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如图所示，粗细均匀的U形管中，封闭了有两段水银柱和两部分空气柱，水银柱A的长度h1＝25cm，位于左侧封闭端的顶部．水银柱B与A之间的空气柱长度L1＝12.5cm，右侧被活塞C封闭的空气柱长度L2＝...
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高三下学期物理《》真题及答案
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如图3所示两端封闭粗细均匀竖直放置的玻璃管内有一长为h的水银柱将管内气体分为两部分已知l2=2l1.
两端封闭的U形管竖直放置管内左右两段空气柱A和B被底部水银柱隔开如图1所示.设原来的温度为T当温度升
如图所示粗细均匀上端封闭的三通细玻璃管中用水银与活塞封闭了两段温度相同长度分别为lA=25cm和lB
如图所示粗细均匀丙端开口的U.形管竖直放置两管的竖直部分高度为20cm内径很小水平部分BC长14cm
如图所示两端封闭的玻璃管中间有一段水银柱经适当倾斜上下两部分气体的体积恰好相等保持玻璃管位置不变管内
如图所示两端封闭粗细均匀的竖直放置的细玻璃管中间用长为h的水银柱将空气柱分为两部分两段空气柱长度分
水银柱上升
水银柱下降
水银柱不动
无法确定
如图所示玻璃管粗细均匀粗细可忽略不计竖直管两封闭端内理想气体长分别为上端30cm下端27cm中间水银
如图所示粗细均匀的U形玻璃管竖直放置左管上端封闭封口处有一段水银柱1右管上端开口且足够长另有两段水
如右图所示玻璃管粗细均匀粗细可忽略不计竖直管两封闭端内理想气体长分别为上端30cm下端27cm中间水
如图所示粗细均匀的U.形管左端封闭O.处由橡皮软管连接左右两端竖直管内有高为19cm的水银柱封住两部
如图所示粗细均匀的U形玻璃管竖直放置左管上端封闭封口处有一段水银柱1右管上端开口且足够长另有两段水
如图所示粗细均匀的U.形管竖直放置管内有水银柱封住一段空气柱如果沿虚线所示的位置把开口一侧的部分截掉
体积不变
体积变大
压强变大
压强不变
如图所示粗细均匀丙端开口的U.形管竖直放置两管的竖直部分高度为20cm内径很小水平部分BC长14cm
如图所示两端封闭的粗细均匀的U形管中封闭了一段水银柱U形管左右两端各有一段空气柱.U形管由静止自由下
如图所示粗细均匀的U.形管竖直放置管内由水银柱封住一段空气柱.如果沿虚线所示的位置把开口一侧的部分截
体积变小；
体积变大；
压强变小；
压强不变。
如图所示粗细均匀的U形管中封闭了有两段水银柱和两部分空气柱水银柱A的长度h1＝25cm位于左侧封闭
在图1所示的两端封闭水平放置的粗细均匀玻璃管中水银柱将气体隔成了体积不同的左右两部分.初温T左＞T右
如图所示粗细均匀的U形管中封闭了有两段水银柱和两部分空气柱水银柱A的长度h1＝25cm位于左侧封闭
如图所示U.形管两臂竖直固定右管中一段水银柱
与管底部水银间有一段空气柱
被封于右臂管子的中部，A.部分水银在水平管中，设U.形管内粗细均匀，两端均开口与大气相通，现再向左管注入少量水银，温度保持不变，等平衡后可知 [ ] A.空气柱B.的压强增大 B.空气柱B.的长度不变
图中h减小
图中h不变
一端封闭的粗细均匀的玻璃管开口向上竖直放置管内有甲乙两段水银柱封闭的
B.两部分气体，水银柱甲的底部是一只很薄的活塞丙（活塞重力不计），活塞被管内壁上的小突起物支持着，只能无摩擦地向上运动。已知大气压强为75cmHg，且A.中气体压强也是75cmHg，两段空气柱温度都是127℃，其余尺寸如图所示。现保持A.中气体温度不变，而使
中气体温度升高。当水银柱甲开始向上移动时，B.中气体温度升高了 （ ） （A.）80K （B.）60K （
）50K （
）30K
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为做好达州市渠江航道升级的前期工作四川省交通运输厅交通勘察设计院组织专家到渠江现场踏勘现要测量渠江某处BA两岸的距离如图在B的正东方向选取一点C测得CB＝2kmA位于C西偏北60°A位于B北偏东15°则BA的距离＝
已知命题命题q若a＜b则则下列为真命题的是
已知点Ab是函数fx＝sinπ•x+φ+b0＜φ＜πb＞0图象上一点点A到直线14x+3y＝0的距离为1．1求函数fx的解析式2令S＝f+f+f++f求S的值．
九连环是我国古老的一种智力游戏它环环相扣趣味无穷九连环由九个大小相同的圆环依次排开镶在铁丝框架上．玩九连环就是将九连环按照一定规则从框架上解下或套上．用Kn表示解下n个圆环所需移动的最少次数已知K1＝1K2＝2通过规则可知Kn＝Kn﹣2+2n﹣11≤n≤9n∈N则K5＝．
已知向量⊥||＝1则|+|＝
