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某同学配制50g6%的氯化钠溶液整个操作过程中如图所示回答下列问题 1配制溶液的正确操作顺序为填序号下同其中操作错误的是． 2图②中盛放氯化钠固体的仪器名称是需称取氯化钠g． 3量水时选用的量筒的量程最合适的是填序号读数时视线要与量筒内保持水平． A.10mLB.25mLC.50mLD.100mL 4取上述溶液10g加水g可稀释得到3%的NaCl溶液． 5若该同学配制的溶液溶质质量分数偏小可能的原因是填序号． A．氯化钠固体不纯B．用生锈砝码称量 C．装瓶时有少量溶液洒出D．溶解前烧杯内有少量水
下列实物富含糖类的是
ThemanwhowalkedintoDaveCutlip'stattooparlor纹身店inBrooklynPark.MarylandinJanuarywastoughtomiss.Hisfaceboreagang帮派tattoo.ThemansoughtCutlip'shelpincoveringuphisviolentpast.Hewasdeterminedtoturnoveranewleaf.IcouldseethehurtinhiseyesCutlip49toldTheWashingtonPost. Cutlipcouldn'thelptheman﹣thetattooweretooclosetotheeyes.Butitgothimthinking.Manyyoungpeoplegettattoosthatheycometoregret.Afewcanmarkthemfortherestoftheirdays.Thenthey'realwaysgoingtobeavictim.saidCutlip.IfIcanhelpthat'smyultimate最终的goal. Inkingoveratattoocostshundredsofdollarsandgettingoneremovedbylaser激光isevenpricier.SoCutlipdecidedhewouldhelpbyhidingracistorgang﹣relatedtattoosforfree.HeputthewordoutviaFacebook:Sometimespeoplemakebadchoicesandsometimespeoplechange.Webelievethereisenoughhateinthisworldandwewanttomakeadifference. OnemanCaseySchaffershowedupwiththewordwhiteononeforearmandpowerontheother.He'dservedayearinprisonondrugchargeshetoldTheWashingtonPostandhadjoinedawhitegrouptherebecausetheytookcareofme.Ithoughtofitaspayingthemback.Butemployerswouldtakeonelookatthetattoosandturnhimdown.SohehadCutlipobscure使不分明oneofthewordswithaheatandrosesandtattooaneagleovertheother. Cutliphasdoneninesuchjobseachofwhichtookseveralhours.HetoldPeoplethataclient顾客lethimknowthathequicklyfoundajoboncehistattoowasobscured.SuchvictoriesinspiredCutliptofoundtheRandomActsofTattooprojectwiththreelike﹣minded志同道合的tattoostudiosfromaroundthecountryandnowhundredsofclientsareonawaitlist.AshetoldNationalPublicRadio.Ifwecanjusterasehatethenwe'redoingsomething. 1Whatdoweknowaboutthemanwhohadagangtattoo? A.Hiseyeswerebadlyhurt. B.HerefusedCutlip'shelp. C.Tattooscoveredallofhisbody. D.Hedecidedtostartalloveragain. 2HowdidCutliphelpCasey? A.Bycoloringthetattoos. B.Byinkingoverthetattoos. C.Bychangingthetattoos'patterns. D.Byremovingthetattoosbylaser. 3WhydidCaseyaskCutlipforhelp? A.Togetemployed. B.Tojoinanothergroup. C.Tohidehisangeratwhites. D.Topleasehiscurrentemployer. 4WhatcanbeinferredabouttheRandomActsofTattooproject? A.It'saworldwideproject. B.It'saco﹣foundedproject. C.Itsclientsarelike﹣minded. D.Itsclientsdon'thavetowaitlong.
要使如图装置中的小气球鼓起来则使用的固体和液体可以是 ①石灰石和稀盐酸②镁和稀硫酸③固体氢氧化钠和水④生石灰和水．
下列做法不正确的是
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.每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. Iknowthatthelibraryisawonderfulthingbutsomethingwereallyshouldtakeadvantageof.Igotothelibrarynearmyhomeatleasttwiceofaweekinthepast.Howeverbecauseofmyextremebusyscheduleithasbeenmorethantwoyearsincemylastlibraryvisit.HowImissthedaysIspentinthelibraryreadthebooksIloved!Asyouknowthereisnofriendsofaithfullyasagoodbook.Idoenjoythequietatmosphereinthelibrarywhichmakesmeabsorbinginmyreading.ThisistimethatIwenttothelibrary.Ifyoufondofreadingbeafrequentvisitortothelibrary.
