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某工厂废液中含有氯化铜和氯化亚铁．某课外小组要将废液进行处理并得到铜和氧化铁两种产品．过程如图所示． （1）加入A物质发生的化学反应方程式为： ； （2）操作Ⅰ和Ⅱ的名称是 ，其中除用...
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某工厂废液中含有氯化钠氯化铜和氯化亚铁某课外小组要从废液中回收铜并得到铁红主要成分Fe2O3要求全过
在氯化铜和氯化亚铁的混合溶液中加入一定量的镁粉充分反应后过滤向滤出的固体中滴加稀盐酸没有气泡产生下列
滤出的固体中一定含有铜，可能含有铁和镁
滤出的固体一定含有铜，一定不含铁和镁
滤液中一定含有氯化镁和氯化亚铁，可能含有氯化铜
滤液中一定含有氯化镁、氯化亚铁、氯化铜
某工厂废液中含有氯化钠氯化铜和氯化亚铁.某课外小组要从废液中回收铜并得到铁红主要成分Fe2O.3要求
在氯化铜和氯化亚铁的混合溶液中加入一定的镁粉充分反应后过滤向滤出的固体中滴加稀盐酸没有气泡产生下列判
滤出的固体中一定含有铜，可能含有铁和镁
滤出的固体中一定含有铜，一定不含有铁和镁
滤液中一定含有氯化镁和绿化亚铁，一定没有氯化铜
滤液中一定含有氯化镁、绿化亚铁、氯化铜
某实验室的废液中可能含有氯化铁硫酸硫酸钠氯化钠氢氧化钠碳酸钠和硝酸钡中的一种或多种初三化学课外活动小
某工厂废液中含有氯化铜和氯化亚铁某课外小组要将废液进行处理并得到铜和氧化铁两种产品过程如图所示1加入
某化学兴趣小组要对实验产生的废液进行研究已知废液中可能含有硝酸钾氯化铜氯化钡氢氧化钠中的一种或几种请
某实验室的废液中含有氯化钙盐酸氯化镁和氯化铜兴趣小组设计以下实验方案从废液制得无水氯化钙查阅资料氯化
金属材料在生产生活中有着广泛的应用1下图所示的金属制品中利用金属导热性的是填选项序号2铁制品表面常会
某工厂废液中含有氯化钠氯化铜和氯化亚铁某课外小组要从废液中回收铜并得到铁红主要成分Fe2O3要求全过
某工厂废液中含有氯化钠氯化铜和氯化亚铁．某课外小组利用废液制取海绵铜Cu和氯化铁两种产品．过程如图所
某工厂废液中含有氯化钠氯化铜和氯化亚铁．某课外小组要将废液经行处理并得到氧化铜和氯化亚铁两种物质．
在氯化铜和氯化亚铁的混合溶液中加入一定量的镁粉充分反应后过滤向滤出的固体中滴加稀盐酸没有气泡产生.下
滤出的固体中一定含有铜，可能含有铁和镁
滤出的固体一定含有铜，一定不含铁和镁
滤液中一定含有氯化镁，可能含有氯化亚铁和氯化铜
滤液中一定含有氯化镁、氯化亚铁、氯化铜
在氯化铜和氯化亚铁的混合溶液中加入一定量的镁粉充分反应后过滤向滤出的固体中滴加稀盐酸没有气泡产生．下
滤出的固体中一定含有铜，可能含有铁和镁
滤出的固体一定含有铜，一定不含铁和镁
滤液中一定含有氯化镁和氯化亚铁，可能含有氯化铜
滤液中一定含有氯化镁．氯化亚铁．氯化铜
某化学课外活动小组的同学对实验室中可能含有氯化铜硫酸硫酸钠氯化钠氢氧化钠碳酸钠和硝酸钡中的一种或多种
某地甲乙两个工厂排出的废液中都含有污染环境的物质甲工厂排出的废液中含有一种有毒的盐使废液呈现蓝色乙工
某工厂废液中含有氯化钠.氯化铜和氯化亚铁某课外小组要从废液中回收铜并得到铁红主要成分Fe2O3要求全
某工厂废液中含有氯化钠.氯化铜和氯化亚铁某课外小组要从废液中回收铜并得到铁红主要成分Fe2O3要求全
金属材料在生产生活中有着广泛的应用1下图所示的金属制品中利用金属导热性的是填选项序号2铁制品表面常会
某实验室的废液中可能含有氯化铁硫酸硫酸钠氯化钠氢氧化钠碳酸钠和硝酸钡中的一种或多种初三化学课外活动小
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现定义一种变换对于一个由有限个数组成的序列S0将其中的每个数换成该数在S0中出现的次数可得到一个新序列S1例如序列S042342通过变换可生成新序列S122122若S0可以为任意序列则下面的序列可作为S1的是
WhenChristopherColumbuslandedonthethenunnamedCostaRicain1502hesawmanyIndianswearinggoldearrings.Sohethoughtthelandmustberichingold.HenamedtheplaceCostaRicawhichmeansrichcoastinSpanish. ThoughlittlegoldwasfoundCostaRicatodayisindeedrichwithcoffeeandbananas.CoffeeisthemostimportantproductinCostaRicaandmostofitisexportedtoothercountrieslikeAmericaandWestGermany.Bananasarethecountry'ssecondmostimportantexport. CostaRicansalsogrowmanyothercropssuchasfruitscornandbeansfortheirownuse.CostaRicanslovecolorsandtheirhousesarepaintedinbrightcolors. EducationisveryimportanttotheCostaRicans.Almosteveryvillagehasaschoolandeducationisamustforchildrenbetweensevenandfourteenyearsofage.Boysandgirlsgotoseparateschools.ClassesbegininMarchandendinNovember.Theotherthreemonthsoftheyearareharvesttimeandthechildrenhavetohelptheirparentstopickcoffeebeans. 