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如图,点A的坐标为(-1,0),AB⊥x轴,∠AOB=60°,点B在双曲线l上,将△AOB绕点B顺时针旋转90°得到△CDB,则点D 双曲线l上(填“在”或“不在”).
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如图Rt△AOB的直角边OAOB分别与y轴x轴重合点A.B.的坐标分别是0430将△AOB向右平移当
如图在平面直角坐标系中抛物线y=ax2+bx+ca≠0的图象经过M.10和N.30两点且与y轴交于D
如图将含有300角的直角三角板ABC放入平面直角坐标系顶点AB分别落在xy轴的正半轴上∠OAB=60
如图已知二次函数y=x2+bx+c的图像的对称轴为过点10且与y轴平行的直线点A.B.均在图像上且直
已知点A04B点在x轴上AB与坐标轴围成三角形面积为2则B点坐标为
B(1,0)或(﹣1,0)
B(1,0)
B(﹣1,0)
B(0,﹣1)或B(0,1)
如图在平面直角坐标系中已知点A.04B.﹣30连接AB.将△AOB沿过点B.的直线折叠使点A.落在x
如图直线AB与x轴交于点A.10与y轴交于点B.0﹣2.1求直线AB的解析式2若直线AB上的点C.在
在平面直角坐标系中已知A.B.是抛物线y=ax2a>0上两个不同的点其中A.在第二象限B.在第一象限
已知二次函数y=﹣x2+2x+1的顶点为A与y轴交点为B动点Px0在x轴上运动当线段AP与线段BP之
(﹣1,0)
(1,0)
(﹣
,0)
(
,0)
如图在平面直角坐标系中A.点坐标为80B.点坐标为06点C.是线段AB的中点.点P.在x轴上若以P.
若x轴上的点P.到y轴的距离为1则点P.的坐标为
(1,0)
(0,1)
(1,0)或(﹣1,0)
(0,1)或(0,﹣1)
如图在平面直角坐标系中已知点A.04B.﹣30连接AB.将△AOB沿过点B.的直线折叠使点A.落在x
如图在Rt△AOB中∠A=90o∠AOB=60o在边长为1的小正方形组成的网格中△AOB的顶点O.A
如图在平面坐标系中∠AOB=90°AB∥x轴OB=2双曲线y=经过点B.将△AOB绕点B.逆时针旋转
菱形ABCD在坐标系中位置如图所示点A.的坐标为﹣10点B.坐标为10点D.在y轴上∠DAB=60°
在平面直角坐标系中一点A到x轴的距离为0到y轴的距离为1则A点的坐标为
(0,1)或(0,﹣1)
(0,1)或(1,0)
(1,0)或(﹣1,0)
(﹣1,0)或(0,﹣1)
已知点A04B点在x轴上AB与坐标轴围成的三角形面积为2则B点坐标是
(1,0)或(﹣1,0)
(1,0)
(0,1)或(0,﹣1)
(﹣1,0)
如图A.-10C.14点B.在x轴上且AB=3.1求点B.的坐标并画出△ABC2求△ABC的面积
如图直线AB与x轴交于点A.10与y轴交于点B.0-2.14分求直线AB的解析式24分直线AB上是否
如图已知直线l与抛物线y2=x相交于A.x1y1B.x2y2两点与x轴相交于点M.若y1y2=-11
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某科研小组为探究干旱对大针茅草的影响进行了相关实验结果如表所示.回答下列问题 1与对照组相比在干旱条件下大针茅草的光合速率填“升高”“降低”或“不变”原因是. 2实验结果表明干旱时大针茅草通过提高缓解干旱对它的伤害增强抗旱能力但是严重干旱时细胞内水分亏缺会导致叶绿体超微结构破坏类囊体薄膜上的减少进而影响光反应. 3有研究表明钙CaCl2与脱落酸ABA都能够提高大针茅草抗旱能力并且混合使用效果更佳请简要写出证明该观点的实验设计思路.
小白鼠是研究生命活动调节的常用实验动物.回答下列有关问题 1研究人员将鼠笼中暗设的电极突然通电发现小白鼠迅速将踩住电极的前肢移开小白鼠躲避电击的过程主要是通过调节来完成的该过程中的效应器是指前肢的. 2研究人员发现小白鼠的肝细胞膜上存在着与胰高血糖素特异性结合的糖蛋白这说明激素调节的特点是. 3研究发现小白鼠的T细胞活性下降机体产生抗体的量会明显下降原因是.
