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某公司计划开发一批新产品，由甲、乙两个工厂同时加工这批产品，乙工厂先加工了5天后，维修设备，维修完设备后提高了工作效率．继续加工这批产品，结果比甲工厂早3天完成任务．甲、乙两工厂加工新产品的数量y甲...
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某公司开发生产的1200件新产品需要精加工后才能投放市场现有甲乙两个工厂都想加工这批产品．公司派出
列方程或方程组解应用题为了提高产品的附加值某公司计划将研发生产的1200件新产品进行精加工后再投放市
为了提高产品的附加值某公司计划将研发生产的1200件新产品进行精加工后再投放市场.现有甲乙两个工厂都
为了提高新产品的附加值某公司计划将研发生产的1200件新产品进行精加工后再投放市场现有甲乙两个工厂都
1如图在△ABC中AB=CB∠ABC=90°D为AB延长线上一点点E在BC边上且BE=BD连结AE.
为了提高产品的附加值某公司计划将研发生产的1200件新产品进行精加工后再投放市场.现有甲乙两个工厂都
某公司开发的690件新产品需加工后方能投放市场现有甲乙两个工厂都想加工这批产品已知甲工厂单独加工这
为了提高产品的附加值某公司计划将研发生产的1200件新产品进行精加工后再投放市场.现有甲乙两个工厂都
某公司计划将研发生产的1200件新产品进行精加工后再投放市场现在甲乙两个工厂都具备加工能力公司派出相
为了提高产品的附加值某公司计划将研发生产的1200件新产品进行精加工后再投放市场.现有甲乙两个工厂都
某开发公司生产的960件新产品需要精加工后才能投放市场．现有甲乙两个工厂都想加工这批产品已知甲厂单
为了提高产品的附加值某公司计划将研发生产的1200件新产品进行精加工后再投放市场.现有甲乙两个工厂都
为了提高产品的附加值某公司计划将研发生产的件新产品进行精加工后再投放市场.现有甲乙两个工厂都具备加工
列方程解应用题为了提高产品的附加值某公司计划将研发生产的1200件新产品进行精加工后再投放市场.现有
某开发公司生产的960件新产品需要精加工后才能投放市场．现有甲乙两个工厂都想加工这批产品已知甲厂单独
某公司开发的960件新产品需加工后才能投放市场现有甲乙两个工厂都想加工这批产品已知甲工厂单独加工完
某公司开发生产的1200件新产品需要精加工后才能投放市场现有甲乙两个工厂都想加工这批产品．公司派出
某开发公司生产的960件新产品需要精加工后才能投放市场现有甲乙两个工厂都想加工这批产品已知甲厂单独加
某公司研发1000件新产品需要精加工后才能投放市场．现在甲乙两个工厂加工这批产品已知甲工厂单独加工
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下列有关物质的检验鉴别除杂分离所用的试剂或方法正确的是
10分阅读短文从A﹣E五个句子中选择正确选项还原到文中使短文内容完整正确. A.Anditencouragesyoungpeopletobemoreconfident.B.Musictouchesourheartsandshortens缩短thedistanceC.JayChoudoesmostofthesingingpartwhileKobeplaysapartofarapper说唱者.D.AllthemoneyfromthedownloadswillgotoProjectHope.E.That'sasongwrittenbyJayChouwhosefavoritesportisbasketball. 96betweenpeopleofdifferentcountries.ThesuperstarJayChouhascooperatedwiththeAmericanNBAstarKobeBryanttocreateasongnamedTheHeavenandEarthChallenge.97Itexpressestheloveforbasketball.98JayChouhaslearnedmuchfromKobe'ssportsspirit.Inthesong99Peoplecandownloadtheringtone铃声ofthesongfromtheInternet.100whichaimstoimproveeducationalenvironmentinpoorareasinChina. 96. 97. 98. 99. 100.
