首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
如图，在直线坐标系xOy中，从原点处向+y方向同时发射出大量比荷为＝1.0×104C/kg的带负电粒子，粒子的初速度大小广泛分布于零到v0＝1.0×104m/s之间．已知这些粒子此后所经磁场的磁感应...
查看本题答案
包含此试题的试卷
高三下学期物理《》真题及答案
点击查看
你可能感兴趣的试题
在某一真空空间内建立xoy坐标系从原点O.处向第一象限发射一比荷＝1×104C／kg的带正电的粒子重
如图所示在某一真空空间建立xOy坐标系从原点O.处向第I.象限发射一比荷的带正电的粒子重力不计其速度
在某一真空空间内建立xOy坐标系从原点O处向第I象限发射一荷质比的带正电的粒子重力不计.速度大小v0
22分如图在直角坐标系xoy中点M.01处不断向+y方向发射出大量质量为m带电量为-q的粒子粒子的初
如图直角坐标系在一真空区域里y轴的左方有一匀强电场场强方向跟y轴负方向成θ=30°角y轴右方有一垂直
如图直角坐标系在一真空区域里y轴的左方有一匀强电场场强方向跟y轴负方向成θ=30°角y轴右方有一垂直
在直角坐标系xOy中直线l的方程为x－y＋4＝0曲线C.的参数方程为α为参数.1已知在极坐标系与直角
在直角坐标系xOy中以坐标原点为极点x轴正半轴为极轴建立极坐标系半圆C.的极坐标方程ρ=2cosθθ
如图所示匀强磁场方向垂直纸面向里匀强电场方向水平向右直角坐标系xoy的原点O.处有一能向各个方向发射
在某一真空空间内建立xoy坐标系从原点O.处向第Ⅰ象限发射一比荷=1×104c/kg的带正电的粒子重
如图建立平面直线坐标系xOyx轴在地平面上y轴垂直于地平面单位长度为1千米某炮位于坐标原点.已知炮弹
在直角坐标系xOy中直线l经过点P.－10其倾斜角为α.以原点O.为极点以x轴非负半轴为极轴与直角坐
如图所示在平面直角坐标系xOy内第Ⅰ象限的等腰直角三角形MNP区域内存在垂直于坐标平面向外的匀强磁场
在某一真空空间内建立xoy坐标系从原点O.处向第Ⅰ象限发射一比荷=1×104c/kg的带正电的粒子重
15分如图所示直角坐标系在一真空区域里y轴的左方有一匀强电场场强方向跟y轴负方向成θ=30º角y轴右
如图所示在x轴上方y≥0存在着垂直于纸面向里的匀强磁场磁感强度为B.在原点O.有一离子源向x轴上方的
在某一真空空间内建立xoy坐标系从原点O.处向第一象限发射一比荷的带正电的粒子重力不计速度大小v0
20分如图在直角坐标系xoy中点M.01处不断向+y方向发射出大量质量为m带电量为-q的粒子粒子的初
在直角坐标系xOy中直线l经过点P-10其倾斜角为α以原点O.为极点以x轴非负半轴为极轴与直角坐标系
如图所示直角坐标系在一真空区域里y轴的左方有一匀强电场场强方向跟y轴负方向成θ=30º角y轴右方有一
热门试题
更多
It'sapitythatwecan'tarrangeforouragendaotherwisewe______farmorefreedomduringthewholejourney. A.enjoyed B.hadenjoyed C.wouldhaveenjoyed D.wouldenjoy
把2支相同的晨光签字笔3支相同英雄钢笔全部分给4名优秀学生每名学生至少1支则不同的分法有
Agardenthat'sjustrightforyouHaveyouevervisitedagardenthatseemedjustrightforyouwheretheatmosphereofthegardenappearedtototalmorethanthesum总和ofitsparts?36.Butitdoesn'thappenbyaccident.Itstartswithlookinginsideyourselfandunderstandingwhoyouarewithrespecttothenaturalworldandhowyouapproachthegardeningprocess.●37Somepeoplemaythinkthatagardenisnomorethanplantsflowerspatternsandmassesofcolor.Othersareconcernedaboutusinggardeningmethodsthatrequirelesswaterandfewerfertilizers肥料.38.Howeverthereareanumberofotherreasonsthatmightexplainwhyyouwanttogarden.Oneofthemcomesfromourearliestyears.●Recall回忆yourchildhoodmemoriesOurmodelofwhatagardenshouldbeoftengoesbacktochildhood.Grandma'srosegardenandDad'svegetablegardenmightbegoodorbadbutthat'snotwhat'simportant.39﹣﹣howbeinginthosegardensmadeusfeel.Ifyou'dliketobuildapowerfulbondwithyourgardenstartbytakingsometimetorecallthegardensofyouryouth.40thengooutsideandworkoutaplantotranslateyourchildhoodmemoriesintoyourgrown﹣upgarden.Havefun.A.KnowwhyyougardenB.FindagoodplaceforyourowngardenC.It'sourexperienceofthegardenthatmattersD.It'sdelightfultoseesomanybeautifulflowersE.StillothersmaysimplyenjoybeingoutdoorsandclosetoplantsF.YoucanproducethatkindofmagicalqualityinyourowngardentooG.Foreachofthosegardenswriterdownthestrongestmemoryyouhave.