Peoplebecomeaddictedtomanythings.Someofthesemaybedrugsalcoholandsmokingbutalsoelectronics.Electronicsgetyouaddictednotbecauseofdrugslikenicotinebutbecauseofsomethingcalleddopamine多巴胺. Dopamineisachemicalnaturallyproducedinthebodythathelpscontrolthebrain'srewardandpleasurecenters.Itisreleasedwhenyouwinsomething.Younotonlygetdopaminefromwinningsportslikefootballortennisbutalsogetasmallamountofdopaminewhenyouhearanotificationfromyourdevicewinsomethinginavideogameorevensimplysurfthewebonyoursmartphone.Yourbodylovesthefeelofdopamineandtriestofindmorewaystogetitwithlesseffortwhichcanleadtoaddictiontoelectronics. Webecomeaddictedtovariouselectronics.Butamongallofthemphonesmaynotdotoomuchharmtousphysically.It'sdevicessuchastelevisionsandcomputersthatcauseyoutositfortoolongwithoutstretchingormovingwhichcanresultinaconditionknownasdeepveinthrombosis深静脉血栓.Itcancauseseriousdamagetoourhealth. Howeverwecantrytobreakawayfromaddiction.Wecanmakeaccesstoourdevicesalittlemoredifficultwhichcandiminishthechancesofusactuallywantingtogoanddothatspecificthing.Forexampleifyouknowyoufrequentlyuseanapponyoursmartphoneyoucanputtheappincertainfarcornerofyourphonethereforeitwouldtakeyoualittleextratimetogettoitinsteadofjustturningthephoneonandhavingdirectaccesstoit.Besideswecanpreventphysicalproblemsbyusingastandingdesk.Thisisbasicallyadeskbutyouhavetostandatitinsteadofsittingonit.Thiscanpreventawiderangeofphysicalproblemsincludingobesitylowerriskofheartdiseaseandsoon. Allinallelectronicsprobablyalreadyhaveyouaddicted.Thankfullytherearewaysyoucangetoutofthisaddiction.It'snotalostcauseandyoucanstillgetyourselfhealthyandoutofaddiction. 1Whenweplaywithelectronicsthedopamineproducedinthebody. A.isbadforourmentalhealth B.causesaddictiontoelectronics C.increasesthechanceofwinning D.isinchargeofourbrain'sactivities 2WecaninferfromParagraph3thatphones. A.areharmlesstoourphysicalhealth B.dogreatharmtoourmentalhealth C.arenomoreaddictivethanotherdevices D.don'tharmourbodyasmuchasotherdevices 3WhatdoestheunderlinedworddiminishinParagraph4mean? A.Reduce. B.Ruin. C.Access. D.Seize. 4WhatdoestheauthorintendtodoinParagraph4? A.Advertiseanewstandingdesk. B.Callonpeoplenottouseelectronics. C.Advisepeopletousetheirappswisely. D.Providewaysofgettingridofaddictiontoelectronics.
