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如图所示小明用水平推力推静止在水平地面上箱子但箱子却没有运动下列说法正确的是
如图1点A08点B2a在直线y＝﹣2x+b上反比例函数y＝x＞0的图象经过点B． 1求a和k的值 2将线段AB向右平移m个单位长度m＞0得到对应线段CD连接ACBD． ①如图2当m＝3时过D作DF⊥x轴于点F交反比例函数图象于点E求的值 ②在线段AB运动过程中连接BC若△BCD是以BC为腰的等腰三形求所有满足条件的m的值．
AfewmonthsagoIwaspickingupthechildrenatschool.EmilyanothermotherthatIknewwellrusheduptome.Shewasfilledwithanger.DoyouknowwhatyouandIare?shedemanded.BeforeIcouldanswershegaveoutthereasonforherquestion.Shehadjustreturnedfromrenewingherdriver'slicenseatagovernmentoffice.AskedbythewomanrecordertostateheroccupationEmilyhesitateduncertainhowtoclassifyherself.WhatImeanisexplainedthewomandoyouhaveajoborareyoujusta…?OfcourseIhaveajobansweredEmily.I'mamother.Wedon'tlist‘mother'asanoccupation…‘housewife'coversitsaidtherecorderemphatically强调地. IforgotallaboutherstoryuntilonedayIfoundmyselfinthesamesituation.ThistimeitwasatourownTownHall.Theclerkwasawoman.Andwhatisyouroccupation?sheasked.WhatmademesayitIdonotknow.Thewordssimplyjumpedout.I'm…aResearchAssociateinthefieldofChildDevelopmentandHumanRelations.Theclerkpausedherball﹣pointpenfrozeninmidairandlookedupasthoughshehadnotheardright.Irepeatedthetitleslowly. MightIasksaidtheclerkwithnewinterestjustwhatyoudoinyourfield?CoollyIheardmyselfreplyIhaveacontinuingprogramofresearchinthelaboratoryandinthefield.I'mworkingformymastersthewholefamilyandalreadyhavefourcreditsalldaughters.Ioftenwork14hoursaday24ismorelikeit.Butthejobismorechallengingthanmostjobsandtherewardsareinsatisfactionratherthanjustmoney. Therewasanincreasingnoteofrespectintheclerk'svoiceasshecompletedtheformstoodupandpersonallyshowedmeout.AsIdroveintoourdrivewayIwasgreetedbymylabassistants﹣﹣﹣ages137and3.AndupstairsIcouldhearournewexperimentalmodelsixmonthsinthechild﹣developmentprogram.Ifeltsuccessful. Motherhood…whatagloriouscareerespeciallywhenthereisatitleonthedoor. 1Onhearingtheauthor'sansweratthetownhalltheclerkfelt. A.boredanddisappointed B.surprisedandcurious C.satisfiedandexcited D.interestedandrespectful 2Whatdoyouknowabouttheauthor'sfamily? A.Herdaughtersareallinvolvedinachild﹣developmentprogram. B.HerfamilyissupportedbyherworkasaResearchAssociate. C.Shehasfourdaughtersandtheyoungestissixmonthsold. D.Thereareatmostfivemembersinherfamily. 3Whatdoestheauthorthinkofherownjob? A.Excitingandprofitable. B.Satisfyingandsuccessful. C.Hardanddisappointing. D.Dullandmeaningless. 4Thetoneinwhichtheauthorwritesthetextis. A.indifferent B.cautious C.objective D.humorous
如下图所示的光现象中由于光的反射形成的是
某人因感染能引起流感的病毒而发烧住院治疗时医务人员为其测量体温发现该病人在24小时内的体温均在39℃左右波动．则该病人在这24小时内产热和散热的关系
为保证人身安全洗衣机电冰箱等电器都用三角插头使它们的外壳能够接地．下列哪种三角插头的设计更符合用电安全原则