SooftenIhearpeoplejustifytheirlackoffamilytripsbecausetheirchildrenarenotoldenoughtorememberthem.Thisreasonissoconfusingtome.Whowouldtravelbasedonanotherperson'smemory? Ofcoursethekidsaren'tgoingtorememberanythingininfancy婴儿期butyouwill.Youwillrememberallthesweetmemoriesyouhadwiththem. MyparentswouldtakemetoGuatemalaasachild.Idon'trememberalotaboutthetripbutIdoknowthatwhenIwentbackasayoungadultIfeltcomfortableinmysurroundings.Ididn'tspendmytimetherediscoveringanewwayoflife.Ispentthetimehavingfunwithmyfamily.IlovelookingatpicturesthatwetooktogetherwhenIwasmyson'sage.Idon'trememberthembutthat'snotthepoint.ThepointisIwastherewithmyfamilyandIknowIwashappy. NowthatI'maparentIcan'thelpbutdothesame.Lastyearwetookour2﹣year﹣oldsontoDisneyalongsidehisgreat﹣grandmother.Hisgreat﹣grandmotherhadrecentlybeguntosufferfromAlzheimer's.Thattripwastimedinthemostmagicalway﹣rightbeforemysonwasoldenoughtorememberitandrightbeforehisgreat﹣grandmotherbegantoforget.Thismakesmewanttocryforthemboth.Howdidwegetsoluckytohavethismomenttosharewitheachotherbeforebigchangesinfluencedourfamilyforever? Realisticallyspeakingmanyfamiliesdonothavetheopportunitytotravelinternationallyorvisitpriceythemeparks.IunderstandthismorethanyouknowbutI'mtalkingbeyondthat.Theyareyoungbuttheseforgettablemomentsarestillchangingthem.Theywillshapeyourchildrenintowhotheywillbetomorrow.Thememoriesweabsorbastheirparentsarealsoasinfluentialaswehavenotfinishedlearningourtruthseither. 1Whydosomeparentsgoonfewfamilytrips? A.Theyhavenotime. B.Theycannotaffordthem. C.Theyarenotinterestedinthem. D.Theythinktheirkidswon'trememberthem. 2What'stheauthor'simpressionofherchildhoodtriptoGuatemala? A.Clear. B.Boring. C.Pleasing. D.Hard. 3WhichinfluencedtheauthortoplantheDisneytrip? A.Herson. B.Herparents. C.Someoldphotos. D.Otherparents'ideas. 4WhydidtheauthorwanttocrywhenrecallingtheDisneytrip? A.Shewassorryforhergrandmother'sdisease. B.Shewasworriedaboutbigfamilychanges. C.Shewasmovedbythetimingofthetrip. D.Shewassurprisedbyherson'sgrowth.
写出下列反应的化学方程式并注明反应的基本类型． 1实验室用高锰酸钾制取氧气 2红磷在空气中燃烧． 3服用含氢氧化镁的药物中和过多胃酸．
氢氧化钙的溶解度随温度升高而减小．要想把一瓶接近饱和的石灰水变成饱和具体措施有 ①加入氢氧化钙②升高温度③降低温度④加入水⑤恒温蒸发水．其中措施正确的是
Teenageprodigy天才KylianMbappéisontopofthesoccerworldafterhelpingFrancewinthe2018FifaWorldCup20yearsaftertheironlypreviousvictory. KylianMbappégrewupinthenorthernParisiansuburb巴黎郊区ofBondyandpracticallylivedatthelocalsoccerclubwhereprofessionalssaidhewasastarfromdayone. KylianMbappéhelpedFrancewintheirsecondWorldCuptitleyesterdayscoringthefourthgoalforLesBleusintheir4﹣2winoverCroatiainMoscow'sLuzhnikiStadium.Itwasoneoffourgoalstheyoungstarscoredinthe2018WorldCupforFrance.MbappéalsoledFrancetotheirearlyvictoryoverPeru1﹣0andscoredtwiceagainstArgentinainthequarter﹣finals. Somesoccerfansarejustgettingtoknowthe19﹣year﹣oldbutMbappéhashadanimpressivecareersincehewasababy.GrowingupinthenorthernParisiansuburbofBondyMbappépracticallylivedatthelocalsoccerclubwhereprofessionalsbelievedhewasastarfromdayone. FormercoachAntonioRiccardisaysMbappéwasalreadyheadandshouldersaboveotherchildrenwhenhestartedworkingwithhimattheageofsix.KyliancoulddomuchmorethantheotherchildrenRiccardisays. Hisdribbling运球wasalreadyfantasticandhewasmuchfasterthantheothers. Bytheageof12MbappéwastrainingatFrance'seliteClairefontainefootballcentre.At14hewasplayingwithMonaco'sprofessionalclubevenbeforehecompletedhishighschooldiplomaat17. Mbappébecamethesoccerworld'smostexpensiveteenagerthissummerwhenPSGactivatedaclausetomakehisloanmovefromMonacopermanentforareported€180millionnearlyUS$210.4million.HespentthepastseasonatPSGonloanpriortothetransfertakingeffect. HemadehistoryyesterdaywhenhebecamejustoneoftwoteenageplayerstoscoreinaWorldCupfinal.TheotherBrazil'sPeléplayedinthe1958finalwhenhewas17.Thesoccerlegendtookyesterday'snewsinhisstride.IfKyliankeepsequallingmyrecordslikethisImayhavetodustmybootsoffagainhetweeted. Mbappésaysyesterday'sWorldCuptriumphisonlythebeginning. Iwanttodoevenbetterthingshesays.Butbeingworldchampionisagoodstart. 1HowmanygoalsdidKylianMbappéscoreforLesBleusintheirwinagainstCroatia? A.1 B.2 C.3 D.4 2FromthesentenceMbappéwasalreadyheadandshouldersaboveotherchildrenwecanlearnthat A.Mbappéwasmuchtallerthanotherchildren. B.Mbappéfeltsuperiortootherchildren. C.Mbappéwasmuchbetterthanotherkidsintermsofskills. D.Mbappélikedtobullyotherchildren. 3FromPelé'stwitterIfKyliankeepsequallingmyrecordslikethisImayhavetodustmybootsoffagainwecanseehisattitudetowardsMbappéis. A.mean B.humorous C.proud D.jealous
水是人类宝贵的自然资源根据水的相关知识回答下列问题 1日常生活中常用来区分硬水和软水． 2生活中常用方法降低自来水的硬度． 3在洗碗时常加入洗涤剂利用了洗涤剂的作用． 4水是由元素组成的电解水的化学方程式是．
ABCDEFG是教案备课库常见的物质A是赤铁矿的主要成分BD组成元素相同E是最轻的气体根据图中相互转化关系回答下列问题部分反应物生成物反应条件已略去． 1写出CG的化学式CG． 2写出有关反应的化学方程式 ①②．
TomillionsofreadersJeffZaslowwasabestsellingauthor.ButtomeJeffwasaa1mentor导师whogavecountlesshoursofhistimeandenergyto2authors. WhenIwasinmiddleschoolJeffandhisfamily3nearourhouse.AtaneighborhoodpartyIwasa4kidplayingbasketballalone.Jeffwalkedoverintroducedhimselftome.Hetookatrueinterestingettingto5measkingaboutmyhobbies.AlthoughwehadjustmetIhadthe6thatthisnewneighbortrulycaredaboutme. LookingbackJeffwasthefirstadultwho7melikeapeer同龄人andithelpedmefindmyconfidence.AtthetimeIhadno8thatJeffwouldbecomeamentortomeorthatIwouldenterthewriting9. TwentyyearslaterIdecidedto10myfirstbook.Insearchof11ondevelopingaplanI12toJeff.Lessthanthreehourslaterhis13landedinmymailbox.Heinvitedmetocallhimanytimedayornight.Heaskedme14questionsandlistenedtomyresponses. WhenIstartedwritingI15Jeff'sworkasamodelandhispersonalexampleasareminderofwhatitmeanttoputotherpeoplefirst. In2012beforeIfinishedwilingmybookJefflosthis16inacaraccident.Imissedthe17totellhimwhataninfluencehehadonme﹣notonlyasawriterbutasarolemodelforhowtoliveagoodlife. JeffZaslownevergotthechancetogivehislast18.Idon'tknowwhathewouldhave19butIknowhowhewouldhavemadeyou20duringthetalk.Hewouldhaveamusedyouwithhumorandencouragedyoutoseekforthemostmeaningfulmomentsinlife. 