在△ABC中sinAsinBsinC成等差数列sinC﹣+sinC+＝sin2C且＝32则|AB|＝
Awomanprofessorwalkedaroundinaclassroomwhileshewasteachingstressmanagementtoherstudents.1sheraisedaglassofwater2expectedtheywouldbeaskedthehalf﹣emptyorhalf﹣fullquestion. Insteadwitha3onherfacesheaskedWhat'sthe4ofthisglassofwater? 5calledoutrangedfromeighttotwentyounces盎司. She6thestudentsdownandthenrepliedTheabsoluteweightdoesn'tmatter.Itall7howlongIholdit.IfIholditforaminuteit'snotaproblem.IfIholditforanhourI'llhavea8inmyarm.IfIholditforadaymyarmwillfeelnumb麻木andparalyzed麻痹.Ineach9theweightoftheglassofwaterdoesn'tchangebutthelongerIholditthe10itbecomes.Doyouknowwhy? Allthestudentskeptsilentandlistenedcarefullylostinthought. She11Ourand12inlifearelikethatglassofwater.Thinkaboutthemforawhileandnothing13.Thinkaboutthemabitlongerandtheybegintohurt.Andifyouthinkaboutthemalldaylongyouwillfeel14unabletodoanything. It'simportantto15toletgoofyourstresses.Asearlyintheeveningaspossibleputallyourburdensdown.Don't16themthroughtheeveningandintothenightRemembertoputtheglassdown! Moreoftenthannotlifegets17whenwethinktoomuch.Andthemomentyou18yourburdenyou'llfindyourselffeelingsomuchmorerelaxed. So19wonderingaroundandfeelingsorryforyourselfstartdoingsomethingaboutit.Afteralllifeistooshorttodevoteyourselftoanythingthatmakesyou20. 1A.If B.As C.However D.Though 2A.everyone B.nobody C.someone D.anyone 3A.look B.puzzlement C.smile D.surprise 4A.quality B.weight C.amount D.problem 5A.solutions B.numbers C.methods D.answers 6A.quieted B.stopped C.signed D.signaled 7A.decidedon B.dependson C.resultedfrom D.resultedin 8A.cut B.problem C.danger D.pain 9A.glass B.way C.case D.manner 10A.moreserious B.more C.harder D.heavier 11A.continued B.explained C.commented D.replied 12A.worries B.anger C.discomfort D.problem 13A.matters B.helps C.happens D.works 14A.shocked B.dissatisfied C.angry D.discouraged 15A.come B.remember C.realize D.believe 16A.get B.carry C.put D.take 17A.exciting B.frightening C.terrible D.colorful 18A.undertake B.refuse C.remove D.change 19A.ratherthan B.morethan C.besides D.Asto 20A.relaxed B.unsure C.excited D.unhappy
Becominganeffectiveandefficientstudentisnotsomethingthathappensovernightbutputtingafewofthesetipsintodailypracticecanhelpyougetmoreoutofyourstudytime. Focusonlearninginmorethanoneway.Insteadofjustlisteningtoapodcastwhichinvolvesauditory听觉的learningfindawaytorepeattheinformationbothverbally口头地andvisually.Youcandescribewhatyoulearnedtoyourfriend.1. Teachwhatyou'velearnedtoanotherperson.Startbytranslatingtheinformationintoyourownwords.2.Someideasincludewritingablogpostcreatingapodcastorparticipatinginagroupdiscussion. Gainpracticalexperience.Ifyouaretryingtoacquireanewskillorabilityfocusongainingpracticalexperience.3.Ifyouarelearninganewlanguagepracticespeakingwithanotherpersonandsurroundyourselfwithlanguage﹣immersionexperiences. 4.Weknowlearningisn'taperfectprocess.Sometimesweforgetthedetailsofthingsthatwehavealreadylearned.Ifyoufindyourselfstrugglingtorecallsomeinformationresearchshowsthatyou'dbettersimplylookupthecorrectanswerbecausethatrecallingmayresultinlearningtheerrorstateinsteadofthecorrectresponse. Understandhowyoulearnbest.Anothergreatstrategyforimprovingyourlearningefficiencyistorecognizeyourlearninghabitsandstyles.5.Thenyourlearningefficiencycanbeimprovedgreatly. A.Recallingresultsinthewronganswer. B.Lookupanswersratherthanstruggletoremember C.Nextfindsomewaystosharewhatyou'velearned. D.Youcanapplyitbysharingyournewlylearnedskills. E.Ifitisasportofathleticskillperformtheactivityregularly. F.Thathelpsyougainabetterunderstandingofhowyoulearnbest. G.Intheprocessyoucanmaketheknowledgemorepermanentinyourmind.
