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如图①，在矩形ABCD中，AB＜AD，对角线AC，BD相交于点O，动点P由点A出发，沿AB→BC→CD向点D运动．设点P的运动路程为x，△AOP的面积为y，y与x的函数关系图象如图②所示，则AD边的...
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四边形ABCD的对角线AC.BD相交于点O.AD//BCAD=BC使四边形ABCD为正方形下列条件中
①②
②③
②④
①②或①④
如图在矩形ABCD中对角线ACBD相交于点O.点E.F分别是AOAD的中点若AB=6cmBC=8cm
在矩形ABCD中对角线ACBD相交于点O.若∠AOB=60°AC=10则AB=.
在平行四边形ABCD中对角线AC和BD相交于点O.则下面条件能判定平行四边形ABCD是矩形的是
AC⊥BD
AC=BD
AC=BD且AC⊥BD
AB=AD
如图在矩形ABCD中对角线ACBD相交于点O.∠AOB=60°AC=6cm则AB的长是
3cm
6cm
10cm
12cm
如图在矩形ABCD中AB=3对角线ACBD相交于点O.AE垂直平分OB于点E.则AD的长为_____
如图在矩形ABCD中对角线ACBD相交于点O.AB＝4∠AOD＝120°求AC的长.
如图在矩形ABCD中对角线ACBD相交于点O.点E.F.分别是AOAD的中点.若AB＝6cmBC＝8
矩形ABCD中对角线ACBD相交于O.∠AOB＝60°AC＝10cm则AB＝______cmBC＝_
如图在矩形ABCD中AB=3对角线ACBD相交于点O.AE垂直平分OB于点E.则AD的长为_____
如图在周长为20cm的平行四边形ABCD中AB≠AD对角线ACBD相交于点O.OE⊥BD交AD于E.
矩形ABCD中对角线ACBD相交于点O.∠AOB=60°若BD=4cm则AD=.
如图在矩形ABCD中对角线ACBD相交于点O..若∠AOB＝60°AB＝4cm则AC＝______c
如图矩形ABCD的对角线ACBD相交于点O.分别过点C.D.作BDAC的平行线相交于点E.若AD=6
有一个矩形ABCD则下列不一定正确的是
AD∥BC
AB＝CD
对角线AC与BD互相平分
对角线 AC⊥BD
如图二所示□ABCD中对角线ACBD相交于点O.且AB≠AD则下列式子不正确的是
AC⊥BD
AB＝CD
BO=OD
∠BAD=∠BCD
如图8在矩形ABCD中对角线ACBD相交于点O.若∠AOB=60°AB=4cm则AC的长为__cm.
如图在矩形ABCD中对角线AC与BD相交于点O.且AB＝OA＝2cm则AD的长为________.
在矩形ABCD中对角线ACBD相交于点O.∠BOC=120°AB=5则BD的长为
如图矩形ABCD中AB=3BC=4对角线AC和BD相交于点0过0作OE⊥AC交AD于E则AE=
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InFlorida.agroupofparentsknownas'thebreakmoms'hasbeenfightingtopassalawguaranteeingthestate'selementary﹣schoolstudentsatleast20minutesofdailyfreeplay.Inasurveyofschool﹣districtadministratorsroughlyathirdsaidtheirdistrictshadreducedoutdoorplayintheearly2000s.Disadvantagedkidshavebeenthemostlikelytobeshortchanged克扣.Accordingtoa2003studyjust56percentofchildrenlivingatorbelowthepovertylinehadbreakcomparedwith83percentofthoseabovethepovertylineasimilardisparity差异existedbetweenblackchildrenandtheirwhitepeers.Thebenefitsofbreakmightseemobvious﹣timetorunaroundhelpskidsstayfit.Butalargebodyofresearchsuggeststhatitalsopromotescognition认知.Manystudieshavefoundthatregularexerciseimprovesmentalfunctionandacademicperformance.Andananalysisofstudiesthatfocusedspecificallyonbreakfoundpositiveassociationsbetweenphysicalactivityandtheabilitytoconcentrateinclass.Inoneseriesofexperiments.researcherscontrolledbreakstarttimes.Somedayschildrenwereletoutat10am.andotherdaysat1030.Thekidsattentivenessdecreasedwhentheyhadtowaitlongerforbreakandrefreshedthemselvesaftertheyplayed.Andwhenfourth﹣gradersinabreak﹣freeschoolweregivenaweeklybreak.Anothergroupofresearchersfoundthattheyhadaneasiertimestayingontaskandweremuchlessrestless.Theseexperimentalfindingsaresupportedbyananalysisof10000questionnairesfilledoutbythird﹣gradeteachersEvenasingle15﹣minutedailybreakwasconnectedwithmore﹣positiveratingsofclassroombehavior.Perhapsmostimportantbreakallowschildrentodesigntheirowngames.totesttheirabilitiestorole﹣playandtosettletheirownconflicts﹣activitiesthatarekeytodevelopingsocialskillsandmanagingcomplicatedsituations.InitialresultsfromanongoingstudyinTexassuggestthatelementary﹣schoolchildrenwhoaregivenfour15﹣minutebreaksadayaresignificantlymoresympathetictowardtheirpeersthanarekidswhodontgetbreak.1Whatcauses'thebreakmoms'tostartafight?A.Pupilslackofoutdoorplay.B.Poorschoolmanagement.C.Absenceofeducationlaws.D.Inequalityamongstudents.2Inoneseriesofexperimentsresearchersfindthat.A.childrenbehavebetterwhenletoutearlierB.kidswaitinglongerareunabletostayfocusedagainC.third﹣gradershavedifficultyinfocusingontaskD.fourth﹣gradersaremoreconcentratedwithoutabreak3Whatcanweinferifwecanensurechildrenacertainamountofdailybreak?A.TheyescapefromlifeconflictsB.TheymaystrengthendependenceC.TheyaremoreconsideratetowardsothersD.Theyareeagertomanagecomplicatedsituations.