1What'sthemainideaofthefirstparagraph? A.HowColumbusfoundCostaRica. B.HowCostaRicagotitsname. C.WhattheCostaRicanswore. D.WhatlanguagetheCostaRicansspoke. 2TheCostaRicansmayNOTpainttheirhouses. A.pinkandred B.greyandblack C.blueandgreen D.yellowandorange 3InCostaRicaboysandgirlsbetweensevenandfourteen. A.mustgotoschool B.studyinthesameschool C.donothavetogotoschoolatall D.canchoosetostopschoolingatanytime 4FromDecembertoFebruaryschoolchildreninCostaRica. A.havelessonseveryday B.havetheirexaminations C.helptheirparentspickcoffeebeans D.helptheirparentsdecoratetheirhouses 5Thispassageismainlyabout. A.ChristopherColumbus B.CostaRica C.someproductsfromCostaRica D.theeducationofCostaRic
如图在正方形ABCD和正方形DEFG中点G在CD上DE＝2将正方形DEFG绕点D顺时针旋转60°得到正方形DE'F'G'此时点G'在AC上连接CE'则CE'+CG'＝．
下列因式分解正确的是
Somepeoplethinkthatsuccessisonlyforthosewithtalentorthosewhogrowupintherightfamilyandothersbelievethatsuccessmostlycomesdowntoluck.I'mnotgoingtosaylucktalentandcircumstancesdon'tcomeintoplaybecausetheydo.Somepeoplearebornintotherightfamilywhileothersarebornwithgreatintelligenceandthat'sjusttherealityofhowlifeis. Howevertosucceedinlifeonefirstneedstosetagoalandthengraduallymakeitmorepractical.Andinadditiontothatinordertogetreallygoodatsomethingoneneedstospendatleast10000hoursstudyingandpracticing.Tobecomegreatatcertainthingsit'llrequireevenmoretimetimethatmostpeoplewon'tputin. Thisisabigreasonwhymanysuccessfulpeopleadviseyoutodosomethingyoulove.Ifyoudon'tenjoywhatyoudoitisgoingtofeellikeunbearablepainandwilllikelymakeyouquitwellbeforeyoueverbecomegoodatit. Whenyouseepeopleexhibitingsomegreatskillsorhavingachievedgreatsuccessyouknowthattheyhaveputinahugepartoftheirlifetogetthereatahugecost.It'ssometimeseasytothinktheygotluckyortheywerebornwithsomeraretalentbutthinkingthatwaydoesyounogoodandthere'sahugechancethatyou'rewronganyway. Whateveryoudoifyouwanttobecomegreatatityouneedtoworkdayinanddayoutalmosttothepointofaddictionandoveralongperiodoftime.Ifyou'renotwillingtoputinthetimeandworkdon'texpecttoreceiveanyrewards.Consistenthardworkwon'tguaranteeyouthelevelofsuccessyoumaywantbutitwillguaranteethatyouwillbecomereallygoodatwhateveritisyouputallthatworkinto. 