1A.devoted B.honest C.strict D.fair 2A.help B.choose C.find D.train 3A.camped B.traveled C.moved D.returned 4A.curious B.shy C.stubborn D.clever 5A.invite B.know C.please D.trick 6A.fear B.concern C.suggestion D.sense 7A.treated B.shaped C.served D.accepted 8A.doubt B.idea C.plan D.impression 9A.system B.school C.profession D.class 10A.collect B.write C.publish D.sell 11A.decisions B.judgments C.guidance D.influence 12A.reachedout B.explained C.gavein D.came 13A.book B.name C.reply D.refusal 14A.difficult B.personal C.embarrassing D.thoughtful 15A.reliedon B.figuredout C.dealtwith D.paidfor 16A.eye B.leg C.family D.life 17A.opportunity B.ability C.deadline D.point 18A.performance B.description C.lecture D.lesson 19A.learned B.realized C.expected D.said 20A.feel B.grow C.behave D.continue
经研究证明中学化学实验所用的酒精灯使用浓度为80%的酒精最佳如果酒精浓度过大大于95%易烧焦灯芯过小低于40%酒精灯易熄灭．请你用所学的化学知识解释产生上述现象的原因．
某花圃所种的花卉缺乏氮元素和钾元素如果只施用一种化肥则应施用的是
2016年10月17日7时30分搭载神舟十一号载人飞船的长征二号F遥十一运载火箭在酒泉卫星发射中心点火发射火箭主要燃料是偏二甲肼化学式为C2H8N2．下列有关偏二甲肼组成的叙述正确的是
PerhapstheonlytestscorethatIrememberisthe55IgotwhenIwasinhighschool. Thetestwasthefinalforacourse.Irememberwaiting1asmyteacherMr.Rightpassedoutourpapersonebyone.Itwasarather2test.Iheardmyclassmatesgroaning叹息andIcouldtellbythegroansthatthescoresweren'tlooking3. Mr.Rightputmypaperonmydesk.Thereinbigrednumberscircledtodraw4wasmyscore55! Iloweredmyheadand5thescoreupquickly.A55isnotsomethingthatyouwantedyourclassmatestosee.Thescoreswerenotverygoodnoneofyou6Mr.Rightsaid.Thehighestscoreintheclasswasa55. A55.That'sme! 7mysadlookdidn'tlooksobad.Ihadthehighestscore.Ifeltalotbetter. Iwalkedhomealonethatdaywiththelowbuthighscore.MyfatherknewthatIhadabig8thatdayandaskedmeassoonasIgothome9didyoudoinyourtest? Igot55Isaid. A10nowstoodonmyfather'sface.IknewIhadto11immediately.ButDadIhadthehighestscoreintheclassI12stated.Ithoughtthatexplanationwouldmakeadifference. You13!myfatherreplied.Butit'sthehighest!I14. Idon't15whatscoresothershadyoufailed.What16iswhatyoudo!Myfatherfirmly坚定地said. Foryearsmyfatherwas17thatway.Itdidn'tmatterwhatothersdiditonlymatteredwhatIdidandthatIdidit18. Weoftendon'tunderstandthe19ofgoodparentsuntilweourselvesstandintheparents'shoes.Myfather's20havecarriedmethroughoutlife. 1A.anxiously B.proudly C.shyly D.tiredly 2A.boring B.difficult C.strange D.interesting 3A.poor B.true C.good D.suitable 4A.attention B.interest C.opinions D.lessons 5A.checked B.covered C.turned D.tore 6A.failed B.missed C.passed D.won 7A.Hurriedly B.Finally C.Suddenly D.Slowly 8A.event B.issue C.show D.test 9A.When B.Why C.What D.How 10A.tear B.frown C.panic D.smile 11A.insist B.explain C.prove D.admit 12A.impatiently B.embarrassedly C.nervously D.proudly 13A.cared B.failed C.regretted D.lost 14A.advised B.insisted C.realized D.promised 15A.care B.imagine C.know D.understand 16A.challenges B.inspires C.improves D.matters 17A.always B.seldom C.still D.once 18A.bravely B.firmly C.excellently D.hurriedly 19A.courage B.kindness C.trouble D.wisdom 20A.examples B.blames C.words D.ideas
下列四个图象能正确反映其对应实验操作的是
同学取某地石灰石样品12g进行测定实验现将100g稀盐酸分五次加入石灰石样品中杂质不溶于水也不参与反应充分反应后测得生成气体的总质量如表所示 试求 1m的值为g 212g石灰石样品中碳酸钙的质量分数是多少写出计算过程计算结果精确至0.1% 3是计算生成氯化钙的质量是g．
