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如图是去除粗盐中难溶性杂质的实验，请回答： （1）图中正确的操作顺序为 （填字母序号）； （2）操作B中，玻璃棒的作用是 ； （3）过滤操作中，实验后发现出现滤液仍然很浑浊，可能的两点...
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右图是中的一些重要实验请回答1A.是氢气或甲烷的燃烧实验点燃前必须2B.是除去粗盐中难溶性杂质实验中
学习化学离不开实验.1稀释浓硫酸时应在烧杯中先加入填浓硫酸或水•2在粗盐中难溶性杂质的去除的实验中四
某化学兴趣小组的同学按下图操作完成粗盐含有难溶性杂质提纯的实验下列说法中正确的是
各项实验操作完全正确
正确的操作顺序为①⑤②③⑥④
去除杂质的关键步骤是④
操作③④中玻璃棒的作用是相同的
某同学按照课本做粗盐中难溶性杂质的去除实验并用所得的精盐配制200g质量分数为20%的氯化钠溶液.实
如图K11－3是去除粗盐中难溶性杂质的实验请回答图K11－31图中正确的操作顺序为________2
下面是去除粗盐中难溶性杂质的实验请回答1图中正确的操作顺序为填字母序号2操作填字母序号中玻璃棒的作用
去除粗盐中难溶性杂质的实验操作如下图所示AB.C.1此实验的正确操作顺序是______填字母2经操作
在粗盐中难溶性杂质的去除实验中玻璃棒的用途不正确的是
称取粗盐后，把粗盐研磨细
溶解时搅拌，加速粗盐溶解
称量精盐前，把精盐固体转移到纸上
蒸发时搅拌，防止因局部温度过高，造成液滴飞溅
如图用下列实验操作可完成两个实验甲实验为粗盐中难溶性杂质的去除乙实验为配制溶质的质量分数为10%的氯
甲实验的步骤是①④⑤，其中去除杂质的关键步骤是蒸发
甲实验各步操作中，玻璃棒的作用都是相同的
乙实验若按照②③①的步骤进行操作，砝码为5 g(游码读数0)，则配制的溶液浓度偏大(ρ
水
＝1 g/cm
3
)
乙实验中，若①所用的烧杯内壁沾有水，对配制的溶液浓度无影响
下面是去除粗盐中难溶性杂质的实验请回答1右图中正确的操作顺序为填字母序号2操作填字母序号中玻璃棒的作
某同学按照课本做粗盐中难溶性杂质的去除实验并用所得的精盐配制200g质量分数为20%的氯化钠溶液.实
以下是氯化钠溶液的配制和粗盐中难溶性杂质的去除需要计算粗盐的产率实验活动中的部分操作1仪器a的名称是
去除粗盐中难溶性杂质并计算产率的实验操作如图所示1正确的操作顺序是称量粗盐质量填序号称量精盐质量计算
如图所示为进行粗盐中难溶性杂质去除的实验正确的操作顺序是
①②③④
①②④③
①③②④
①④③②
除去粗盐中的难溶性杂质并用制得的精盐配制溶液回答有关问题粗盐中含有的难溶性杂质在实验室里可以通过溶解
学习化学离不开实验.1稀释浓硫酸时应在烧杯中先加入填浓硫酸或水2在粗盐中难溶性杂质的去除的实验中四个
在粗盐中难溶性杂质的去除实验中操作步骤为溶解过滤蒸发计算产率.这这四步操作中均要用到的一种仪器是
烧杯
漏斗
玻璃棒
酒精灯
用海水制得的粗盐中含有多种可溶性杂质氯化镁氯化钙等和不溶性杂质泥沙等请回答下列问题1实验室去除粗盐中
根据实验活动粗盐中难溶性杂质的去除填写相关实验内容1实验目的学生可以初步学习除去粗盐中难溶性杂质的实
在粗盐中难溶性杂质的去除实验中玻璃棒的用途不正确的是
称取粗盐后，把粗盐研磨细
溶解时搅拌，加速粗盐溶解
称量精盐前，把精盐固体转移到纸上
蒸发时搅拌，防止凶局部温度过高，造成液滴飞溅
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如图正方形ABCD的边长为1PQ分别为边ABAD上的点．若则△APQ的周长是
SanFranciscoisquicklybecomingoneofthemostvisitedcitiesintheU.S.TheCitybytheBaypacksalotofmust﹣seespotsinjusta7mile﹣by﹣7milearea. BatheinthesunatDoloresPark SanFranciscoisknownforitsfogbutcertainareasofthecityreceiveasurprisingamountofsunshineespeciallyinfall.IfyoucatchthecityonasunnydayheadtoDoloresParkintheMission.ItcangetabitcrowdedontheweekendsbutifyoucanpushinonapieceofgrassbuyacupoficecreamfromnearbyBi﹣RiteCreameryandenjoyyourself. SeetheMissionMurals壁画 AlthoughSanFranciscohasplentyofmuseumsyoudon'tneedtopayentrytoenjoysomeart.TheMissionneighborhoodhasplentyofstreetartandmuralsthatreflectthecultureandhistoryofthecommunity.MypersonalfavoriteisthemuralontheWomen'sBuilding.Don'tmissit! VisitHaightAshbury AnotherimportantpartofSanFrancisco'sidentityisitshippie嬉皮culture.Duringthe‘60sand‘70sHaightAshburywashometofamoussingerslikeJanisJoplinandtheGratefulDead.Nowtheneighborhoodisfullofhippiememoriesandstreetarthonoringtheanniversaryof1967'sSummerofLove. EatItalianatNorthBeach TraditionalItalianfoodmaynotbethefirstcuisine佳肴thatcomestomindwhenthinkingofSanFranciscobutyoumayleavethecitydaydreamingaboutit.NorthBeachistheItalianneighborhoodandyou'llfindplentyofdeliciousfreshItalianfoodtofillyourstomach. 1WhenisSanFranciscomostsunny? A.Inspring. B.Insummer. C.Inautumn. D.Inwinter. 2WhatcanweknowabouttheMissionMurals? A.Therearemanymuralsonthestreets. B.Therearefewmuralsinthemuseums. C.Theyareaboutthefuturelife. D.Theyarethebestmuralsintheworld. 3Wheremaymusic﹣loverschoosetogo? A.NorthBeach. B.HaightAshbury. C.DoloresPark. D.Missionneighborhood.