过抛物线Cy2＝4x的焦点F作互相垂直的弦ABCD则四边形ACBD面积的最小值为．
假定你是李华你看到悦读网Enjoyreading正在举行百日阅读汉语经典活动要求参加者在网上连续阅读一百天每天至少半小时完成后该网站免费赠送书籍.请给你的留学生朋友Henry写封邮件推荐该活动.内容包括 1.介绍该活动 2.推荐该活动 3.推荐理由至少两条. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
如图等腰梯形ABCD中AB∥CDAC与BD交于点O∠DAB＝45°若AB＝3CD＝6则以下所有结论中正确的序号是． ①若＝则μ＝3λ ②三角形AOB的面积为4 ③＝＝ ④若MN是直线BC上的动点•＝24
Lionstigersandotheranimalsarestayingawakeatnight1avoidhumanbeingsanewstudyfinds. Scientistshaveknown2humanactivitiescanleadtochangesinnature.Manyanimalsmaymovearoundlessortraveltofarplacestokeepaway3people.Byawakingatnightanimalscanalsobeonguardagainstpossibleenemiesandspendlesstime4lookforfood. Thelatestresearchfoundthatevenactivitieslikefarmingandcampingcan5frightanimalsandcausethemtobecomemoreactiveatnight.Researcherscompared6carefulhowmuchtimethoseanimalswereactiveatnightinareasofhumanactivitiessuchashuntingandfarming.7washumanactivitiesthatcausedanincreaseofabout20percentinnight﹣timeactivitiesevenincreaturesthatusuallysleepatnight.Results8publishinthejournalSCIENCEtwomonthsago. Thenewfindingsare9usualbecausenooneelsehaslookedatitinsuchdetailbefore.EcologistMarleeTuckerwas10surprisethatanykindofhumanactivitiesisenoughforanimalstoseepeopleasathreat.
某单位有7个连在一起的车位现有3辆不同型号的车需停放如果要求剩余的4个车位中恰好有3个连在一起则不同的停放方法的种数为
PracticalWaystoShowRespectforaFriend ●Showrespectfortheirlifechoicesanddecisions 1.Theywillmakedifferentlifechoiceshavedifferentviewsonpoliticsandreligionandactdifferentlyinmanyways.Thisdoesn'tmeantheycan'tbeyourfriend.Itmeansthatyou'llneedtotakeastepbackreservejudgmentandshowrespect. ●Givethemthebenefitofthedoubt Assumptions猜疑canbeadangerousthing.2.Berespectfulandgivethemthebenefitofthedoubtwhenyoudon'tdo.Thisalonewillhelpyoustayintheirgoodgraces好感. ●Givefriendsyourfullattention Oneofthebestwaystoshowrespectforsomeoneistolistentothemfully.Allowthemtopauseconveynonverbalcommunicationcluescollecttheirthoughtsandgetitallout.Toooftenfriendslistenwithhalfanearorjumpintheminutetheirfriendpauseswithanevenworsestory3.Whenyourfriendistalkingpayattention. ●4 Treatyourfriendsrespectfullywhenyouarguewiththem.Makeyourfriendshipasafeplacebynotembarrassingyourfriendorexpressingyourprivatedisagreementsinfrontofotherpeople.Bepubliclysupportiveandkindtoyourfriendssotheyknowyouvalueyourfriendshipwiththem. ●Showupbethereanddowhatyousayyou'regoingtodo 5.Sojustshowyourfriendthebestkindofrespectbybeingontimekeepingpromisesandbeingtheonefriendtheycanalwayscounton.That'sthewaytotrulyshowrespect. A.Acceptthatpeoplearen'talwaysgoingtobejustlikeyou. B.Noonelikesanunreliablefriendwhosaysthey'llbethereandthendoesn'tshow. C.Tellyourfriendswhatyouthinkaboutthemdirectly. D.Thistypeofbehaviorisverydisrespectful. E.Infactyoucandoeverythingbutacceptthedifferences. F.Ifyou'reindoubtaboutsomethingaskyourfriend. G.Consideryourfriendshipapreciousgift.
