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小青在做“动能的大小可能与质量和速度有关的实验”，他让小球沿同一光滑斜面向下运动，与放在水平面上的纸盒相碰，纸盒在水平面上移动一段距离后静止．（1）如图甲所示是探究动能与 的关系实验，得出的结论...
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小伟猜想动能的大小可能与物体质量和运动速度有关于是设计了如图所示的实验让小球沿一光滑斜面向下运动与放
学习了电磁感应现象后我们知道磁能产生电.爱琢磨的小明提出了一个值得探究的问题感应电流的大小与哪些因素
小伟猜想动能的大小可能与物体质量和运动速度有关于是设计了如图所示的实验让小球沿同一光滑斜面向下运动与
在探究重力势能与哪些因素有关的实验中小华猜想A.物体重力势能的大小可能与物体被举高的高度有关B.物体
21.小红猜想动能的大小可能与物体的质量m和运动速度v有关于是设计了如图甲乙所示的实验探究动能的大小
小红同学猜想动能的大小可能与物体质量和运动速度有关于是设计了如图甲乙所示的实验探究动能的大小与那些因
小明小华和小丽利用如图所示的实验装置探究动能的大小与哪些因素有关时小明猜想物体的动能可能与物体的质量
在某次探究活动中小明对老师给出的小球在光滑斜面由静止释放时所处高度越高到达斜面底端的速度越大而与小球
小红猜想动能的大小可能与物体的质量m和运动速度v有关于是设计了如图甲乙所示的实验探究动能的大小与物体
某班同学在探究动能的大小与什么因素有关时同学们提出了如下猜想猜想一动能的大小可能与物体的密度有关猜想
在探究重力势能与哪些因素有关的实验中小华猜想A.物体重力势能的大小可能与物体被举高的高度有关B.物体
小红猜想动能的大小可能与物体的质量m和运动速度v有关于是设计了如图甲乙所示的实验探究动能的大小与物体
李明猜想动能的大小可能与物体质量和运动速度有关于是设计如图甲乙所示的实验探究动能的大小与哪些因素有关
在某次探究活动中小明对老师给出的小球在光滑斜面由静止释放时所处高度越高到达斜面底端的速度越大而与小球
某同学在探究物体动能大小与哪些因素有关的实验中他猜想物体动能大小可能与物体速度大小有关于是他用如图
小红猜想动能的大小可能与物体的质量m和运动速度v有关于是设计了如图甲乙所示的实验探究动能的大小与物体
2012·自贡中考如图是探究物体动能大小与物体的质量速度关系的示意图1在探究动能与速度的关系时要保持
某班同学在探究动能的大小与什么因素有关时同学们提出了如下猜想猜想一动能的大小可能与物体的密度有关猜想
小明同学猜想动能的大小可能与物体质量和运动速度有关于是他设计了如图所示的实验让小球沿同一光滑斜面向下
在的科学探究实验中当要研究的物理量与多个因素有关时通常要采用法.例如在如图所示探究物体动能大小与物体
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现有含HCl和CuCl2的混合溶液50g向该溶液中逐滴加入溶质质量分数为10%的NaOH溶液生成沉淀的质量与加入NaOH溶液的质量关系如图所示． 1当加入NaOH溶液质量为ag时溶液中的溶质有 2求混合溶液中CuCl2的质量分数． 3求恰好完全反应时消耗NaOH溶液的总质量．
我国民间有端午节挂艾草驱虫辟邪的习俗艾草中含有丰富的黄酮素化学式为C15H10O2有很高的药用价值．下列氧化黄酮素的叙述错误的是
化学与我们的生活密切相关 1田里的水稻叶子发黄并倒下了一片你认为应该向稻田施用的复合肥是．填序号下同 A．CONH22B．KClC．Ca3PO42D．KNO3 2人们误食重金属盐如硫酸铜氯化钡等可通过喝大量豆浆的方法解毒．由此可知喝下列物质中的也可以达到同样的目的． ①牛奶②果汁③蛋清④矿泉水⑤食盐水 3无人驾驶汽车处理系统的核心材料是高纯度的硅．工业制硅的反应之一如下 2X+SiCl4＝Si+4HCl．该反应中X的化学式是． 4化学电池在放电时发生化学变化由能转化为能． 5煤燃烧产生的某种气体是形成酸雨的主要原因在煤中加入可以减少其的排放．
Themostimportantthingtokeepinmindwhendealingwithan紧急情况istostaycalm.
