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如图,点A(m,5),B(n,2)是抛物线C1:y=(x-2)2+1上的两点,将抛物线C1向左平移,得到抛物线C2,点A,B的对应点分别为点A',B'.若曲线段AB扫过的面积为9(图中的阴影分),则...
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如图已知抛物线y=ax2+bx+3交x轴于AB两点A在B左边交y轴于C点且OC=3OA对称轴x=1交
如图抛物线y=ax2﹣2x+ca≠0与x轴y轴分别交于点A.B.C.三点已知点A.﹣20点C.0﹣8
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.
如图抛物线y=x2在第一象限内经过的整数点横坐标纵坐标都为整数的点依次为A1A2A3An.将抛物线y
已知抛物线ly=ax2+bx+cabc均不为0的顶点为M.与y轴的交点为N.我们称以N.为顶点对称轴
如图已知抛物线C1y=ax+22-5的顶点为P与x轴相交于AB两点点A在点B的左侧点B的横坐标是1.
如图已知抛物线与x轴交于A.m0B.n0两点与y轴交于点C.03点P.是抛物线的顶点若m-n=-2m
如图已知抛物线y=x2+bx+c经过点1﹣5和﹣241求这条抛物线的解析式2设此抛物线与直线y=x相
如图顶点M.在y轴上的抛物线与直线y=x+1相交于A.B.两点且点A.在x轴上点B.的横坐标为2连结
如图1点A.为抛物线C.1y=x2-2的顶点点B.的坐标为10直线AB交抛物线C.1于另一点C.1求
在平面直角坐标系xOy中抛物线y=﹣x2+mx+n与x轴交于点A.B.A.在B.的左侧.1抛物线的对
如图从点M.x04发出的光线沿平行于抛物线y2=8x的对称轴方向射向此抛物线上的点P.经抛物线反射后
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如图已知抛物线C1y=ax+22-5的顶点为P与x轴相交于AB两点点A在点B的左边点B的横坐标是1.
如图平面直角坐标系中抛物线y=ax2+bx+2与x轴分别交于点A.﹣10B.30与y轴交于点C.连结
如图已知抛物线y2=2pxp>0的焦点为F.A.在抛物线上其横坐标为4且位于x轴上方A.到抛物线准线
已知抛物线y=ax-m2+n与y轴交于点A.它的顶点为点B.点A.B.关于原点O.的对称点分别为C.
如图1点A.为抛物线C.1的顶点点B.的坐标为10直线AB交抛物线C.1于另一点C.1求点C.的坐标
抛物线y=-x2+bx+c经过点A.B.C.已知A.-10C.03.1求抛物线的解析式2如图1P.为
抛物线L.y=-x2+bx+c经过点A.01与它的对称轴直线x=1交于点B.1直接写出抛物线L.的解
如图抛物线y=﹣x2+bx+c与x轴交于A.10B.﹣40两点1求该抛物线的解析式2设1中的抛物线交
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利尿酸是奥运会禁止使用的兴奋剂之一其结构简式如图.下列有关利尿酸的说法中正确的是
如图在四棱锥P﹣ABCD中底面ABCD为平行四边形PA⊥底面ABCDAB=AD=AP=2∠ABC=60°. I证明平面PCA⊥平面PCD Ⅱ设E为侧棱PD上一点若直线CE分别与平面ABCD平面PBC所成的角相等求的值.
过抛物线x2=8y的焦点F作倾斜角为锐角的直线l与抛物线相交于AB两点M为线段AB的中点O为坐标原点则直线OM的斜率的取值范围是.