1Paragraph1mainlytalksabout. A.thereasonsforsuccess B.themeaningofsuccess C.thestandardsofsuccess D.theimportanceofsuccess 2InParagraph2theunderlinedwordthatrefersto. A.beinggoodatsomething B.settingapracticalgoal C.puttinginmoretime D.succeedinginlife 3Successfulpeoplesuggestdoingwhatonelovesbecause. A.workmakesonefeelpain B.onetendstoenjoyhiswork C.onegivesuphisworkeasily D.ittakesalotoftimetosucceed 4WhatcanweinferfromParagraph4? A.Successfulpeopleliketoshowtheirgreatskills. B.Peoplesometimessucceedwithoutluckortalent. C.Peopleneedtoachievesuccessatthecostoflife. D.Ithelpstothinkthatluckortalentleadstosuccess. 5Whatisthemainthemeofthepassage? A.Havingagoalisvitaltosuccess. B.Beinggoodisdifferentfrombeinggreat. C.Onecannotsucceedwithouttimeandpractice. D.Lucktalentandfamilyhelptoachievesuccess
如图所示四边形ABCD是边长为4cm的正方形动点P在正方形ABCD的边上沿着A→B→C→D的路径以1cm/s的速度运动在这个运动过程中△APD的面积scm2随时间ts的变化关系用图象表示正确的是
如图线段ABCD分别表示甲乙两建筑物的高AB⊥BCDC⊥BC垂足分别为BC从B点测得D点的仰角α为60°从A点测得D点的仰角β为30°已知甲建筑物的高度AB＝34m求甲乙两建筑物之间的距离BC和乙建筑物的高度DC．结果保留根号
ForRachaelandLeighBarmanthereisonlyonewishontheirChristmaslistthisyear﹣﹣﹣thattheirsickdaughterPaigeshouldsurviveuntilDecember25.Fifteen﹣year﹣oldPaigesuffersfrom1rarebraindisease2affects影响asfewas12peopleintheworldandcouldkillheranyday3warning警告. Andherconditionhasgoneeven4badinrecentmonths.HerparentsfilledthefamilyhomewithChristmasdecorations5September1stsoshecouldenjoytherestofherlife.Sincethenshehas6regularopenedChristmaspresentsandreceivedvisitors﹣﹣﹣butshesleepsforupto19hoursadayherparentsknowingthateachtimeshecloseshereyesshemayneverwakeup. MrsBarman7describedealingwiththeconditionaslikebeingondeathrowassheneverknewif8daughterwouldwakeupthenextmorning. ThemothersaidShealwayslovesChristmasandIgetmyheart9breakwhenIseehersufferinglikethisOurbestChristmaspresentwouldbehavingPaigewithusatChristmas.Nomatter10sheleavestheworldwemakesurethatsheisalwayshappy.
LastyearmybrotherandIwenttoMiamiforavacation.Someofmyfriendswhohadbeentherebeforesaid1wasawonderfulholidaydestination.Beforewewentwehadplannedformonthswhenthedaycamewewereready. Afterourplanelandedwewenttothehotel.Wehadmadeourreservationsixmonths2earlybutthemanatthefrontdesksaidtherehadbeenamistake.We3tellthatourroomshadn'tbeenreservedforthatweek4fortheweekafter.Ididn'tunderstand5thiswouldhappenandmycreditcardhadalreadybeencharged6thereservation.What'sworsethehotelhadbeenfullybooked.Whenwewerewonderingwhattodothemanagercameout.Shewas7surprisehelpful.SheapologizedforthemistakeandgaveusaspareVIProomon8topfloor.Wehadneverstayedinsuchanamazingroomandweweren'tchargedextra. ThenextdaymybrotherandIwenttothebeach9wewatchedsomepeopleplayvolleyball.Wegotalittle10sunburnbutthedayhadbeensorelaxingthatwedidn'tmind.