Readingcanbeasocialactivity.Thinkofthepeoplewhobelongtobookgroups.Theychoosebookstoreadandthenmeettodiscussthem.NowthewebsiteBookCrossing.comBookCrossing.comturnsthepageonthetraditionalideaofabookgroup.Membersgoonthesiteandregisterthebookstheyownandwouldliketoshare.BookCrossingprovidesanidentificationnumbertostickinsidethebook.Thenthepersonleavesitinapublicplacehopingthatthebookwillhaveanadventuretravelingfarandwidewitheachnewreaderwhofindsit.BrucePedersonthemanagingdirectorofBookCrossingsays'Thetwothingsthatchangeyourlifearethepeopleyoumeetandbooksyouread.BookCrossingcombinesboth.'Membersleavebooksonparkbenchesandbusesintrainstationsandcoffeeshops.Whoeverfindstheirbookwillgotothesiteandrecordwheretheyfoundit.Peoplewhofindabookcanalsoleaveajournalentrydescribingwhattheythoughtofit.E﹣mailsarethensenttotheBookCrossingtokeepthemupdatedaboutwheretheirbookshavebeenfound.Brucepetersonsaystheideaisforpeoplenottobeselfishbykeepingabooktogatherdustonashelfathome.BookCrossingispartofatrendamongpeoplewhowanttogetbacktothe'real'andnotthevirtual虚拟.Thesitenowhasmorethanonemillionmembersinmorethanonehundredthirty﹣fivecountries.29.Whydoestheauthormentionbookgroupsinthefirstparagraph?A.Toexplainwhattheyare.B.TointroduceBookCrossing.C.Tostresstheimportanceofreading.D.Toencouragereaderstosharetheirideas.30.Whatdoestheunderlinedword'it'inParagraph2referto?A.Thebook.B.Anadventure.C.Apublicplace.D.Theidentificationnumber.31.WhatwillaBookCrosserdowithabookafterreadingit?A.Meetotherreaderstodiscussit.B.Keepitsafeinhisbookcase.C.Passitontoanotherreader.D.Mailitbacktoitsowner.32.Whatisthebesttitleforthetext?A.OnlineReadingAVirtualTourB.ElectronicBooksAnewTrendC.ABookGroupBringsTraditionBackD.AWebsiteLinksPeoplethroughBooks.
What'sOn?ElectricUnderground7.30pm﹣1.00amFreeattheCyclopsTheatreDoyouknowwho'splayinginyourarea?We'rebringingyouaneveningofliverockandpopmusicfromthebestlocalbands.Areyouinterestedinbecomingamusicianandgettingarecordingcontract合同?Ifsocomeearlytothetalkat7.30pmbyJulesSkyeasuccessfulrecordproducer.He'sgoingtotalkabouthowyoucanfindtherightpersontoproduceyoumusic.GeeWhizz8.30pm﹣10.30pmComedyatKaleidoscopeComeandseeGeeWhizzperform.He'sthefunnieststand﹣upcomedianonthecomedyscene.Thisjoyfulshowwillpleaseeveryonefromtheyoungesttotheoldest.GeeWhizzreallyknowshowtomakeyoulaugh!Ourbarisopenfrom7.00pmfordrinksandsnacks快餐.Simon'sWorkshop5.00pm﹣7.30pmWednesdaysatVictoriaStageThisisagoodchanceforanyonewhowantstolearnhowtodocomedy.Theworkshoplooksateverykindofcomedyandpracticesmanydifferentwaysofmakingpeoplelaugh.Simonisacomedianandactorwhohas10years'experienceofteachingcomedy.Hisworkshopsareexcitingandfun.AneveningwithSimonwillgiveyoutheconfidencetobefunny.CharlotteStone8.00pm﹣11.00pmPizzaWorldFinefoodwithbeautifuljazzmusicthisisagreateveningout.CharlotteStonewillperformsongsfromhernewbest﹣sellingCDwithJamesPickeringonthepiano.ThemenuisItalianwithexcellentmeatandfreshfishpizzasandpasta面食.Bookearlytogetatable.Ourbarisopenalldayandservescocktailscoffeebeerandwhitewine.21.Whocanhelpyouifyouwanttohaveyourmusicproduced?A.JulesSkye.B.GeeWhizz.C.CharlotteStone.D.JamesPickering.22.Atwhichplacecanpeopleofdifferentagesenjoyagoodlaugh?A.TheCyclopsTheatreB.KaleidoscopeC.VictoriaStageD.PizzaWorld23.WhatdoweknowaboutSimon'sWorkshop?A.Itrequiresmembershipstatus.B.Itlaststhreehourseachtime.C.Itisrunbyacomedyclub.D.ItisheldeveryWednesday.24.WhenwillCharlotteStoneperformhersongs?A.5.00pm﹣7.30pm.B.7.30pm﹣1.00am.C.8.00pm﹣11.00pm.D.8.30pm﹣10.30pm.