人体内环境稳态是机体进行正常生命活动的必要条件.神经﹣体液﹣免疫调节网络是机体维持稳态的主要调节机制.下列相关的叙述中正确的有几项 ①细胞内液血浆组织液和淋巴共同构成了机体内细胞生活的直接环境 ②神经调节的基本活动方式是反射完成反射的结构基础是神经元兴奋一般是从一个神经元的轴突传至另一神经元的树突或胞体 ③激素是通过体液的传输作用于靶细胞或靶器官的信息分子 ④血糖的平衡调节是通过体液调节完成的 ⑤恒温动物维持体温的恒定是通过神经调节完成了体内产热量和散热量平衡的过程 ⑥体液免疫过程中有吞噬细胞参与的阶段有两次.
MostpeopleknowthatMarieCuriewasthefirstwomantowintheNobelPrizeandthefirstpersontowinittwice.HoweverfewpeopleknowthatshewasalsothemotherofaNobelPrizewinner. BorninSeptember1897IreneCuriewasthefirstoftheCuries'twodaughters.AlongwithnineotherchildrenwhoseparentswerealsofamousscholarsIrenestudiedintheirownschoolandhermotherwasoneoftheteachers.ShefinishedherhighschooleducationattheCollegeofSévignéinParis. IreneenteredtheUniversityofParisin1914toprepareforadegreeinmathematicsandphysics.WhenWorldWarIbeganIrenewenttohelphermotherwhowasusingX﹣rayfacilities设备tohelpsavethelivesofwoundedsoldiers.IrenecontinuedtheworkbydevelopingX﹣rayfacilitiesinmilitaryhospitalsinFranceandBelgium.HerserviceswererecognisedintheformofaMilitary'sMedalbytheFrenchgovernment. In1918Irenebecamehermother'sassistantattheCurieInstitute.InDecember1924FredericJoliotjoinedtheInstituteandIrenetaughthimthetechniquesrequiredforhiswork.Theysoonfellinloveandweremarriedin1926.TheirdaughterHelenewasbornin1927andtheirsonPierrefiveyearslater. LikehermotherIrenecombinedfamilyandcareer.LikehermotherIrenewasawardedaNobelPrizealongwithherhusbandin1935.Unfortunatelyalsolikehermothershedevelopedleukemiabecauseofherworkwithradioactivity辐射能.IreneJoliot﹣CuriediedfromleukemiaonMarch171956. 1WhywasIreneCurieawardedaMilitaryMedal? A.Becauseshereceivedadegreeinmathematics. B.Becauseshecontributedtosavingthewounded. C.BecauseshewontheNobelPrizewithFrederic. D.Becausesheworkedasahelpertohermother. 2WheredidIreneCuriemeetherhusbandFredericJoliot? A.AttheCurieInstitute. B.AttheUniversityofParis. C.Atamilitaryhospital. D.AttheCollegeofSévigné. 3WhenwasthesecondchildofIreneCurieandFredericJoliotborn? A.In1932. B.In1927. C.In1897. D.In1926. 4InwhichofthefollowingaspectswasIreneCuriedifferentfromhermother? A.Ireneworkedwithradioactivity. B.Irenecombinedfamilyandcareer. C.IrenewontheNobelPrizeonce. D.Irenediedfromleukemia.
假如你是高二学生李华你的英国好友John邀请你这个暑假去伦敦旅游但你暑假有学习计划不能前往请你写一封信.要点如下 1.表达遗憾 2.说明理由 3.希望有机会再去. 注意1.可以适当补充细节以使行文连贯 2.词数80左右.
红细胞生成素EPO是体内促进红细胞生成的一种糖蛋白可用于治疗肾衰性贫血等疾病其制备过程如图所示 回答下列问题 1科研人员可以在基因文库中获得含人EPO基因的DNA片段理论上基因组文库含有的基因数量多于cDNA文库中的其原因是. 2步骤①中利用PCR技术扩增EPO基因时首先根据设计出两种引物.为便于后续的剪切和连接应在两种引物的一端分别加上和序列. 3将EPO基因导入到CHO之前要构建基因表达载体的目的是同时使目的基因能够表达并发挥作用. 4科研人员提取了经步骤③获得的重组CHO中的RNA后先通过获得DNA再进行PCR扩增最终未能检测出EPO基因其原因可能是至少答出两点. 5培养重组CHO时要定期更换培养液其目的是.