阅读下面短文掌握其大意从每题所给的ABCD四个选项中选出最佳选项并在答题卡上将该项涂黑. MyyoungerbrotherwouldbeleavingforcollegeandIwasleavingforanewjobinEurope.Weonlyhadafewpreciousmonthsleftasafamilylivingunderthesame41.Everythingwouldchangeinthe42. Afamilyofmagpies喜鹊43inourmapletree.Thisfamilyseemedtobeextraordinarilylively.Oneearlymorningthenoisewasso44thatmydadwentouttoseewhatthebirdsweredoing.Hefoundayoungmagpie45aroundtheyardflapping拍打hislittlewingsandyelling. DadlookedupinthetreetofindMommyandDaddyMagpiesittingonabranchandglaring46athim.Hehadtodosomethingforthepoorlittlething.Dadcalledthezoofor47.Theytoldhimnotto48itandassuredhimthebabywouldlearntoflyonitsown.Dadnolonger49themagpiearoundtheyard.Hedidhoweverwatchhim50fromthelivingroomwindowjusttomakesureacatdidn'tturnhiminto51. ThenextdayIgota52atmysummerjob.Itwasfrommyfather.Henevercalledme53.HeaskedmeifIsawMoreybeforeIlefthome﹣henamedthebirdMorey. DrivinghomefromworkI54itwasn'tonlyaboutthemagpiebutalsoabouthisownlittlefledglings幼鸟whowere55thenest.Itwasaboutmybrotherandme.DadfeltashelplessastheMommyandDaddybirdwatchinginthetree.Hecouldn'tmakeusflynorcouldhe56catsonceweleftthenest. Igothomeandfoundhimlookingoutofthekitchenwindowwith57inhiseyes.I58himbysayingMoreymighthavelearnttoflywithverygoodparentsraisinghim. SoonitwastheendofAugust.Bagswere59anditwastimeformybrotherandmetoleavethenest.IntheendDadhadnothingtoworryabout.He60hislittlefledglingswell.Andweflew… 41.A.house B.roof C.family D.room 42.A.fall B.spring C.winter D.summer 43.A.cutdown B.tookdown C.settleddown D.broughtdown 44.A.exciting B.low C.frightening D.loud 45.A.flying B.wandering C.running D.jumping 46.A.helplessly B.carefully C.hopefully D.suddenly 47.A.advice B.permission C.leave D.conclusion 48.A.hunt B.touch C.ignore D.chase 49.A.helped B.assisted C.followed D.collected 50.A.coldly B.cautiously C.purposely D.gladly 51.A.taste B.nest C.meat D.lunch 52.A.call B.message C.news D.notice 53.A.athome B.atschool C.atwork D.atnoon 54.A.summarized B.wondered C.realized D.questioned 55.A.building B.leaving C.directing D.quitting 56.A.driveaway B.fightagainst C.arguewith D.associatewith 57.A.light B.doubts C.pain D.tears 58.A.greeted B.comforted C.persuaded D.hugged 59.A.locked B.strengthened C.loaded D.packed 60.A.brought B.loved C.raised D.accompanied
在直角坐标系xOy中已知曲线C的参数方程为θ为参数. Ⅰ以原点O为极点x轴正半轴为极轴建立极坐标系求曲线C的极坐标方程 Ⅱ设AB为曲线C上两动点且OA丄OB求|AB|的取值范围.
某种活性细胞的存活率y%与存放温度x℃之间具有线性相关关系样本数据如表所示 经计算得回归直线的斜率为﹣3.2.若存放温度为6℃则这种细胞存活率的预报值为%.
