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解不等式组，并将解集在数轴上表示出来．
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解不等式组并将解集在数轴上表示出来.
解下列不等式或不等式组并将解集在数轴上表示出来..
解不等式组把解集在数轴上表示出来并将解集中的整数解写出来.
解下列不等式或不等式组并将它们的解集表示在数轴上.解不等式组并把其解集在数轴上表示出来:
解不等式组并将解集在数轴上表示出来.
解不等式组并将解集在数轴上表示出来.
解不等式组并将解集在数轴上表示出来.
解不等式组并将它的解集在数轴上表示出来
解不等式组并将解集在数轴上表示出来:
解不等式组并把不等式组的解集在数轴上表示出来7x－2≥5x＋2
解下列不等式或不等式组并将解集在数轴上表示出来.4x+5≤6x﹣3.
解不等式组并将解集在数轴上表示出来.
解不等式组并将解集在数轴上表示出来.
解不等式组并求其整解数并将解集在数轴上表示出来.
解不等式组并将解集在数轴上表示出来.
解不等式组并将解集在数轴上表示出来.
解不等式组并将解集在数轴上表示出来.
解不等式组并把它的解集在数轴上表示出来.
解不等式组并将解集在数轴上表示出来.
解不等式组并将它的解集在数轴上表示出来.
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下列实验方案不合理的是
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10分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. Onasnowywinternightabuswith45passengerhadanaccidentbecauseofthewetroad.Andallofthemweretrappinginthebusandwhatwasworsethebusranoutgasanditwasverycoldinit.Theycoulddonothingbuttowait.Amanlivednearbysawwhathadhappened.Heandsomevillagersmanagedtoopenthedoorandhelpedallofthemoutofabus.Thenhetookustohishomebutofferedfoodandwaterandevensomewarmclothestothechildren.Theyspenttwodaysinhishomeandhelpcamefinal.Allofthemarethankfultohimforwhathedid.
8分TodayismyfirstdayatMerchistonCastleSchoolandIwasreallynervousaboutitbecauseIhavenevervisitedtheschoolbeforeanddidn'ttakeanysummercourse.DespitemyanxietyIsoonrelaxedonceIarrivedthestaffweresonicethatIfeltmyspokenEnglishwasbetterthanitactuallywas!AssoonasIwalkedintothedayroomofmyboardinghouseIwasabsolutely完全地amazedbythefriendlyatmosphereeveryonewassofriendlythataboyasshyasIhadnodifficultyinsettinginandImademanynewfriendsonmyveryfirstdayalthoughIwasstrugglingtorememberallthenames. AlsoIrealizedtherewereotherinternationalstudentsinthehousefromallovertheworldsuchasSouthKoreaJapanandRussia.AlthoughtheirEnglishwasnotsofluentitdidn'ttakelongforustounderstandeachotheratall.InsomewaysitwasevenbettertopracticeEnglishbyspeakingtotheinternationalstudentsbecausewewerebothlearning. AsaboarderthequalityoffoodissomethingIconsiderveryimportantandMerchistonhasnotletmedown.Theschoolkitchensarerunbyaprofessionalcateringcompanyandthequalityoffoodisexcellent.Alsotheytaketheissueofahealthydietreallyseriously.IrememberonceIwasaskedtotakemoresaladformymealbyamemberofthekitchenstaffforIdidnothaveenoughvegetables.Thisbringstoanotherpointofbeingaboarderyouneedtolearnhowtolookafteryourselfandberesponsibleforyourself.Oneofthehugeadvantagesofbeingaboarderisthatwecanhavebreakfastintheschoolwhichmeanswedon'thavetopullourselvesoutofthebedasearlyasthedaypupils! 1WhywasthewriternervouswhenhewasatMerchistonCastleSchoolonthefirstday? A.Becausehehadnofriendsandrelativesthere. B.Becausehedidn'tknowtheschoolwell. C.BecausehewasnotgoodatEnglish. D.Becausehewasshy. 2Onthefirstday. A.thoughthewriterwasanxioushesoonrelaxed B.hefoundthedayroomofhisboardinghouseterrible C.hemademanynewfriendsbuthedidn'trememberanyoftheirnames D.hethoughthespokeEnglishbetterthanthestaffintheschool 3WhichofthefollowingisWRONGaccordingtothepassage? A.IntheboardinghousethereareonlystudentsfromSouthKoreaJapanandRussia. B.Theinternationalstudentsintheboardinghousedon'tspeakEnglishveryfluently. C.ThefoodinMerchistondoesn'tmakethewriterdisappointed. D.Theprofessionalcateringcompanythinkstheissueofahealthydietveryimportant. 4Theunderlinedwordboarderinthelastparagraphmeans. A.astudentwhoisfromabroad B.astudentwholivesatschool C.astudentwhoisgoodatEnglish D.astudentwhousedtobeshy