10分It'snosecretthatdoinggoodmakesothershappy﹣butdidyouknowitcanmakeyouhappyaswell?Accordingtoastudypeopleparticipatinginmeaningfulactivitieswerehappierandfeltthattheirliveshadmorepurposethanpeoplewhoonlyengagedinpleasure﹣seekingbehaviors.Trygivingthesefourthingstootherstostartyourjourneytoahappierandhealthierlifestyle.1.YourTimeWithabusylifeitcanbehardtofindanytimetogiveaway.Howevervolunteeringyourtimehasgreatbenefitsincludingmakingnewfriendsandconnectionslearningnewskillsandevenadvancingyourcareer.Accordingtoapaperaboutthelinkbetweenhealthandvolunteeringvolunteeringisconnectedwithlowerinstancesofdepressionandreducestheriskofdyingby22percent.2.YourAttentionMostofusthinkwe'regoodlistenersbutaccordingtopsychologistPaulDonoghuemostpeopleareawarethatothersdon'tlistenaswellastheycould.Inadditionthey'renotfullyawarethattheythemselvesaren'tlistening.Whenpracticingmindfulnessmeditation正念禅修youfocusonwhatyouexperienceinthemomentandletyourthoughtsandemotionspassthroughwithoutjudgment.Didyouknowthatgivingsomeoneyourundividedattentionhelpsyoualso?Whendonewellactivelisteningstrengthensyourfocus﹣whichisamajorpartofgoodmeditation.3.YourCompassionThepsychologicalmeaningofcompassionistheabilitytounderstandanotherperson'semotionalstate.Compassiondiffersfromempathy移情inthatthosewhoexperiencecompassionnotonlyputthemselvesinanotherperson'sshoesbutalsowanttoreducethatperson'ssuffering.Abrain﹣imagingstudyshowedthatthebrain'spleasurecentersareequallyactivewhenwegivemoneytothepooraswhenwereceivemoneyourselves.4.YourMoneyAccordingtoanexperimentthosewhospendmoneyonotherpeoplearesignificantlyhappierthanthosewhospendthesamequantityofmoneyonthemselves.Whetherornotyoucanofferothergiftsdonatingmoneyhelpsmakerealchangehappen.Itrepresentstimespentcompassionandcarefulattentiontotheneedsofothers.