甲苯是有机合成的重要原料既可用来合成抗流感病毒活性药物的中间体E也可用来合成γ﹣分泌调节剂的药物中间体K合成路线如图 已知i．R1NH2+Br﹣R2R1﹣NH﹣R2+HBr ii． 1A的结构简式为． 2C中含氧官能团名称为． 3C→D的化学方程式为． 4F→G的反应条件为． 5H→I的化学方程式为． 6J的结构简式为． 7利用题目所给信息以和为原料合成化合物L的流程如下写出中间产物1和中间产物2的结构简式 ① ②合成L的过程中还可能得到一种高分子化合物其结构简式为．
5ProfessionalResume简历WritingTips Whetheryouaresearchingforajoboryousimplywanttochangecareersitisimportanttohavearesumethatsellsyoutopotentialemployers. Competitionforjobsisfierce.1.Thismeanstheyarelikelytospendonlyafewsecondslookingatyourapplication.Listthemostimportantinformationatthetopoftheresume.Eveniftheyonlyreadhalfwaythroughtheywillknoweverythingtheyneedtomakeadecision. 2.Makesureyoudesignjobtitlesthatindicatewhatyourjobexperienceis.InsteadofsimplylistingKitchenhelpuseFrycookandpart﹣timebaker.Themanagerwillbeabletotellataglanceifyouhavetheexperiencetheyneedfortheiropenposition. Animportantaspectofresumewritingistheabilitytosellyourselftothehiringmanager.Becausetheywanttoknowifyouwillbefitforthecompanysowhilewritingyourresumetrytoconnectyourskillstopracticality.Tellpotentialemployersthatyouincreasedrevenue税foryourpreviousemployerby30%.3. Manyemployersaresearchingonlineforjobcandidates.Tomaximizethechancesofhavingyourresumeseentrytoaddkeywordstothetextbeforeyouuploadittoaresumehostingsite.Youshoulddosomeresearchonthetypesofkeywordsemployersareusingtofindcandidates候选人.4. Yourresumewritingneedstobeperfect.5.Itisagoodideatosettheresumeasideforafewdaysandreaditagainwithfresheyes.Ifyouneedtogetitoutquicklyyoucanhavesomeonethatyoutrustreviewitbeforeyousubmitittoapotentialemployer. A.Youhadbetterusedescriptivejobtitles. B.Manyemployersaretiedupwithapplicationsandresumes. C.Thatismuchmoreimpressivethanthatyousimplysolditems. D.Youaresupposedtosendyourresumerepeatedlyandcarefully. E.Thereforerereadyourresumeseveraltimestocatchanyerrors. F.Becausethehiringmanagerwillspendalittletimelookingatyourresume. G.Oneideaistolookatthejobannouncementandusesomeofthekeywordsfoundthere.
