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在平面直角坐标系xOy中，点A（0，a），B（b，12﹣b），C（2a﹣3，0），0＜a＜b＜12，若OB平分∠AOC，且AB＝BC，则a+b的值为＝ ．
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在平面直角坐标系xoy中若A.点坐标为﹣33B.点坐标为20则△ABO的面积为A.15B.7.5C.
点203在空间直角坐标系中的位置是在
y轴上
xOy平面上
xOz平面上
yOz平面上
在平面直角坐标系xoy中四边形ABCD的边AB∥DCAD∥BC已知点A.－20B.68C.86则D.
下列叙述中正确的个数是①在空间直角坐标系中在Ox轴上的点的坐标一定是0bc②在空间直角坐标系中在yO
1
2
3
4
平面直角坐标系xOy中点A23若将OA绕原点O逆时针旋转180°得到0A'则点A'在平面直角坐标系中
第一象限
第二象限
第三象限
第四象限
有下列叙述①在空间直角坐标系中在x轴上的点的坐标一定可记为0bc②在空间直角坐标系中在y轴上的点的坐
在平面直角坐标系xOy中有点A21和点B若△AOB为等腰直角三角形则点B的坐标为.
在平面直角坐标系xOy中点P.-23关于y轴的对称点的坐标是.
如图在平面直角坐标系xOy中△AOB三个顶点的坐标分别为O.00A.﹣23B.﹣42将△AOB绕点O
如图在平面直角坐标系xOy中△
′
′
在平面直角坐标系xOy中四边形ABCD的边AB∥DCAD∥BC已知点A.－20B.68C.86则D.
点
(2,0,3)在空间直角坐标系的位置是( ) A.y轴上
xOy平面上
xOz平面上
yOz平面上
在平面直角坐标系xOy中已知点A23若将OA绕原点O逆时针旋转180°得到0A′则点A′在平面直角坐
第一象限
第二象限
第三象限
第四象限
如图在平面直角坐标系xOy中△AOB三个顶点的坐标分别为O.00A.-23B.-42将△AOB绕点O
在平面直角坐标系xOy中点A.B.的坐标分别为2﹣130以原点O.为位似中心把线段AB放大点B.的对
下列说法中正确的是
平面直角坐标系是由两条互相垂直的直线组成的
平面直角坐标系是由两条相交的数轴组成的
平面直角坐标系中的点的坐标是唯一确定的
在平面上的一点的坐标在不同的直角坐标系中的坐标相同
点
（2，0，3）在空间直角坐标系中的（ ） A.y轴上
xoy平面上
xoz平面上
yoz平面上
如图在平面直角坐标系xOy中若菱形ABCD的顶点AB的坐标分别为﹣3020点D在y轴上则点C的坐标是
在平面直角坐标系XOY中点集K={xy||x|+2|y|﹣42|x|+|y|﹣4≤0}所对应的平面区
如图在平面直角坐标系xOy中若菱形ABCD的顶点AB的坐标分别为﹣3020点D在y轴上则点C的坐标是
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8分Thesehotelsdon'thaveallthenecessaryfacilitiesbuteachofthemofferssomethingdifferent.Don'tmissthemifyoutraveltoCanada. SleeponatrainattheTrainStationInn.ThishotelisinanoldtrainstationinNovaScotia.TheownersJamesandShelleyLeFresneusethestationandthetrainasrooms.TherearesevenoldcarsandthereisalsoarestaurantinthediningcarPricesarefrom＄89to＄169perroomortraincar. SleepinajailintheCanadiancapitalOttawa.HereyoucansleepintheolddowntownOttawaJailHostel.Therearegrouporprivatebedrooms.Therearestillbarsonthedoors!Pricesarefrom＄25to＄65.Don'tworrytherearen'tanycriminalsthere! SleepinatepeeatentoftheAmericanIndiansataUNESCOWorldHeritagesiteinAlberta.Atthishotelthereareguidedtoursandlessonsinlocalculture.Thebestpartsleepinginarealtepeeoutside.Thepriceisaround＄300or＄620forafullpackage. SleepinalighthouseattheQuirponLighthouseInn.ThishotelisonNewfoundland'sQuirponIsland.Therearegreatviewsoftheoceanfromthewindows.Thereare11privateroomsintotal.Pricesarefrom＄225forasingleto＄350forasuite.Mealsareincludedintherestaurant.ThehotelhasthetraditionallookandfeelofthelighthousesothereisnoInternetTVortelephonesintherooms.Therearetoursavailableandboattourstotheislandareincluded. 1WhatcanyoudoifyouchoosetheTrainStationInn? A.Shopintheoldtraincars. B.Learnhowtodrivethetrain. C.Havemealsinthediningcar. D.EnjoyarailtourofNovaScotia. 2InwhatwayisstayinginatepeeinAlbertaspecial? A.Itserveslocalfoodtodiners. B.Youcansleepintheopenair. C.YoucantourAlbertaforfree. D.Itofferslessonsonmakingtepees. 3WhichisunavailableattheQuirponLighthouseInn? A.Privaterooms. B.Guidedtours. C.Dailymeals. D.TheInternet. 4You'llpaytheleastifyouchoosetosleep A.intheOttawaJailHostel B.attheTrainStationInn C.inatepeeinAlberta D.attheQuirponLighthouseInn