有科学家研究发现氧气可通过高能真空紫外线照射二氧化碳直接产生该化学反应模型如图所示关于该反应的说法错误的是
同学们为了制作叶脉书签需要配制400g10%的NaOH溶液． l计算需要称取NaOH的质量g量取水mL． 2将洗净的树叶放在配制好的溶液中煮沸一段时间后取出称量发现溶液的质量减少了200g溶质质量分数也有所减小．然后在剩下的溶液中加入CuSO4溶液直到不再产生沉淀为止向溶液中逐渐加入了16%的CuSO4溶液200克．计算 ①煮沸后剩下溶液中NaOH的质量分数． ②加入CuSO4溶液后刚好完全反应时溶液中溶质的质量分数． 1只需填答案2要求写出计算过程精确到0.1%
如图是关于氧气化学性质的部分知识网络关于该图说法正确的是
下列四个图象能正确反映实验变化关系的有
类推是一种重要的学习方法但如果不具体问题具体分析就会产生错误的结论．下列类推结论错误的是 ①CO能与Fe2O3反应生成FeCO也能与CuO反应生成Cu ②NaOH溶液能使无色酚酞试液变红色CuOH2也能使无色酚酞试液变红色 ③有机化合物含碳元素则含碳元素的化合物一定是有机化合物 ④溶液是均一稳定的则均一稳定的液体一定是溶液 ⑤碱溶液呈碱性能使无色酚酞变红则呈碱性的溶液一定是碱溶液．
在“①石墨②熟石灰③石灰石④维生素C⑤食醋⑥甲烷”中选择适当的物质填空用番号填空 1缺乏会引起坏血病． 2用于改良酸性土壤的是． 3可用于检验鸡蛋壳中含有碳酸盐的是． 4沼气的主要成分是．
如图是硫酸钠和氯化钠的溶解度曲线下列说法正确的是
假如你是李华请按如下提示给酷爱中国书法的外教Mr.Smith写一封信邀请对方参加你校举办的书法展calligraphyexhibition. 1.展出时间2019年10月8日﹣12日 2.展出地点学生活动中心5楼 3.展出作品300多幅师生作品 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
欲除去NaOH溶液中的少量Na2CO3不增加新的杂质．下列药品选用和除杂操作中正确的是
TwoofthesaddestwordsintheEnglishlanguageareifonly.Ilivemylifewiththegoalofneverhavingtosaythosewordsbecausetheyconveyregretlostopportunitiesmistakesanddisappointment. MyfatherisfamousinourfamilyforsayingTaketheextraminutetodoitright.Ialwaystrytolivebytheextraminuterule.WhenmychildrenwereyoungandlikelytocauseaccidentsIalwaysthoughtaboutwhatIcoulddotoavoidanifonlymomentwhetheritwassomethingminorlikemovingacupfullofhotcoffeeawayfromtheedgeofacounterorsomethingthatrequiredalittlemoreworksuchastapingpadding衬垫ontothesharpcornersofaglasscoffeetable. Idon'tonlyavoidthoseifonlymomentswhenitcomestosafety.It'sequallyimportanttoavoidifonlyinourpersonalrelationships.WeallknowpeoplewholostalovedoneandregrettedthattheyhadlostanopportunitytosayIloveyouorIforgiveyou.WhenmyfatherannouncedhewasgoingtotheeyedoctoracrossfrommyofficeonGoodFridayItoldhimthatitwasaholidayformycompanyandIwouldn'tbethere.ButthenIthoughtaboutthefactthathe's84yearsoldandIrealizedthatIshouldn'tgiveupanopportunitytoseehim.IcalledhimandtoldhimIhaddecidedtogotoworkonmydayoffafterall. IknowtherewillstillbeoccasionswhenIhavetosayifonlyaboutsomethingbutmylifeisdefinitelybetterbecauseofmypolicyofdoingeverythingpossibletoavoidthateventuality不测的事.AndeventhoughittakesanextraminutetodosomethingrightoritoccasionallytakesanhourortwoinmybusyscheduletomakeapersonalconnectionIknowthatI'mdoingtherightthing.I'mbuyingmyselfpeaceofmindandthat'sthebestkindofinsuranceformyemotionalwell﹣being. 1Whichofthefollowingisanexampleoftheextraminuterule? A.Startthecarthemomenteveryoneisseated. B.Leavetheroomforaminutewiththeironworking. C.Waitforanextraminutesothatthesteaktastesbetter. D.Moveanobjectoutofthewaybeforeitletssomeonefalldown. 2WhydidtheauthordecidetogotoherofficeonGoodFriday? A.Tokeepherappointmentwiththeeyedoctor. B.Tomeetherfatherwhowasalreadyanoldman. C.Tojoinintheholidaycelebrationofthecompany. D.Tofinishherworkbeforethedeadline. 3Whatcanweinferfromthepassage? A.Itisthemostimportantthingtoavoidifonlyinourdailylife. B.Theauthormusthaveagoodrelationshipwithherchildren. C.Weshouldbuyinsurancetomakeourlifebetter. D.Avoidingifonlycanmaketheauthorcomfortable. 4Whatisthebesttitleforthepassage? A.TheEmotionalWell﹣being. B.TheTwoSaddestWords. C.TheMostUsefulRule. D.ThePeaceofMind.