5分Therearealotofschoolrulesaroundtheworld.ForexampleinAustraliaCanadaJapanandtheUnitedStatesstudentshavetowearuniformsandtheyarenotallowedtowearearrings. SomeschoolsinJapanandothercountrieshaverulesabouthair.Forexamplestudentsarenotallowedtochangethecoloroftheirhair.IntheUnitedStatesboyscannothavetheirhairgrowlong. ForsafetyatsomeUSschoolsstudentsmusthaveapairofindoorshoesatschooleveryday.Thismakessurestudentswon'tfalloveronthewetfloorsandkeepstheschoolsclean. GumchewingisnotallowedinmanyUSschoolbuildingsasitisdifficulttocleanup.Andifstudentschewguminclasstheymaynotpaymuchattentiontotheirstudies. Inmostforeigncountriesschoolstudentsareallowedtoworkpart﹣time.ButdifferentlyJapaneseschoolstudentsarenotallowedtoworkpart﹣timeorchangethecoloroftheirhair. 41.Whichcountriesshouldstudentsnotbeallowedtowearearringsin A.EnglandandJapan. B.AustraliaandJapan. C.CanadaandChina D.TheUSAandFrance. 42.ArestudentsallowedtochangethecoloroftheirhairinJapan A.Yestheyaren't. B.Notheyare. C.Yestheyare. D.Notheyaren't 43.WhymuststudentshaveapairofindoorshoesatschooleverydayatsomeUSschools A.Thismakesstudentsexercisemoreeasily. B.Thismakesstudentswon'tfalloveronthewetfloors. C.Thiskeepstheschoolsclean. D.Thiskeepstheschoolscleanandmakesstudentssafe. 44.Whatmayhappenifstudentschewguminclass A.Itisdifficulttocleanup. B.Studentswillfalloverintheclassroom. C.Studentsmaynotpaymuchattentiontotheirstudies. D.Theteacherswillbeveryangry. 45.Whatshouldn'tthestudentsbeallowedtodoinJapan A.Theyaren'tallowedtochewgum. B.Theyaren'tallowedtowearuniforms. C.Theyarenotallowedtoworkpart﹣timeorchangethecoloroftheirhair. D.Theyarenotallowedtoeatintheclassroom.
下列各组离子在溶液中能大量共存并形成无色透明溶液的是
绿茶中的单宁酸具有清热解毒抗癌等功效其化学式为C76H52O46．下列关于单宁酸的说法正确的是
10分在下面的空白处填入适当的话语话语可以是句子短语或词 ABobwhatareyoudoingB61.Theletterisaboutbadhabits. AWhatdoyoumean BIseesomepeoplethrowlitteraround.Andsomeoftenwastewater.Youknowwaterisveryimportanttous.AYouareright.62 BTotheTVstation.Ihopetheycancallonpeopletoprotectourenvironment AThenwhatshouldwedotoprotectourenvironment BI'dliketogotothePeople'sParkwithmyfriendsthisSaturday.63 AYesI'mfree.64BWe'regoingtocollectrubbishthere. AGoodidea!I'dliketojoinyou.65 BWe'llmeetat8o'clockatthegateofthepark.Seeyouthen!ASeeyou. 61. 62. 63. 64. 65.
15分个人的成长离不开他人的支持.请结合下面的提示词以PeopleWhoHelpMe为题写一篇80词左右的短文.分别谈谈老师家人及朋友曾在哪些方面给予你关心和帮助你将怎样回报他们. 要求1.条理清楚书写工整句式规范标点符号和大小写使用正确. ＝2.短文中不能出现真实的人名地名.文章开头已给出不计入单词总数. ＝3.提示词语careforknowledgeencouragesupportdifficultyinthefuturestudyharder提示词不必全部用上.PeopleWhoHelpme DuringtheseyearsIhavegotlotsofhelpfrommyparentsteachersandfriends..
我们已经学习很多物质并进行分类下列各组表示同一种物质的是
人体内的下列体液中呈酸性的是
2分我喜欢对人友好的人..
2分珍爱自己远离毒品.Becareofourselvesanddrugs.
化学为人类社会进步作出了重要的贡献下列对化学的认识中正确的是
为及时发现燃气泄漏常在燃气中加入少量有特殊气味的乙硫醇C2H5SH乙硫醇也可以充分燃烧化学方程式为2C2H5SH+9O2aCO2+2X+6H2OX是氧化物．下列说法不正确的是
下列图象与所述实验相符的是
把XY两种金属分别放入另外两种金属ZM的盐溶液中实验结果如下表其中“/”表示金属与盐 溶液不发生反应“√”表示金属与盐溶液能发生反应． 上述四种金属的活动性顺序由强到弱的是
人类的生存与发展离不开化学． 1生活中常把榨好的蔬菜汁放到面粉中做成蔬菜馒头这种馒头提供的主要营养物质是淀粉和． 2铁是应用最广泛的金属．喷漆能防止铁生锈原因是工业炼铁时一氧化碳和磁铁矿 主要成分是四氧化三铁发生的主要反应的化学方程式为． 3生活中硬水软化的常用方法是． 4__是工业上冶炼黄金的重要原料工业上生产__的化学方程式为2Na+2C+2X＝2NaCN+ 3H2X的化学式为该气体能使湿润的红色石蕊试纸变． 5配制农药波尔多液的盐是填名称请用化学方程式解释其不能用铁桶盛装的原因 该反应观察到的现象是．
化学是一门以实验为基础的自然学科．下列实验操作中正确的是
6分Mostbeesarebrownhairy多毛的and8to22millimeterslong.Beesarealargefamily.Over25000kindshavebeenfound.73.Amongallofthemhoneybeesarethemostcommon. Honeybeesalwaysliveingroupscalledhives蜂群.Eachhivehasaqueendrones雄蜂andworkers工蜂.Likeahumansocietyeachbeeinahiveknowsitsownjob. 74.Tocollectapoundofhoneyabouthalfakilogrammeabeemayhavetoflyalongway. Sometimesitiseguivalentto相当于twicearoundtheworld.75.Beeshavetovisitmorethan10000flowerstomakeapoundofhoney. 73. 74. 75..