回答下列问题 1某原子结构示意图和在周期表中的信息如图1．则该元素的质子数为该元素属于选填“金属”或“非金属”元素它在化合物中的化合价为． 2如图2形象地表示了某化学反应前后分子的变化．其中“”表示氧原子“”表示碳原子．该反应的化学方程式为．
8分Scientistshavebeenstudyinghowpeopleusemoneyforlong.Nowthey'refindingsometheoriesmayapplytoonegroupofmonkeys. Researchersrecentlytaughtsixmonkeyshostousemoney.Theygavethemonkeyssmallmetaldisks圆片thatcouldbeusedlikecashandshowedthemsomeyummyapplepieces.Themonkeyssoonfiguredoutthatiftyeygaveoneofthediskstoascientistthey'dreceiveapieceofappleinreturn. Ifyouthinkthatisallthemonkeyscanfigureoutyouarewrong.TworesearchersJakeandAllisonactedasapplesellersintheexperiments.Themonkeysweretestedoneatatimeandhad＝12diskstospendineachexperiment.JakealwaysshowedthemonkeysonapplepiecewhileAllisonalwaysshowedtwopieces.Butthat'snotnecessarilywhattheygavethemonkeys.Thenumberofapplepiecesgivenforadiskwasdeterminedatrandom. ExperimentOneAllisonshowedtwopiecesofapplesbutgavebothpieceonlyhalfthetime.Theotherhalfshetookonepieceawayandgavethemonkeyjusttheremainingpiece.Jakeontheotherhandalwaysgaveexactlywhatheshowedonepieceforeachdisk.ThemonkeyschosetotrademorewithAllison. ExperimentTwoAllisoncontinuedtosometimesgavetwopiecesandsometimesonepiece.ButnowhalfthetimeJakegavetheoneapplepiecehewasshowingandhalfthetimeheaddedabonus.Guesswhat?ThemonkeyschosetotrademorewithJake. InthefirstexperimentthemonkeyscorrectlyfiguredoutthatiftheytradedwithAllisonthey'dendupwithmoretreats.InthesecondonewhenamonkeyreceivedtwopiecesfromJakeitseemedlikeagain.WhenAllisongavethemonkeyonlyonepieceinsteadofthetwosheshoweditseemedlikealoss.ThemonkeyspreferredtradingwithJakebecausethey'drathertakeachanceofseemingtowinthanseemingtolose. Wealsosometimesmakesillybusinessdecisionsjusttoavoidthefeelingthatwe'regettinglessevenwhenwe'renot.Wouldyouhavemadethesamechoices? 1Whatconclusionmightexpertsdrawfromthefirstexperiment? A.Peoplearesmarterintermsoffinance. B.It'seasytoteachmonkeyshowtotrade. C.Businesstheoriescanapplytoallmonkeys. D.Themonkeysshowcertainbusinesssense. 2Whatdoesabonusinparagraph5referto? A.Acoin. B.Achance. C.Ametaldisk. D.Anapplepiece. 3WhydidthemonkeyschoosetotrademorewithJakeinthesecondexperiment? A.Becausetheydidn'tlikethefeelingoflosing. B.BecausetheygetmoreapplepiecesfromJake. C.BecauseJakealwaysgavethemtwoapplepieces. D.BecausetheapplepiecesfromJakewereyummy. 4Whatcouldbethebesttitleforthepassage? A.DiskforAppleWhotoTradewith? B.ShoppingforBargainSameofdifferent? C.Moneky'sBusinessSenseSmartorSilly? D.People'sBusinessDecisionLoseorGain?