WarleyWoodsCommunity社区Trust Welcometoourthirdnewsletteroftheyear! •OurmainactivityforMarchisourWalkfortheWoodsfundraisingeventsonSaturday17thMarchstartinganytimebetween10a.m.and2p.m.WewillbewalkingthedistancebetweenWarleyWoodsandTipperary.Itisindeedalongway﹣﹣﹣80miles.Themorepeoplethatyoucangetsponsoryouthemoremoneywecanraisetohelplookafterourbeautifulwoodland.Moreinformationisavailableatourwebsite. •TheSundayvolunteersplantedtwobeeches山毛榉andanoak橡树lastweek.ThiswasthankstothemoneyfromtheBigTreePlantandtoLisaandGordonWhitikerwhosefriendsgavemoneyforthebigtreesinsteadoffortheirweddingpresents.Thankstoeveryonewhotookpart. •Therewere15volunteersattheOralHistoryTrainingDaywhichwasledbyJuliaLetts.Thegroupwillbemeetingagainandwillstarttointerviewthelocalpeoplewhohaveofferedtotelltheirstories.WearehappytohearfromotherswhowouldliketobeinterviewedabouttheirmemoriesoftheWoodsfortheproject.IfyouoranyoneyouknowisinterestedpleasecallVivColeattheoffice.ThisprojectisfinancedbyHeritageLotteryFund. •TherewasahugeresponsetotheForestSchoolsactivitiesheldathalfterm.ThesewillbeheldagainduringtheEasterholidaysonthefollowingdates:4thAprilfrom10a.m.to3p.m.forover8s.On12thAprilfrom10a.m.to12noontherewillbeaTeddyBears'Picnicfortheunder8s.Allthesemustbebookedinadvance. •Finallydon'tforgettheEasterEggRollonBankHoliday9thAprilstartingat11a.m.Bringyourownhard﹣boiledanddecoratedeggtorolldownthehillinthewoods.Thefirstpastthefinishinglinewillwinalargechocolateegg!ThisyearduetopopulardemandtherewillalsobeanAdults'EasterEggRollfollowingthechildren'scompetition. •Welookforwardtoseeingyouallsoonatoneofourmanyevents. 1Whichofthefollowingwillbeon9thApril? A.WalkfortheWoods B.TeddyBears'Picnic C.TheEasterEggRoll D.TheOralHistoryTrainingDay 2HeritageLotteryFundprovidesmoneyto. A.helplookafterthewoodland B.collectstoriesaboutthecommunity C.holdactivitiesfortheForestSchools D.organizetheEasterholidaycompetition 3Thepassageiswrittento. A.informpeopleofthecomingevents B.encouragepeopletoworkasvolunteers C.invitepeopletotakepartinthecompetition D.tellpeopleaboutsomefamousorganizations 4Thepassageisprobablytakenfrom. A.anadvertisement B.amagazine C.acommunitybrochure D.anofficialreport
分解因式m2﹣4m+4＝．
清澈平静的湖面上空一只小燕子正向下俯冲捕食下列说法正确的是
Dashisasymbolwhichrepresentseverydaywe'vespentaliveonearth.Thereforehowyouspendyourdashisimportant. RecentlyI1aboutalittlegirlnamedHope.AfterlearningmoreaboutherlifeIcouldn'thelpbutfeelitwasnotbycoincidencenorhappenstance偶然事件2shehadbeennamedHope.Thestrongfeelingofsympathyandgenerosity3inheryoungheartmadealastingimpressiononmeandcountlessothers.4IneverhadtheopportunitytomeetherIwishIhad. Hopewasatwelve﹣year﹣oldgirlwhowas5awishinearlyDecember2010bytheMake﹣A﹣WishFoundationafterbeing6thatshehadararetypeofbonecancer.Howeverwhenshefoundoutthatmorethan1507inherareawerewaitingfortheirwishestobegranted实现sheunselfishlyusedherwishto8thatthosechildrenhavetheirwishesgranted.Shealsoaskedthatitbedone9January162011.Unfortunatelyhowevertheorganizationinformedherthather10requestcouldnotbegrantedasthefunds资金weresimply11.Theycalculatedthattheywouldneedtoraisemorethanone12dollarsinthirtydaysinordertograntherwish.13butnotdiscouragedsheturnedherdisappointmentintoanenthusiasmthatinspiredcaringindividualstotake14helpinggrantthewishesoftheotherchildrenandeventually15aswell.NewspapercolumnistsandreportersforradioandTVstations16thestoryofthiscaringyounggirlwhohad17theheartsofsomanyandaswordspreadthecommunitywaschallenged.Committeeswereformedandschoolscorporationsandvariousorganizationsassistedin18moneytohelpmakeHope'sdreamcometrue. Hereffortswerenotinvainastheycontinuetohelpothersnotonly19butspirituallyandemotionallyaswell.AtthegatheringtocelebrateherlifeACelebrationofHopeonJanuary162011the20wasmadethattheyhadindeedreceiveddonationstotalingmorethanonemilliondollars.Herwishhadbeengranted! 