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如图所示，已知点A（1，1），单位圆上半部分上的点B满足＝0，则向量的坐标为 ．
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高一下学期数学《》真题及答案
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梁的截面形状如图示圆截面上半部分有一圆孔在xOz平面内作用有正弯矩M绝对值最大的正应力位置在图上的
a点
b点
c点
d点
如图K40－3所示与直导线ab共面的轻质闭合金属圆环竖直放置两点彼此绝缘环心位于ab的上方.当ab中
向下平动
向上平动
上半部向纸内、下半部向纸外转动
下半部向纸内、上半部向纸外转动
图K40－3
线性的需求曲线的上半部分的需求价格弹性绝对值总是大于1
如图1AB是⊙O.的直径点C.在AB的延长线上AB=4BC=2P.是⊙O.上半部分的一个动点连接OP
梁的截面形状如图示圆截面上半部分有一圆孔在xOz平面内作用有正弯矩M绝对值最大的正应力位置在图上的
a点
b点
c点
d点
梁的截面形状如图示圆截面上半部分有一圆孔在xOz平面内作用有正弯矩M绝对值最大的正应力位置在图上的
a点
b点
c点
d点
如果需求曲线是向右下方倾斜的直线那么需求价格弹性是
上半部分缺乏弹性，而下半部分为富有弹性
全部缺乏弹性
上半部分富有弹性，而下半部分为缺乏弹性
全部富有弹性。
如图已知点和单位圆上半部分上的动点.⑴若求向量⑵求的最大值.
一个物体通过凸透镜成像于屏上若将透镜的上半部分遮住则下列说法中正确的是
屏上的像只有下半部分
屏上的像变暗，位置不变
屏上的像上半部分变暗，下半部分保持原来的亮度
屏上的像变得模糊不清
往复式天然气压缩机气缸上部注油点担负着对活塞环上半部分及气缸顶壁的作用
如图1AB是圆O.的直径点C.在AB的延长线上AB=4BC=2P.是圆O.上半部分的一个动点连接OP
利润表上半部分反映经营活动下半部分反映非经营活动其分界点是
净利润
营业利润
利润总额
主营业务利润
如图所示是一颗子弹一瞬间将水珠击穿时的情景这一过程的瞬间水珠的上半部分由于_________仍保持原
如图所示凸透镜的下半部分被截去其上半部分的高度为L..在其左焦点F.处放有高为L.的发光物AB在右焦
成一个正立等大的虚像和一个正立放大的虚像
成一个正立等大的虚像和一个倒立缩小的实像
AB的上半部分成一个等大倒立的实像，下半部分不成像
AB的下半部分成一个等大倒立的实像，上半部分不成像
如图1AB是圆O.的直径点C.在AB的延长线上AB=4BC=2P.是圆O.上半部分的一个动点连接OP
如图所示在一个凸透镜的主光轴上距光心2倍焦距的地方放一点光源S在透镜的另一侧距光心3倍焦距的地方垂
屏上亮圆斑上半部消失
屏上亮圆斑下半部消失
屏上亮圆斑仍完整，但亮度减弱
屏上亮圆斑直径减小
利润表上半部分反映经营活动下半部分反映非经营活动其分界点是
营业利润
利润总额
主营业务利润
净利润
如图1AB是⊙O的直径点C.在AB的延长线上AB=4BC=2P.是⊙O上半部分的一个动点连接OPCP
烛焰经过凸透镜在光屏上成一清晰的像若用硬纸片盖住凸透镜的上半部分则光屏上的像将
只剩下半部分；
完全消失；
只剩上半部分；
仍然完整
如图所示MN是一条水平放置的固定长直导线通电电流大小为I1方向向左P.是一个通有电流I2的与MN共面
沿纸面向上
沿纸面向下
上半部分垂直纸面向外，下半部分垂直纸面向里
上半部分垂直纸面向里，下半部分垂直纸面向外
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BillboardMusicAwardsoftheYear2015goestoTaylorSwiftasinger﹣songwriterwhohasshapedandinspiredtheAmericanmusicindustrywithhersuccess. WhenTaylorSwiftfirstcametopublicnoticeshewasa17﹣year﹣oldnewcomerwholovedsingingtoherownguitar.Shewasfarmoreenthusiasticthanskilledbutapparentlythrewsparkofsuperbtalent. FouryearslaterSwifthasbecomeamulti﹣awardswinnerwiththebiggestsellingalbums.ForherconsummateperformanceTaylorSwiftwasnamedBillboardmagazine'swomanin2011.SheistheyoungestartisttoreceivehonorsandseveralBillboardMusicAwardsamongthemTopCountryAlbumforthefive﹣timeplatinum白金sellingSpeakNowherthirdalbumthatwasreleasedthatyear. Taylorhasshownthepowerofgoodsongwritingwithmusicofstyles.saidBillWerdeBillboard'seditorialdirectorAndatsuchayoungageTaylorhasalreadymadeamajorimpactonmusicandhasbeenanunbelievablerolemodelforpromisingartistsandyoungwomaneverywhere. Swiftisusedtobreakingchartrecordsandwinninghonorssincehercareerstarted.Shefollowedthatupin2008withFearlesswhichestablishedherasaskilledsongwriterwithseveralhitsincludingLoveStoryYouBelongWithMeandWhiteHorse. Notsurprisinglythe6﹣timeplatinumFearlessisthemostawardedalbumincountrymusichistoryintheUSandheroverallworldwidesalesnowreach20millionalbumsand40millionsongsdownloads.SwifthasspentthepastyearontheSpeakNowWorldTourinsupportofherthirdalbumandnowshe'sgettingreadytogofurther. AccordingtoarecentinterviewwithTheNewYorkermagazineSwifthassofarwrittenabout10songsfora2016album.Shesaidthenewalbumisaboutfeelingsofgrowingupandbecominganadult. They'resadifI'mbeinghonest.SwifttoldTheNewYorker.They'reaboutmyheartbreaksandmymovingon.Butmoreimportantlytheyareaboutachievingcontentment.You'renotalwaysgoingtoberidiculouslyhappyasyougrowup. 1AsanewcomerintheshowbusinessTaylorSwiftwasconsideredtobe. A.askilledsongwriter B.anoutstandingartist C.anenergeticdirector D.apromisingtalent 2TheunderlinedwordconsummateinParagraph3canbestbereplacedby. A.confident B.professional C.excellent D.different 3Whatcanwelearnfromthepassage? A.SpeakNowisTaylorSwift'sthirdalbum. B.FearlessmarkedthebeginningofSwift'scareer. C.Swift'snewalbumisaboutfeelingsofgrown﹣ups. D.SwifthasgainedBillboardmagazine'swomantwice. 4Thispassageismainlyabout. A.ARisingMusicGenius B.Taylor'sHeartbreaksinGrowth C.AnInterviewwithTaylorSwift D.BillboardMusicAwardsinAmerica
修建隧道可以方便出行．如图AB两地被大山阻隔由A地到B地需要爬坡到山顶C地再下坡到B地．若打通穿山隧道建成直达AB两地的公路可以缩短从A地到B地的路程．已知从A到C坡面的坡度i＝1从B到C坡面的坡角∠CBA＝45°BC＝4公里．1求隧道打通后从A到B的总路程是多少公里结果保留根号2求隧道打通后与打通前相比从A地到B地的路程约缩短多少公里结果精确到0.01≈1.414≈1.732
某校高一年级今年计划招四个班的新生并采取随机摇号的方法分班小明和小红既是该校的高一新生又是好朋友那么小明和小红分在同一个班的机会是
TheInternationalVoluntaryServicerunsnumberofYouthExchangesthroughouttheyear.YouthExchangesgivesmallgroupsof4﹣5youngpeopletheopportunitytotakepartinvolunteeringtripsabroadforanaverageoftwoweeks.Theseyoungpeopletheopportunitytotakepartinvolunteeringtripsabroadforanaverageoftwoweeks.Theseyoungpeoplearejoinedby4﹣5youngpeoplefrom3﹣4othernationalitiesandareawonderfulinterculturalexperienceinasafeenvironment. ExampleYouthExchanges YouthExchange1 LocationIreland OthernationalitiesIrelandSpainItalyHungary