下列实验方案不合理的是
15分BornonJune121929AnneFrankwasaGerman﹣Jewishteenager1wasforcedtogointohidingduringtheHolocaust大屠杀.Sheandherfamilyalongwithfourothers2spendovertwoyearsduringWorldWarⅡ3hideinanotherpartofroomsaboveherfather'sofficeinAmsterdam. Sinceitwasfirstpublishedin1947AnneFrank'sdiaryhasbecomeoneofthe4powerfulmemoirs回忆录oftheHolocaust.5itmessageofcourageandhopeinthefaceofdifficultyhasreachedmillions.Thediaryhasbeentranslatedintomorethan60languageswithover30millioncopies6sell.AnneFrank'sstoryisespecially7meaningtoyoungpeopletoday.Formanysheistheirfirstexposure接触tothehistoryoftheHolocaust. AfterbeingreportedtotheNazisAnneherfamilyand8otherslivingwiththemwerearrested逮捕andsenttoNaziconcentrationcamps.InMarchof1945several9monthaftershewasarrestedAnneFrankdied.Shewasfifteenyearsold. Hercourageandlegacyliveonandsheisfrequentlyregarded10arolemodelfortod
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. 修改在错的词下画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. ManystudentsgotoInternetbarsplayvideogamesthattakesmuchoftheirprecioustime.SomestudentsevenstayedinInternetbarsdayandnightforgottheirstudies.Nodoubtthesestudentswillfinallyendupwiththeirbrightfuturedestroy.Furthermoresomestudentsvisitunhealthilywebsitesbyaccidents.Andtheyarefinallyabsorbedtotheexcitementofreadingunhealthystoriesorwatchingdirtyvideos.AlltheseareharmfultotheteenagersandifonlythisisnotcontrolledortheuseoftheInternetisnotproperlyguidedsomeofuswillgothewrongway.
6分STOCKHOLMMarch11Xinhua﹣﹣AlthoughstillcoldintheNordicinearlyspringSwedishkidscouldn'twaittogoforoutdooractivitiesintheearlyspring. OnSaturdayoutdoorclubsandexhibitorsbroughttheirnewproductstotheSwedishOutdoorShow2017inStockholmandencouragedkidstoplayandjointheiractivities. ThisisgoldpanningthatwedointhemiddlepartofSwedenasmalltowncalledKopparberg.ItisaniceactivityforchildrenforadultsjusttobeoutinthenatureandseethelovelynaturethatwehaveinSwedenandmaybefindsomegoldexhibitorUllaKalander﹣KarlssontoldXinhua.TheyhaveseentheprogramontelevisioncalledGoldRushthatcomesfromCanada.Somanypeopleareinterestedingoldpanningtheywanttoberich.Butyoudonotberichyoujustberichofseeingthenaturesheadded. ApartfromtraditionalactivitieslikekayakingandclimbingdivingisanotherfavoriteoutdoorsportsfortheSwedes. Stockholmissurroundedbylakesandeveryoneisreallygoingintolakesanddivingswimmingetc.KidsaretaughttoswimalreadyinschoolsoeverySwedishkidcanswimandgoingfromthereintodivingiseasyofcourseexhibitorAndersHolmbergtoldXinhua. Thethree﹣daySwedishOutdoorShowlastsuntilSundayandisexpectedtobringabout30000activeoutdoorpeoplewithdifferentinterestsandlevelsofexperience. 1HoldingSwedishOutdoorShowisto. A.makesomepeoplebecomerich B.makeaprofitfortheorganization. C.getmorepeopletogetclosetonature D.makepeoplemuchstrongerinhealth 2Theunderlinedpartinthefirstparagraphprobablymeans. A.werenotwillingtogo B.hadastrongdesiretogo C.couldhavenoalternativebuttogo D.coulddecidewhethertogoornot 3TheAuthor'spurposeofwritingthepassageisto. Ainform B.entertain C.persuade D.describe
下列图示实验能达到目的是
25分假如你是李华你的英国笔友Peter即将完成学业不久前来信就是否到中国工作询问你的意见.请根据以下提示回一封电子邮件 1建议他来中国 2阐述你的理由就业机会多所学专业受欢迎不同的文化体验等 3承诺可提供帮助. 参考词汇专业major 注意 1词数100～120 2文章开头和结尾已给出不计入总词数 3可适当增加细节以使行文连贯. DearPete I'mverygladtohavereceivedtheletteryousentmelastweek. Bestwishes. Yours LiHua.
某饼干包装上的说明部分如图所示下列说法正确的是
某校化学兴趣小组学习了气体的制取和收集后对相关知识进行总结请你一起参与并完成下面内容 1写出下列仪器名称ab． 2请写出装置A制取氧气化学方程式．若用E装置收集氧气则氧气应从口通入填“c”或“d” 3装置BC都可用来制取二氧化碳装置C相对于装置B在操作方面的优势是． 4加热碳酸氢钠NaHCO3固体来制取CO2应选用的发生装置为若用F收集CO2并测量生成的CO2气体的体积其中在水面上放一层植物油目的是植物油上方原有的空气对实验结果填“有”或“无”明显影响．
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
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.
危险化学品要在包装标签上印警示性标志．氢氧化钠应选用的标志是
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.
鉴别下列物质所用的方法错误的是
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.
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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