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Shakespeare'sBirthplaceandExhibitionofShakespeare'sWorld Welcometotheworld﹣famoushousewhereWilliamShakespearewasborninl564andwherehegrewup.Theproperty房产remainedintheownershipofShakespeare'sfamilyuntil1806.TheHousehaswelcomedvisitorstravelingfromallovertheworldforover250years. OPENINGTIMES 20Mar.to19Oct. Mon.toSat.900a.m.to500p.m. Sun930a.m.to500p.m. 20Oct.to19Mar Mon.toSat900a.m.to400p.m. Sun.1000a.m.to400p.m. ◆EnterthroughtheVisitors'Centreandseethehighly﹣praisedexhibitionShakespeare'sWorldalivelyandfullintroductiontothelifeandworkofShakespeare. ◆StandintheroomswhereShakespearegrewup. ◆DiscoverexamplesoffurnitureandneedleworkfromShakespeare'speriod. ◆Enjoythetraditional传统的Englishgardenplantedwithtreesandflowermentionedinthepoet'sworks. ◆TheBirthplaceiswithineasywalkingdistanceofallthecarparksshownonthemapnearestisWindsorStreet3minutes'Walk ◆TheHousemaypresentdifficultiesbuttheVisitors'Centreitsexhibitionandthegardenareaccessibletowheelchairusers. ◆TheShakespeareCoffeeHouseoppositetheBirthplace ADMISSION Adult£4.90 Child£2.20 Family£12.00 2adults+upto3children 1Howmuchistheadmissionforafamilyoftwogrown﹣upsandtwochildren? A.£9.80. B.£12.00. C.£14.20. D.£16.40. 2WhereisthenearestparkingplacetoShakespeare'sBirthplace? A.Behindtheexhibitionhall. B.OppositetheVisitors'Centre. C.AtWindsorStreet. D.NeartheCoffeeHouse. 3Awheelchairusermayneedhelptoenter. A.theHouse B.thegarden C.theVisitors'Centre D.theexhibitionhall
图甲表示小球藻的某生理过程科学家向小球藻培养液中通入放射性14CO2.在不同条件下连续测量小球藻细胞中14C标记的图甲中三种化合物的相对量其变化曲线如图乙所示.请据图回答下列问题. 1图甲所示生理过程发生在中若要使该过程持续稳定地进行必须由光反应持续提供和. 2图乙曲线abc分别表示图甲中化合物和相对量的变化. 3参照图甲分析出现图乙a曲线的原因是条件下小球藻吸收培养液中14CO2并逐渐合成使其上升突然停止该条件的处理光合作用的反应减弱不能继续被还原14CO2继续被固定使其再次上升.
Inyourdailylifetherearemanyexampleswhereyourparentscontrolhundreds1thingsforyouwhenyouareakidsuchastheclothesyouwearthefoodyoueatwhereyougoandhowyougetthere.Itisagoodthing.Kidsneedthiskindof2protectandhelpbecausetheyarenotoldenoughtotakecareof3andmakedecisions4correct.Butwithkidsgrowing5oldthepartofbeingateenisdevelopingyourownidentity﹣onethat6separatefromyourparents'.Differentattitudestowardseventslikepartyingmayleadtoargumentsbecauseyourparentswillalwayswanttoprotectyouandkeepyousafenomatterhowoldyouare.As7resultyourparentsfeelithardtogetusedtothenewsituationwith8increaseanxiety.Whatkidsshouldkeepinmindis9inmostcasesyourparentscanrelatetowhatyou'regoingthroughbecausethey10beteensonce.
