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下列结构示意图中表示阳离子的是（ ）
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下列粒子结构示意图中表示阳离子的是
某粒子的结构示意图为右图填1若此示意图表示原子则n182若此示意图表示阳离子则n183若此示意图表示
下面是五种粒子的结构示意图①图中粒子共能表示种元素A所表示的元素属于元素填金属或非金属②图中表示的阳
下面是五种粒子的结构示意图⑴图中粒子共能表示种元素⑵图中表示的阳离子是用离子符号表示表示的阴离子是用
根据下列五种粒子的结构示意图回答问题1写出各结构示意图表示的粒子符号ABDNaE2图中表示阳离子是用
下列四种粒子的结构示意图中表示阳离子的是①②③④
①②③④
①②
③④
②④
根据下列五种粒子的结构示意图回答问题1写出各结构示意图表示的粒子符号ABDE2图中表示阳离子是用序号
下面是五种粒子的结构示意图1图中粒子共能表示种元素A.所表示的元素位于元素周期表的第周期2图中表示的
下面是五种粒子的结构示意图1图中粒子共能表示种元素A.所表示的元素位于元素周期表的第周期2图中表示的
下面是五种粒子的结构示意图①图中粒子共能表示种元素A.所表示的元素属于元素填金属或非金属②图中表示的
在下列粒子结构示意图中1表示原子的有________2表示具有稳定结构粒子的有________3表示
下面是五种粒子的结构示意图1图中粒子共能表示种元素.A所表示的元素位于元素周期表的第周期.2图中表示
下面是五种粒子的结构示意图1图中粒子共能表示种元素.2图中表示的阳离子是用离子符号表示表示的阴离子是
下面是五种粒子的结构示意图1图中粒子共能表示种元素A.所表示的元素位于元素周期表的第周期2图中表示的
下面是五种粒子的结构示意图1图中粒子共能表示种元素2图中表示的阳离子是用离子符号表示下同表示的阴离子
下列粒子结构示意图能表示原子的是_________表示阳离子的是_________表示阴离子的是__
下列粒子结构示意图中说法不正确的是
①④表示同种元素
②表示的元素在化合物中通常显+2价
①③④表示的都是离子
③④表示的都是阳离子
下面是五种粒子的结构示意图⑴图中粒子共能表示种元素⑵图中表示的阳离子是用离子符号表示表示的阴离子是_
有一粒子的结构示意图为若此示意图表示原子则n10填或＝若此示意图表示阳离子则n10填或＝若此示意图表
下面是五种粒子的结构示意图1图中粒子共能表示种元素A.所表示的元素位于元素周期表的第周期2图中表示的
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下列物质放入水中能形成溶液的是
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“大理石”是常见的筑装饰材料容易受到酸雨含硫酸的侵蚀原因是用化学方程式表示．
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30分Istoodonmygrandmother'sfrontporchwithmyson.Hehadabottleofbubbles.Youknowthe1it'sbasicallysoapywaterwithaplasticlooponeachend.Youdiptheloopinthebottle pullitoutandblowittomakebubbles.Mysonunderstoodtheprinciplebutwas2tryingtoblowbubbles.He3dipanddipandblowandblowbutalasnobubbles.He4methebottleandloopandaskedmeDaddycanyoumakebubbles? Ihadn'tblownbubblesinyears.Iama5byeducationfairlywell﹣trainedinsurfactant活性剂technology.Ihave6severalshampoossoIunderstandsurfacetensionandrelatedfoaming发泡沫characteristicsofsurfactants.Allthatknowledgeis7uselesswhentryingtoblowbubblesfromaloop8withsoapywater.Iwashavingno9successthanmyson.Idippedandpuffedstillnobubblesthesoapyfilmontheloopwouldjustpopwithout10anybubbles. Afterseveralfruitless111changedstrategies.12puffingontheloopofsoapywaterIgently13onit.Mysonscreamedwithdelightasabigbeautifulbubbleformedand14away.Hegrabbedtheloopdippedandblew.Nobubbles.I15tohimSonyoucan'tblowhard.Youmusteversogentlybreatheonthelooptomakebubbles.Hecontainedhisurgent16tomakebigbubblesbyblowinghardand17myadvice.Bigbubbles. Therearesomethingsthatyoucangetwith18forcebutotherthingslikeloveorrespectonly19thegentlenessofasoftbreath.The20somethingistohigherspiritthemoreitislikebubblesitcan'tbeforced.Blowbeautifulbubblesbreatheeasy. 