在△AOB中OA=OB=1OA⊥OB点C在AB边上且AB=4AC则=
SeeacellphonecoverthatyoulikeonTaobao?Forgetaboutplacinganorderpayingthebillonlineandwaitingfordaysforittobedeliveredtoyou.Inthenearfutureyou'llbeabletogetitinminutesjustbyhittingprintonyourcomputer.Youmightfindithardtobelievethatyoucouldactuallyprintanobjectlikeyouwouldapicture.Butitisnotthathardtounderstandhowitwouldwork.Justasatraditionalprinterspraysinkontopaperlinebylinemodern3Dprintersspreadmaterialontoasurfacelayerbylayerfromthebottomtothetopgraduallybuildingupashape. Insteadofinkthematerialsthe3Dprinterusesaremainlyplasticresin树脂andcertainmetals.Thethinnereachlayeris﹣fromamillimetretolessthanthewidthofahair﹣thesmootherandfinertheobjectwillbe.Thismaysoundlikeacompletelynewtechnologybutthetruthisthat3Dprintinghasbeenaroundsincethelate1980s.Backthenitwasbarelyaffordableformostpeoplesofewknewaboutit. Lastyearthoughsawabigchangeinthe3Dprintingindustry﹣printersbecamemuchcheaper.Forexample10yearsagoadesktop3Dprintermighthavecost£20000whilenowtheycostonlyabout£1000accordingtotheBBC.Takenoutofthefactoryandintroducedtomorediverseandcommonuses3Dprintingcancreatejustaboutanythingyoucanthinkof﹣flutesbikinisjewelryaircraftpartsandevenhumanorgans.InfactscientistsfromCornellUniversityinNewYorkhavejustmadeanartificialearusinga3DprinteraccordingtoScienceDaily.Thefakeearlooksandactsexactlylikeanaturalone. Howeveras3Dprintingbecomesmorecommonitmaybringaboutcertainproblems﹣suchaspiracy.Onceyoucandownloadacoffeemakerorprintoutanewsetofkitchenutensils餐具onyourpersonal3Dprinterwhowillvisitaretailstoreagain?anexpertin3DprintingtoldForbesNews.Evenmorefrighteningwhatifanyoneintheworldcouldusea3Dprintertoprintoutafullyfunctioninggun? 32.Accordingtothearticleinthefuturethe3Dprintingtechnologywill. A.enablepeopletomakebetterpurchasesonline B.changethewaywemakemanyproducts C.beappliedaswidelyinourdailylifeascomputers D.shortenthetimeittakesforpeopletogetwhattheybuyonline 33.Whathappenedinthe3Dprintingindustrylastyear? A.The3Dprintingtechnologywastakenoutofthefactory. B.The3Dprintingtechnologybegantobeusedinvariousfields. C.The3Dprinterwasusedformedicaltreatmentforthefirsttime. D.The3Dprinterbecamemoreaffordableforconsumers消费者. 34.Whatisthebesttitleofthepassage? A.GreatDemandfor3DPrinters B.TechnologyintheFuture C.OnlineShoppingDisappearing D.PrintingoutEverything 35.Howisthelastparagraphdeveloped? A.Bygivingexamples. B.Bymakingcomparisons. C.Byanalyzingthecauseandeffect. D.Byusingfigures.