下列物质属于盐的是
空气中含量较多且性质不活泼的气体是
钛合金是重要金属材料．钛元素的信息如图所示下列说法不正确的是
将少量下列物质与水混合能形成溶液的是
金属和金属材料在生活中有广泛用途． 1高铁列车电路中的导线大多是用铜制的这是利用了铜的延展性和性． 2用一氧化碳和赤铁矿炼铁的化学方程式为． 3车体表面除美观外主要是为了防止外壳生锈其防锈原理是．用稀盐酸除铁锈的化学方程式是．
将3.2g某红棕色粉末与足量的碳充分反应将产生的二氧化碳气体全部通入足量的澄清石灰水中得到3g白色沉淀．计算 1生成二氧化碳的质量 2红棕色粉末中氧元素的质量分数．
用化学用语表示 1空气中含量最多的物质 23个铵根离子 3澄清石灰水中的溶质 42个亚铁离子 5金属铝表面形成的保护膜 6石灰石的主要成分 7+4价硫元素的氧化物的化学式．
氢氧化钙俗称熟石灰在生产和生活中有广泛的用途． 1熟石灰可由生石灰溶于水制得反应的化学方程式是． 2用石灰水检验二氧化碳反应的化学方程式是． 3用熟石灰来改良酸性土壤反应的化学方程式是以土壤中含有硫酸为例． 4用熟石灰粉与草木灰主要成分是K2CO3按一定比例混合可制得高效环保农药“黑白粉”．使用时选择在有露水的早晨把“黑白粉”撒在植物茎叶上可消除忌碱虫体． “黑白粉”可提供植物必需的营养元素是填元素符号．
化学小组同学在某工厂废水处理池中提取一瓶含有AgNO3CuNO32和AlNO33的工业废水样品带回实验室．静置取上层清液加入锌粉充分反应后过滤得到滤液甲和滤渣乙．请完成以下探究不考虑杂质干扰． 【提出问题】滤渣乙是什么 【做出猜想】小明认为滤渣乙是银小东认为滤渣乙是银和铜小华认为滤渣乙是银铜和铝你认为滤渣乙还可能是． 【交流讨论】大家经过讨论后认为小华的猜想错误理由是． 【实验探究】设计实验探究滤渣乙的成分请填写下列空白 【反思交流】通过交流大家认为此时滤液甲中含有的溶质是．
Iafornotbeingabletojoinyoufordinner.
Mostpeoplesayyesmuchmorereadilythanno. Afriendismovinghousethisweekendandwouldlikesomehelpandyouagree.Butwhatyoureallywantisacoupleofquietdaysrelaxingathome.Oraroommatespendstheentireweekendsplayingvideogamesandwantstoborrowyourhomeworkforreference.Butyou'vejustfinisheditaftertakingawholedaytoworkhard. Manypeoplesayyestothesekindsofrequests.Theytendnottoconsidertheirowninterestsandfeelingsandareoftenangrywiththemselvesafterwards. Sayingnorequirescourageandconsiderablepracticeinfactaccordingtopsychologists. EveryonewantstobelikedsaysGabrieleSteinkiaGermanpsychologist.Saying‘no'riskslosingtheaffectionofthepersonaskingthefavororevenajob. Theresultisthatmanypeoplesayyesjustforkeepingthepeace.Butexpertssaythisisregrettable.Anyoneshouldhavetherighttosayno. Infactrejectingarequestcanevenhelptostrengthenarelationshipbecauseitexpressesatruefeeling. Butforpeoplewhoareusedtoagreeingtoeveryrequestchangingcanbealonganduncomfortablelearningprocess. MostpeoplebelievethatIfIsay‘no'I'lllosetheaffectionoftheperson.Buttheaffectionisimportanttome.Thiswayofthinkingcanbereplacedbythis:IfheonlylikesmebecauseIalwaysdowhatsuitshimthenthepriceofhisaffectionistoohighinthelongterm. Steinkisaysthekeyistalkingtotheotherpersontofindamutual相互的solution.Oneneedstopresentthesituationfromone'sownpointofviewandtosuggesthowthesituationcanbedealtwithtotheadvantageofbothparties.Theotherpersonmusthavethefeelingthathisinterestsarebeingconsidered. WhentherefusalisnotacceptedSteinkiadvisesgivingthereasonscalmlyagainuntilthepersongetsthemessage. 1Mostpeoplesayyesmuchmorereadilythannobecause. A.theydon'tcareabouttheirowninterestsandfeelings B.theydon'tknowtheywillregretafterwards C.theyhavealreadybeenusedtosayingyes D.theycaremoreaboutothers'affection 2Intheopinionofpsychologists. A.peopleneedalotofpracticetosayno B.peopleshouldsayyestokeepthepeace C.sayingnomeanslosingajob D.peoplehavetherighttobeliked 3AccordingtoSteinkiwhatshouldyoudoifyouwanttorefusetheotherperson'srequest? A.Justsayyoucan'thelphim. B.Saysorrytohim. C.Refusehimclearly. D.Talktotheotherpersontofindamutualway.
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