1A.type B.color C.size D.liquid 2A.excitedly B.willingly C.quickly D.vainly 3A.could .B.would C.might D.should 4A.handed B.lent C.sent D.brought 5A.teacher B.doctor C.chemist D.physicist 6A.bought B.designed C.developed D.used 7A.nearly B.hardly C.partly D.completely 8A.filled B.loaded C.dotted D.crowded 9A.less B.much C.more D.little 10A.flying B.forming C.keeping D.taking 11A.attempts B.performances C.experiments D.adventures 12A.Inadditionto B.Otherthan C.Insteadof D.Inspiteof 13A.touched B.breathed C.felt D.tapped 14A.rushed B.jumped C.dropped D.floated 15A.explained B.whispered C.complained D.shouted 16A.anger B.desire C.manners D.dream 17A.heard B.followed C.shared D.refused 18A.mild B.weak C.powerful D.flexible 19A.resultin B.cometo C.consistof D.arisefrom 20A.dearer B.farther C.smaller D.closer
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25分2019年元宵节LanternFestival故宫首次开放衣场旅游盛况空前假定你是李华你的朋友Jack参观了元宵故宫灯会lanternshow.现你校文学社LiteratureClub要征集役游故宫灯会经历的稿件请你写一封电子邮件邀请Jack投稿内容包括 1.稿件主题夜游故言灯会经历和感受 2.截止日期2019年3月31日 3.投稿方式邮箱20190678@qq.com 注意1.词数100左右 2.可适当增加细节以使行文连贯. DearJack Yours LiHua
8分Ifyouaskmostpeoplewhatwatertasteslikethey'llprobablytellyouthatwaterhasnotasteandtheymaygiveyouafunnylook.Butifyouwereafruitflyaskinganotherfruitflythatquestionmighthaveadifferentanswer. Toafruitflywaterhasataste.Scientistswanttoknowhowthefruitflyknowswaterbecausethisinformationmayhelpinlearninghowotheranimalsmanagetousewaterintherightway.Waterisveryimportanttolifebuttoomuchortoolittlecanbedeadlytoalivingcreature.Sobyunderstandinghowthefruitflytasteswaterresearchersmaylearnmoreaboutotherlivingthings. AccordingtothenewstudyaproteincalledPPK28makesitpossibleforaflytotastewater.Proteinsbuildcellsandtissuesfightdiseaseandcarrymessagesbetweencells.It'snotsurprisingthataproteinisresponsibleforthefruitfly'sabilitytotastewater. ThePPK28proteinispartofalargerfamilyofsimilarproteins.Oneoftheserelatedproteinsisusedbymammalsincludinghumanstotastesalt.Scientistshavenotfoundaproteinthatenableshumanstotastewater.IntheexperimentCameronandhisteamcomparednormalfruitflieswithfruitflieswhosetastecellshadhadbeendisabled.ThefruitfliesweregivenaspecialchemicalthatwouldglowwhentheflyusedthePPK28protein.Thenthescientistsledthefliestowater.WhenthenormalfliestastedthewaterthePPK28proteinlitup﹣showingthatitwasinuse.Thefruitflyinparticularissointerestingthatsomescientistsarehardatworkcreatingacompletemapofthefruitflybrain.Thismapwillshowallofafly'sneuronsandhelpscientistsunderstandhowtheneuronsworktogether. 1Howdomostpeoplefeelwhenaskedthetasteofwater? A.Disappointed B.Frightened. C.Amused D.Disgusted. 2Whydoscientistswanttounderstandhowthefruitflyknowswater? A.Todecreasethenumberofthefruitfly. B.Toknowmoreaboutothercreatures. C.Tomanagetousewatercorrectly. D.Todescribethetasteofwater. 3WhatdoweknowaboutthePPk28protein? A.Itcanmakehumanstastesalt. B.Itenablesthefruitflytotastewater. C.Thefruitflycan'tlivewithoutit. D.Thefruitflyusesittoavoidillnesses. 4Whatwillthescientistscontinuetoworkat? A.MakingthePPk28protein. B.Tellingmoreinformationaboutcells. C.Creatingmapsofhumanbrains. D.Studyingthefruitfly'sneuronsystems.