下列解释工业生产或应用的化学用语中不正确的是
若sin﹣α＝则cos+α＝．
It'snoteasyfeelinglikeyou'realwaysunderthespotlightbeingjudgedforeachlittlemistakeyoumake.Yourmindisinanendlesscircleplayingwhatyousaidanddidoverandoveragain.Youwishyouhadatimecapsuletogobackandmakethingsfightifyoufindmistakes.Youfearwhatotherswillthinkaboutyouandthattheywillrejectanddislikeyou.Youseektobesociallyperfect. Academicallyyouworklongendlesshoursjusttomakethoseexcellentmarks.Althoughmostwouldsayit'sgoodtohavehighstandardstheyhavenoideaabouttheinternalhellyouputyourselfthroughtoachieveperfection.Ifyoucomeuplessthanyourdesiredgoalyoufeelasthoughyouhavefailedbutyou'refarfromfailingyoujustdon'tseeitthatway.Soinsteadyouaretellingyourselfthatyou'restupidandnotsmart.Thepressureyouplaceonyourselfweighsyoudownandyouwearthenotgoodenoughlabeleachandeveryday. Younotonlyhavehighstandardsforyourselfbutyoualsohavethemforothers.Ifpeopledon'tperformuptoyourexpectationsthenyouthinkthemincompetent.Thiscausesalotoffrustrationbecauseyoucan'ttrustanyonetogetthingsright.Soinsteadofbeingateamplayeryouflysolo单飞andtrytodotwoorthreejobsatonce.Yourunrealisticexpectationscauseyoutocriticizeandjudgeothersandthatleadstoproblemsinotherareasofyourlife. Theattempttobeperfectiscalledperfectionismandit'stheunachievableAmericandreamthat'sdamagingouremotionalandmentalhealth.Westriveforperfectionwithourbodyinourperformanceandinourrelationships.Inasocietythatoverstatesmistakesisitanywonderthatsomanyyoungpeopleattempttheimpossibletaskofbeingperfect? Weallhaveflawsfearsandmakemistakesandthat'sperfectlyOK.It'sourimperfectionsthatmakelifeinterestingandtheyhelpusgrowintoastrongermoreadaptableperson.Wedon'thavetostrivetoachievetheimpossible.Wearedesignedtobeperfectlyimperfect. 1Whereisthistextmostlikelyfrom? A.Adiary. B.Amagazine. C.Anovel. D.Aguidebook. 2Whichofthefollowingisaperfectionistmostlikelytoagree? A.Begenerouswithpraise. B.Nobodyisperfect. C.Thereisnobestonlybetter. D.Acontentedmindisaneverlastingfeast. 3Whatcanweinferfromparagraph4? A.Thesocietyispartlytoblameforperfectionism. B.Moreandmorepeoplearetoleratingmistakes. C.Manyyoungpeoplefinditimpossibletobeperfect. D.It'sunusualforasocietytoseekperfectionismnowadays. 4Whatdoestheauthorthinkofimperfection? A.It'sunbearable. B.It'spartofourlife. C.Itdeservestobeovercome. D.Itdoesharmtoourmentalhealth.
某柔性屏手机的柔性电池以碳纳米管做电极材料以吸收ZnSO4溶液的有机高聚物做固态电解质其电池总反应为MnO2+Zn+1+H2O+ZnSO4MnOOH+ZnSO4[ZnOH2]3•xH2O 其电池结构如图1所示图2是有机高聚物的结构片段．下列说法中不正确的是
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WhatiseBay?Thesimpleansweristhatitisaglobaltradingplatform贸易平台wherenearlyanyonecantradepracticallyanything.PeoplecansellandbuyallkindsofproductsandgoodsincludingcarsmoviesandDVDssportinggoodstravelticketsmusicalinstrumentsclothesandshoes﹣thelistgoesonandon. TheideacamefromPeterOmidyarwhowasborninParisandmovedtoWashingtonwhenhewasstillachild.AthighschoolhebecameveryinterestedincomputerprogrammingandaftergraduatingfromTuftsUniversityin1988heworkedforthenextfewyearsasacomputerengineer.InhisfreetimehestartedeBayasakindofhobbyatfirstofferingtheservicefreebywordofmouth.By1996therewassomuchtrafficonthewebsitethathehadtoupgrade升级andhebeganchargingafeetomembers.JoinedbyafriendPeterSkillandin1998byhiscapableCEOMegWhitmanhehasneverlookedback.EBayhasgonefromstrengthtostrength.ItisnowoneofthetenmostvisitedonlineshoppingwebsitesontheInternet. eBaysellsconnectionsnotgoodsputtingbuyerandsellerintocontactwitheachother.Allyouhavetodoismakeane﹣photowriteadescriptionfilloutasalesformandyouareinbusinesstheworldisyourmarketplace.OfcourseforeachitemsoldeBaygetsapercentageandthatisgreatdealofmoney.EverydaytherearemorethansixteenmillionitemslistedoneBayandeightypercentoftheitemsaresold. 1WelearnfromthetextthateBayprovidespeoplewith. A.aplacetoexhibittheirownphotos B.awebsiteforthemtoupgrade C.awayofbuyingandsellinggoods D.achancetobuythingsatlowprices 2WhydidPetercreateeBayaftergraduatingfromuniversity? A.Tomakemoney. B.Forfun. C.Forgatheringtheengineers. D.Tofinishataskofhiscompany. 3FromhehasneverlookedbackinParagraph2welearnthatPeter. A.didnotfeellonely B.wasalwayshopeful C.becamemoreandmoresuccessful D.didnotthinkaboutthepast 4HowdoeseBaymakemoneyfromitswebsite? A.Bybringingcallerstogether. B.Bymakinge﹣photos. C.Bylistingitemsonline D.Bychargingforeachsale
假定你是李华你的英国笔友Peter对中国日报举办的中国文化符号表情包设计大赛非常感兴趣特发邮件向你询问相关情况.请你回封邮件内容包括 1.参赛作品要求和对象 2.投稿方式及截止日期 3.建议他参加比赛. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯 3.开头和结尾已为你写好不计入总词数 4.参考词汇中国文化符号表情包设计大赛EmojiDesignContestofChineseCulturalSymbols DearPeter Yours LiHua
下列实验操作现象和结论均正确的是