Whileastronautsinspacegettodomanyexcitingthingstheymissoutonordinarythingsthatwealltakeforgranted﹣beingabletowalkonfirmgroundhangingoutwithfamilyanddiggingintoasliceofhotsteamingpizza.Thoughnotmuchcanbedoneaboutthefirsttwothingstheremaysoonbeasolutiontothethirdonethankstothiscool3﹣Dpizzaprinter! AboutayearagoNASAoffered﹩125000toAnjanContractora3﹣Dtechnologyexperttobuildadevicethatwouldallowastronautstomakepizzaondemand.Themechanicalengineerpromisedthathisinventionwouldproducepiesinlargequantitiesthatlookedtastedandevensmelledlikepizzamadeincommonovens. Latelastyeartheengineerpresentedavideoofhisfirstprototype原型thatbeginsbycreatingasinglesliceofdough面团thatiscookedandprintedatthesametime.Thencomesthetomatosauce﹣amixoftomatopowderoilandwaterandfinallyaproteinslicethatresemblescheese.Whilethevideodoesn'tshowthebakingprocesstheinventorsaysthatoncethepizzaisprinteditcanbereadytobeconsumed消耗in7seconds. WhilethepieinthevideolooksdeliciousenoughtoattractanypizzaloverAnjanContractorisfarfromreadyforastronauts.That'sbecausehestillhastofindasolutiontomakethefoodcontainerintheprinterlastfor30years.Thoughthatmaysoundunrealisticactuallyitisnot.AnjanContractorbelievesthattheonlywaythatispossibleisthatthewaterisremovedfromalltheingredientsandthentheyarereducedtothepowderform.Thisasyoucanimaginewillnotbesoeasy.Butwhiletheprintermaynotbereadyforspaceitcertainlylooksreadyenoughforpeopleonearth.HopefullyNASAandContractorwillconsidersellingittothosenotfortunateenoughtogotoMars! 1Whydoestheauthormentionthethingsthatastronautsinspacecannotdo? A.Toaskusnottotakecommonthingsforgranted. B.Toshowtheyliveadifficultlifethere. C.Toshowtheirlifeisboringinspace. D.Tointroducethetopicofthetext. 2NASAoffered﹩125000toAnjanContractormainlyto. A.createsomenewtypeof3﹣Dprinter B.attractmorecompaniestoworkforNASA C.helpastronautsinspaceenjoyfreshpizzaoneday D.producepizzainlargequantitiestoearngreatprofits 3ThebiggestchallengethatAnjanContractorisfacedwithnowisprobablythat. A.hehasnomoneylefttogoonwithhisresearch B.thepizzadoesn'tseemappetizingtopizzalovers C.hehasnowaytomakepizzathatcanlastforthirtyyears D.hecannotmakethefoodcontainerlastfordecades 4What'sthebesttitleofthepassage? A.NASAistryingitsbesttohelpastronautseatbetter B.Astronautsmaysoonbeabletoenjoysteaminghotpizza C.NASAisworkingonmakingpizzaforcommonpeople D.A3﹣Dpizzaprinterhasbeenusedtomakepizza