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Theaccidentwhichleft15peopleonboarddeadifboththeangryfemalepassengerandthebusdriverhadkeptcalm. A.shouldhaveavoided B.shouldbeavoided C.couldhaveavoided D.couldhavebeenavoided
紫水晶在西方国家代表着“爱的守护石”其主要成分SiO2属于
Ifyouarenotreadingthisonascreenthenyouholdinyourhandsoneofhumanity'sworld﹣changinginventions.Yetthatpowerhasnotbeenmatchedbyfamepaperdelightsinself﹣modestypointingyoutothewordsonitssurfaceandsoactingonlyasastageforideasandargumentsthathavechangedhistory.Withoutthatstagethewrittenandprintedwordwouldhaveattractedonlyasmallaudience.Allthealternativestopapercommonlyusedthroughoutourpre﹣digitalhistoryhavebeentooraretooheavytooexpensiveortooinconvenienttodeliverwordstoawidenumberofpeopleletaloneamassreadershipPaperhasenabledwriterstoreachunprecedented前所未有numbersthroughouthistory.AmongthemweretheBuddhistmissionarytranslatorsfromSouthandCentralAsiawhobroughttheirreligiontoChinaalmosttwothousandyearsago.ThepaperagehasitsoutstandingpersonalitiesLevNikolayevichTolstoyandJohannWolfgangvonGoethewhosecollectedworkswhencombinedfillmorethan200volumes.Formanyofusithasonlybeentheriseofdigitalmediathathasfinallyopenedoureyestopapersstrikingexistenceeverywhere.Ofcoursepaperhasfoundthousandsofrolesforitselfwritingaside.Yourbedsidelampglowsthroughapapercoverandthecupsintheofficecoffeemachinearemadefrompaper.Itcanbeascommonandpracticalasabusticketoritcanbetreasuredandexpensiveasthecarrieroftheworldsbest﹣lovedpainting.Itisclearthatmanypredictionsofpaper'sextinctionhavebeenpremature﹣andgreatlyoverstated.Muchofthe400milliontonsofpaperproducedannuallyisabsolutelynecessarytoourwayoflife.Thebiggerquestionofcourseconcernstheonerolepaperhashadthathasbeentransformativefortheworld.namelyasthecarrierofwrittenorprintedtext.Alreadyitisleavingmuchofthedifficultworkofwordstodigitalmediaandmanyofitscenturies﹣oldroleshavealreadybeenlargelytransferredtothescreen.Thereisalsoasenseinwhichpaperhasitselfbecomeasubjectratherthansimplyamedium.Thisbegantobecomeclearinartseveraldecadesago.aspaperbecamenotsimplythebackdrop背景forartbutinafewcasesthestuffoftheartitself.Thisdoesn'tmeanthatpapersusesasavehicleforwordswillendbutitdoessignalaslowingdown.Morethanthatitsignalsthatpaper'sgreatestvirtuesarenolongergoodenough.Thosevirtuesenabledunprecedentedperiodsofculturalexpansiveness.justastheyencouragedknowledgebeliefsandideastomovefurtherdownthesocio﹣cconomicladder.Yetsuchtransformativequalitiesaresharedbypaper'sdigitalopponent对手andpapercannolongercompeteonspeedofdeliveryscaleofinformationimmediatelyavailableoreaseofaccess.Paper'shistoricdynamism活力hasreceiveditsfirstgreatchallengeandinmanyaspectsitappearstobelosingNostalgia怀旧simplydismissespapertoamuseumpiece.Buttherearereasonstothinkthatthedynamismthatpaperhasexhibitedoversome20centurieswillnotbetransferredtotallytodigitalmedia.Thereareafewpracticalreasons.Electricpowerisalwaysneededfordigitalmediaofcourse.Moreimportantlyanythingonlinecanpotentiallybehackedinto.Yourownreadingchoicescanbeviewedfromtheothersideoftheworld