T细胞主要包括抑制性T细胞Ts辅助性T细胞Th和胞毒性T细胞Tc.Tc能杀伤被病毒感染的细胞Th能通过分泌淋巴因子促进B细胞分化并提高Tc的杀伤力Ts能抑制Th的活性.下列分析错误的是
某地经过开垦后荒山变为果林洼地成为鱼塘加快了地方经济的发展和人民脱贫致富奔小康的步伐.回答下列问题 1山顶和山脚种植了不同的果木这体现了群落的结构. 2调查该果林的能量流动过程发现上一营养级同化的能量不能100%的流入下一营养级原因是. 3若鱼塘的环境条件不变经过捕捞后某种鱼的环境容纳量会填“变大”或“变小”或“不变”原因是. 4鱼塘生态系统需要人工不断地添加饲料以维持其正常功能从能量流动和物质循环的角度说明其原因是.
某雌雄异株植物的性别决定方式为XY型花色有白色黄色红色三种由仅位于X染色体上的等位基因Aa和位于常染色体上的等位基因Bb共同控制相关色素的合成过程如图所示.回答下列问题 1该植物花瓣中色素的合成过程说明基因与性状关系是. 2两红花植株杂交子代出现了的黄花植株则子代中红花植株与白花植株的比例为. 3请从第2题杂交实验的子代中选择实验材料设计一次杂交实验以确定某白花雌株的基因型写出相关的实验思路并预期实验结果和结论..
DuringmymiddleschoolyearsIwasveryallergictoEnglishgrammar.1thetwoincidentsI2laterchangedmyviewaboutlearningEnglish.3IthinkitisreallyfuntolearnEnglishgrammar.ItoccurredwhileIwas4inthemysteriousworldofiPhone.MyEnglishteacherwrotetwosentencesonthe51Thekingwouldwearnoclotheswhichmakehimappeardifferentlyfromothers.2Thekingwouldwearnoclotheswhichmakehimappeardifferentlyfromothers.Glancingatthetwo6Ithoughttheteachermusthavemadeamistake7thesetwosentenceswerethesame.Suddenlytheclassburstintoaloudlaughter.OnlythendidI8thataddingacommacouldshowabigdifferencein9.Afterwardsomething10happenedtome11.AtthebeginningofmyEnglishclassonedaytheteacher12ourhomeworkassignment.Tomy13myteacherhad14out﹣lyinthesentence‘IstudiedEnglishhardly'.'Isn't‘hardly'anadverb?'Iaskedmyself.LaterofcourseI15whatwaswrong.Iwasassumingeveryadjectiveaddedwith﹣lystill16themeaningofthatadjective.NottillthendidIfindoutthat‘hardly'17meant‘almostnot'sowhatIhad18madeaworldofdifferencefromwhatIwantedtosay.InconclusionwhatIexperiencedenablesmeto19Englishistrulyamysteriousworldofart.What20itistolearnEnglishgrammar!1A.However B.Besides C.Therefore D.Instead2A.witnessed B.heard C.experienced D.described3A.Then B.Soon C.Now D.Later4A.shocked B.absorbed C.rooted D.trapped5A.phone B.door C.window D.blackboard6A.sentences B.words C.phrases D.questions7A.whether B.because C.when D.if8A.ask B.wish C.realize D.hope9A.life B.form C.time D.meaning10A.interesting B.exciting C.strange D.awkward11A.before B.together C.yet D.again12A.checked B.returned C.found D.finished13A.disappointment B.joy C.surprise D.relief14A.handed B.worked C.carried D.crossed15A.figuredout B.gaveaway C.searchedfor D.talkedabout16A.creates B.hides C.explains D.keeps17A.finally B.gradually C.actually D.frequently18A.written B.known C.said D.seen19A.expect B.understand C.respond D.introduce20A.trouble B.fun C.difference D.magic
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Itisneverpossibletoleadalifewithoutanystress压力butitispossibletopreventstressaswellasreduceitseffectwhenitcan'tbeavoided.1.Tryphysicalactivity2.Runningwalkingplayingtennisandworkinginyourgardenarejustsomeoftheactivitiesyoumighttry.MaketimeforyourselfScheduletimeforbothworkandentertainment娱乐.Don'tforgetplaycanbejustasimportanttoyouroverallwell﹣beingaswork.3.Gowindow﹣shoppingorworkonahobby.Allowyourselfatleastahalfhoureachdaytodosomethingyouenjoy.Takecareofyourself4.Ifyoueasilygetangryandcan'tsleepwellenoughorifyou'renoteatingproperlyitwillbemorelikelythatyouwillfallintostressfulsituations.Ifstressrepeatedlykeepsyoufromsleepingyoushouldconsult咨询adoctor.5Stresscanresultfrom导致disorganizationandafeelingthat'there'ssomuchtodoandnotenoughtime'.Tryingtotakecareofeverythingatoncecanbetoomuchforyouandasaresultyoumaynotachieveanything.Insteadmakealistofeverythingyouhavetodoandthendoonethingatatimecheckingoffeachtaskasitiscompleted.Setouttodothemostimportanttaskfirst.A.Youshouldmakeeveryefforttoeatwellandgetenoughrest.B.Dowhateveryoulikeandwanttodo.C.Thefollowingaresuggestionsforwaystodealwithstress.D.Youneedabreakfromyourdailyroutinetojustrelaxandhavefun.E.Whenyouarenervousangryorupsettryreleasingthepressurethroughexerciseorphysicalactivity.F.Youcouldsmiletoyourselfinfrontofamirroreveryday.G.Makealistofthingstodo.