ThemeFocusesonthetopicofcommunityreconstructionandcommunityactivities﹣﹣﹣exploringhowlocalissuesfacingoutcommunitiesareconnectedtoglobalissues.Thegroupwillalsolearnabouttheeco﹣villageasanexampleofacommunityandtakepartinteam﹣buildingactivities. YouthExchange2 LocationFrance OthernationalitiesBulgariaItalyFrance ThemeOrganicgardening&continualliving.ThisprojectwilltakeplaceinanaturalparkWherethegroupwilltakepartingardeningactivitiesandgames/workshopsaboutcontinuousdevelopment. YouthExchanges3 LocationMacedonia OthernationalitiesSerbiaTurkeyIreland ThemeFoster培育socialinclusionandmotivatepersonaldevelopmentofyoungpeoplethroughsportandoutdooractivities.Promoteoutdooractivitiesasatooltohelpinclusionofyoungpeoplewithfeweropportunities. YouthExchange4 LocationItaly OthernationalitiesItalyBulgariaGreece ThemeAsocial﹣environmentalprojectthatintendstopromotesocialinclusionandcontinuousdevelopmentregardedasaprocessofcivilrightsandactivecitizenship.Over10daysthegroupwillparticipateinactivitiestoraiseawarenessabouttheeffectofourbehaviorontheenvironment. 1WhatdoyoufocusonwhentravellinginFrance? A.Gardeningwork B.Civilrights. C.Developingsocialinclusion. D.Rebuildingcommunities. 2Ifyouareinterestedinprotectingtheenvironmentyoucantakepartin. A.YouthExchange1 B.YouthExchange2 C.YouthExchange3 D.YouthExchange4 3WhichnationalityareYouthExchangesmostpopularwith? A.Spain. B.Italy. C.Ireland. D.France.
在环保督察中为落实“垃圾分类”环卫部门要求垃圾要按红黄绿三类分别装袋红类指废电池过期药品等有毒垃圾黄类指剩余食品的厨余垃圾绿类指塑料废纸等可回收垃圾小丽投放了一袋垃圾小芳投放了两袋垃圾这两袋垃圾不同类 1小丽投放的一袋垃圾恰好是红类的概率是 2求小芳投放的垃圾恰好有一袋与小丽投放的垃圾是同类的概率．
下列赋予4m实际意义的叙述中不正确的是
比1小3的数是
InChinathehistoryofpeopleplantingandusingbamboocandatebacktoasfaras7000years.AsearlyastheShangDynastybamboowasbeingusedinancientpeople'sdailylives.Itwasusedforfoodclothinghousingtransportation1musicinstrumentsandevenweapons. The2applyofbambooinscienceandtechnologyisthrilling.In251BCLiBinginSichuan3leadthelocalpeopleinbuildingtheDujiangWeirs都江堰thefirstirrigationnetworkintheworldinwhichbambooplayed4importantrole.Theworld'soldestwaterpipewasalso5makeofbamboo.DuringtheHanDynastythepeopleinSichuan6successsanka1600﹣metre﹣deepwellwiththickbambooropes.ThistechnologydidnotspreadtoEurope7the19thcenturyanditwasbyusingthetechnology8theAmericansdrilledthefirstoilwellinPennsylvaniain1859. InChineseculturebambooiswell﹣knownas9ofthefourgentlemeninplants.Tomanyfamousmenbambooisasymbolofgoodnessandhonesty.Itisalwayscloselyrelatedtopeopleofpositivespirits.Bambooculturecontributestoencouragingpeopletoholdonwhen10facetoughsituations.
