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已知点P(﹣2,0),设不垂直于x轴的直线l与抛物线y2=4x交于不同的两点A、B,若x轴是∠APB的角平分线,则直线l一定过点( )
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高三下学期数学《》真题及答案
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如图在平面直角坐标系中已知抛物线y=ax2+bx+c交x轴于A.20B.60两点交y轴于点.1求此抛
如图在平面直角坐标系xOy中已知直线lx-y-2=0抛物线C://y2=2pxp>0. 1若直线l
.已知抛物线y=ax2+bx+ca>0过-2023两点那么抛物线的对称轴
只能是x=-1
可能是y轴
在y轴右侧且在直线x=2的左侧
在y轴左侧且在直线x=-2的右侧
如图在平面直角坐标系中已知抛物线y=ax2+bx+c交x轴于A.20B.60两点交y轴于点.1求此抛
已知抛物线y=ax2+bx+ca>0过﹣2023两点那么抛物线的对称轴
只能是x=﹣1
可能是y轴
可能在y轴右侧且在直线x=2的左侧
可能在y轴左侧且在直线x=﹣2的右侧
如图1平移抛物线F.1y=x2后得到抛物线F.2.已知抛物线F.2经过抛物线F.1的顶点M.和点A.
已知抛物线y=m-1x2+m-2x-1与x轴交于A.B.两点.Ⅰ求m的取值范围;Ⅱ若m<0且点A.在
已知抛物线y=ax2+bx+ca≠0与x轴交于A.B.两点若点A.的坐标为﹣20抛物线的对称轴为直线
已知抛物线C.y2=2pxp>0P-10是抛物线C.的准线与x轴的交点过P.的直线l与抛物线C.交于
已知直线ly=x+mm∈R..1若以点M.20为圆心的圆与直线l相切于点P.且点P.在y轴上求该圆的
设抛物线C.y2=2pxp>0A.为抛物线上一点A.不同于原点O.过焦点F.作直线平行于OA交抛物线
已知圆C.:x2+y2+6x+8y+21=0抛物线y2=8x的准线为l设抛物线上任意一点P.到直线l
已知抛物线y=ax2+bx+ca≠0与x轴交于A.B.两点.若点A.的坐标为-20抛物线的对称轴为直
已知抛物线的对称轴是经过点20且与y轴平行的直线抛物线与x轴相交于点A.10与y轴相交于点B.03其
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已知抛物线C.:y2=2pxp>0其焦点为F.O.为坐标原点直线AB不垂直于x轴过点F.且抛物线C.
已知抛物线y=ax2+bx+ca>0过-2023两点那么抛物线的对称轴
只能是x=-1
可能是y轴
可能在y轴右侧且在直线x=2的左侧
可能在y轴左侧且在直线x=-2的右侧
已知抛物线C.:y2=4x及直线lx-y+4=0;户是抛物线C.上的动点记尸到抛物线C.准线的距离为
如图已知抛物线与x轴交于点A﹣20B40与y轴交于点C08.1求抛物线的解析式及其顶点D的坐标2设直
已知直线y=kx+2k>0与抛物线C.:y2=8x相交于A.B两点F为抛物线C.的焦点若FA=2FB
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如图所示足够长的光滑平行金属直导轨固定在水平面上左侧轨道间距为2d右侧轨道间距为d.轨道处于竖直向下的磁感应强度大小为B的匀强磁场中.质量为2m有效电阻为2R的金属棒静止在左侧轨道上质量为m有效电阻为R的金属棒b静止在右侧轨道上.现给金属棒a一水平向右的初速度v0经过一段时间两金属棒达到稳定状态.已知两金属棒运动过程中始终相互平行且与导轨良好接触导轨电阻忽略不计金属棒a始终在左侧轨道上运动则下列说法正确的是
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Music OperaatMusicHall:1243ElmStreet.TheseasonrunsJunethroughAugustwithadditionalperformancesinMarchandSeptember.TheOperahonorsEnjoytheArtsmembershipdiscounts.Phone:241﹣2742.http://www.cityopera.com. ChamberOrchestra:TheOrchestraplaysatMemorialHallat1406ElmStreetwhichoffersseveralconcertsfromMarchthroughJune.Call723﹣1182formoreinformation.http://www.chamberorch.com. SymphonyOrchestra:AtMusicHallandRiverbend.Forticketsalescall381﹣3300.RegularseasonrunsSeptemberthroughMayatMusicHallinsummeratRiverbend.http://www.symphony.org/home.asp. CollegeConservatoryofMusicCCM:Performancesareonthemaincampus校园oftheuniversityusuallyatPatriciaCobbettTheater.CCMorganizesavarietyofeventsincludingperformancesbythewell﹣knownLaSalleQuartetCCM'sPhilharmonicOrchestraandvariousgroupsofmusicianspresentingBaroquethroughmodernmusic.StudentswithI.D.cardscanattendtheeventsforfree.Afreescheduleofeventsforeachtermisavailablebycallingtheboxofficeat556﹣4183.http://www.ccm.uc.edu/events/calendar. RiverbendMusicTheater:6295KelloggAve.Largeoutdoortheaterwiththeclosestseatsundercoverpricedifference.Bignameshowsallsummerlong!Phone:232﹣6220.http://www.riverbendmusic.com. 1.Whichnumbershouldyoucallifyouwanttoseeanopera? A.241﹣2742. B.723﹣1182. C.381﹣3300. D.232﹣6220. 2.WhencanyougotoaconcertbyChamberOrchestra? A.February. B.May. C.August. D.November. 3.WherecanstudentsgoforfreeperformanceswiththeirI.D.cards? A.MusicHall. B.MemorialHall. C.PatriciaCobbettTheater. D.RiverbendMusicTheater. 4.HowisRiverbendMusicTheaterdifferentfromtheotherplaces? A.Ithasseatsintheopenair. B.Itgivesshowsallyearround. C.Itoffersmembershipdiscounts. D.Itpresentsfamousmusicalworks.
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马铃薯块茎储藏不当会出现酸味这种现象与马铃薯块茎细胞的无氧呼吸有关.下列叙述正确的是
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如图所示理想变压器原线圈和副线圈上接有阻值均为R的电阻R1R2原线圈接电压有效值为U的交流电源.现通过滑片P改变原线圈的匝数使原线圈和副线圈接人电路的匝数分别为n1n2则下列说法正确的是
Everyoneknowsthatfishisgoodforhealth.1Butitseemsthatmanypeopledon'tcookfishathome.Americanseatonlyaboutfifteenpoundsoffishperpersonperyearbutweeattwiceasmuchfishinrestaurantsasathome.Buyingstoringandcookingfishisn'tdifficult.2Thistextisabouthowtobuyandcookfishinaneasyway. 3Freshfishshouldsmellsweet:youshouldfeelthatyou'restandingattheocean'sedge.Anyfishyorstrongsmellmeansthefishisn'tfresh.4Whenyouhaveboughtafishandarrivehomeyou'dbetterstorethefishintherefrigeratorifyoudon'tcookitimmediatelybutfreshfishshouldbestoredinyourfridgeforonlyadayortwo.Frozenfishisn'tastastyasthefreshone. Therearemanycommonmethodsusedtocookfish.5Firstcleanitandseasonitwithyourchoiceofspices调料.Putthewholefishonaplateandsteamitinasteampotfor8to10minutesifitweighsaboutonepound.Alargeronewilltakemoretime.Thenit'sreadytoserve. A.Donotbuyit. B.Theeasiestistosteamit. C.Thisishowyoucandoit. D.Itjustrequiresalittleknowledge. E.Thefishwillgobadwithinhours. F.Whenbuyingfishyoushouldfirstsmellit. G.Thefatsinfisharethoughttohelppreventheartdisease. 1. 2. 3. 4. 5.
