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如图所示是内燃机工作时的某冲程示意图，以下事例中能量的转化与其相同的是（ ）
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如图所示为内燃机工作时的某冲程示意图该冲程是冲程．
如图所示为内燃机工作时的某冲程示意图该冲程是
吸气冲程
压缩冲程
做功冲程
排气冲程
如图所示为内燃机工作时的某冲程示意图该冲程是
吸气冲程;
压缩冲程;
做功冲程;
排气冲程.
如图所示为内燃机工作时的某冲程示意图该冲程是
吸气冲程
压缩冲程
做功冲程
排气冲程
如图所示为内燃机工作时的某冲程示意图该冲程是
吸气冲程
压缩冲程
做功冲程
排气冲程
如图所示为内燃机工作时的某冲程示意图该冲程是
吸气冲程
压缩冲程
做功冲程
排气冲程
如图所示是内燃机工作时的某冲程示意图以下事例中能量的转化与其相同的是
火箭升空
用电炉加热水
衣服在阳光下暴晒升温
双手摩擦生热
2015•赤壁市模拟如图所示是四冲程汽油机工作的部分冲程示意图其中图是依靠飞轮的惯性来完成的冲程则另
如图所示为内燃机工作的某冲程示意图该冲程是冲程．在此冲程中能量的转化是．
如图所示为内燃机工作时的某冲程示意图该冲程是
吸气冲程
压缩冲程
做功冲程
排气冲程
如图所示为内燃机工作时的某冲程示意图该冲程是
吸气冲程
压缩冲程
做功冲程
排气冲程
2.00分如图所示是内燃机工作时的某冲程示意图以下事例中能量的转化与其相同的是
火箭升空
用电炉加热水
衣服在阳光下暴晒升温
双手摩擦生热
如图所示是四冲程内燃机的一个冲程示意图从进气门排气门以及活塞的运动情况可以断定这个冲程的能量转化情况
机械能转化为内能
内能转化为机械能
内能的转移
机械能的转移
如图所示是四冲程汽油机工作的部分冲程示意图其中图是依靠飞轮的惯性来完成的冲程则另一冲程中能量转化情况
如图所示是内燃机工作的冲程的示意图
如图所示为内燃机工作时的某冲程示意图该冲程是
吸气冲程
压缩冲程
做功冲程
排气冲程
如图所示是四冲程内燃机的一个冲程示意图从进气门排气门以及活塞的运动情况可以断定这个冲程的能量转化情况
机械能转化为内能;
内能转化为机械能;
内能的转移;
机械能的转移.
如图所示为内燃机工作时的某冲程示意图该冲程是
吸气冲程
压缩冲程
做功冲程
排气冲程
如图所示是四冲程内燃机的结构示意图从该内燃机的工作过程看压缩冲程与做功冲程的相同点是压缩冲程中的能量
如图3所示为内燃机工作时的某冲程示意图该冲程是
吸气冲程
压缩冲程
做功冲程
排气冲程
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若ab分别是9的两个平方根那ab=．
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．
比较大小7．
新交通法规于2013年1月1日施行驾驶员不系安全带记3分罚100元．汽车上设置了安全带指示灯提醒驾驶员系好安全带．当安全带系好时相当于闭合开关指示灯不亮安全带未系好时相当于断开开关指示灯发光．图中符合上述要求的电路图是
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.
1-的绝对值是相反数是倒数是．
已知y=+3求2x+y的值．
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
将下列各数开平方．
判断无限小数都是无理数．判断题
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
有关滑动摩擦力的下列说法中正确的是
将下列各数开平方．0.04
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
若+y+2²=0则x+y2013等于A．-1 B．1 C．32014 D．-32014
求下列各数的立方根．216
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