.Evenwhatyouwritecanbeviewedandchangedordeleted.Butitistheownershipofknowledgethatmattersmost.AsAmazonrecentlyremindedakindlereaderwhohadlostthetextofabookhewasreading.youdonot'own'yourbooksonKindleasyouownaphysicalbook.Yousimplyhavetherighttoaccessthem.Thedigitalrevolutioncertainlyprovidesunprecedentedaccesstoknowledge.Butitisaccessonly.Textthatyoucanholdshelveandownduetopaperwillalwayshaveamagicallitsown.1Whydoespapernothavewell﹣deservedfame?A.Muchinformationisavailableonascreen.B.Ittakesgreatdelightinbeingmodest.C.Onlyasmallcrowdenjoysthebenefitsofit.D.Italwaysguidesreaderstofocusmoreonitself.2TheunderlinedpartinParagraph4impliesthatthedigitalmedia.A.ignorestheexistenceofpaperB.promotesthewideuseofpaperC.replacesthefunctionsofpaperD.helpsusrealizetherolesofpaper3Onereasonwhypaperwon'tcometoanendisthat.A.itisbeingmass﹣producedB.itismorethanamediumC.ithasacenturies﹣oldroleD.itisawell﹣knowninvention4What'sthepurposeofmentioningthebestvirtuesofpaperinParagraph6?A.Toshowitsfastdevelopment.B.Toproveitsunchangedstrength.C.Toindicateitslossofcompetitiveness.D.Tobringbackitspastbrilliance.5Whatisthebiggestproblemthedigitalmediaface?A.Itdependsonelectricpower.B.Personalprivacyiseasytoleak.C.Usersonlyhavetherighttouse.D.Thejoyofreadingishardtofeel.6Whatisthebesttitleforthepassage?A.TheHistoryofPaperB.ThePowerofPaperC.TheDevelopmentofPaperD.TheApplicationofPaper
短周期主族元素XYZW的原子序数依次增大X是原子半径最小的原子Y原子最外层电子数是其内层电子总数的3倍W原子的核电荷数等于XZ原子核电荷数之和X和Z同主族．下列说法正确的是
下列过程吸收热量的是
请阅读下面图画和文字并按照要求用英语写一篇150词左右的文章. 【写作内容】 1.上面图文信息中的Mati的情况实际上反映了一种社会现象请以约30词阐述这种现象的主要内容 2.你认为人们该以什么样的态度来对待这种社会现象?是将它当做一种社会问题加以干涉还是当做一种正常现象给予理解?请给出理由论证你的观点至少三点 【写作要求】 1.写作过程中不能直接引用原文语句 2.作文中不能出现真实姓名和学校名称 3.不必写标题 【评分标准】 内容完整语言规范语篇连贯词数适当.
下列有关物质用途的说法正确的是
已知反应2CO2+6H2CH2═CH2+4H2O可用于合成烯烃．下列有关该反应的说法错误的是
请阅读下面短文并按照要求用英语写一篇150词左右的文章.TheUniversityofCambridgeconfirmedthatitwouldacceptstudentsbasedonGaokaotestresultsinapostontheUniversity'sofficialWeiboaccountonMarch25.TheGaokaoChina'sextremelydifficultuniversityentranceexamisnowacceptedbyanumberofoverseasuniversitiesincludingtheUniversityofNewHampshirewhichlastyearbecamethefirststateuniversityintheUStoacceptGaokaoscoresfornewadmissionstheUniversityofWesternAustraliaandtheUniversityofBritishColumbiainCanada.PreviouslyChinesestudentswouldhavetotakestandardizedcollegeadmissiontestssuchastheSATandACTusedinUSschools.TheGaokaoisregardedassuitablepreparationforCambridge.TheGaokaoscoresofsuccessfulapplicantswillvaryfromprovincetoprovinceandyeartoyear.Asaguidelinesuccessfulapplicantswillusuallyhavescoresinthetop0.1%ofthosetakingtheGaokaointheirprovince.InadditiontothetotalscoreCambridgeCollegeswillpaycloseattentiontoindividualsubjectscoresandscoresintheSeniorHighSchoolExaminationsXueyeShuipingKaoshipreviouslytheHuikao.TheXueyeShuipingKaoshialonearenotregardedassuitablepreparationforCambridge.【写作内容】1.用约30词写出上文概要2.你对高考被国外著名大学认可的看法并至少从两个方面解释你的观点3.谈谈你对如何提高高考国际认可度的建议不少于2条.【写作要求】1.写作过程中不能直接引用原文语句2.作文中不能出现真实姓名和学校名称3.不必写标题.【评分标准】内容完整语言规范语篇连贯词数适当.
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