Papaasasonofadirt﹣poorfarmerleftschoolearlyandwenttoworkinafactoryforeducationwasfortherichthen.Sotheworldbecamehisschool.Withgreatinteresthereadeverythinghecouldlayhishandsonlistenedtothetowneldersandlearnedabouttheworldbeyondhistinyhometown.There'ssomuchtolearnhe'dsay.Thoughwe'rebornstupidonlythestupidremainthatway.Hewasdeterminedthatnoneofhischildrenwouldbedenied拒绝aneducation. ThusPapainsistedthatwelearnatleastonenewthingeachday.ThoughaschildrenwethoughtthiswascrazyitwouldneverhaveoccurredtoustodenyPapaarequest.Anddinnertimeseemedperfectforsharingwhatwehadlearned.Wewouldtalkaboutthenewsofthedaynomatterhowinsignificant微不足道的itwasnevertakenlightly.Papawouldlistencarefullyandwasreadywithsomecommentalwaystothepoint. Thencamethemoment﹣thetimetosharetheday'snewlearning. Papaattheheadofthetablewouldpushbackhischairandpouraglassofredwinereadytolisten. Felicehe'dsaytellmewhatyoulearnedtoday. IlearnedthatthepopulationofNepalis… Silence. Papawasthinkingaboutwhatwassaidasifthesalvation拯救oftheworldwoulddependuponit.ThepopulationofNepal.Hmm.Well…he'dsay.Getthemaplet'sseewhereNepalis.AndthewholefamilywentonasearchforNepal. Thissameexperiencewasrepeateduntileachfamilymemberhadaturn.Dinnerendedonlyafterwehadaclearunderstandingofatleasthalfadozensuchfacts. Aschildrenwethoughtverylittleabouttheseeducationalwonders.Ourfamilyhoweverwasgrowingtogethersharingexperiencesandparticipatinginoneanother'seducation.Andbylookingatuslisteningtousrespectingourinputaffirming肯定ourvaluegivingusasenseofdignity体面Papawasunquestionablyourmostinfluentialteacher. LaterduringmytrainingasafutureteacherIstudiedwithsomeofthemostfamouseducators.Theywereimparting传授whatPapahadknownallalong﹣thevalueofcontinuallearning.Histechniquehasservedmewellallmylife.NotasingledayhasbeenwastedthoughIcannevertellwhenknowingthepopulationofNepalmightproveuseful. 21.Whatdoweknowfromthefirstparagraph? A.Theauthor'sfatherwasborninaworker'sfamily. B.Thosebornstupidcouldnotchangetheirlife. C.Thetownelderswantedtolearnabouttheworld. D.Thepoorcouldhardlyaffordschooleducation. 22.Theunderlinedworditinthesecondparagraphrefersto A.onenewthing B.arequest C.thenews D.somecomment 23.Itcanbelearnedfromthepassagethattheauthor. A.enjoyedtalkingaboutnews B.knewverywellaboutNepal C.feltregretaboutthosewasteddays D.appreciatedhisfather'seducationaltechnique 24.Whatisthegreatestvalueofdinnertimetotheauthor? A.Continuallearning. B.Showingtalents. C.Familyget﹣together. D.WinningPapa'sapproval.
类比是一种重要的科学研究方法.某化学实验小组类比CuNO32受热分解的性质[2CuNO322CuO+4NO2↑+O2↑]猜测FeNO32也具有相似的性质并进行实验探究. 【提出问题】FeNO32受热分解生成的气体产物是什么留下的固体产物是什么 【查阅资料】NO2的熔点﹣11.C沸点21.C. 实验一实验小组同学设计如下装置探究FeNO32受热分解的气体产物成分. 1在加入硝酸亚铁以前必须进行的操作是. 2实验开始时打开K通一会儿N2关闭K点燃酒精灯加热一段时间在硬玻 璃管中观察到认为分解产生的气体中含有NO2. 3该实验中冰水混合物的作用是. 4收集满一瓶气体后用玻璃片盖紧集气瓶口将其从水槽中取出正放.接下来的操作及现象是证明集气瓶中收集到的气体是02. 实验二探究FeNO32受热分解得到的固体产物. 【提出猜想】 猜想一固体产物为Fe0猜想二固体产物为Fe203猜想三固体产物为Fe304猜想 四… 【进行实验】 5实验小组同学设计并完成以下实验. 【实验结论】 6猜想成立.FeNO32受热分解的化学方程式是.
设变量xy满足约束条件则z=x﹣y的取值范围为
在普通的纤维面料中加入一层“纳米Ti02”可生产自洁面料.工业上用钛铁矿主要成分为FeTi03含Fe203Fe0Si02等杂质制取纳米级Ti02的简要流程如下 1上述流程中分离出残渣的操作名称是. 2试剂b的化学式是加入过量该试剂的目的是. 3③中加热的目的是用化学用语结合必要的文字进行说明. 4如下图所示以熔融Ca0为电解液电解Ti02可获得Ti.电解时阳极的电极反应式是. 5已知25℃101kPa时Cs+O2g═CO2g△H1=﹣393.5kJ/mol 2COg+O2g═2CO2g△H2=﹣566kJ/mol TiO2s+2Cl2g═TiCl41+O2g△H3=+140kJ/mol 则TiO2s+2Cl2g+2Cs═TiCl41+2COg的△H=.