CO2与H2的混合气体5g在150℃时和足量的氧气混合用电火花充分引燃在相同状况下再将反应后所得混合气体通入到足量的Na2O2中测得Na2O2固体增重的质量为3.4g则原混合气体中CO2的物质的量分数为
假定你是李华你校摄影俱乐部photographyclub将举办国际中学摄影展.请给你的英国朋友Peter写封信.请他提供作品.信的内容包括 1.主题环境保护 2.展览时间 3.投稿邮箱intlphotoshow@gmschool.com. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
FiveyearsagowhenItaughtartataschoolinSeattleIusedTinkertoysasatestatthebeginningofatermtofindoutsomethingaboutmystudents.IputasmallsetofTinkertoysinfrontofeachstudentandsaid'MakesomethingoutoftheTinkertoys.Youhave45minutestoday﹣and45minuteseachdayfortherestoftheweek.'Afewstudentshesitatedtostart.Theywaitedtoseetherestoftheclasswoulddo.Severalotherscheckedtheinstructionsandmadesomethingaccordingtooneofthemodelplansprovided.Anothergroupbuiltsomethingoutoftheirownimaginations.OnceIhadaboywhoworkedexperimentallywithTinkertoysinhisfreetime.Hisconstructionsfilledashelfintheartclassroomandagoodpartofhisbedroomathome.Iwasdelightedatthepresenceofsuchastudent.Herewasanexceptionallycreativemindatwork.HispresencemeantthatIhadanunexpectedteachingassistantinclasswhosecreativitywouldinfect感染otherstudents.Encouragingthiskindofthinkinghasadownside.Irantheriskoflosingthosestudentswhohadadifferentstyleofthinking.Withoutfailonewoulddeclare'ButI'mjustnotcreative.''Doyoudreamatnightwhenyou'reasleep?''Ohsure.''Sotellmeoneofyourmostinterestingdreams.'Thestudentwouldtellsomethingwildlyimaginative.Flyingintheskyorinatimemachineorgrowingthreeheads.'That'sprettycreative.Whodoesthatforyou?''Nobody.Idoit.''Really﹣atnightwhenyou'reasleep?''Sure.''Trydoingitinthedaytimeinclassokay?'25.TheteacherusedTinkertoysinclassinorderto?A.knowmoreaboutthestudentsB.makethelessonsmoreexcitingC.raisethestudents'interestinartD.teachthestudentsabouttoydesign26.WhatdoweknowabouttheboymentionedinParagraph3?A.Helikedtohelphisteacher.B.Hepreferredtostudyalone.C.Hewasactiveinclass.D.Hewasimaginative.27.Whatdoestheunderlinedword'downside'inParagraph4probablymean?A.Mistake.B.Drawback.C.Difficulty.D.Burden.28.Whydidtheteacheraskthestudentstotalkabouttheirdreams?A.Tohelpthemtoseetheircreativity.B.Tofindoutabouttheirsleepinghabits.C.Tohelpthemtoimprovetheirmemory.D.Tofindoutabouttheirwaysofthinking.
一个长方体被一个平面截去一部分后所剩几何体的三视图如图所示则该几何体的体积为
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号Λ并在其下面写出该加的词. 删除把多余的词用斜线﹨划掉. 删除在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. Thesummerholidayiscoming.MyclassmatesandIaretalkingabouthowtododuringtheholiday.Wecanchosebetweenstayingathomeandtakeatrip.Ifwestayathomeitiscomfortablebutthereisnoneedtospendmoney.Butinthatcasewewilllearnlittleaboutworld.Ifwegoonatripabroadwecanbroadenyouviewandgainknowledgeswecannotgetfrombooks.Someclassmatessuggestwecangotoplacesofinterestnearby.Ithoughtthatitisagoodidea.Itdoesnotcostmanyyetwecanstilllearnalot.
下列说法正确的是
Hundredsofpeoplehaveformedimpressionsofyouthroughthatlittledevice装置onyourdesk.Andthey'veneveractually41you.Everythingtheyknowaboutyou42throughthisdevicesometimesfromhundredsofmilesaway.43heyfeeltheycanknowyou44fromthesoundofyourvoice.That'showpowerfulthe45is.Powerfulyesbutnotalways46.ForyearsIdealtwithmytravelagentonlybyphone.RanimyfacelessagentwhomI'dnevermet47gotmerock﹣bottompricesonairfarescarsandhotels.Buthercoldvoicereally48me.Isometimeswishedto49anotheragent.OnemorningIhadto50animmediateflighthomeforafamilyemergency.IranintoRani'soffice51.Thewomansittingatthedesk52mymadnesssympatheticallyjumpedup.Shegavemea53smilenoddedwhilelisteningpatientlyandthenprintedoutthe54immediately.'Whatawonderfullady!'Ithought.Rushingout55Icalledoutovermyshoulder'Bythewaywhat'syourname?''I'mRani'shesaid.Iturnedaroundandsawa56womanwithabigsmileonherfacewavingtowishmeasafetrip.Iwas57!WhyhadIthoughtshewascold?Raniwaswellso58.SittingbackinthecaronthewaytotheairportIfigureditallout.Rani's59﹣﹣﹣herwarmsmilehernodsher‘I'mhereforyou'60﹣﹣﹣wereallsilentsignalsthatdidn'ttravelthroughwires.41.A.accepted B.noticed C.heard D.met42.A.came B.moved C.ran D.developed43.A.Thus B.Yet C.Then D.Indeed44.A.rather B.also C.just D.already45.A.Telephone B.voice C.connection D.impression46.A.direct B.useful C.easy D.accurate47.A.inperson B.bymyself C.inpublic D.onpurpose48.A.annoyed B.interested C.discouraged D.confused49.A.promote B.train C.find D.know50.A.arrange B.postpone C.confirm D.book51.A.forthefirsttime B.atanytime C.fromtimetotime D.ingoodtime52.A.expecting B.seeing C.testing D.avoiding53.A.shy B.comforting C.familiar D.forced54.A.bill B.form C.ticket D.list55.A.hopefully B.disappointedly C.gratefully D.regretfully56.A.careful B.serious C.nervous D.pleasant57.A.amused B.worried C.helpless D.speechless58.A.calm B.nice C.proud D.clever59.A.forgiveness B.eagerness C.friendliness D.skillfulness60.A.explanation B.attitude C.concept D.Behavior
已知直线l为函数y＝ex图象的切线若l与函数y＝﹣x2的图象相切于点m﹣m2则实数m必定满足
已知点P是双曲线左支上一点F2是双曲线的右焦点且双曲线的一条渐近线恰是线段PF2的中垂线则该双曲线的离心率是．
某主族元素R的最高化合价与负化合价代数和为6．下列说法正确的是
Ifyoufeelstressedbyresponsibilitiesatworkyoushouldtakeastepbackandidentify识别thoseof61greatandlessimportance.Thenhandlethemostimportanttasksfirstsoyou'llfeelarealsenseof62achieve.Leavingthelessimportantthingsuntiltomorrow63beoftenacceptable.Mostofusaremorefocused64ourtasksinthemorningthanwearelaterintheday.Sogetanearlystartandtrytobeasproductive65possiblebeforelunch.Thiswillgiveyoutheconfidenceyouneedtogetyouthroughtheafternoonandgohomefeelingaccomplished.Recent66studyshowthatwearefarmoreproductiveatworkifwetakeshortbreaks67regular.Giveyourbodyandbrainarestbysteppingoutsidefor68whileexercisingordoingsomethingyouenjoy.Ifyoufindsomethingyoulovedoingoutsideoftheofficeyou'llbelesslikely69bringyourworkhome.Itcouldbeanything﹣gardeningcookingmusicsports﹣butwhateveritis70makesureit'sarelieffromdailystressratherthananotherthingtoworryabout.
若且则cos2α＝．
10分Therelationshipbetweenexerciseandcancerhaslongbothintriguedandpuzzledoncologistsandexercisephysiologists.Exerciseisstronglyassociatedwithloweredrisksformanytypesofcancer.Atthesametimeexerciseinvolvesbiologicalstresswhichtypicallyleadstoashort﹣termincreaseininflammation发炎whichcancontributetohigherrisksformanycancers.Nowanewstudyinmicemayoffersomecluesintotheexercise﹣cancerparadox.Itsuggeststhatexercisemaychangehowtheimmunesystemdealswithcancerbyboostingadrenaline肾上腺素certainimmunecellsandotherchemicalsthattogethercanreducetheseverityofcancerorfightitoffaltogether.TotrytobetterunderstandhowexercisecanbothelevateinflammationandsimultaneouslyprotectthebodyagainstcancerscientistsattheUniversityofCopenhageninDenmarkandotherinstitutionsdecidedtocloselyexaminewhathappensinsidemiceathighriskforthedisease.Soforthenewstudytheybeganbygatheringagroupofadultlabmice.Theseanimalsgenerallyliketorun.Thescientiststhenimplantedmelanoma黑素瘤skincancercellsintothemicebeforeprovidinghalfofthemwithrunningwheelsintheircageswhiletheotheranimalsremainedsedentary.Afterfourweeksfarfeweroftherunnershaddevelopedfull﹣blownmelanomathanthesedentarymiceandthosethathadbeendiagnosedwiththediseaseshowedfewerandsmallerlesions.Theydrewbloodfromboththeexercisingandsedentaryanimalsandcellsfromanytumorsinbothgroups.Asexpectedtheyfoundmuchhigherlevelsofthehormoneadrenalineinthebloodoftheexercisinganimalsespeciallyrightaftertheyhadbeenworkingoutonthewheelsbutalsoatothertimesoftheday.Thebodyreleasesadrenalineinresponsetoalmostanytypeofstressfulexperienceincludingexercise.Theyalsofoundhigherlevelsofinterleukin﹣6inthebloodoftherunners.Thisisasubstancethatisreleasedbyworkingmusclesandisbelievedtobothincreaseanddecreaseinflammationinthebodydependingonwhereandhowitgoestowork.Perhapsmostimportanttheyfoundmuchhighernumbersinthebloodstreamsofrunnersthaninthesedentarymiceofatypeofimmunecellnamednaturalkillercellsthatareknowntobestrongcancerfighters.Sothescientistsrepeatedtheiroriginalexperimentmultipletimesinducingcancerwhileallowingsomemicetorunandotherstosit.Insomeofthesefollow﹣upexperimentsthescientistsinjectedtherunnerswithasubstancethatblockedtheproductionofadrenalineandgavesedentaryanimalslargedosesofaddedadrenaline.Whattheynowfoundwasthatwhenrunningmicecouldnotproduceadrenalinetheydevelopedcanceratthesamerateasthesedentaryanimalswhilethesedentaryanimalsthathadbeeninjectedwithextraadrenalinefoughtofftheirtumorsbetterthanothersittingmice.Moreremarkablythescientistsdeterminedthatadrenalineseemedtobesendingbiochemicalsignalstosomeoftheanimals'IL﹣6cellsmakingthemphysiologicallymorealertsothatwhenatumorbegantodevelopintheaffectedanimalthoseIL﹣6cellsinturnactivatedthenaturalkillercellsinthebloodstreamandactuallydirectedthemtothetumorslikeminuteguidefish.Withtheseresults'weshowthatvoluntarywheelrunninginmicecanreducethegrowthoftumorsandwehaveidentifiedanexercise﹣dependentmobilizationofnaturalkillercellsastheunderlyingcauseofthisprotection'saidPernilleHojmanaresearcherattheUniversityofCopenhagenwhooversawthenewstudy.Itperhapsprovidesonemoreincentiveforustogetupandmove.1TherelationshipbetweenexerciseandcancerhaslongpuzzledoncologistsandexercisephysiologistsbecauseA.exerciseisstronglyassociatedwithloweredrisksformanytypesofcancer.B.exercisecanbothelevateinflammationwhichcancontributetohigherrisksformanycancersandmeanwhileprotectthebodyagainstcancer.C.exercisemaychangecanreducetheseverityofcancerorfightitoffaltogether.D.exercisecanleadtoashort﹣termincreaseininflammationwhichcancontributetoelevatedrisksformanycancers.2Inthefirstexperimentwhichoneisthemostimportantresultthescientistsfound?A.naturalkillercellsaremuchmoreinthebloodstreamsofrunnersthaninthesedentarymice.B.levelsofinterleukin﹣6arehigherinthebloodoftherunnersthaninthesedentarymice.C.exercisesuchasrunningseemedtohelpthemicefightagainstthecancer.D.adrenalinecanreducetheseverityofcancerorfightitoff.3Whatdoestheunderlinedword'sedentary'mean?A.runB.moveC.sitD.sleep4Inthefollow﹣upexperimentsthescientistsfound?A.thehormoneadrenalinehasmuchhigherlevelsinthebloodoftheexercisinganimals.B.howtheseelementsintherunners﹣theirincreasedadrenalineIL﹣6andnaturalkillerimmunecellsfightagainsttumor.C.interleukin﹣6canbothincreaseanddecreaseinflammationinthebodydependingonwhereandhowitgoestowork.D.whathappensinsidemiceathighriskforthedisease.5Accordingtothestudywecaninferthefundamentalsubstancetofightthecanceroffis.A.adrenalineB.interleukin﹣6C.naturalkillercellsD.genes