Myfatherwasalwaysagoodgardener.Oneofmyearliestmemoriesisstandingwithoutshoesinthefreshlytilled翻耕的soilmyhandsblackenedfromdiggingintheground. AsachildIlovedfollowingDadaroundinthegardenIrememberDadpushingthetiller耕作机aheadinperfectlystraightlines.Dadlovedgrowingallsortsofthingsyellowandgreenonionswatermelonsalmostasbigasmerowsofyellowcomandourfavorite﹣redtomatoes. AsIgrewintoateenagerIdidn'tgetsoexcitedaboutgardeningwithDad.Insteadofmagicallandofpossibilityithadturnedintosomekindofprison.AsDadgrewolderhisloveforgardeningneverdisappeared.AfterallthekidsweregrownandhadstartedfamiliesoftheirownDadturnedtogardeninglikeneverbefore.Evenwhenhewasdiagnosedwithcancerhestilltookcareofhisgarden. Butthenthecancerbitbybitinvadedhisbody.Ihadtodothethingsheusedtodo.WhatreallyconvincedmethatDadwasdyingwasthestateofhisgardenthatyear.Therowsandrowsofmulticoloredvegetablesweregone.Tootiredtoweedthemhesimplyletthembe.Heonlyplantedtomatoes. ForthefirstfewyearsafterhediedIcouldn'tevenbeartolookatanyone'sgardenwithouthavingstrongmemoriespourovermelikecoldwaterfromabucket.ThreeyearsagoIdecidedtoplantmyowngardenandstartedoutwithjustafewtomatoes.ThatmorningafterbreakingupafairamountofsoilsomethingcaughtthecomerofmyeyeandIhadtosmile.Itwasmyeight﹣year﹣oldsonNathanhappilyplayinginthefreshlytilledsoil. 1Whydidtheauthorlikethegardenwhenhewasachild? A.Thegardenwasplantedwithcolorfulflowers. B.Thegardenwasjustfreshlytilledbyhisfather. C.Helovedwhathisfathergrewinthegarden. D.Heenjoyedbeinginthegardenwithhisfather. 2Whenallthekidsstartedtheirownfamiliestheauthor'sfather. A.devotedmoretogardening B.turnedtootherhobbies C.stoppedhisgardening D.focusedonplantingtomatoes 3Whathappenedtothegardenwhentheauthor'sfatherwasseriouslyill? A.Theauthor'ssontookchargeofit. B.Noplantgrewinthegardenatall. C.Thegardenwasalmostdeserted. D.Itbroughttheauthoragreatharvest. 4Wecaninferfromthelastparagraphthat. A.theauthor'ssonplayedhappilyinthegarden B.theauthor'ssonremindedhimofhisownfather C.theauthor'ssonwasverygladtohelptheauthor D.theauthor'ssonwillcontinuegardeningaswell
如图所示一动点从半径为2的⊙O上的A0点出发沿着射线A0O方向运动到⊙O上的点A1处再向左沿着与射线A1O夹角为60°的方向运动到⊙O上的点A2处接着又从A2点出发沿着射线A2O方向运动到⊙O上的点A3处再向左沿着与射线A3O夹角为60°的方向运动到⊙O上的点A4处A4A0间的距离是…按此规律运动到点A2019处则点A2019与点A0间的距离是．
如图1菱形ABCD中∠ABC＝120°P是对角线BD上的一点点E在AD的延长线上且PA＝PEPE交CD于F连接CE． 1证明△ADP≌△CDP 2判断△CEP的形状并说明理由 3如图2把菱形ABCD改为正方形ABCD其他条件不变直接写出线段AP与线段CE的数量关系．