解不等式组．把不等式组的解集在数轴上表示出来．
关于x的分式方程＝的解是．
如图是由四个直角边分别为3和4的全等的直角三角形拼成的“赵爽弦图”小亮随机的往大正方形区域内投针一次则针扎在阴影部分的概率是．
已知顶点为P的抛物线C1的解析式是y＝ax﹣32a≠0且经过点01． 1求a的值 2如图将抛物线C1向下平移hh＞0个单位得到抛物线C2过点K0m2m＞0作直线l平行于x轴与两抛物线从左到右分别相交于ABCD四点且AC两点关于y轴对称． ①点G在抛物线C1上当m为何值时四边形APCG是平行四边形 ②若抛物线C1的对称轴与直线l交于点E与抛物线C2交于点F试探究在K点运动过程中的值是否会改变若会请说明理由若不会请求出这个值．
﹣2的相反数是
中国式过马路是网友对部分中国人集体闯红灯现象的一种调侃即“凑够一撮人就可以走了和红绿灯无关”针对这种现象某媒体记者在多个路口采访闯红灯的行人得出形成这种现象的四个基本原因①红绿灯设置不科学交通管理混乱占1%②侥幸心态③执法力度不够占9%④从众心理该记者将这次调查情况整理并绘制了如下尚不完整的统计图请根据相关信息解答下列问题． 1该记者本次一共调査了名行人 2求图1中④所在扇形的圆心角并补全图2 3在本次调查中记者随机采访其中的一名行人求他属于第②种情况的概率．
IwastenwhenIfirstsatwithmygrandmotherbehindthecashier收银台inhergeneralstore.1Iquicklylearnedtheimportanceoftreatingcustomerspolitelyandsayingthnakyou. AtfirstIwaspaidincandy.2Iworkedeverydayafterschoolandduringthesummerandonweekendsandholidaysfrom8a.m.to7p.m.Myfatherhelpedmesetupabannkaccount.3 BythetimeIwas12MygrandmotherthoughtIhaddonesuchagoodjobthatthepromotedmetosellingcosmetics化妆品.Idevelopedtheabilitytolookcustomersdirectlyintheeye.EventhoughIwasjustakidwomenwouldaskmesuchthingsasWhatcolordoyouthinkIshouldwear?Itookarealinterestintheirquestionsandwasabletotranslatewhattheywantedintomakeup化妆ideas.4 Thejobtaughtmeavaluablelessontobeasuccessfulsalespersonyoudidn'tneedtobeaRocketscientist﹣youneededtobeagreatlistener.5expecttheyareNOlongerwomenpurchasingcosmeticsfrommeinsteadtheyarekidswhotellmewhichtoystheywouldliketoseedesignedanddeveloped. A.LaterIreceived50centsanhour. B.Beforelongsheletmesirtherebymyself. C.Iendedmysellingarecordamountofcosmetics. D.TodayIstillcarrythatlessonwithmeIlistentocustomers. E.Mygrandma'strusttaughtmehowtohandleresponsibility. F.SoonIfoundmyselflookingmorebeautifulthaneverbefore. G.WatchingmymoneygrowwasmorerewardingthananythingIcouldhavebought.
阅读材料设一元二次方程ax2+bx+c＝0a≠0的两根为x1x2则两根与方程系数之间有如下关系x1+x2＝﹣x1•x2＝．根据该材料填空已知x1x2是方程x2+6x+3＝0的两实数根则+的值为
请写一篇吸烟危害的短文. 内容要点吸烟会导致许多疾病甚至一些危及生命的疾病. 吸烟不但对吸烟者自己有害也严重影响不吸烟者的健康. 据报道美国每年至少有32万人因吸烟而丧生.目前约有四千万人仍在吸烟. 可喜的是越来越多的人已认识到其危害开始戒烟. 青年学生不应该养成这一恶习如有这一习惯应尽早戒除.