Themoonhadgonebehindacloudandthereweren'tmanystarsinthesky.AsItookaglance一瞥atmyneighbor'shouseIsawaflame火焰inhis1.IthoughthewashavingamidnightfastfoodsoIwentbacktomy2. Soontherewasa3smellintheairandIguessedsomethingwaswrong.4Ijumpedoutofbedandwentdownstairsto5.Isawfirecomingoutofmyneighbour'skitchen.RightawayI6Fire!Fire!Buttherewasnoonenearbyto7myshoutsforhelp. I8intomyhousecalledtheFireDepartmentandwentbacktomyneighbour'shouse.Irangthedoorbellhitonthedoorand9myneighbour'snamebuttherewasno10.Imanagedto11thehouseandrescuedacatandarabbit. Itriedtothrowwaterthroughthekitchenwindow12itwasnousethefirewastoostrong.13afireenginearrivedandsoonthefiremenputoutthefire.Theyarrivedjust14asthefirewasgoingto15totheotherroomsinthehouse. Whenmyneighbourcamebackhewas16becausehiskitchenwasburntdownbuthethankedmeforcallingtheFireDepartmentandforsavinghis17.HewantedtogivemesomemoneyinreturnbutIdidnot18it. Weekslatermyneighbourrepairedandrestoredhiskitchen.He19metoseehisnewkitchenandtherehegavemeamedal奖章thathehad20orderedfromafactory.Itmademefeelveryhappy. 1A.sittingroom B.bathroom C.kitchen D.bedroom 2A.chair B.table C.bed D.sofa 3A.big B.hot C.special D.burning 4A.Afterawhile B.Allthetime C.Onceinawhile D.Atonce 5A.examine B.search C.listen D.smell 6A.said B.shouted C.received D.smiled 7A.hear B.listento C.ask D.turnto 8A.walked B.rushed C.jumped D.stepped 9A.calledin B.calledup C.calledout D.calledfor 10A.answer B.light C.sound D.fire 11A.takeout B.takeup C.breakdown D.breakinto 12A.and B.but C.because D.so 13A.Luckily B.Sadly C.Unfortunately D.Suddenly 14A.intime B.ontime C.atatime D.attimes 15A.run B.spread C.flow D.return 16A.glad B.sad C.sick D.angry 17A.children B.parents C.life D.pets 18A.expect B.want C.accept D.get 19A.ordered B.begged C.advised D.invited 20A.mainly B.particularly C.specially D.naturally
IdeastoMakeYourSchoolaGreenCampus Universitiesaredoingeverythingtheycantobecomeagreencampus.Buttherearealsoitemsstudentscandotomakeyourcampusmoreeco﹣friendly. Recycleeverythingespeciallypaper! Thereisalargeamountofpaperacollegestudentgoesthroughpersemester.1Weknowthatthesethingscan'tbeavoidedbutthewayyouhandletheuseofallthepapercanreallyhelpcreateabettergreencampus. Buygreen. 2Papercleaningproductsandwaterareproductsthatcanbepurchased购买asrecycledgoods.They'reslightlymoreexpensivethanthenormalproductsbutit'sworthittomakeagreencampus. Walkandbiketoschool. Mostcampusesespeciallythosethataretryingtobecomeamoreeco﹣friendlycampushaveprettygoodpublictransit.3Walkingorbikingwillhelpmakeyourcampusagreenuniversity. 4 Awaterbottlecanberefilledatanywaterfountainandcaneasilybedrankinclassorwhileridingabike.Thiswillsavetheenvironmentbydecreasingtheamountofplasticwasteonyourcampus. Buyusedclothing. Itisusuallythoughtofassomethingtodotosavemoney.5Recyclingclothesminimizetheuseofresourcestomakeclothingandputsadentintheproblemofworldwidesweatshops. A.Carryawaterbottle. B.Itisalsogoodfortheenvironment! C.Buyrecycledgoodsasmuchaspossible. D.Papermadeofthiskindwoodismuchstronger. E.Ontopofthatalmostalluniversitiesarepedestrian行人friendly. F.Itincludesclassnotestermpapersstudentnewspapersandsoon. G.Universitiescallonallthestudentstolearntorecycleallthewastepaper.