7.5分IntheU.S.stateofWashingtonaroadcalled^Interstate90^cutsthroughawildmountainousareatoreachthecityofSeattle.Forthearea'smanykindsofanimalsthebusyhighwaygreatlylimitstheirmovements.Crossing1﹣90﹣astheroadiscalled﹣isariskybutsometimesnecessaryact.Butsoonanimalswillhaveasaferchoiceforcrossingtheroad.Theywillbeabletogoaboveit. Tohelptheanimalsthestateisfinishingworkonitslargest﹣everwildlifebridge.The11﹣meter﹣tall20﹣meter﹣widestructurebeginsintheforest.Itformstwoarchesabovethehighwayoneforeachdirectionoftraffic.Workersareaddingfencingandplantstohelpguidetheanimalsacrossthebridge.Two﹣meter﹣thickwallswillhelpblocknoisefromvehiclesbelow. The1﹣90BridgeispartofagrowingnumberofwildlifecrossingsacrosstheUnitedStates.Somearefencessomeareoverlandbridgesandsomeareunderpasses.Theyallaimtokeepdriversandanimalsawayfromeachother.Collisionsbetweenanimalsanddriversarerarelydeadlytopeople.Buttheyareoftendeadlytowildlife.InCanada'sBanffNationalParkstudieshavefoundthatwildlifecrossingsreducethearea'sanimal﹣drivercollisionsby80percent. Mostofthewildlifebridgesareinwesternstates.Butexpertshavenotedmanyotherareasthathaveaneedforsuchpaths.JenWatkinswhoseorganizationhashelpedcampaignforanimalcrossingssaysftindformorecrossingsisthenumber﹣onebarrier. PattyGarvey﹣DardaoftheU.S.ForestServicehasworkedonthe1﹣90crossingfromthestartoftheproject.Shesaysthe﹩6﹣millionbridgewillonedaypayforitselfbecausethehighwaywillnothavetobefullyorpartlyclosedeachtimealargeanimalisstruck.ShesaidIfyoushutdownInterstate90youshutdowninterstatecommerce. 1WhatisthepurposeofbuildingthebridgeoverInterstate90? A.Toreducehumandeathsincrashwithwildlife. B.Topreventwildlifefrombeingstruckbyvehicles. C.Toarousepublicawarenessofwildlifeprotection. D.Toprovideasaferchoicetocrosstheriskyroad﹣ 2AccordingtoJenWatkinswhatisthebiggestchallengeincrossingconstruction? A.Findingwaystohelpguideanimalsacrossthebridge. B.Collectingmoneytobuildmorewildlifecrossings. C.Locatingareastoconstructappropriatecrossings. D.Encouragedriverstoobeytheregulationsoftraffic. 3WhatdotheunderlinedwordsinParagraph5imply? A.Thebridgewillprovetobewellworththehighprice. B.Expenseforbuildingsuchbridgeswillbereduced. C.Thebridgewillgreatlypromotetradeandcommerce. D.Livessavedthroughthebridgearedefinitelybeyondprice.
铜可用于制造传统的炭火锅下列性质与此用途无关的是
干冰常用于人工降雨利用了干冰的性质．
化学晚会上小明表演了一个小魔术﹣﹣“矿泉水”变成“牛奶”“雪碧”和“红酒”．回答下列问题 1“矿泉水”实际是石灰水加入液体A后出现白色浑浊形似牛奶该过程发生反应的化学方程式为． 2“牛奶”中加入B有大量气泡产生变成雪碧则B物质是该过程发生的化学反应最多有个． 3C是一种紫色的溶液滴入“雪碧”中变为红色则雪碧的组成是．
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