Ifyouareafruitgrower﹣orwouldliketobecomeone﹣takeadvantageofAppleDaytoseewhat'saround.It'scalledAppleDaybutinpracticeit'smorelikeAppleMonth.ThedayitselfisonOctober21butsinceithascaughtoneventsnowspreadoutovermostofOctoberaroundBritain. Visitinganappleeventisagoodchancetoseeandoftentasteawidevarietyofapples.TopeoplewhoareusedtothelimitedchoiceofapplessuchasGoldenDeliciousandRoyalGalainsupermarketsitcanbequiteaneyeopenertoseetherangeofclassicalapplesstillinexistencesuchasDeciowhichwasgrownbytheRomans.Althoughitdoesn'ttasteofanythingspecialit'sstillworthatryasistheknobbly多疙瘩的Cat'sHeadwhichismoreofacuriositythananythingelse. Therearealsovarietiesdevelopedtosuitspecificlocalconditions.OneoftheverybestvarietiesforeatingqualityisOrleansReinettebutyou'llneedawarmshelteredplacewithperfectsoiltogrowitsoit'sapipedreamformostappleloverswhofallforit. Attheeventsyoucanmeetexpertgrowersanddiscusswhichoneswillbestsuityourconditionsandbecausethesearefamilyaffairschildrenarewellcateredforwithapple﹣themedfunandgames. AppleDaysarebeingheldatallsortsofplaceswithaninterestinfruitincludingstatelygardensandcommercialorchards果园.IfyouwanttohavearealorchardexperiencetryvisitingtheNationalFruitCollectionatBrogdalenearFavershaminKent. 8.Whatcanpeopledoattheappleevents? A.Attendexperts'lectures. B.Visitfruit﹣lovingfamilies. C.Plantfruittreesinanorchard. D.Tastemanykindsofapples. 9.WhatcanwelearnaboutDecio? A.Itisanewvariety. B.Ithasastrangelook. C.Itisrarelyseennow. D.Ithasaspecialtaste. 10.WhatdoestheunderlinedphraseapipedreaminParagraph3mean? A.Apracticalidea. B.Avainhope. C.Abrilliantplan. D.Aselfishdesire. 11.Whatistheauthor'spurposeinwritingthetext? A.Toshowhowtogrowapples. B.Tointroduceanapplefestival. C.Tohelppeopleselectapples. D.Topromoteappleresearch.
如图所示为xOy平面直角坐标系在x=a处有一平行于y轴的直线MN在x=4a处放置一平行于y轴的荧光屏荧光屏与x轴交点为Q在第一象限内直线MN与荧光屏之间存在沿y轴负方向的匀强电场.原点O处放置一带电粒子发射装置它可以连续不断地发射同种初速度大小为v0的带正电粒子调节坐标原点处的带电粒子发射装置使其在xOy平面内沿不同方向将带电粒子射入第一象限速度与x轴正方向间的夹角为0≤θ≤.若在第一象限内直线MN的左侧加一垂直xOy平面向外的匀强磁场这些带电粒子穿过该磁场后都能垂直直线MⅣ进入电场.已知匀强磁场的磁感应强度大小为B带电粒子的比荷=电场强度大小E=Bv0不计带电粒子重力求 1粒子从发射到到达荧光屏的最长时间 2符合条件的磁场区域的最小面积 3粒子打到荧光屏上距Q点的最远距离.
某厂家为了测试新款汽车的性能将两辆完全相同的汽车并排停在检测场的平直跑道上tl=0时刻将两车同时启动通过车上的速度传感器描绘出了两车的速度随时间变化的规律图线如图所示.已知图象中两阴影部分的面积S2>S1则下列说法正确的是
如图所示在平面直角坐标系xOy第一四象限存在正方形匀强磁场区域ACDF原点0位于AC边中点磁感应强度的大小为B方向垂直平面向里.带电粒子以速度v0从0点沿x轴正方向射入磁场.不计粒子的重力. 1若正方形边长为l粒子恰从AF边中点射出求粒子的比荷 2设粒子从DF边某处飞出磁场且速度方向相对入射方向偏转θ角.若将磁场换成沿y轴负方向的匀强电场粒子也从DF边上射出时速度偏转角仍为θ求此电场强度的大小.