YesterdayIwenttothenursinghometovisitmygrandma.Shejustgotoutofthehospitalrecentlywhereshehadsomeseriousoperations.IwantedtosurpriseherafterworksoIstoppedbyforaquickvisit. WhenIgotthereshewashappytoseeme.Wehuggedkissedandexchangedgreetings.ThenIheardawomancrying.Itwasmygrandma'sroommate.ThecurtainwasdrawnsoIcouldnotseeher.Shestartedcallingoutanamethatwasn'tminebutshewascertainlytalkingtomebeggingmetogotohersideoftheroom. Iignoredheratfirstandcontinuedvisitingwithmygrandma.ThenshestartedbeggingandsayingPleasecometoseeme！SoIwenttoseeher. WhenIdrewthecurtainbackshelookedsooldbutflashedmethebiggestsmile!SheopenedherarmswideformetohughersoIbentlowandgaveherahug.Isatonherbedandtalkedwithherforafewminutes.ShekeptcallingmebytheothernamebutIdidnotcorrecther.ShetoldmestoriesasifIhadbeentherewhentheyhappened. FinallyIwentbacktotalkwithmygrandma.ThentheotherwomanstartedcryingagainsayingPleasecomeback.Shefinallyslept. Istoppedbythenurse'sstationandthenursetoldmethattheladysuffersfromAlzheimer's.Imentionedthenameshehadcalledme.Thenursetoldmeitwasthelady'sdaughter'sname.ThenIunderstoodwhyshewantedmetogototalkwithher. Wewillallgetoldsomeday.Someofuswillhavebrokenmindslikemygrandma'sroommateandsomeofuswillhavebrokenbodieslikemygrandma.AsIwasleavingIpromisedIwouldgobackandvisittheladyevenaftermygrandmamovedbacktoherhome. 1Whydidtheauthor'sgrandmaliveinanursinghome? A.Becausesheneededanotheroperation. B.Becauseshehadbeenlivingthere. C.Becauseshehadtorecoverthere. D.Becauseshewaitedforthewritertocome. 2Accordingtothetextthewomancriedbecause. A.shemissedherdaughterverymuch B.sheexpectedtotellstoriestothewriter C.shewastroubledbythewriter'stalking D.shefearedthecurtainbeingdrawn 3Whatlessondidtheauthorlearnfromherexperience? A.Theoldneedcarefromothers. B.Theoldwillbecomeforgetful. C.Everyonewillgetoldsomeday. D.Weshouldn'tleavetheoldinthenursinghome. 4Whichofthefollowingisrightaccordingtothepassage? A.Theauthor'sgrandmahadsomeseriousillness. B.Theauthorwouldgobackandvisittheoldlady. C.Theauthor'sgrandma'sroommatecameouttoseeme. D.Theauthor'sgrandma'sroommate'sdaughteralwaysvisitedhermother.
ThereisatraditioninmyschoolthatwhentheCollegeEntranceExaminationislessthanamonthawaystudentsinthe1lowgradesfromSenior1toSenior2allgathertogetheronthegroundinfrontoftheteachingbuildingandcheerontheSenior3studentswhoarestandingupstairs.Itwasn'tuntilI2persontookpartintheactivitythatIunderstoodthereal3meanofit. IwasinSenior2atthetime.4thatspecialnightalltheSenior3studentsstoodinthecorridors走廊andlookeddownattheyoungerstudentsbelow.5varycheersstartedtoresoundthroughouttheschoolwaveafterwave.Believeinyourself!Youdeservetowin！ 6seeeveryone'ssmilingfacesaroundmeIthoughtof7famousquotefromtheAmericanphilosopherHenryDavidThoreauWhatyougetbyachievingyourgoalsisnotasimportantaswhatyoubecomebyachievingyourgoals. Soonitwillbemyturnto8blessinthisway9alsomeansIwillhavetosaygoodbyetomyschool.Sadasitwillbebeingcheeredonbysomanystudentswillstillbeoneofthebrightest10timeofmylife.
IcanproudlysaythatlastyearIbroketherecordfortheoldestpersonintheworldtoridearoller﹣coaster.I'm105butIfeelyounger.EventhedoctoragreesI'mingoodcondition.I'mabitdeafandmylegsfeelweakbuttheyaretheonlyissue. IrodetheTwistosaurusatFlamingoLandwhichspinsyouroundquitefast.Ididn'tchoosetogoonthat.I'dhavepreferredareallyfastonethatwentupsidedown.ButIwastoldIcouldn'tridesomethinglikethatbecausemybloodpressurecoulddropandImighthavesomedanger. Iwasn'tnervous﹣Idon'tgetfrightenedofanyting.IwassecurelyfastenedsoIknewIwouldn'tfallout.Theroller﹣coasterridewentonforthreeorfourminutesanditcouldn'tbeabetterexperience.AndIraisedalotofmoneyfortheDerbyshireLeicestershire&RutlandAirAmbulancefundwhichwasfantastic. PeopleweresayingI'dgotaplaceintheGuinnessWorldRecords.Latersomeonecametopresentmewiththecertificate.Ihaditonthewallinmylivingroomwithanotheronethatgotayearearlier. Myrecord﹣breakingwaysreallybeganacoupleofyearsagowiththeice﹣bucketchallenge.ItturnedoutthatIwasprobablytheoldestpersonintheworldtodoitandthevideowasverypopular.AfterthatIstaredtothinkaboutwhatelseIcoulddotoraisemoneyfordifferentcharities. I'mnotsureifanyoneadmiresallthefunI'mhaving.TheyjustsayI'mdaftandthat'saboutit.ButI'vehadmanygooddaysandmanyexcitingtimes.I'vehadareallygoodlife.Idon'tthinkI'vewastedanyofit. 1Whydidn'ttheauthorchoosetogoonridingtheTwistosaurus? A.Becausehewastoldnottodoso. B.Becauseheconsideredittoogentle. C.Becausehethoughtitspuntoofast. D.Becausehewasinabadphysicalcondition. 2Howdidtheauthormostprobablyreactwhileridingtheroller﹣coaster? A.Hereallyenjoyedhimself. B.Hewasveryworriedatfirst. C.Hecouldn'tthinkmuchaboutit. D.Hegotfrightenedasitstartedmoving. 3WhatdoyouknowabouttheauthorfromParagraph4? A.Hewaseagertogetcertificates. B.Hedislikedshowingoffhissuccess. C.Hewastheoldestpersonintheworld. D.Hesetarecordtheyearbeforelastyear. 4Whichwordcanbestdescribetheauthor? A.Cooperative. B.Optimistic. C.Generous. D.Intelligent.