设集合A＝{124}B＝{x|x2﹣4x+m＝0}．若A∩B＝{1}则B＝
设ω＞0函数y＝sinωx++2的图象向右平移个单位后与原图象重合则ω的最小值是
某化学小组为了研究外界条件对化学反应速率的影响进行了如下实验 【实验原理】2KMnO4+5H2C2O4+3H2SO4═K2SO4+2MnSO4+10CO2↑+8H2O 【实验内容及记录】 请回答 1根据表中的实验数据可以得到的结论是． 2利用实验1中的数据计算用KMnO4表示的化学反应速率为． 3该小组同学根据经验绘制了nMn2+随时间变化的趋势如图1所示但有同学查阅已有的实验资料发现该实验过程中nMn2+随时间变化的实际趋势如图2所示． 该小组同学根据图2所示信息提出了新的假设并继续进行实验探究． ①该小组同学提出的假设是． ②请你帮助该小组同学完成实验方案并填写表中空白 ③若该小组同学提出的假设成立应观察到现象．
已知△ABC的面积是AB＝1则AC＝
AnewcollectionofphotosbringsanunsuccessfulAntarcticvoyagebacktolife.FrankHurley'spictureswouldbeoutstanding﹣﹣﹣﹣undoubtedlyfirst﹣ratephoto﹣journalism﹣﹣﹣iftheyhadbeenmadelastweek.Infacttheywereshotfrom1914through1916mostofthemafteradisastrousshipwreck海难byacameramanwhohadnoreasonableexpectationofsurvival.Manyoftheimageswerestoredinanicechestunderfreezingwaterinthedamagedwoodenship.TheshipwastheEnduranceasmalltightNorwegian﹣builtthree﹣masterthatwasintendedtotakeSirErnestShackletonandasmallcrewofseamenandscientists27meninalltothesouthernmostshoreofAntarctica'sWeddellSea.FromthatpointShackletonwantedtoforceapassagebydogsled雪橇acrossthecontinent.ThejourneywasintendedtoachievemorethanwhatCaptainRobertFalconScotthaddone.CaptainScotthadreachedtheSouthPoleearlyin1912buthaddiedwithhisfourcompanionsonthemarchback.AswriterCarolineAlexandermakesclearinherforcefulandwell﹣researchedstoryTheEnduranceadventuringwaseventhenathoroughlycommercialeffort.Scott'slastjourneycompletedasbelayinatentdyingofcoldandhungercaughttheworld'simaginationandafilmmadeinhishonordrewcrowds.ShackletonaonetimeBritishmerchant﹣navyofficerwhohadgottowithin100milesoftheSouthPolein1908startedabusinessbeforehis1914voyagetomakemoneyfrommovieandstillphotography.FrankHurleyaconfidentandgiftedAustralianphotographerwhoknewtheAntarcticwashiredtomaketheimagesmostofwhichhaveneverbeforebeenpublished.33.WhatdoweknowaboutthephotostakenbyHurley?A.TheyweremadelastweekB.TheyshowedunderseasceneriesC.TheywerefoundbyacameramanD.Theyrecordedadisastrousadventure34.WhoreachedtheSouthPolefirstaccordingtothetext?A.FrankHurleyB.ErnestShackletonC.RobertFalconScottD.CarolineAlexander35.WhatdoesAlexanderthinkwasthepurposeofthe1914voyage?A.ArtisticcreationB.ScientificresearchC.MoneymakingD.Treasurehunting.
如图所示装置工作时均与H2有关． ①图1所示装置中阳极的电极反应式为． ②图2所示装置中通入H2一极的电极反应式为． ③某同学按图3所示装置进行实验实验结束后将玻璃管内固体物质冷却后溶于稀硫酸充分反应后滴加KSCN溶液溶液不变红再滴入新制氯水溶液变为红色．该同学据此得出结论铁与水蒸气反应生成FeO和H2．该结论填“严密”或“不严密”你的理由是用离子方程式表示．
现有强酸甲溶液的pH＝1强酸乙溶液的pH＝2则酸甲与酸乙的物质的量浓度之比不可能的是
﹣﹣﹣CanIreallygetanapple6plusasarewardifIwinthecompetition? ﹣﹣﹣Absolutely!________. A.Sowillyou B.Italldepends C.Imeanit D.That'sallright
为了探究AgNO3的氧化性和热稳定性某化学兴趣小组设计了如下实验． Ⅰ．AgNO3的氧化性 将光亮的铁丝伸入AgNO3溶液中一段时间后将铁丝取出．为检验溶液中Fe的氧化产物将溶液中的Ag+除尽后进行了如下实验．可选用试剂①KSCN溶液②NaOH溶液③酸性KMnO4溶液④K3[FeCN6]溶液． 1请完成下表 【实验结论】Fe的氧化产物为Fe2+和Fe3+ Ⅱ．AgNO3的热稳定性 用如图所示的实验装置A加热固体产生红棕色气体在装置D中收集到无色气体．当反应结束以后试管中残留固体为黑色． 2装置B的作用是． 3经小组讨论并验证该无色气体为O2其操作方法是． 4[查阅资料】①Ag2O和粉末的Ag均为黑色②Ag2O可溶于氨水． 【提出假设】试管中残留的黑色固体可能是①Ag②Ag2O③Ag和Ag2O． 【实验验证】该小组为验证上述设想分别取少量黑色固体进行了如下实验 【实验评价】根据上述实验不能确定固体产物成分的实验是填实验编号． 【实验结论】根据上述实验结果得出AgNO3固体受热分解的化学方程式为． 【实验拓展】另取2.0gAgNO3样品充分受热分解共收集到标准状况下气体的体积为336mL则样品中AgNO3的百分含量为．