1A.heard B.thought C.cared D.talked 2A.which B.that C.how D.why 3A.lost B.lived C.expected D.housed 4A.Until B.Unless C.Though D.If 5A.expressed B.offered C.made D.sent 6A.recognized B.informed C.reminded D.diagnosed 7A.children B.citizens C.villagers D.relatives 8A.command B.ask C.arrange D.order 9A.for B.to C.on D.by 10A.final B.formal C.simple D.noble 11A.unbearable B.unbelievable C.unavailable D.uncomfortable 12A.thousand B.hundred C.million D.billion 13A.Disappointed B.Surprised C.Worried D.Embarrassed 14A.down B.up C.in D.over 15A.theirs B.ours C.hers D.yours 16A.heard B.read C.believed D.shared 17A.touched B.examined C.lost D.opened 18A.finding B.spending C.raising D.borrowing 19A.mentally B.physically C.healthily D.financially 20A.proposal B.decision C.conclusion D.announcement
某5W的吸顶灯由10只相同的LED小灯珠连接而成任意取下其中一只灯珠后其余灯珠仍能发光则10只小灯珠的连接方式是联每只小灯珠的额定电压为5V其正常工作时电流为A．
肥胖已经成为危害人们健康的严重问题中小学生的肥胖趋势更为明显经常参加体育锻炼有利于增强身体素质预防肥胖． 1下面是某初三同学为自己制定的体育锻炼目标其中符合实际的是 A．10秒钟跳绳跳60个B．立定跳远跳3米 C．1000米跑步用时4分钟D．掷实心球30米 2质量为50kg的同学在10秒内做了5个引体向上他引体向上一次重心上升的高度为40cm他做一次引体向上克服重力做功多少焦 310秒内该同学做功的功率为多少瓦 4可乐是很多青少年非常喜欢喝的饮料下表是某品牌可乐部分营养成分表该同学喝一听可乐体积335ml获得的能量和做多少个引体向上克服重力做功消耗的能量相当取整数 某品牌可乐部分营养成分表
某市为提倡居民节约用水自今年1月1日起调整居民用水价格．图中l1l2分别表示去年今年水费y元与用水量xm3之间的关系．小雨家去年用水量为150m3若今年用水量与去年相同水费将比去年多元．
摩擦起电是我们生活中常见的现象．当我们用自己的双手相互摩擦的时候下列关于两只手带电情况的说法中正确的是
小华同学利用一个弹珠三根材料和厚度相同长宽不同的橡皮条探究“橡皮条的弹性势能与长度宽度的关系”．他依次将橡皮条固定在弹弓上如图所示在弹性范围内拉伸相同的伸长量将弹珠在同一位置沿水平方向弹射出去测得弹射的水平距离数据如下表 请回答以下问题 1实验中是通过比较来间接反映橡皮条的弹性势能大小． 2比较第1次和第2次实验可知拉伸相同的伸长量橡皮条的弹性势能与橡皮条的有关． 3用同种材料同厚度的橡皮条拉伸相同的伸长量弹性势能最大的橡皮条是． A．窄而长的B．宽而长的C．窄而短的D．宽而短的
滑轮组不但可以省力而且可以改变力的方向那么使用滑轮组时拉力的大小究竟跟什么因素有关呢某科学兴趣小组同学开展了如下实验探究 实验步骤 1用弹簧测力计测出钩码和动滑轮的总重G． 2按如图甲所示的方式匀速拉动绳子记录此时承担重物和动滑轮总重的绳子股数和弹簧测力计读数F1． 3按如图乙所示的方式匀速拉动绳子记录此时承担重物和动滑轮总重的绳子股数和弹簧测力计的读数F2． 请回答下列问题 1表格中▲的内容是． 2该小组同学探究的是拉力大小跟因素是否有关． 3做甲实验前某同学将滑轮组按照图丙所示放置绕绳你认为是否可行并说出理由．
小柯是个善于观察的学生她注意到一个有趣的现象在无风的寒冷的冬天用吸管沿水平方向吹出的肥皂泡是先上升一段时间后才开始下降如图．而这种现象在火热的夏天不明显．请结合所学知识解释冬天吹肥皂泡时出现这种现象的原因．不计空气阻力
美国太空探索公司SpaceX试射的猎鹰重型运载火箭把一辆电动汽车送入绕太阳飞行的轨道下列关于该电动汽车说法正确的是
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.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. TheotherdayasIwalkedtoschoolIpassedsmallconstructionarea.Itwasnotfarawayinmyschool.Inoticeamanbringingabunchofthings:shoesblanketssomecannedfoodandclothing.Perhapstheitemsweregatheredfromhisfamilyandsomeofhisfriend.Hestartedlayingitdownforpeopletotake.CertainlyIwascuriousaboutwhatthingswouldbegoing.ButIrushedthereafterschool.Isawthatmuchoftheitemsweretakenbyothers.Ihavereadlotsofinspiredstoriesofkindness.ThisisprobablythesweetestactofkindnessI'vebeenwitnessedsofar.