在平行四边形ABCD中AB＝3AD＝1.•＝﹣＝2则•＝．
SUPPORTWORKER Doyouhavetheabilitytocareforothers?Canyouunderstandhowolderpeoplefeel?Areyouagoodcommunicator?Doyouhavegoodlisteningskills?Canyouworkweekends? IfyouhaveansweredYEStotheabovewewouldliketohearfromyou ☆Startingrateof￡8.56perhour ☆Freeuniform ☆Excellenttraining careers@golden﹣care.com WOWEEMAGAZINE WritersWanted WoweeMagazineislookingforwritersforitswebsite.Payisbasedonthenumberofpeoplewhoreadyourarticles.Youmayalsoreceivefreeticketstoeventsandfreeproductstotest.Thisisagreatopportunitytogetvaluableworkexperience. Wewantpeoplewhoarechattyinterestingpassionateskilled Contactusatinfo@wowee.com. CALLINGALLMODELS Thinkyoucouldbeamodel?Ifsowe'dliketomeetyou! Workingasasuccessfulfashionmodelisn'teasybutitisveryexcitingandcouldbeagreatopportunity. Girlsshouldbeover16withaminimumheightof172cmandboysshouldhaveaminimumheightof182cm.Ifyouareunder16anddonotyethavetherequiredheightwewouldstillbeinterestedinmeetingyoubutyoumustbringaparent. info@top﹣model﹣agency.uk WORKFORCOFFEEBEANS JoinBritain'snumberonecafeatCoffeeBeanswhereeverycafehasthesameaimstocreatefamily﹣liketeamsandtogiveexcellentcustomerservice. ManydifferentkindsofpeoplecomeandworkwithussostartyourcareeratCoffeeBeanstoday ☆Choosethehoursyouwork ☆Getmanagementexperience ☆Shareyourloveofcoffee JoinusasaTeamMemberAssistantManagerofCafeManagerdependingonyourskillsandexperience. Emailusatjobs@coffeebeans.co.uk. 1Whichaddressshouldyouemailatifyouwanttobeasupportworker? A.info@wowee.com B.jobs@coffeebeans.co.uk C.careers@golden﹣care.com D.info@top﹣model﹣agency.uk 2AwriterworkingforWoweeMagazinecan. A.getafreeuniform B.receivefreeticketstoevents C.bringaparent D.chooseworkinghours 3Whatcanwelearnaboutthejobsfromthejobpostings? A.Themodelopportunityisonlymeantforadults. B.Thereisnoneedtobetrainedasasupportworker. C.EmployeesatCoffeeBeanshavefewmanagementopportunities. D.ApplicantstoWoweeMagazineareexpectedtobesociableandenthusiastic.
Ifyoudesiretomeetnewfriendshavefunandgetintoshapebasketballisthebestsportforyouregardlessofwhetheryouareaprofessionaloranamateur.1. Herearesomeofthebenefitsyoucanacquirefromplayingbasketball. •Improveyourfitnesslevels. Playingbasketballwilldefinitelyimproveyourfitnesslevels.Basketballisanamazingcardiovascular心血管的exercisewhichisbeneficialtopeoplewithheartproblems.2 •Encourageteamwork. Basketballrequiresteamworktoachieveacommonobjective.3thissportisgreatforkidsasitshowsthemhowtoworktogetherinharmonytoreachthegoal.Learninghowtorelatewithotherswillimproveyourchild'sconfidenceaswellasself﹣esteem.自尊 •4 Makingashotorwinningcanreallyimproveyourchild'sself﹣esteemwhichisavitalaspectduringchildhood.Childrenwithconfidenceareabletoovercomechallengesbetteraccordingtorecentstudies. •Developsocialskills. Itbringsindividualstogetherandhelpscreatefriendshipandbonds.Thisprovidesagreatopportunityforchildrenwhoareshyasithelpstheminteractwithnewfriends.5 Althoughtherearenodrawbacksassociatedtoplayingbasketballitisnecessarythatyouperformotherexercisestoimproveyourspeedandpower. A.Buildupyourmuscles. B.Improveconfidenceandself﹣esteem. C.Theplayershavetoworkasateamtoguaranteeawin. D.Socialskillswillhelpyourchildfunctionbetterinlife. E.Basketballispopularworldwideduetoavarietyofreasons. F.Generallyspeakingbasketballisoneofthesafestsportsintheworld. G.Moreoveritaidsinoxygencirculationandblooddistributionthroughoutthebody.