The10thannualInternationalGoSkateboardingDaywillbeheldonJune212012.SkateboardingDayisallaboutfun!Hereisyourguidetosomeoftheeventsaroundtheworld. LosAngelesCalifornia Over10000skateboardersfromaroundtheworldwillgatherinthestreetsofL.A.TheyhavepartneredwithBoardsforBrosanonprofitorganizationthatcollectsandrestores修复skateboardsforchildrenwhocannotaffordtheirownandhaveaskedskateboardersacrosstheUStodonatetheirusedskateboardproducts.Thecelebrationwilllastmostofthedaytime. ManilaPhilippines TheSkateboardingDaytobeheldinthePhilippineswillbeintheManilaforthesecondtime.Manilaishopingtopromotehealthandskateboardingsports.Theeventbeginsat200pmandendsat600pm.TheskateboardersstartfromLiwasangBonifaciowheretheycanskateinthestreetsofP.BurgosRoxasBoulevardanduptoMalatefountaininRajahSolimanParkwheretheeventendswithaProductTossandBestTrickcontest. SylvanLakeAlbertaCanada IfyouhappentobeinAlbertaCanadaandtheweatherisn'tgreatforoutdoorskatingInclineSkate&BMXParkistheplacetogoskateboarding.Inclineisagreatplacetoskateandadaypassthereisonly﹩8foranadulthalfforthosebelow16.OnGoSkateboardingDaytheywillholdacompetitionwiththefirstprizewinnertakinghome﹩600. NewYorkCityNewYork SteveRodriguezownerandfounderofSBoroSkateboardsholdsthebiggestchapteroftheSkateboardingDayintheworld.TensofthousandsofpeoplewillparticipateandJune21stisnowanofficialNewYorkCityholiday.Theeventstartsat10amandendsat6pm.Therewillbeafreeclinicat10amtonsofprizesfoodanddrinks.Fordetailsofthefulldaypleasecheckouthttp://www.Sboro.com. 1ItcanbelearnedthattheBoardsforBrosaimsto. A.provideskateboardsforpoorchildren B.collectusedskateboardproductstothefestival C.searchforcompetitorsforthefestivaleveryyear D.restoreskateboardsonlyforthecompetitors 2Howmuchwilltheypayifacouplewiththeir14﹣year﹣oldchildskateinIncline? A.Eightdollars. B.Twelvedollars. C.Sixteendollars. D.Twentydollars. 3Wherewilltheeventorcelebrationlasttheshortest? A.InManilaPhilippines. B.InLosAngelesCalifornia. C.InSylvanLakeAlbertaCanada. D.InNewYorkCityNewYork.
不用其它试剂鉴别下列5种物质的溶液①H2SO4②FeCl3③BaOH2④KCl⑤BaCl2被鉴别出物质的顺序是
“低碳生活”是指生活中所耗用的能量材料要尽量减少从而减低二氧化碳的排放量．下列做法不符合“低碳生活”理念的是
MaryAnningwasanEnglishfossil化石collectordealerandpaleontologist古生物学家.Herfossil﹣huntinghelpedchangethewaypeoplethoughtabouttheworld. MarywasbornintoapoorfamilyinEnglandonMay211799.ShelivedintheseasidetownofLymeRegisinDorset.Thefamilyhadninechildren.OnlyMaryandherbrotherJosephgrewup.Mary'sfathertookhischildrenalongthebeach.Theypickedupshellsandstonestoselltovisitors.Marydidnotgotoschoolmuch.Herfamilywastoopoor.Andschoolsdidnotteachchildrenaboutfossils.Marycouldreadandwrite.Shetaughtherself.Shelearnedaboutrocksandhowbodiesaremade. In1811whenMaryandJosephwerefossilhuntingJosephsawabonestickingoutoftherock.Maryhadahammertochipawayattherock.Verycarefullysheuncoveredit.Shefoundthefirstcompletefossiloftheichthyosaur鱼龙. SincethenMarybecamecrazyaboutfossilhunting.Shelikedtohuntonthebeachafterastorm.Thewindrainandwavesmadetherockscrumble.Itwaseasytospotfossils.MostdaysMarywentfossilhuntingwithherdogTray. RichfriendshelpedMarybysellingfossilsforher.Theysenthermoney.Scientistswrotelettersandcametoseeher.OnegoodfriendwasWilliamBucklandaprofessoratOxfordUniversity.Maryalsoopenedashoptosellfossilsstonesandshells.Shechattedwithvisitors. MaryAnningdiedin1847.Howevolution进化workswasexplainedbyCharlesDarwinnotlongafterMarydied.Herfossilshadhelpedscientistsunderstandhowthingsbegan. 1WhydidMary'sfathertakehischildrenalongthebeach? A.Toenjoylife. B.Tomakealiving. C.Tolookforfossils. D.Toteachthemaboutfossils. 2WhatcanwelearnaboutMary? A.Herfatherwasapaleontologist. B.Herfathereducatedherathome. C.Shehadninebrothersandsistersinall. D.Shemightbepopularatthattime. 3Whowasthefirstonetocatchsightoftherockcontainingthefirstcompleteichthyosaurfossil? A.CharlesDarwin. B.Mary'sdog. C.Joseph. D.Mary. 4Whatdoestheunderlinedwordcrumbleinthefourthparagraphmeans? A.break B.shake C.float D.dive
某工厂的工业废水中含有大量的FeSO4以及一定量的CuSO4和Na2SO4为减少污染并变废为宝某学习小组设计以下流程拟从该废水中回收硫酸亚铁金属铜并利用氨碱法原理“制碱”．除标注外所加药品或试剂均过量部分产物及反应条件略去 回答下列问题 1由步骤①可知FeCu的活泼性由强到弱的顺序是． 2若向步骤②所得的滤液中滴加1～2滴紫色石蕊试液溶液是． 3步骤⑤中加Na2CO3溶液的作用是．由NaHCO3转化成纯碱的化学反应方程式为． 4“NaCl+CO2+NH3+H2O＝NaHCO3+NH4Cl”是氨碱法制纯碱中的重要反应．下列叙述正确的是． A．析出晶体后剩余溶液中只有一种溶质 B．该条件下NaHCO3的溶解度比NH4Cl的大 C．析出晶体后的溶液为NaHCO3的不饱和溶液 D．在加压条件下向饱和氨盐水中通入CO2能加速NaHCO3的生成 5该流程①～⑥中发生了复分解反应的有．填写步骤编号
MarkTwainwasa幽默的writerandhiworksalwaysmakereaderslaugh.