某小组在学习“二氧化碳制取的研究”课题时进行了一系列探究实验．请你一起参与他们的活动并回答以下问题．探究活动一能否用排水法收集CO2 【查阅资料】1标况下1体积的水溶解1体积的CO2 2一定浓度的稀盐酸和石灰石反应时CO2气体生成和从水面逸出的速率远大于其溶解和与水反应的速率 3向澄清的石灰水中通入过量的CO2发生了如下反应 CaCO3+H2O+CO2＝CaHCO32 【实验探究】甲乙两位同学分别用排水法和向上排空气法收集两瓶体积相同的CO2 【实验结论】可以用排水法收集CO2而且与向上排空气法相比排水法在收集CO2时有以下优点． 活动小组的同学还发现块状石灰石和适量稀盐酸反应至气泡逸出不明显后测得其残留液pH＝2．对此他们继续进行探究 探究活动二反应后溶液pH的变化取适量反应后的溶液．逐滴滴入碳酸钠溶液并用pH数字探测仪连续监测得曲线如图纵坐标为pH横坐标为时间 1请解释反应后溶液pH＝2可能的原因 2写出AB段内有关化学方程式． 3写出BC“平台”段化学方程式． 4CD段上升的原因是．
10分1Therewerefewpeopleontheearthandnaturalresourcesseemedtobeunlimited.Todaythingsaredifferent.Theworldhasbecometoocrowded.Weareusingupourresourcestooquicklyandatthesametimewearepollutingourenvironmentwithdangerouschemicals2. Everyonerealizestodayiftoomanyfisharetakenfromtheseatherewillsoonbenoneleft.Yetwithmodernfishingmethodsmoreandmorefisharecaught.Weknowthatiftoomanytreesarecutdownforestswilldisappearandnothingwillgrowintheland.Yetwecontinuetousebiggerandmorepowerfulmachinestocutdownmoreandmoretrees.3Howeverinmostcountrieswasteproductsarestillputintoriversorintotheseaandtherearefewlawstostopthis.Weknowtoothatifthepopulationoftheworldcontinuestoriseinafewyearstherewillnotbeenoughfood. 4Ifweeatmorevegetablesandlessmeattherewillbemorefoodavailableforeveryone.Landthatisusedtogrowcropsfeedsfivetimesmorepeoplethanlandwhereanimalsarekept.5theworldpopulationwillnotrisesoquicklyifpeopleusemodernmethodsofbirthcontrol.Finallyifweeducatepeopletothinkaboutthproblemsweshallhaveabetterandcleanerplanetinthefuture. A.Whatcanwedotosolvetheseproblems? B.Soweshouldtryourbesttoprotecttheenvironment. C.Inthepastmandidn'thavetothinkabouttheprotectionofhisenvironment. D.Werealizethatiftheriversarepollutedwithwasteproductsfromfactorieswewilldie. E.Whydosomepeopledosofoolishthings? F.Ifwecontinuetodothishumanlifewon'tsurviveinthefuture. G.Outnaturalresourceswilllastlongerifwelearntorecyclethem.
8分IdecidedtoskitotheNorthPole.ItwasafterIsawanadvertisementinanewspaperlookingforpeopletojoinateamtoski350milestotheNorthPole.Backin1996therehadneverbeenawomanfromtheU.K.whohadaccomplishedthischallenge.IwonderedwhatitwouldbeliketosurviveintemperaturescoldenoughtofreezeyourfleshinsecondssoIsentofffortheapplicationform. Theapplicationformfullofpicturesofmaleexplorersarrived.ThewordsAreyoumanenoughfortheultimate极端的challenge?mademeangryandevenmoredeterminedtogetontheteam. Over500individualsappliedforaplaceintheteamandtheselectionprocessincludedphysicalandpsychologicaltestsdesignedtopickthebestgroup.InonetesttherewasahugeropeladderwehadtoclimbandIfrozeatthetopbecauseIhaveafearofheights.Ithoughtmyhopeswerefadingasmostotherapplicantssailedpastleavingmebehind.ButtwoothershelpedmeoverandlaterIfoundoutthattheorganizerswerenotlookingforamazingindividualsbutgreatteamplayersandthismomenthadshownthemwhowouldtakecareofothersintheteam. Ihadrevealed展示myweaknessandinaplaceliketheArcticyouhavetobeyourselfasthereisnowheretohide.Thesepersonalitiesofaskingforhelpandshowingweaknessarenecessaryforwomentomaster. IrealizedthatbybeingmyselfIcouldsucceed.Iwasselectedfortheteam.IrealizedthatIcouldachievemorethanIeverimagined﹣﹣﹣moreimportantlybysharingmystorywithothersIcouldinspirethemtotakeastepintothenewworldandrevealmoreoftheirabilities. 1Howdidtheauthorreactonseeingtheadvertisement? A.Shegotcross. B.Shewasdetermined. C.Shegotfrightened. D.Shewashesitating. 2Whatdidtheorganizersviewasthemostimportantintheselection? A.Personalquality. B.Individualability. C.Spiritofteamwork. D.Couragetochallenge. 3Whatdoestheauthorthinkofwomen'sshowingweakness? A.Beneficial. B.Shameful. C.Merciful. D.Disturbing. 4What'stheintentionoftheauthorinwritingthispassage? A.Toinspireustoprepareforourfuturegoal. B.Toadvisewomenhowtoturntoothers. C.Tomakesuggestionstoherteammembers. D.Toencouragepeopletoexploretheunknown.