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某种产脂肪酶菌常被用作饲料添加剂如表是从土壤中初筛该菌的培养基配方请回答下列问题 1在上述培养基中榄油能为产脂肪酶菌提供.为增大产脂肪酶菌的浓度需用该培养基进行富集培养富集培养基宜选用液体培养基的原因是. 2用涂布平板法分离产脂肪酶菌时在上述培养基的基础上还应加入和溴甲酚紫碱性条件下呈紫色在酸性条件下为黄色.在平板上产脂肪酶菌菌落的周围会出现黄色圈原理是.筛选时常选择菌落大黄色圈直径大的菌落这说明此菌落. 3菌落是指由一个细胞繁殖而来的肉眼可见的子细胞群体.在平板上有的菌落较小呈乳白色表面光滑无丝状物这些菌落可能为填“细菌”或“霉菌”.有的菌落连成一片形成原因最可能是. 4研究发现在饲料中添加产脂肪酶菌剂后动物的体重明显增加这说明.
下列有关内环境稳态及调节的叙述错误的是
Inmostartmuseumsthepaintingsonthewalljustlookflatbutsometimesvisitorscomeacrossanimagethatappearstobethree﹣dimensional.Theartisthascleverlyusedcolorslinesandshadingtogivethepaintingsomedepthmakingitmorerealistic.Theartistictechniqueofcreatingthree﹣dimensionalimagesofsomethingonaflatsurfaceiscalledtrompeI'oeil.TodaysomeartistsareadaptingtheideaoftrompeI'oeiltomakethingsbecomeinvisiblewhichiscalledcamouflageart. Innatureusingcamouflagenotonlyallowsinsectsandanimalstohidefromtheirnaturalenemiesbutalsoallowsthemtogetcloseenoughtosurpriseotherinsectsorsmalleranimalsthattheywanttocatchandeat.Artistsarenothidingorpreparingtoattack.Insteadtheyareusingtheideaofcamouflagetomakeurbanspaceslooknicerortomakestatementswiththeirart. Itisnotdifficulttofindthingsthatwewouldliketomakedisappearsuchasthedullwallofalargeindustrialbuildingorthepolescarryingelectricitywires.Artistscanmakethesethingsmoreinterestingandinsomecaseslessvisible.Inmanyurbanareaslargebuildingshavebeenpaintedwithamazingpicturesthattrickoureyes.Thusordinarybrickwallsaretransformedintointerestingworksofart. Someartistsincludecamouflageintheirworktosaysomethingaboutthemodernworldwelivein.ForexampleAmericanartistTrinaMerrycamouflagespeoplesothattheydisappearinthelandscapesshe photographs.HerlatestseriesNewYorkCityblends融合womenandtheirenvironmenttocreateimagesthatcloselyexaminetherelationshipbetweenpeopleandwheretheylive.MyseriesshowsrespectforBigApplewomenwhofeeltheneedtoblendinwitheveryoneelseinNewYorkMerrysays.Ithinkmanywomenmoveherehopingtoliveacitylifewhentherealityisthatmostwomenhavetochangetheirfancydesignerheelsonthesubwayformorepracticalsneakers. 1Whichofthefollowingwordsbestdescribecamouflageart? A.Flat. B.Invisible. C.Dull. D.Disappointing. 2Whatisthepurposeofusingcamouflageinnature? A.Tomakeanimalslooknicer. B.Toexpresspeople'sartisticconcept. C.Tosurprisesmalleranimalsorinsects. D.Toprotectanimalsfromnaturalenemies. 3Fromthelastparagraphweknowthat. A.Merryfeeltheneedtofitinwithothersinthecity B.mostwomenwearfancydressesintheirdailylifeinthecity C.womeninNewYorkhavesucceededinbeingapartofthecity D.NewYorkcitycanpartlymirrorpeople'slifeinmodernsociety 4Thisarticleismainlyabout. A.aformofart B.theseriesofpaintings C.afamousartist D.thewomeninNewYork
Morepeoplewouldbe吸引tocyclingifconditionswererightincities.