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. It'stimeforustograduate.BeforepartingourclassisgoingtoholdthelastclassmeetingwhichthemewillbethePastGoldenDays.Weplantohaveseveralactivitiestobringaunforgettableendingtoourbeautifuldays.Firstlywewillwatchthephotostakeduringthethreeyearsespecialaboutourschoolevents.Itwillsurelymakeeveryonetorecallthosepreciousmoments.Thenwe'llextendoursinceregratitudetoourteachers.Itisthemwhogivewithoutaskinganythingforreturn.Thencameoneofthemostimportantmomentinourlife﹣﹣abigparty.InawordIhopethelastclassmeetingwillmeaningful.
现有50g溶质质量分数为10%的氢氧化钠溶液加入50g溶质质量分数为10%的硫酸铜溶液充分反应过滤除去沉淀所得溶液中含有离子是
Lastweekinanunusualwayastrangertreatedmewithgenerosity.AtanAsiangrocerystoreonabusyeveningIwasshoppingfortheitemsIneeded1myvoluntaryworkofcookingbreakfastonSaturdayatashelterforthehomelessinSanJose.Iwenttothestore2buytofuandvegetables.AsI3waitinlinetofinishthepurchasetheladynexttomeapproachedmetofindout4IwasgoingtoconsumethebigboxoftofuIwasbuying.EnthusiasticallyIrepliedthatIwasbuyingfoodtocookbreakfastforhomelesspeople. WhileIwasgettingreadytopaythebilltomy5amazesheofferedtopayforeverything.Despitemultiplerequestsfor6namesherespondedthatshefeltgoodbecauseIwasdoingthekindofcommunityworkwhichherparentsoncereceivedhelpfrom7theycametothiscountryasrefugees.Henceshewantedtotake8opportunitytoshowhergratitude. Itwasthe9goodrewardIhadeverreceivedformyvoluntarywork10beganthreeyearsago.Inastrangewayweareallconnectedandwefeelgratefulforeachother.
如图是关于氧气的制取与性质实验装置图．回答下列问题 1装置中标有符号a的仪器名称是A装置用于制取氧气写出瓶中发生的化学方程式 2装置D的作用是． 3装置C中硫粉点燃后的现象是产生色火焰．
学习化学最重要的是善于用化学知识去分析解决生产生活中的问题．从化学的角度看下列说法中正确的是
1若核电荷数为16的元素的符号为R则粒子可用离子符号来表示R元素的原子最外层电子数为． 2铁元素是组成人体血红蛋白的重要元素市场上有含少量铁粉的营养麦片在人体胃液中与盐酸反应转化成可吸收的亚铁盐从而达到补铁的目的写出铁粉在胃液中发生的化学方程式铁元素在生成物中的化合价是．
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.错误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. DisappointingattheresultoftheexaminationIsatonthesofainsilentafterschool.MyfatherhefoundIwassounhappycometoaskmewhy.Afterlearningthereasonmyfathergavemeasmile.HesaidDon'tallowtheterriblythingsinyourlifetodiscountthepositiveones.Don'tletabaddayormonthoryeartomakeyoufeellikeyouhaveabadlifeinsteadfocusingoneverythingthat'sgoingwrongstartholdingontoallofthethingsthatisgoingright.You'llfeelbettersoon.HeardwhatmyfathersaidIfeltittheshametoactlikethatanddecidedtocheermyselfup.
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