碳酸钾和碳酸钙的固体混合物75g与足量的稀盐酸充分反应后如果将反应后的溶液蒸干得到82.7g固体则原混合物中金属元素的质量分数为
2分我们都坚信钓鱼岛属于中国.WeallbelievethatDiaoyuislandChina.
如图1是元素周期表中的一部分图2是硒原子的结构示意图．据图回答问题 1图2中m的值为n的值为 2硒元素位于元素周期表中的第周期硒化钠的化学式为．
同学们需要7.5g食盐和42.5mL水用于实验如图为实验操作过程 1称取7.5g食盐时1g以下需要移动游码若按如图操作天平平衡时实际称得的药品质量 填“偏大”“偏小”“不变”． 2按正确操作称取食盐时发现指针偏向右测应如何操作． A．减少砝码B．增加食盐C．调节平衡螺母 3需要量取42.5mL水量筒的规格应选择2050100mL． 4经检测配制出来的NaCl溶液溶质质量分数偏小其原因可能有填序号． ①氯化钠固体不纯②称好的食盐有部分洒落到烧杯外 ③量取水时仰视读数④装瓶时有少量溶液洒出
下列有关实验叙述不符合事实的是
小红同学发现上个月做实验用的氢氧化钠溶液忘记了盖瓶盖他对该溶液是否变质及变质程度产生了兴趣于是他和同学一起对其进行探究． 【提出问题】氢氧化钠是否变质及变质的程度如何 【猜想与假设】 小丽猜想没有变质只含有氢氧化钠小明猜想全部变质只含有碳酸钠． 小红的猜想部分变质含有 氢氧化钠在空气中变质的化学方程式是． 【实验探究】 小丽取待测氢氧化钠溶液于试管中滴入几滴酚酞试液酚酞试液变红小丽说氢氧化钠没有变质小红认为她的结论不正确其理由是． 请你验证小红的猜想成立并完成实验报告． 【拓展提升】除去部分变质的氢氧化钠溶液中的杂质方法是．用化学方程式表示
5分WhatareyougoingtodoifyouareinaburninghouseHowwillyouescapeDoyouknowhowtosaveyourselfPleasereadthefollowingpassage. Escapingafireisaseriousmatter.Knowingwhattododuringafirecansaveyourself.Itisimportanttoknowthewaysyoucanuseandtoshowthemtoeveryoneinthefamilysuchasstairways楼梯andfireescapesbutnotlifts. Fromthelowerfloorsofthebuildingsescapingthroughwindowsispossiblelearnthebestwayofleavingthroughwindowswiththeleastchanceofseriousinjury伤害. Thesecondfloorwindowisusuallynotveryhighfromtheground.Anaverage普通的personhangingbythefinger﹣tips手指尖willhaveadropofaboutsixfeettotheground.Itisabouttheheightofanaverageman.Ofcourseitissafertojumpashortwaythantostayinaburningbuilding. Windowsarealsousefulwhenyouarewaitingforhelp.Besuretokeepthedoorclosed.Orsmokeandfiremaybedrawn向某方向移动intotheroom.Keepyourheadlowatthewindowtobesureyougetfreshairratherthansmokethatmayhaveleaked泄露intotheroom. Onasecondorthirdfloorthebestwindowsforescapearethosewhichopenontoaroof屋顶.Fromtheroofapersoncandroptothegroundmoresafely.Droppingontocement水泥mightendininjury.Bushesandgrasscanhelptobreakafall. 51.Itisimportantto. A.knowthewaystoescapeafire B.putoutafireinaburninghouse C.jumpoutofaburninghouse D.keepthedoorclosed 52.Itispossibletoescapethroughthewindows.. A.ifyouarestrongenough B.iftherearesomebushesontheground C.ifyouliveonalowerfloor D.ifyouhavealongrope 53.Whichofthefollowingwaysofescapingisnotright. A.Youcanescapethroughstairways B.usealifttocomedownatonce C.Escapethroughthewindowswhichopenontoaroof D.Youcanchoosefineescapes 54.Keepyourheadlowatthewindowsothatifthebuildingisonfire A.youcangetfreshair B.youcancallforhelp C.youcaneasilyjumpoff D.youcanbeseenfirst 55.Thebesttitleforthepassageis. A.Escapingthroughthewindows B.SaveYourselffromABurningHouse C.Knowledgeonfire D.WaitingforHelp.