Theruralenvironmenthasa积极的effectonthechildren'shealth.
Thepoliceputthe责备fortheaccidentonthedriver.
Iwillneverforgetthedarknessthepainandstrongdesiretodie. NovemberarrivedgreyandbusyandgoingintoanevenmorestressfulDecemberIwasfilledwithanxiousthoughts.Avisittomyfather'sgraveisoftenagoodchancetocryandwhenIleaveIfeelalittle moreatpeace.Butthistimewasdifferent.IdrovehomeandeverynightfortherestofthatweekIcried. OnSaturdayIwatchedaTVprogramteachingbakingandthenIstartedtolearn.BytheendoftheweekendIhadatablecoveredwithsweettreats.Ipackagedthemupintinsattachedalabeltoeachofthemwithwinterloveonitanddroppedthemoffonafewofmyneighbors'porches.Itshockedmehowmuchitlightenedmymoodseeingasmallpackagelostonaporch.ThethanksIreceivedlaterfromtheneighborsmademelightup.Itfeltsogoodanditdistractedmefrommydarkthoughts. ByJanuaryIhaddevelopedaroutineonSundayI'dbakecookiesandpackagethemupandonMondayI'ddeliverthem.EveryweekIaddedafewdifferentpeopletomydeliveryroute.Thenthingsstartedshowinguponmydoorstep﹣ahomemadecupapairofsockswithcookiesandevenagiftcertificatefromthelocalbookstore.Everysingleonemeltedmyheart.ButwhatIreallyappreciatedwashowpeoplebegantosharetheirownstoriesofmentalhealthwithme.Thereisnogreaterhonorthantobetrustedwithanother'slife.Iwasoverwhelmedbytheloveandcareofmycommunity.Ithumbledmethatsomethingsosimplehadcreatedsuchincrediblekindness. Iwasshiftingintoanewseasonoflightwhilelettinggoofaseasonofdarkness.Itremindedmethatthereisbeautyinbeingkindandthatlifeistoughbutthereisaquietstrengthinknowingyouarenotalone. 1Whatcanweknowabouttheauthorfromthefirsttwoparagraphs? A.Shefeltlifewastoopainfultolive. B.Shewasinabadphysicalcondition. C.Shewasstressedduetoherfather'sdeath. D.Sherecoveredaftervisitingherfather'sgrave. 2Aftershestartedsharingcookieswithneighborstheauthor. A.gainedtrustandcarefromthem B.addedotherthingstoherdeliverylist C.feltherlifewasnolongerbusyorstressful D.foundsomeofthemhadmorementalproblemsthanher 3Whatisthemainpurposeofthispassage? A.Toexpressgratitudetocaringneighbors. B.Tosharehowbeingkindhelpedherregainhope. C.Tospeakofthebenefitsofbakingcookiesathome. D.Toshowtheimportanceofatrustedcommunity.
种群增长率是指单位时间内新增加的个体数占种群个体总数的比率可表示为×100%.调查某种群一段时间内某些特征的变化得到如图AB两条曲线以下分析正确的是
如图为人体下丘脑参与的部分调节过程示意图.回答下列问题 1人在寒冷环境中下丘脑神经分泌细胞分泌的激素A是激素B只能作用于甲状腺细胞的原因是.甲状腺激素在人体中的作用是. 2若图中“下丘脑→激素A→垂体→激素B”过程调节着人体内性腺分泌性激素某人下丘脑功能正常但性激素含量不足原因是垂体或性腺两种器官中的某一器官功能受损.临床上可通过给患者注射激素填“A”或“B”然后检测血液中性激素的含量变化进行诊断若则说明垂体功能受损.
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