如图水平地面上有一面积为30cm2的扇形AOB半径OA＝6cm且OA与地面垂直在没有滑动的情况下将扇形向右滚动至OB与地面垂直为止则点O移动的距离为
如图所示正方形网格中△ABC为格点三角形即三角形的顶点都在格点上．1把△ABC沿BA方向平移后点A移到点A1在网格中画出平移后得到的△A1B1C12把△A1B1C1绕点A1按逆时针方向旋转90°在网格中画出旋转后的△A1B2C23如果网格中小正方形的边长为1求点B经过12变换的路径总长．
关于x的一元二次方程ax2﹣2x+1＝0有实数根则整数a的最大值是
如图将两张长为5宽为1的矩形纸条交叉让两个矩形对角线交点重合且使重叠部分成为一个菱形．当两张纸条垂直时菱形周长的最小值是4把一个矩形绕两个矩形重合的对角线交点旋转一定角度在旋转过程中得出所有重叠部分为菱形的四边形中周长的最大值是
“保护水资源节约用水”应成为每个公民的自觉行为．下表是某个小区随机抽查到的10户家庭的月用水情况则下列关于这10户家庭的月用水量说法错误的是
不等式的解是．
Asweallknowfriendshipisofgreatimportanceinourdailylife.Afriendcangiveushelpandshareourdifficultiesandhappiness.Buthowtomakefriendsisstilldifficulttosomeofus.1 1.Befriendlytoothers.2Youshouldtrytomakeastrangerfeelathomewhereverhehappenstobe.Thinkmoreofothersthanofyourselfandneverjudgeapersonbyhisappearanceandclothes. 2.Bereliable.Ifyouandyourfriendagreetomeetsomewheredon'tbelate.Ifyou'renotgoingtomakeitontimeormakeitatallcallthemassoonasyourealizeit.3Besomeonethatpeopleknowtheycandependon. 3.4Listencarefullytowhatpeoplesayrememberimportantdetailsaboutthemtheirnamestheirlikesanddislikesaskquestionsabouttheirinterestsandjusttakethetimetolearnmoreaboutthem. 4.EncourageyourfriendsAtruefriendalwaysgivescouragetohisfriends.5Nevermakefunoforlaughatyourfriendsinfrontofothers.Youshouldcometosupportthem. A.Whenyousayyou'lldosomethingdoit. B.Afriendtoallisafriendtonone. C.Beagoodlistener. D.Thefollowinginformationcangiveyousometips E.Smileatothersandyouaresuretogetasmileinreturn. F.Hewillremainwiththeminbothgoodaswellasbadtimes. G.Andneverleaveyourfriendwhenheisintrouble.
MyAmericanfriendkindlyinvitedmetoherhometocelebratethisyear'sThanksgivingDay.I1experiencemyfirsteverThanksgiving. OnthatdaywewatchedtheThanksgivingparade游行inNewYorkCityonTV.Myfriend'sfamilysat2frontofthetelevision.TheycamefromallovertheStatesandenjoyedbeingtogether.3lookattheirhappyfacesIthoughtitwasreallyaholidayforfamiliesjustliketheMid﹣AutumnFestivalinChina. ThateveningwehadabigThanksgivingdinner.This4traditionmealincludesroastturkeymashedpotatoesandassortedvegetables.Whenthedishesandplatesarrivedatthetablewestartedtotake5turntosaythethingswewere6thankfor.ThisinfactisaThanksgivingtraditionmanyfamiliespracticeintheUS. Thenthefood7passaroundthetableandweallatefartoomuch.Ialsohaddessertswithmydinner.There8bedifferentkindsofpiessuchasapplepiespumpkinpiesandcoconutpies. IfonementionsThanksgivingonemusttalkaboutBlackFridaytheFriday9followsThanksgivingDay.ShopsacrosstheUnitedStateswillgivetheir10bigsalesofthewholeyearonBlackFriday.Manypeoplegocrazyaboutit.Isawmanylongqueuesoutsidetheshopsonthatday.
如图已知AB是⊙O的直径PA＝PB∠P＝60°则弧CD所对的圆心角等于度．
如图在Rt△ACB中∠C＝90°AC＝3cmBC＝4cm以BC为直径作⊙O交AB于点D． 1求线段AD的长度 2点E是线段AC上的一点试问当点E在什么位置时直线ED与⊙O相切请说明理由．
计算2﹣1+﹣12019+|﹣|﹣π﹣3.140
下列计算中正确的是
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