
如图所示为AB两运动物体的位移图象．下述说法中正确的是
Whenwegiveourkidsholidaygiftsmanyofuscan'twaittoheartheirappreciativecriesof'thankyou!'oncethewrappinggetsrippedoff.Buthere'satip:You'dbewisenottoexpectmuchgratitudefromthemforwhattheyreceive.Gratitudecanmakeushappierhealthierandevenfitter.Butdothekidsshowtheirgratitudeforthestuffwebuythem?AlltheresearchI'vedonehasconvincedmethatitwon'thappen.Onemomtoldmethatwhensheaskedher16﹣year﹣oldsontothankherforbuyinghimacellphonehesaid'Butthat'swhatmomsshoulddo.'Fromateenager'sangleit'saparent'sresponsibilitytotakecareofthefamily.AccordingtoDunhamYale'sassistantprofessorofpsychology'Whenteenagerscodeitthatwayagiftisnolongersomethinggivenfreelyandvoluntarily'﹣it'sjustmomanddadlivinguptotheirobligation.Parentsdohavetherighttodemandgoodmannersandchildrenshouldthanksincerelywhoevergivesthemsomething.Butkidscan'tknowhowblessedtheyareunlesstheyhaveabasisforcomparison.Andtheydon'tlearnthatbyaparentcomplainingthatthey'reungrateful.Weneedtogiveourchildrenthegiftofawiderworldview.Showbyexamplethatgratitudeisn'taboutstuff﹣whichultimatelycan'tmakeanyofushappyanyway.It'saboutrealizinghowluckyyouareandpayingyourgoodfortuneforward.Youcancollectallthecharitableappealsandsitdowntogetherwiththekidstogothroughthem.Yousetthebudgetforgivingandthekidsdecidehowit'sdistributed.Oncetheconversationaboutgratitudegetsstartedit'smucheasiertocontinueallyear.Alsoyoucansetupafamilyroutineatbedtimewherekidsdescribethreethingsthathavemadethemgrateful.Whenkidsgoofftocollegeyoucantextthemapictureeachweekofsomethingthatinspiresyourappreciation.Teachingchildrentofocusonthepositiveandappreciatethegoodintheirlivesisperhapsthegreatestgiftwecangivethem.Andwecanalllearntogetherthatthethingsthatreallymatteraren'tonsaleatadepartmentstore.1Howdochildrenrespondwhenreceivinggiftsfromtheirparents?A.Theyshownointerestintheirparents'gifts.B.Theycan'twaittoopentheirparents'gifts.C.Theyshowmuchgratitudetotheirparentsforthegifts.D.Theytaketheirparents'giftsforgranted.2Tomakechildrengratefulforwhattheyhaveparentsshould.A.liveuptotheirobligationB.asktheirchildrentohavegoodmannersC.teachtheirchildrenbysettinganexampleD.complaintheirchildrenareungrateful3Whatcanwelearnfromthelasttwoparagraphs?A.Nogiftsaregreaterthanteachingchildrentobepositiveandgrateful.B.Childrenoughttorealizehowluckytheyaretohaveconsiderateparents.C.ChildrenaresupposedtodecidehowtodistributetheirownmoneyD.Itiseasyforparentstostarttheconversationaboutgratitude.4What'sthepurposeoftheauthorwritingthistext?A.Toexplainthereasonwhychildrenoffernogratitudetotheirparents.B.Togiveadvicetoparentsonhowtohelpchildrendevelopgratitude.C.Toencourageparentstodothingstogetherwiththeirchildren.D.Toremindparentsoftheirresponsibilitytoeducatetheirchildren.
将下列各数开平方．36
设xy满足约束条件则z＝x+y的最大值与最小值的比值为
有关滑动摩擦力的下列说法中正确的是
一质量为5kg的滑块在F＝15N的水平拉力作用下由静止开始做匀加速直线运动若滑块与水平面间的动摩擦因数是0.2g取10m/s2问 1滑块运动的加速度是多大 2滑块在力F作用下经5s通过的位移是多大 3如果力F作用8s后撤去则滑块在撤去F后还能滑行多远
判断有理数都是有限小数．判断题
将下列各数开平方．1
求下列各式的值．
Forcollegestudentsgraduationsignalsanexcitingnewbeginning.1Manystudentswonder:WhatdoIdonow?Whatcareerisbestforme?Mostexpertadviceonchoosingcareersboilsdowntothefollowingpoints.KnowingYourselfWhatareyourinterests?Abilities?Skills?2Theresultsmaysurpriseyou!Thesecanbeusefulbutthey'renotthelastword.InvestigatingInvestigatingoccupationsismuchmoredifficult.Formostpeoplethereisn'tjustone‘right'jobbutseveralthatcouldbesatisfying.3Talktopeoplewhohaveoccupationsthatinterestyou.Findoutwhattheylikeanddislikeabouttheirjob.4Manypeoplechoosetheircareersbecausetheybelievestronglyinaparticularcause.Somemightchoosetoworkinareaslikemedicinecharityorenvironmentalprotection.Somehaveastronginterestinhistoryoraloveforthearts.5Soincaseslikethesethefieldisoftenchosenfirstratherthantheoccupationitself.Soifyou'vechosenafieldself﹣assessmentwillhelpyoufindyourplaceinit.Investsometimeandeffortandfindtherightcareerforyou.A.Tryaself﹣assessmentquiz.B.SearchthroughbooksandWebsites.C.Findingyourplace.D.Butitcanalsobringalotofuncertaintyandconfusion.E.SeriousresearchhelpsnarrowthepossibilitiesF.Researchyourchosenfieldcarefully.Whatworkneedstobedone?Whattrainingisneeded?G.Thentheymightthinkabouteducationmuseumsorartproduction.
假定你是李华你所在的学校将要举办一场春节庆祝活动.你和你的同学邀请在你校的美国交换生Tom参加.请你写一封信给Tom要点如下:1.活动内容;2.邀请Tom一起表演一个中西合璧的节目;3.活动时间:2015年农历12月30日晚7:00﹣10:004.活动地点:学校学术报告厅.注意:1.词数100左右;2.可以适当增加细节以使行文连贯;3.开头语已经为你写好.DearTomYouhavetoldmethatyouareveryinterestedinhowweChinesecelebrateourtraditionalfestivals..Wearelookingforwardtoyourreply.YourssincerelyLiHua.
求下列各数的立方根．0
一个物体做自由落体运动如图所示的四幅图中表示其v﹣t图象正确的是
求下列各数的立方根．216
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