8分2015WasaWarmWildYear.What'sNext?2015sawthingsheatupandgetoutofhandandnotjustinpolitics.ArecordwarmDecemberraisedaveragetemperaturesenoughtomake2015thesecondhottestyearonrecordinthecontiguousUnitedStatesaccordingtotheNationalOceanicandAtmosphericAdministration'sNationalClimateMonitoringAnnualReportwhichwasreleasedThursday.TheUnitedNationshadpreviouslyreportedthat2015wasshapinguptobethewarmestyearonrecordforthewholeplanet.LastyearwasalsothethirdwettestonrecordintheU.S.andsawtenweather﹣orclimate﹣relateddisastersthateachcausedatleast﹩1billionindamageintheU.S.andkilledatotalof155people.Theseincludeadroughttwofloodsfiveseverestormsawildfireandawinterstorm.TheaverageU.S.temperaturewas54.4°F2.4°Fabovethe20thcenturyaverageandsecondonlyto2012'srecordwarmth.Thiswasalsothe19thconsecutiveyearwithaveragetemperaturesabovetheaverageforthecentury.Everystatereportedabove﹣averageannualtemperatures.ThewarmingwasparticularlypronouncedacrossmostoftheeasternhalfofthecountryinDecemberwhenmanyplacessawtemperatures30degreesabovenormalandmanyrecordswereset.ThismirroredchangesseenintheArcticthatmonthwhentemperaturesspikedto50degreesabovenormal.PartofthiswarmingwasdrivenbyastrongElNiñoorperiodicwarminginthePacificOceanbutsomeofitcanalsobeattributedtoglobalwarmingsaysmeteorologistEricHolthauswhowasnotinvolvedwiththefederalreport.TheanalysiscomeslessthanamonthaftertheU.S.and194othercountriessignedanagreementinParistomoreaggressivelycountertheeffectsofclimatechange.'EvenifalltheinitialtargetsinParisaremetwe'llonlybepartofthewaytherewhenitcomestoreducingcarbonfromtheatmosphere'saidPresidentBarackObamaatthetime.Stilltheagreementrepresented'aturningpoint'bysettingup'thearchitecture'fordoingsohesaid.NOAA'sclimatemonitoringcenterdoesn'tissuepredictionsforfutureweatherbuttheagency'sClimatePredictionCenterdoes.Thatteam'sforecastforthenextthreemonthscallsforwarmer﹣than﹣averagetemperaturesinmuchofthecountryalthoughpartsofTexasandtheSoutheastmaybealittlecoolerthanusual.AsLancasterUniversityProfessorGailWhitemantoldtheWeatherChannel'climatechangemeansextremeweatheristhenewnormal.'1AccordingtothepassagethewarmestyearintheU.S.isA.2014B.2015C.notmentionedD.20122Accordingtothepassagewhichstatementisright?A.2015wasthethirdwettestyearonrecordinthewholeplanet.B.Tenweather﹣orclimate﹣relateddisastersintheU.S.includeadroughttwofloodsfourseverestormstwowildfiresandawinterstorm.C.The20thcenturyaveragetemperatureintheU.S.was52°F.D.ThewarmingwaspronouncedacrossmostofthewesternhalfofthecountryinDecember.3TheagreementtheUS.and194countriessignedaimedtoA.reducecarbonfromtheatmosphereB.countereffectsofclimatechange.C.setupthearchitectureD.findartificialwaystocooldowntheextremeweather4WhatdoesProfessorGailWhitemanmeaninthefuture?A.Extremeweatherwillbecommoninthefuture.B.Climatechangewillbenormal.C.Extremeweatherwillbenormalifwedon'ttakemeasures.D.Climatechangeleadtoextremeweather.
2017年5月14日第一届“一带一路”国际高峰论坛在北京举行为了解不同年龄的人对“一带一路”关注程度某机构随机抽取了年龄在15﹣75岁之间的100人进行调查经统计“青少年”与“中老年”的人数之比为911． 1根据已知条件完成上面的2×2列联表并判断能否有99%的把握认为关注“一带一路”是否和年龄段有关 2现从抽取的青少年中采用分层抽样的办法选取9人进行问卷调查．在这9人中再选取3人进行面对面询问记选取的3人中关注“一带一路”的人数为X求X的分布列及数学期望． 附参考公式其中n＝a+b+c+d 临界值表
热门题库
更多
高三上学期物理
高三上学期生物
高三上学期化学
高二下学期化学
高二下学期生物
高三下学期生物
高三下学期化学
高三上学期英语
高二下学期英语
教案备课库
高三下学期英语
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
湘公网安备 43130202000226号