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. DearTom I'mgladtohearthatyouareconsideringmakeupwithPeter.IfIwereyouIwouldconsiderabikeforabirthdaypresent. AsfarasIknowPeterisalwaysinpoorhealthsoheshouldtakemoreexercisesbyridingabiketohavehisbodybuildup.Meanwhileyoucanoftengooutbybiketogetherwhichwashelpfulinrebuildingyourfriendship.Besidestakingabikeisenvironmentallyfriendlymeansoftransport.Itisconvenienttogetaroundaswell.Apartfromgivinghimagiftandyoucanalsoadoptothermeanssuchastravelingseeingamoviehavingdinnerandgoingshopping.Nomatterhowyoudobeingsincereisthemostimportant.Don'thesitateandtryingtotakeaction.Ireallyhopethatwecanmakeupandbegoodfriendsforever. Bestwishes! LiHua
我国在物质制备领域成绩斐然下列物质属于有机物的是
用纳米Fe/Ni复合材料能去除污染水体的NO3﹣Ni不参与反应．离子在材料表面的活性位点吸附后发生反应活性位点被其他附着物占据会导致速率减慢NH4+无法占据活性位点．反应过程如图所示 1酸性环境中纳米Fe/Ni去除NO3﹣分两步将步骤ii补充完整 Ⅰ．NO3﹣+Fe+2H+═NO2﹣+Fe2++H2O Ⅱ．++H+＝Fe2+++ 2初始pH＝2.0的废液反应15min后出现大量白色絮状物过滤后很快变成红褐色结合化学用语解释整个变化过程的原因． 3水体初始pH会影响反应速率不同pH的硝酸盐溶液与纳米Fe/Ni反应时溶液中随时间的变化如图1所示．注c0NO3﹣为初始时NO3﹣的浓度． ①为达到最高去除率应调水体的初始pH＝． ②t＜15minpH＝2.0的溶液反应速率最快t＞15min其反应速率迅速降低原因分别是． 4总氮量指溶液中自由移动的所有含氮微粒浓度之和纳米Fe/Ni处理某浓度硝酸盐溶液时随时间的变化如图2所示．40min时总氮量较初始时下降可能的原因是． 5利用电解无害化处理水体中的NO3﹣最终生成N2逸出．其装置及转化图如图所示 ①阴极的电极反应式为． ②生成N2的离子方程式为．
It'shardwhenabestfriendisn'taround﹣maybebecauseheorshemovedtoadifferentschooloradifferentclass.1Youwanttohavenewfriendsbuthowdoyoumake?Maybeitseemsthateverybodyelsealreadyhashisorherfriends.2Startbylookingaroundyourclassroom﹣thinkaboutwhichkidsyou'dliketoplaywithatbreak.Lookforchancestosayhitothemsmileandbefriendly.3InvitesomeonetoplaywithyouorsayDoyouwanttosithere?inthelunchroom.Whenyou'reatbreakwalkovertokidsyouwanttoplaywithactfriendlyandsayHicanIplaytoo?orjustjoinin. Ifyouhavetroubledoingthisorifyou'refeelingshyaskyourteachertohelpyoumakenewfriends.Teachersareusuallyprettygoodatmatchingupfriends.4Bekindbefriendlysharesaynicethingsoffertohelp﹣andprettysoonyou'llhaveoneortwoorevenmorenewfriends. 5Butwhenyouseeeachotheryoucansharesomethingyoudidn'thavebeforeheorsheleftYoucanintroducehimorhertoyournewfriends! A.What'srightforme? B.Butrememberthere'salwaysroomformorefriends. C.Youmayfeellonelyatbreakorlunchtime. D.Thebestwaytomakefriendsistobeafriend. E.Offertosharesomethingoroffergreetings. F.Makeachoiceinyourlife. G.Youmightstillmissthatspecialbestfriends.