为研究力的作用效果与哪些因素有关课堂上同学们做了如图甲乙所示实验该实验要研究的是力的作用效果跟力的有关．实验室图中A同学用50牛顿的力拉B同学手臂未能将B同学手臂拉起则B对A的拉力选填“大于”“小于”或“等于”50牛．
京沪高铁是世界上设计建设标准最高的高速铁路全长1318千米．京沪高铁“复兴号”于2017年9月21日正式提速京沪间全程运行需要4个半小时其牵引电机动力强劲功率为1×104千瓦． 1京沪高铁“复兴号”全程运行一次平均速度多少千米/小时计算结果保留小数点后一位 2“复兴号”以1×104千瓦的功率运行10分钟需要消耗多少焦的电能 3如图所示为两种不同型号的火车头你认为哪一种火车头更适合做“复兴号”火车头并说出你的科学依据．
如图1抛物线Cy＝ax2+bx经过点A﹣40B﹣13两点G是其顶点将抛物线C绕点O旋转180°得到新的抛物线C′． 1求抛物线C的函数解析式及顶点G的坐标 2如图2直线ly＝kx﹣经过点AD是抛物线C上的一点设D点的横坐标为mm＜﹣2连接DO并延长交抛物线C′于点E交直线l于点M若DE＝2EM求m的值 3如图3在2的条件下连接AGAB在直线DE下方的抛物线C上是否存在点P使得∠DEP＝∠GAB若存在求出点P的横坐标若不存在请说明理由．
某数学社团开展实践性研究在大明湖南门A测得历下亭C在北偏东37°方向继续向北走105m后到达游船码头B测得历下亭C在游船码头B的北编东53°方向．请计算一下南门A与历下亭C之间的距离约为参考数据tan37°≈tan53°≈
如图ABCD是⊙O的两条直径过点C的⊙O的切线交AB的延长线于点E连接ACBD． 1求证∠ABD＝∠CAB 2若B是OE的中点AC＝12求⊙O的半径．
“共享汽车”服务逐渐进入一些城市．某城市所用的“共享汽车”整车质量为1000kg额定输出功率为12kW设该车行驶过程中受到的阻力是车重的0.05倍．请问 1该车静止在水平地面上轮胎与地面的接触总面积为0.04m2时则空车时该车对地面的压强是多大 2若该车载人后总质量为1200kg该车以额定输出功率在平直公路上匀速行驶时速度是多大 3小金家距学校大约7200m小金爸爸开该车送小金去学校路上用时10min该路段限速40km/h请计算说明小金爸爸是否驾车超速
一个n边形的内角和等于720°则n＝．
下列各图所列举的事例中属于热传递改变物体内能的是
如图在▱ABCD中EF分别是AD和BC上的点∠DAF＝∠BCE．求证BF＝DE．
计算﹣1+π+10﹣2cos60°+
漂浮在水面上的潜水艇从水面向下匀速潜航过程中下列关于它所受到的海水浮力和自身重力的变化情况的分析正确的是
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