已知Sn是数列{an}前n项和点anSn+2n+1n∈N*在直线2x﹣y＝0上令bn＝cn＝1． 1求a1的值 2求证数列{bn}是等差数列 3对任意的pq∈N*若λ≥|cp﹣cq|恒成立求实数λ的取值范围．
ToeducateagirlistoeducateathousandpeoplesaysMaimounaSamakéamotherofsixchildrenincludingfivegirls.Ifyouputoneseedinthegroundandraincomesitwillgrowtoproducemanyseeds. Samakéoneof2000residentslivesinasmallvillageSounkalainoneoftheworld'spoorestcountries.NowshehasachancetoseethiswishcometruethankstoBuildOnanAmericannon﹣profitorganizationthatisbuildingaschoolinhercommunity. For17yearsBuildOnhasbeensendingAmericanhighschoolstudentsoverseastocreateschoolsinplaceswhereliteracy文化andformaleducationareusuallyoutofreach.Theorganizationhasbuiltabout300schoolsinMaliMalawiNepalSenegalNicaraguaandHaiti.ItsgoalistogetyoungAmericansinmostlyurbanareastogetinvolvedineducation.Atthesametimeitcanbringliteracytochildrenandadultsinpoorvillagesinthedevelopingworld. Sounkala'scurrentschoolonlyhasabout70childrenmudfloorspoorlightingfewdesksandanabsenceofbooksmeanthattheschoolisnotthemostideallearningenvironment.ThereforetheycertainlycoulduseBuildOn'shelp. Samakéhasn'tbeentoschoolbutshewantsabetterfutureforherfivedaughtersincludingRamatou12andMariam10.WhenawomanattendsschoolshewillteachwhatshelearnstoherchildrensaidRamatouwhowantstobecomeadoctor.Shewillalsoknowhowtotakebettercareofherfamily. BuildOntriestobuildschoolsforgradesonetothree.Ifthingsgowelloverthosethreeyearstheyreturntohelpbuildanotherschoolforgradesfourtosixandthensetupeveningadultliteracyclasses. RamatouandMariamwillnotlearninsidethewallsofBuildOnschoolsincetheyarealreadyinthesixthgradebutSamakéhopesthattheywillbeabletoattendeveningclassestocontinuelearning. 1WhichofthefollowingaspectsofBuildOnisNOTmentionedinthetext? A.Itssourcesoffunding. B.Itshistory. C.Itsgoal. D.Itsapproach 2AccordingtothetextWhatkindofschoolisBuildOnmostlikelytohelp? A.inavillageinadevelopedcountry B.inanurbanareainadevelopingcountry C.inaruralareainadevelopingcountry D.inanearthquake﹣strickenareainadevelopedcountry 3WhatdoweknowaboutSamakéandherfamily? A.Mariamisinthesixthgrade. B.Samakéiswell﹣educated. C.Ramatouisadoctor. D.Samakéonlyhasdaughters. 4What'sthemainideaofthepassage? A.Awoman'sdreamofgoingtoschool. B.People'seducationconditionsinpoorareas C.BuildOn'sgreatcontributionstoeducationandlife. D.Anorganizationthathelpsbuildschoolsforpeopleinpoorareas
Drinkingwaterisoneofthefavorsyoucandotoyourbody.Ithassurprisinghealthbenefitssuchasmakingyou1energyandhappy.Thereisalonglistof2reasonwhywatershouldbeamustinyourdiet. Ifyouarelookingforaproductthathelpsyourecoverandbecomeyoungerwaterisagood3choose.Itcanhelpyourskinrecoverfasterafterbeinginjured.Hotwaterevenhelpsyourskinbecomesmooth. Wateris4keepsthefoodmovingdownthroughyourbody.Ifthereisnotenoughwaterinthebodyit'llbetoohardforthefood5passthroughthebody.Warmwaterhelpsbreakdownfoodfasterandcan6effectiverelieveyourskin.Accordingtoastudydrinkingtwocupsofwaterwillincrease7speedofdigesting8about30%.Thisincludeswarmwaterwhichincreasesyourbodytemperaturesothefoodcan9digestfaster. Hotwatercanalsoplayarolein10cleanyourskinsoinawayitisanaturalskincareproduct.Fewerharmfulbacteriaintheskinmeanasmallerriskofsufferingskindiseases.