若实数5是不等式2x﹣3a＜1的一个解则a可取的最小正整数为
若分式的值为0则x的值是．
已知则A＝
某商店有方形圆形两种巧克力小明如果购买3块方形和5块圆形巧克力他带的钱会差8元如果购买5块方形和3块圆形巧克力他带的钱会剩下8元．若他只购买8块方形巧克力则他会剩下元．
如图1在等边△ABC中点D是BC边的中点点P为AB边上的一个动点设AP＝x图1中线段DP的长为y若表示y与x的函数关系的图象如图2所示则等边△ABC的面积为
小辉根据学习函数的经验对函数y＝|x﹣1|的图象与性质进行了探究下面是小辉的探究过程请补充完整 1列表找出y与x的几组对应值． 其中b＝在平面直角坐标系中画出该函数的图象 2写出该函数的一条性质．
如图正方形ABCD的边长为8M是AB的中点P是BC边上的动点连结PM以点P为圆心PM长为半径作⊙P． 1当BP＝时△MBP～△DCP 2当⊙P与正方形ABCD的边相切时求BP的长 3设⊙P的半径为x请直接写出正方形ABCD中恰好有两个顶点在圆内的x的取值范围．
小英解不等式的过程如下请指出她解答过程中错误步骤的序号并写出正确的解答过程． 解去分母得31+x﹣22x+1≤1①去括号得3+3x﹣4x+1≤1② 移项得3x﹣4x≤1﹣3﹣1③合并同类项得﹣x≤﹣3④ 两边都除以﹣1得x≤3⑤
如图将边长为3a的正方形沿虚线剪成两个正方形和两个长方形．若去掉边长为2b的小正方形后再将剩余部分拼成一个矩形则矩形的周长为
HowSuperAreSupermarkets? Buyingeweek'sgroceriesistiring.Youwanttogetitoveranddonewithquicklysoyouheadforthenearestsupermarketyoufindeverythingyouneedunderoneroofandyoufeelgladthatthosedaysofgoinginandoutofdifferentshopsinthehighstreetareover.Supermarketsseemtobeabigplus.Thereisadownsidethough. IntheUK90%ofallthefoodpeopleconsumeisboughtat5differentsupermarketchains.Thismakesthesecompaniesextremelypowerfulwhichletsthemusetheirhugebuyingpowertosqueezesmallsupplierstogetthebestdeal.Milkisagoodexample.Supermarketsliketousethingslikemilkwhichisthetopofalmosteveryone'sshoppinglisttoattractcustomers.Toofferthelowestpricepossibletotheconsumerthesupermarketsforcedairyfarmerstosellmilkatlessthanthecostofproduction.Supermarketsguaranteetheirgoodprofitswhilefarmersareleftstrugglingtomakeendsmeetandthetaxpayerpaystosupportthesystemwithoutevenknowingit. Itwouldbeniceiflocalgrocerssupportedlocalagriculture.Butforthebigsupermarketsthisjustdoesn'tmakesense.Supermarketsdon'twantlittlefarmersthinkingtheycandecideprices.Sosupermarketshavestartedaglobalsearchforthecheapestpossibleagriculturalproduce.Inmanysupermarketsitisdifficulttofindanythingwhichisproducedlocally. UKfarmersusedtogrowalotofapples.Notanymore.In199936%ofappleswereimported.By2015thefigurehadrisento80%andthedomesticproductionofappleshadfallenbytwothirds.TheconsumermightjustbehappytogetareasonablypricedmealmadeupoffoodsfromThailandSpainItalyandZambiabutweshouldalsobearinmindtheInfluenceonlocalproducers. Thenthere'spackaging.Supermarketslikeeverythingtobepackedandwrappedsoitcanbepiledneatlyonshelves.Supermarketsproducenearly10milliontonsofwastepackagingintheUKeveryyearofwhichless5%isrecycled.Somesupermarketsmakesurethatlargerecyclingbinsareobviousintheircarparksshowingthattheyareenvironment﹣friendly.Butthatisjustanimage. Whenanewsupermarketisplannedthereareclaimsaboutthenumberofnewjobsthatwillbecreated.Unfortunatelythenumberofjobslostintheareaislargerthanthenumberofnewpositionsinthesupermarket.Onaverageeachnewsupermarketleadstothelossof276jobs. Howeverthemodernworldisallaboutshoppingandthefreedomtobuywhateveryouwhatsoitwouldbeimpossibletostoppeopleshoppingatsomeparticularkindofshop.Butsomemeasuresdoneedtobetakenwhensmallsuppliersloseprofitslocalproducerssuffersealevelsriseandjobsarelostanywaywecan'tjustcareaboutafreecarparkandspecialoffers. 1Theauthormentionsmilkinparagraph2toexplainhowsupermarkets. A.cheatthetaxpayers B.supportlocaldairyfarmer C.harmsmallsuppliers‘benefits D.providecustomerswiththecheapestproduct 2Accordingtothepassagesupermarketskeeppriceadvantageby. A.competingagainsteachother B.importingforeignproducts C.purchasinglocalproducts D.reducingproducttax 3Whichofthefollowingshowsthestructureofthepassage? CPCentralPointPPointSPSub﹣pointCConclusion 4Whatistheauthor'sattitudetowardssupermarkets? A.Critical B.Sympathetic C.Doubtful D.Cautious
近似数5.10精确到
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比较大小32．
如图1在平面直角坐标系xOy中已知点A和点B的坐标分别为A﹣20B0﹣6将Rt△AOB绕点O按顺时针方向分别旋转90°180°得到Rt△A1OCRt△EOF．抛物线C1经过点CAB抛物线C2经过点CEF． 1点C的坐标为点E的坐标为抛物线C1的解析式为．抛物线C2的解析式为 2如果点Pxy是直线BC上方抛物线C1上的一个动点． ①若∠PCA＝∠ABO时求P点的坐标 ②如图2过点P作x轴的垂线交直线BC于点M交抛物线C2于点N记h＝PM+NM+BM求h与x的函数关系式当﹣5≤x≤﹣2时求h的取值范围．
如图在平面直角坐标系中函数y＝kx与的图象交于AB两点过A作y轴的垂线交函数的图象于点C连接BC则△ABC的面积为
下面是一道确定点P位置的尺规作图题的作图过程． 如图1直线L1与L2相交于点OAB是L2上两点点P是直线L1上的点且∠APB＝30°请在图中作出符合条件的点P． 作法如图2 1以AB为边在L2上方作等边△ABC 2以C为圆心AB长为半径作⊙C交直线L1于P1P2两点．则P1P2就是所作出的符合条件的点P． 请回答该作图的依据是．
下列等式成立的是
随着高铁的建设春运期间动车组发送旅客量越来越大相关部门为了进一步了解春运期间动车组发送旅客量的变化情况针对2014年至2018年春运期间的铁路发送旅客量情况进行了调查过程如下． Ⅰ收集整理数据 请将表格补充完整 Ⅱ描述数据 为了更直观地显示动车组发送旅客量占比的变化趋势需要用填“折线图”或“扇形图”进行描述 Ⅲ分析数据做出推测 预估2019年春运期间动车组发送旅客量占比约为你的预估理由是．
假定你是中国高中生李华今年暑假期间将去澳大利亚悉尼南部Kogarah的一所综合性学校KogarahHighSchool学习一个月并将寄宿在当地的居民Silvia家中.请给Silvia写一封电子邮件询问一些将在Kogarah生活的有关情况.具体询问内容如下 1.住宿是否可以有单间2.房间里是否有网络 3.是否可以自己煮饭4.是否有便利的交通. 注意1.词数100左右 2.可适当增加细节以使行文连贯. 3.开头语和结束语已为你写好不计入总词数. DearSilvia GreetingsfromChina!IanLiHuaahighschoolstudentinChina.. Lookingforwardtoyourreply. Bestwishes. Yourssincerely LiHua.
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