IwasprobablyoneofthefewkidsinAmericawhoseparentsdidn'twantthemtogotocollege.Myfamilywasverybluecollar.Myparentswereneverabletoachievemorethangettingafactoryjobandtryingtomakeendsmeet.WhilegrowingupIwouldalwayssayIwantedtogotoanIvyLeagueuniversityandmydadwouldsaytherewasabsolutelynothingwrongwithourstateuniversity.Dadsuggestedthat'swhatIoughttoaimfor.BythetimesenioryearapproachedIsentoutonlytwoapplicationsforcollegeonetothestateuniversityalittlemorethantwohoursawayfrommyhometownandonetoauniversityinanotherstate.Iwasquicklyacceptedintobothbutmydadseemedtobeagainsttheideaofmygoingawayforuniversity.Hewantedmetoattendtheoneinourcountyandsavemoneybycontinuingtoliveathome. ForwhateverreasonIhadbeengivenmoreambitionthanmyparentsbeforemeormytwoyoungerbrothersbothofwhomchosethefactorysceneratherthaneducation.SoeverydayafterschoolmydadandIhadfightsaboutwhereIwouldgotouniversity.HislogicwasverysoundespeciallyconsideringwhereIstandnowthreeyearsaftergraduationwithdebtuptomyeyeballs.HethreatenedtogivemenofinancialhelpatallandIsaidthatwasfineandIwouldbeabletogetenoughloans. ThefightsaboutwhereIwasgoingtogetthemoneycontinueduntilthedayIpackedeverythingupintoourcar.Itwasthenatbreakfastbeforewemadeourjourneydownthatmydadsaidhewasproudofme.Hehadn'tthoughtIwouldactuallyleave.AsmyparentsdroppedmeoffatmydormroommymomstartedcryingandevenmydadkissedmeontheforeheadwhichwasthefirsttimeIcouldremembergettinghuggedandkissedbytheminyears. Atthispointmyrelationshipwithmyparentschanged.They'vedonewelltoleavemetomyownlifeandtojustbehappywhenIcallhome.NomatterwhathappensnowIknowstandingmygroundonwheretogoforuniversityhasbeenthebestdecisionofmylifeasIhavegainedbotheducationandalifeexperience. 1.Whywasgoingtoafarawaycollegelessadvisabletothefather? A.Thepoorfamilycouldnotaffordtheeducationandboardingfees. B.Goingtocollegewasnotapopularideainthosedays. C.Thehometownuniversitywasasgoodasthestateuniversityinteaching. D.Hewaslessambitiousthanhisson. 2.Whichwordcanbestreplacetheunderlinedwordsoundinparagraph2? A.wrong B.complex C.confusing D.reasonable 3.Therelationshipbetweentheauthorandhisparentschangedforthebetterwhen. A.hedecidedtogotoanIvyLeagueuniversity B.hewasacceptedintobothoftheuniversities C.hebeganthejourneytohisuniversity D.hefirstcalledhomefromhisuniversity 4.Whichofthefollowingcanbethebesttitleforthepassage? A.StickingtoYourDreamUniversity B.MakingtheBestDecisionofMyLife C.ImprovingRelationshipbetweenParentsandSon D.ChangingFather'sAttitudetoCollegeEducation
环境中的内分泌干扰物是与某种性激素分子结构类似的物质对小鼠的内分泌功能会产生不良影响.回答下列问题. 1通常机体内性激素在血液中的浓度与靶细胞受体结合并起作用后会. 2与初级精母细胞相比精细胞的染色体数目减半原因是在减数分裂过程中. 3小鼠睾丸分泌的激素通过体液发挥调节作用.与神经调节相比体液调节的特点有答出4点即可.
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