已知函数fx＝xlnx﹣2ax2+xa∈R． Ⅰ若fx在0+∞内单调递减求实数a的取值范围 Ⅱ若函数fx有两个极值点分别为x1x2证明x1+x2＞．
Lookingforsomeplacesoutofthisworldtovisitonvacation?Herearefourcoolplacestovisit. KennedySpaceCenterVisitorComplex LocatedintheeastofOrlandoFloridait'sconsideredasthegreatestspaceadventureonEarth.Youcanmeetastronautseatspacefoodwatchmoviesaboutpastspacemissionsandifyou'reluckygettowatchanewlaunchdependingonthespaceprogram'sschedule.Remembertotakeenoughmoneyforadmissionandvarioussouvenirsintheworld'slargeststoredevotedtospacesouvenirsandNASAclothingandequipmentwhichmightcostafortune. AmericanMuseumofNaturalHistory It'sanimportantscientificandculturalinstitutionwithextremelyimpressiveexhibitionsandcollectionsabouthumanculturesthenaturalworldandtheuniverse.Themuseumlookslikeahugeglassboxwithahugeglobeenclosedwhichisquiteattractivetopeople.ItcontainsspaceandastronomyexhibitsamodelsolarsystemandthebeautifulHaydenPlanetarium天文馆. NewMexicoMuseumofSpaceHistory NobodywouldexpectsuchacoolspacemuseuminthedesertnearWhiteSandsNewMexicobutinfactthereisone!Thismuseumrecordsthearea'sspacehistory.Admissionticketsareavailableonthewebsiteanditoffersdiscountsforseniorcitizensandyoungstersunderage12. LowellObservatory TheLowellObservatorylocatedonMarsHilloverlookingFlagstaffwasbuiltinthelate1800sbyMassachusettsastronomyenthusiastPercivalLowelltohelphimstudyMars.VisitorstoLowellObservatorycanseethedomevisitClydeTombaugh'stombtaketoursandparticipateinastronomycamps.Theobservatoryisatanaltitudeofabout7200feetsobringsunscreendrinklotsofwaterandtakefrequentbreaks. 1WhatwillyouprobablyfaceinKennedySpaceCenterVisitorComplex? A.Riskysurrounding. B.Adventurousastronomycamps. C.Terriblespacefood. D.Relativelyhighconsumption. 2WhatisspecialaboutNewMexicoMuseumofSpaceHistory? A.Itssize. B.Itshistory. C.Itslocation. D.Itsbudget. 3Wherearevisitorsadvisedtohavemorerest? A.InKennedySpaceCenterVisitorComplex. B.InAmericanMuseumofNaturalHistory. C.InNewMexicoMuseumofSpaceHistory. D.InLowellObservatory.