下列化学用语与含义相符的是
下列关于实验现象的描述正确的是
30分OnewinterwhenIwaseightmyfatherandItookaridetoAuntSally'shouse.Halfwaybackhomethecar1toshakeandslowdown.Dad2thatthecarhadaflattire.Tomake3worsewewerestuckinthemiddleofasnowstorm.Icouldhearthe4inmydad'svoiceashesaidwecouldonlyuseaChristmasmiraclerightnow.IrememberhowmuchI5thatoldredcarmainlybecausetheradiodidn'twork.Actually6reallyworkedinthatcarbut7Dadgothismiracle﹣theheaterbegantooperateandwewerevery8thatwewouldn'tfreezetodeath.We9thereforsomeonetocomealongandhelpusout. Thecoldwindstartedblowingin10thelittlespaceinthedoorandthewindow.Itwhistledandmoanedand11meverymuch.FromthewindIcould12thepinetreeintheairtiedtotheroofofthecar.DadandIbothbegansearchingforsome13toclog堵塞thatthinspaceto14thecoldout.AsI15myjacketpocketIrealizedtherewasapieceoffoldedpaperinit.Ipulleditout16torealizethatitwasthewordsofthecarol颂歌Hallelujah.Ihadasudden17tosingsoIbegantosingit.Dadalso18menowandthen.BythetimeIsangHallelujahafterthesecondversethewindshad19.Aswesang…andeverybreathwedrewwasHallelujahwehearda20honk喇叭声comingfrombehindus.ItwasmyuncleMitchcomingourwaywithhelp. 1A.continued B.tended C.refused D.began 2A.wished B.realized C.doubted D.imagined 3A.conditions B.images C.things D.roads 4A.helplessness B.excitement C.sadness D.disappointment 5A.wanted B.hated C.repaired D.missed 6A.something B.anything C.nothing D.everything 7A.luckily B.expectedly C.generally D.regularly 8A.afraid B.thankful C.sure D..hopeful 9A.called B.asked C.waited D.looked 10A.through B.by C.across D.between 11A.encouraged B.loved C.surprised D.scared 12A.see B.admire C.smell D.grow 13A.way B.time C.person D.energy 14A.give B.take C.let D.keep 15A.fellinto B.reachedinto C.lookedinto D.putinto 16A.just B.even C.only D.still 17A.desire B.chance C.change D.act 18A.supported B.praised C.joined D.comforted 19A.grew B.calmed C.started D.stopped 20A.strange B.familiar C.frightening D.boring
15分TheTowerBridgeisoneofthetwenty﹣sevenbridgesovertheRiverThames.ItisclosetotheTowerofLondonfrom1theTowerBridgegotitsname.ItisasymbolofLondon. ItisrecordedthattheTowerBridge2buildin1894andnowitisoneofthe3famousbridgesintheworld.It'sinterestingthatitsmiddlepartcanberaised4letbigshipspass.Itusedtoberaisedabout50timesadaybutnowitisraisedonly4to5timesaweek.Ifyouareluckyenoughtoseethebridgewithitstwoarmsopenhighintheairyou'llneverforgetit. PeopleoftenthinktheTowerofLondonandtheTowerBridgeare5thesameage.6infacttheTowerofLondonwasbuilt1000yearsagowhilethelatteronly7haveahistoryofover100years. TheTowerBridgewasfirstpaintedchocolatebrown.Lateritwaspaintedredwhiteandblue.ItspicturealsoappearedintheopeningoftheSummerOlympicGames8holdinLondonin2012.Socometovisitthefamousbridge.You'll9surehaveawonderfulexperienceandit'llleaveyoualasting10impress.
下列有关金属的说法不正确的是
为了把徐州建设为“国家生态园林城市”下列行为不正确的是
某兴趣小组用10g镁条与一定溶质质量分数的稀硫酸反应．测得产生氢气的质量与稀硫酸的质量关系如图所示假设镁条中除表面含有氧化镁外．没有其他杂质 1当所用稀硫酸的质量为70g产生的氢气的质量为 2用化学方程式说明当稀硫酸的质量为10g时为什么不产生氢气 3计算稀硫酸中溶质的质量分数
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