10分Sometimespeoplecomeintoyourlifeandyouknowthattheyaretheretoteachyoualessonortohelpyouunderstandwhoyouareorwhoyouwanttobecome. Youneverknowthesepeoplewhomaybeaclassmateaneighbourorafriend﹣butwhenyoulockyoureyesonthemyouknowatthatverymomenttheywillinfluenceyourlifeinsomeways. Sometimesthingsthathappentoyoumayseemunpleasantpainfulorfrustratingatfirst.Butinanotherwayyoufindthatwithoutgettingoverthosedifficultiesyouwouldhaveneverrealizedyourabilitystrengthorwillpower意志力. Thepeopleyoumeetandthesuccessyougethelptocreatewhoyouareandwhoyoubecome.Eventhebadexperiencescanbelearnedfrom.Infacttheyaresometimesthemostimportantones. Ifsomeonelovesyougivelovebacktotheminthewayyoucannotonlybecausetheyloveyoubutbecauseinawaytheyareteachingyoutoloveandhowtoopenyourheartandeyestothings. Ifsomeonehurtsyouorbreaksyourheartforgive原谅themfortheyhavehelpedyoulearnabouttrustandtheimportanceofbeingcarefulofpeoplearound. Self﹣confidenceisnecessarytoaperson.Ifyou'renotconfidentitwillbehardforotherstobelieveinyou. Learnalessoninlifeeachdayyoulive! 71.Whocaninfluenceyourlifeinsomeways 72.Areunpleasantthingsgoodforyou 73.Whyarebadexperiencesveryimportanttoyou 74.Whatshouldyoudoifsomebodyhurtsyou 75.Whatdoesthewritertrytotellus.
下列做法正确的是
雷雨天气时氮气可逐步转化为硝酸盐．其关键反应为N2+O22NO．该反应属于
如图为某反应的部分微观示意图其中不同的球代表不同种原子．下列说法正确的是
15分WhenyouwereyoungwhorodeyouaroundonthebackofhisbikeWho21soccerandflewkites22withyouintheparkWhohelpedyouwithyourfirstdifficultmathproblemWhotaughtyouthedifferencesbetween23Yourdad.Nowitisyourturntodosomethingforhim.ThisSundayJune16itisFather'sDay.Sowhynotdo24specialtothankyourdadforallhisencouragementandsupport支持 TheideaofFather'sDaycame25anAmericanladycalledSonoraSmartDoddin1909.Shewantedan26daytohonorherfather.Heraisedsixchildrenbyhimself27hiswifediedduringthebirthoftheirsixthchild.Doddthoughtthereneededtobeadaytohonorhercourageous勇敢的selflessandlovingdad.HerfatherwasbornonJune1928shechosetoholdthefirstFather'sDaycelebrationonhisbirthdayin1910.In1924USPresidentCalvinCoolidgelikedtheideaofanationalFather'sDay.Finallyin1966thethirdSundayinJunewasdeclared宣布Father'sDay. Therearemanywaystoshowyourloveandthanks. Sendhimagreetingcard.Usuallyfathersprefercardsthatarenot29emo﹣ tional使人动感情的.Thereforeperhapschooseonethat30himlaugh. Asmallpresentsuchasaphotoofyourfamily31aspecialwallet32makehimfeellikeaking. Sendhim33andtheredroseisthe34giftintheofficeduringFather'sDay. Ifhehasa35coverhisdesktop桌面withwordslikeIloveyoudad! 21.A.played B.bought C.sold D.gave 22.A.quietly B.sadly C.happily D.loudly 23.A.oldandyoung B.bigandsmall C.rightandwrong D.longandshort 24.A.nothing B.something C.everything D.anything 25.A.in B.out C.over D.from 26.A.easy B.unusual C.strange D.attractive 27.A.when B.until C.after D.before 28.A.so B.because C.until D.if 29.A.much B.also C.many D.too 30.A.willmake B.ismaking C.hasmade D.ismade 31.A.but B.or C.yet D.and 32.A.should B.can C.must D.need 33.A.clothes B.books C.flowers D.computers 34.A.morepopular B.muchpopular C.mostpopular D.popularest 35.A.watch B.computer C.car D.bike.
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