GreenbergwasaluckyguytoenterColumbiaUniversityonfullscholarship.ButjustbeforejunioryearGreenberg's1changed.Onedayhisvision2upandlaterhewasdiagnosed诊断withglaucoma青光眼.ThendoctorsoperatedonGreenberg'seyes.3thesurgerydidn'twork.Greenbergwasgoingblind.Hewasso4thatherefusedtoseeanyone. AsGreenberg'sbestfriendArthurpersuadedGreenbergtogobacktoColumbiaand5tobehisreader.Arthurread6tohimeverydaytakingtimeoutfromhisownstudyandGreenberg7scoringstraightA's.Stillhewas8aboutgettingaroundaloneandreliedonhisfriend. ThenoneafternoonGreenbergandArthurwenttoMidtownManhattan.WhenitwastimetogobacktocampusArthursaidhecouldn't9himbecauseofanappointment.Greenberg10TheyarguedandArthurwalkedoff11GreenbergaloneinGrandCentralTerminal. Greenbergwhowascompletely12stumbled蹒珊throughtherush﹣hourcrowd.HetookashuttletrainwesttoTimesSquareandthentransferredtoanuptowntrain.Fourmileslaterhe13attheColumbiaUniversitystop. Attheuniversity'sgatessomeone14him.Oopsexcusemesir.Greenberg15thevoice.ItwasArthur's.Greenberg'sfirstreactionwas16butinthenextsecondherealizedwhathehadjust17﹣andrealizedtoowhohadmadeitpossible.18Arthurhadbeenwithhimthewholewayusingoneofthemost19strategies. Blindnessdoesn'tmakeGreenbergfailtoappreciatethe20oflife.Healwayssaysheistheluckiestmanintheworld. 1A.faith B.attitude C.fortune D.reputation 2A.lit B.steamed C.cleared D.cheered 3A.Otherwise B.Moreover C.Therefore D.However 4A.shy B.desperate C.selfish D.nervous 5A.offered B.pretended C.happened D.learned 6A.letters B.newspapers C.textbooks D.magazines 7A.endedup B.carriedon C.imagined D.considered 8A.curious B.confident C.excited D.tentative 9A.abandon B.rescue C.comfort D.accompany 10A.compromised B.panicked C.explained D.apologized 11A.leaving B.finding C.consulting D.serving 12A.tired B.amused C.confused D.satisfied 13A.gotoff B.pulledover C.lookedaround D.ranaway 14A.turnedto B.shoutedat C.knockedinto D.quarreledwith 15A.raised B.lost C.controlled D.recognized 16A.anger B.pleasure C.relief D.sorrow 17A.missed B.questioned C.ignored D.achieved 18A.Gradually B.Finally C.Obviously D.Strangely 19A.brilliant B.familiar C.defensive D.complex 20A.magic B.beauty C.wisdom D.truth
Dolphinsaremuchmoreintelligentthanhumanspreviouslythought.Scientistshaverecentlydiscoveredthatbottle﹣noseddolphinscanrecognisethemselvesinthemirror﹣muchlikeyouandIcan! Whenyouseeazit青春痘onyourfacewhatdoyoudo?Gotothemirrortimeandagainandwonderwhatitisstilldoingthere.Wellthisisexactlywhattwomalebottle﹣noseddolphinsPresleyandTabdoaswell.Sotheselovableanimalsarenotjustsailors'friendsbuttheyarealsoawareoftheirbodies﹣almostlikehumans! PresleyandTabstayinapoolwithreflectiveglasswallsintheNewYorkAquarium.ResearchersnoticedthatwhenPresleyandTabsawtheirownreflectionsunlikemostotheranimalstheydidnotseemtothinkthattheywerelookingatanotherdolphin.Dolphinsareverysocialcreaturesandarefriendlywithhumansaswellastheirownkind.Thisgottheresearchersthinking.Perhapsthedolphinsrecognisedtheirownimages?Sotheydecidedtofinditout. Usingspecialinktheymademarksondifferentpartsofthedolphins'bodieschangingtheplaceeveryweek.Everytimetheirbodiesweremarkedthedolphinsmademoretripstothemirrorthanusual.Iftheinkmarkwasontheirbelly腹部theywouldexposetheirbellytothemirrorandlookatitforalongtime.Imaginethedolphinswondering﹣Nowwheredidthatmarkcomefrom?Isitdangerous?Iwonderhowlongit'sgoingtostay. Tillnowonlythegreatapeshavedisplayedthisqualityofrecognisingtheirimagesinthemirror.Allotheranimalshavefailedthistest.Theresearchersfeelthatthesefindingsmayincreasehumansensitivitytowardsdolphinswhicharebeinghuntedandkilledingreatnumbers.Dolphinfins鳍areconsideredasdeliciousnessinseveralSouth﹣EastAsiancountries. 1Whatisthescientists'recentfindingaboutdolphins? A.Dolphinsaresocialcreaturesfriendlywithhumans. B.Dolphinsarenotsointelligentashumans. C.Dolphinscanmakecorrectuseofmirror. D.Dolphinshavezitsjustlikehumans. 2Whatdomostanimalsregardtheirimagesinmirroras? A.Thecompetitorsofthem. B.Theirownreflections. C.Theirnaturalenemies. D.Othersoftheirkind. 3Whydidthedolphinslookintomirrormoreaccordingtothetext? A.Tolookfortheirpartners. B.Toshowtheirbelly. C.Towatchtheirownbeauty. D.Toconcernfortheirsafety. 4Whatisthebesttitleforthetext? A.Dolphins﹣sailors'friends B.Dolphins'reactiontothemirror C.Dolphinsaresmarterthanbefore D.Dolphinsareclevererthanhumans
已知是同一平面内的三个向量＝2﹣1． 1若＝03+λ与的夹角是求实数λ的值 2若＝2cosθ2sinθ⊥2﹣求在方向上的投影．
StanLeethewriterofsuperhero1characterincludingSpider﹣ManIronManandtheX﹣MendiedonNovember12attheageof95. IronManactorRobertDowneyJr.postedanoldphotoofLeeandhimself2accompanybythewordsIoweitalltoyou.ChrisEvanswroteonTwitterTherewillneverbeanotherStanLee.Fordecadesheprovidedboththeyoung3theoldwithadventureconfidencestrength4inspirefriendshipandjoy. LeewasborninNewYorkCity.Hebegan5writeforcomic连环漫画booksat19.HewroteunderthenameofStanLee.Heexplainedthatheusedafalsenamebecausehewantedtobeaseriousandgreatliteraturewritersomeday.Hedidnotwanthislink6comicbookstobeknowwhenthathappenedandyetitneverhappened.Withthepridein7heworkgrowinghedecidedto8legalchangehisnametoStanLee.Intheearly1960sinspiredbythecivilrightsmovementLee'sjobwastocreateaseriesofsuper﹣heroes9couldcompeteagainsttheJusticeLeagueofDCComicse.g.SupermanWonderWomanandBatman.AfterMarvelstartedmakinghollywoodfilmsStanLee10becomeahouseholdname.