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已知且2sin2α<0则的值为
已知函数y=ex的值域为集合A不等式x2﹣x﹣6<0的解集为集合B则A∪B=
设ab∈01∪1+∞定义运算则
盐卤中除含有Mg2+Cl﹣外还含有少量Na+Fe2+Fe3+SO42﹣和CONH22等.从海水提取食盐和Br2后的盐卤中可以提取MgCl2MgOMgOH2等物质制备流程如图所示 1从MgCl2溶液得到MgCl2.6H2O晶体的过程中所需的基本操作顺序依次为 A.加热蒸馏B.加热浓缩C.冷却结晶D.趁热过滤E.过滤洗涤 2制取无水氯化镁必须在氯化氢存在的条件下进行原因是用适当的文字结合化学用语说明 3用NaClO除去尿素CONH22时生成物除盐外都是能参与大气循环的物质则该反应的化学方程式为加入NaClO的另一个作用是 4MgOH2是制镁盐耐火材料和阻燃剂的重要原料. 已知25℃时Ksp[MgOH2]=5.6×10﹣12且MgOH2s═MgOs+H2Os△H=+81.5kJ/mol. ①下列叙述正确的是 A.从盐卤或海水中获得MgOH2工业上选择NaOH作沉淀剂 B.MgOH2能作阻燃剂的原因是它分解吸热且生成MgO覆盖可燃物 C.可加热MgOH2得到MgO再电解熔融的MgO制金属镁 ②酸碱指示剂百里酚蓝变色的pH范围如下 25℃时在MgOH2的饱和溶液中滴加2滴百里酚蓝指示剂溶液的颜色为.
下列命题中真命题的是
设i为虚数单位且则x=.
已知命题p∃x0>0x0+a﹣1=0若p为假命题则a的取值范围是
在一定温度下将6molCO2和8molH2充入2L恒容密闭容器中发生反应CO2g+3H2g⇌CH30Hg+H2OgAH<O一段时间后达到平衡.反应过程中测定的数据如下表.下列说法正确的是
化学与生产生活和社会可持续发展密切相关.下列说法不正确的是
用石油裂解产物A可合成多种产物如F是一种称为富马酸二甲酯的杀菌剂下图用A合成一些有机产物的转化关系 1上述反应中属于加成反应的有填序号. 21H核磁共振谱图表明A分子只有两种化学环境不同的氢原子红外光谱研究表明A分子中含有两个碳碳双键请写出D的结构简式 3写出B转化为C的化学方程式. 4H物质在浓硫酸存在下可分别生成一种含六元环七元环八元环的产物写出生成六元环产物的化学方程式. 5写出与A互为同分异构体且分子中有4个碳原子共直线的有机物的结构简式. 6认真观察合成路线C→E回答下列2个问题 a.从C到E用了③⑥⑦三步反应而不是一步进行这样做的原因是 b.D被氧化成HOOC﹣CH2CHClCOOH的过程中会有中间产物生成检验该中间产物的试剂是.
用数学归纳法证明“n∈N•”则当n=k+1时应当在n=k时对应的等式的两边加上
①已知p3+q3=2求证p+q≤2用反证法证明时可假设p+q>2②设a为实数fx=x2+ax+a求证|f1|与|f2|中至少有一个不小于用反证法证明时可假设且以下说法正确的是
常温下下列各组离子成分子在指定溶液中能大量共存的是
已知双曲线Ca>0b>0点AB在双曲线C的左支上0为坐标原点直线B0与双曲线C的右支交于点M.若直线AB的斜率为3直线AM的斜率为1则双曲线C的离心率为
设函数已知fx的最小正周期为4π且当时fx取得最大值.将函数fx的图象向左平移个单位得函数gx的图象则下列结论正确的是
已知椭圆C的两焦点分别为F10F20点E在椭圆C上且∠F1EF2=60°.I求椭圆C的标准方程Ⅱ过x轴正半轴上一点M作直线l交椭圆C于AB两点.问是否存在定点M使当直线l绕点M任意转动时为定值若存在求出定点M的坐标若不存在说明理由.
将正整数n表示为其中a1=1当0≤i≤k﹣1时a1为0或1.记kn为上述表示式中a1为0的个数例如则k3×210+k218﹣3=
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