Foodisnecessaryforofferingenergytoourbodiesbutsometimeswebuytoomuchofitatthestore.Whenyourfoodstartstogobadtherearemanyotherwaysyoucanstillmakeuseofitinsteadofthrowingitaway. Beforethrowingawayoldbananasyoucanusethepeels皮toshineupmetalsandleathers.Pressthepeelagainstthesurfacemoveitbackwardsandforwardsandthenpolishcleanitwithanoldcloth.Bananameatisalsogoodforreducingwrinkles.Putabitonthosetroublespotsletitsitforawhileandthenwashitoffandyourwrinkleswillgoaway.Lemonsaregreatforlighteningskinandhair.Ifyouhavetroublewithsomeskindiseaseslikeredspotsonyourfaceputabitoffreshlemonjuiceonthemandleaveitovernight.You'llnoticeadifferenceinthemorning.Appleswillhelpripen使成熟tomatoesquicklywhentheyareplacedtogetherinapaperbagandorangepeelsaregreatfirestartersforyournextbackyardcampfireparty. Ifyourdogorcatbringshomefleasusingsaltisagreatwaytogetridofthemaroundthehouse.Justpoursaltintothevacuumcleaner真空吸尘器.Letitsitthenvacuumupthefleas.Thesaltcankillthefleas.Besuretothrowawaythevacuumbagoremptythevacuumbinimmediatelyorsomeofthefleascanclimbout. Beerisagreathairlightener.Ifyouareoutoflemonstrydippingyourhairinbeerbeforegoingoutside.Justdon'tforgettowashitoutafterwards.Milkisgreatforremovingdirtymarksespeciallyifitissometypeofink. Asyoucanseetherearemanyotherusesforeverydayfoodsaroundthehouse.Sonexttimebeforethrowingfoodawaythinkingitisofnousestopforamomentandthinkaboutalltheirusestalkedabouthere. 1Howmanywayswemakeusefruitaretalkedaboutinthepassage? A.3 B.4 C.5 D.6 2WhichoftheAllowingcanbeusedtolightenyourhair? A.Lemonsandbeer. B.Bananasandlemon. C.Orangesandbeer D.Milkandlemon. 3WhatdoestheunderlinedwordtheyinParagraphsreferto? A.Apples B.Tomatoes C.Applestomatoesandapaperbag D.Applesandtomatoes. 4What'sthewriterattitudetosurprisinguseofeverydayfood? A.Negative B.Positive C.Concerned D.Careful
已知实数xyz则下列命题正确的是
Myelephantadventuresbeganin1984whenwithourone﹣year﹣olddaughtermyhusbandandIcrossedthejungleinajeepslickingbehindalorryforcomfortandcompany.Theelephantsstandinglikewatchersoneithersideoftheforesthighwayhadusprayingforoursafety.Oneelephantmadeloudnoiseandangrilypawed抓thegroundwarningusoff.Weracedawaybeforetheycouldattack. Itwaswisetokeepelephantsatadistance.Weheardstoriesoftouristswhosejeepswereoverturnedandacoupleofphotographerswerekilledbecausetheymovedtooclose.Elephantsaremisleadinganimals.Theygivepeopleanimpressionofbeingquietandkindsotouriststhinkit'ssafetopicnicinthejungle丛林.Yetangryelephantshaveknockedthemdowninsecondsbeforetheycouldtakeoff. Elephantsmightmakelifeunpredictableanddangerous.It'sdifficultforinexperiencedenvironmentaliststoevenbegintograspthisreality.I'veheardcitypeoplesayWehumansareencroaching侵害ontheirforests.Butwhat'sthesolution? Whenapoorfarmerborrowsheavilytoplantacrophe'lldoanythingtoprotectitHislifedependsonitElephantsruininganabout﹣to﹣be﹣harvestedcomfieldcannotexpecttobewelcomedlikespecialguests.Thebattlebetweenbeastandfarmerisviolent. Expertsareworkingonsolutionstohuman﹣elephantconflicts冲突.Somearesuretofailtoliketheplanstobuildelectricfencesaroundhumansettlements.Elephantsrapidlyfigurethemoutandcomeinaroundandoverthem. Therearemorequestionsthananswersforsure.ButasmyhusbandsaidMorepeopledieincaraccidentseverysingledayineverycityontheearth.Buttheywon'ttakecarsofftheroadswillthey?Soweneedtoseekpracticalwaysofpreventingelephantaccidents. 1Whatisthewriter'spurposeinwritingParagraph1? A.Totellreadersherfamily'sexperienceofelephantadventure. B.Toshowreaderselephantsareangryanddangerous C.Tointroducethetopicofthewholepassage. D.Todescribehowherfamilykeepawayfromelephants. 2Whydotouriststhinkitissafetopicnicinthejungle? A.Theythinkelephantsarequietandkind. B.Theyhaven'theardthestoriesofelephantkillingpeople. C.Theylikeelephantstoomuch. D.Theythinktheycanraceawayinseconds. 3Whatdocsapoorfarmerdotoprotecthiscrop? A.Welcomeelephantlikespecialguests. B.Fightwithelephantsforhisharvest. C.Stopplantingcrops. D.Dependonelephantsforhislife. 4Whatcanwelearnfromthelasttwoparagraphs? A.Itisagoodideatobuildelectricfencesaroundhumansettlements. B.Itisimpossibletofindasolutiontosettlehuman﹣elephantconflict. C.Weshouldfirstreducecaraccidentstopreventelephantaccidents. D.Itisourdulytoprotectelephantsratherthankillthem.
已知定义在R上的函数gx其导函数为g'x若gx＝g﹣x+x3+x且当x≥0时g'x＜则不等式2gx﹣2gx﹣1＞3x2﹣3x+2的解集为
ABC是平面内的三点已知A﹣21B23AC的中点M在y轴上BC的中点N在x轴上． 1求点C的坐标 2求过点M且垂直MN的直线l的方程一般式方程．
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∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改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. Ihavereceivedandreadyourletterinwhichyoumentionthatyouwantedtoloseweightbydiet. Itisonlynaturallythatyounggirlsatyouragehopetolookbeautiful.Howeverinmyopinionhealthyismoreimportantthanbeauty.Forastudentstudyingisthefirstthingtoconsiderwhileappearanceissecond.Sodonotletothers'opinionstoaffectyournormallife.Thereforeifyoudowanttoloseweightitisagoodideatodoitbygettingmoreexerciseandchangingunhealthyeatinghabits.Themostimportantthingishowyoukeepahealthystateofmindasitwillhelpwithourstudiesandwillalsohelpyouovercomedifficultiesindieting. IhopemyadviceswillbehelpfultoyouandI'mlookingforwardtoyournextletter.
已知直线4x+m2y﹣m＝0m＞0若此直线在x轴y轴的截距的和取得最小时则直线的方程为
直线l1y＝x+1中若l1l2关于x轴对称则l2的倾斜角
近年来国资委党委高度重视扶贫开发工作坚决贯彻落实中央扶贫工作重大决策部署在各个贫困县全力推进定点扶贫各项工作取得了积极成效某贫困县为了响应国家精准扶贫的号召特地承包了一块土地已知土地的使用面积以及相应的管理时间的关系如表所示 并调查了某村300名村民参与管理的意愿得到的部分数据如下表所示 1求出相关系数r的大小并判断管理时间y与土地使用面积x是否线性相关 2是否有99.9%的把握认为村民的性别与参与管理的意愿具有相关性 3若以该村的村民的性别与参与管理意愿的情况估计贫困县的情况则从该贫困县中任取3人记取到不愿意参与管理的男性村民的人数为x求x的分布列及数学期望． 参考公式 其中n＝a+b+c+d ．临界值表 参考数据≈25.2
假定你是李华你的朋友Peter想了解你校于五月举办的中国传统文化艺术节.请你给Peter写封回信内容包括 1.举办艺术节的目的 2.介绍你最喜欢的一个艺术节活动 3.邀请Peter参加并告之艺术节活动的时间. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
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