WhenIleftfortheUnitedStatestostudyIhadbutterfliesinmystomach.IwasnervousbecauseIwasgoingto1newplacewithnewpeopleandnewcustoms.Icouldn'tevenunderstand2theylanguage.Everythingwasdifferent3myowncountry.TherewasnobodythatIcouldtalkto.Ijusthadmyhusband4wasanewpersonformetoo. ItwasasadmomentwhenIhadtosaygoodbyetomyfamilyandfriends.Ididn'twant5leavemyhometownbecauseIgrewupthereandhadwonderful6memoryoftheplace.So7thinkaboutallthesechangesmademenervousandIwas8worryaboutmynewlife.Butstudyingabroadwasa9decidethatImademyself.Ihadtocontinueandacceptthechallenge.Ilookedforwardto10visitmyfamilyinthesummervacation.
OnmyfirstdayofhighschoolIaskedaneleventhgraderwheremyclasswas.Andhetoldmeitwasonthefourthfloornexttothepool.Ifoundoutfiveminuteslaterthatwedon'tevenhaveafourthfloorandthere'snopooleither!BesidesthatIdidn'thaveanytroublewiththeolderkid. Ithinkthebiggestdifferencebetweenmiddleandhighschoolisthehomeworkload工作量andsizeoftheschool.IwentfrommaybefifteenminutesofhomeworkanighttoseveralhourssoIhadtolearnhowtomakefulluseoftime!Ourclasssizeisaround550butjoininginclubssportsmusicandotheractivitiesatschoolmakesiteasiertogettoknowpeopleineverygrade. ThebestadviceIcangiveabouttheyearsyouspendinhighschoolistolearnthingsforyourselfnotjusttogetagoodgrade.TherehavebeensomanyteststhatI'vepreparedforthenightbeforegottenanAandnotrememberedanythinglater.I'vechangedthatthisyearandIenjoyschoolsomuchmore.Don'ttakeeasyclassesjusttohaveasimpleyear.Ifyouhaveachoicebetweenchemistryandsportsthefirstwillprovetobealotmoreuseful! Whiledrinkingandsmokingmightbepresentinsomemiddleschoolsthey'realsoaroundinhighschool.Ihavealotoffriendswhopromisedthey'dneverdrinkorsmokebutarenowpartyingeveryweekend.Ifyouhavefunandspendyournightswastedinsteadofstudyingyouwillregretitwhenyou'reapplyingfor申请college.Thefriendswhosayyou'realoserfornotpartyingarereallynotyourfriendsatall.It'shardtoseeyourclosestfriendsgrowapartandgoindifferentdirectionsbutdon'tfollowtheirfootsteps.Createyourownpathinlifeandmakeyourowndecisions. 1Whatdoestheauthorthinkofhighschool? A.Thereareveryfewactivities. B.It'shardtomeetnewpeoplethere. C.Itrequireshardwork. D.Thereisn'tenoughtimeforhomework. 2Theauthoradviseshighschoolstudentsto. A.getreadyforteststhenightbefore B.giveupsports C.chooseusefulclasses D.trytheirbesttogetgoodgrades 3Thetextisprobablywrittenby. A.ahighschoolstudent B.achemistryteacher C.acollegestudent D.asportsplayer 4Thelastparagraphmainlytellsus. A.aboutthetroublecausedbydrinkingandsmoking B.nottogotoanypartyinhighschool C.nottoloseourselvesinhighschool D.abouttheimportanceofmakingfriends
假定你是李华.你的美国笔友Tom对中国文化有浓厚的兴趣.恰好你校今年暑假将为外国学生举办一场汉语夏令营活动ChineseSummerCamp请你给他发一封电子邮件邀请他加入内容包括 1.时间和地点 2.内容学习日常汉语了解中国历史和传统文化等 3.报名方式和截止时间.
2021年福建省高考实行“3+1+2”模式．“3+1+2”模式是指“3”为全国统考科目语文数学外语所有学生必考“1”为首选科目考生须在高中学业水平考试的物理历史科目中选择1科“2”为再选科目考生可在化学生物政治地理4个科目中选择2科共计6个考试科目． 1若学生甲在“1”中选物理在“2”中任选2科求学生甲选化学和生物的概率 2若学生乙在“1”中任选1科在“2”中任选2科求学生乙不选政治但选生物的概率．
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