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设等差数列{an}的前n项和为Sn且a4＝8a1＝2则S5﹣S3＝
XYZW是前四周期中常见的元素．X的基态原子核外电子共占据5个原子轨道其中能量最高的能级上的电子有3种运动状态Y能形成酸性最强的无机含氧酸Z是前36号元素中第一电离能最小的元素W3+的未成对电子数等于基态XYZ原子的未成对电子数之和． 请回答下列问题 1X元素所在周期中第一电离能最大的主族元素形成的单质与水发生置换反应其化学方程式是．基态W原子的价层电子排布图为． 2在上述元素的含氧酸中呈三角锥形的阴离子是XY3分子中X原子的杂化类型为其分子属于填“极性“或“非极性”分子． 3ZX3化合物中含有的化学键类型是．已知WY3的沸点为319℃熔点为306℃加热WY3晶体时需要克服的粒子间作用力类型是． 4Z单质的晶胞如图所示Z原子的半径为rcmZ单质的密度为ρg•cm﹣3NA代表阿伏加德罗常数的值则Z单质的摩尔质量表达式为． 5CN﹣是常见的配体中学实验中常用配合物Z4[WCN6]溶液检验W2+该配离子的中心粒子的配位数为．
假如你是李华学校最近要组织一次英语演讲比赛主题为垃圾分类益处多.请你根据此话题写一篇演讲稿.要点如下 1.你的观点 2.你的建议. 参考词汇垃圾分类garbageclassification 注意 1.词数80左右 2.可适当增加细节以使行文连贯
某莲藕种植塘毎年的固定成本是1万元毎年最大规模的种植是8万斤毎种植一斤藕成本增加0.5元如果销售额函数是是莲藕种植量单位万斤销售額的单位万元a是常数若种植2万斤利润是2.5万元则要使利润最大毎年种植莲藕
TheJapanesehavealwaysbeenattheforefrontatdeploying利用robotstoperformjobsthataretraditionallydonebyhumans.OverthepastyearhumanoidrobotshavebeenseenhelpingcustomersattheMitsubishiBankandevenfillinginforhumansciencecommunicatorsatmuseums.ThereforeitisnotsurprisingtohearthatthecountryhastheworldsfirsthotelthatisstaffedalmostentirelybytheAndroids! Theaptly巧妙地namedHenn﹣nastrangeinJapaneseHotelwhichopeneditsdoorsonJuly17islocatedatNagasaki'sHuisTenBoschthemepark.ItistheideaofHideoSawadaaJapanesebusinessmanwhoisfascinatedbythepossibilityofreplacinghumanswithrobots.Hisaimistohavethisfuturistichotelberunmainlybytheintelligenthumanoids. Guestschecking﹣inarewelcomedbyafamilyfriendlyEnglish﹣speakingrobotwearingabowtieandbell﹣hop侍者hat.Thoughexperiencedathisjobhedoesrequestguestsnottoaskhimadifficultquestionsinceheisafteralljustarobot!Thoseseekingamoreregularexperiencecanapproachthehuman﹣likeJapanese﹣speakingrobot. Whenreadyvisitorscanrequesttherobotporterstohelpcarrybelongingstotheirroom.Thosethatneedtostowawayvaluablescanhandthemtoahelpfulrobotwhowillplacetheminsideanindividualsafeboxinexchangeforasmallfee.Aone﹣foot﹣highconcierge管理人isavailabletoprovideinformationaboutthehotel'samenities便利设施nearbyattractionsandevenorderataxiifneeded. Sohowmuchdoesitcosttoliveinthiscrazycoolhotel?Itdependsonwhenyoudecidetogo.Duringthelowseasonguestscangetawaywithpayingaslittle﹩60anightforabasicroom.Howeverduringthepeakseasonwhenratesaredeterminedbyanonlineauctionthepricecangetashighas﹩153. 1WhatisHideoSawadainterestedin? A.Makingdifferentkindsofrobots. B.Takingtheplaceofhumanswithrobots. C.Settingupmorehotelsrunbyrobots. D.Makingrobotsmoreintelligent. 2Fromthethirdparagraphwecanknowthat. A.theJapanese﹣speakingrobotwelcomestheguests. B.thehumanlikerobotcanspeakJapaneseandEnglish. C.thehuman﹣likerobotisbetterskilledatitsjobthantheotherrobots. D.theEnglish﹣speakingrobotcananswersimplequestions. 3Theunderlinedphrasestowawaymostprobablymeans. A.purchase B.change C.store D.replace 4Whatcouldbethebesttitleforthepassage? A.World'sfirstrobot﹣staffedhotelisopenforbusiness. B.Japanesetopsthefirstinmakingrobots. C.RobotscanreplacehumansinJapanesehotels. D.TheaptlynamedHenn﹣naHotelatathemepark.
调节0.001mol•L﹣1CH3COOH溶液的pH溶液中微粒浓度的负对数﹣lgc与pH的关系如图所示标“△”’及“▲”的曲线分别表示CH3COO﹣及CH3COOH变化情况．下列说法错误的是
如图在等腰梯形ABCD中AB∥CDCD＝2+BC＝2BF＜BC梯形ABCD的高为+1E是CD的中点分别以CD为圆心CEDE为半径作两条圆弧交AB于FG两点． 1求∠BFC的度数 2设图中阴影部分为区域Ω求区域Ω的面积．
已知函数y＝2x在区间[01]上的最大值为a则抛物线＝ax的准线方程是
已知实数xy满足不等式组则z＝x﹣y+3的取值范围是
若x+2x+m=x2-x-6则m的值为
已知函数fx＝|x﹣a|+|x+3|a∈R． 1若函数fx的最小值为2求实数a的值 2若当x∈[01]时不等式fx≤|5+x|恒成立求实数a的取值范围．
阿基米德是古希腊伟大的哲学家数学家物理学家对几何学力学等学科作出过卓越贡献为调查中学生对这一伟大科学家的了解程度某调查小组随机抽取了某市的100名高中生请他们列举阿基米德的成就把能列举阿基米德成就不少于3项的称为“比较了解”少于三项的称为“不太了解”调查结果如下 1完成如下2×2列联表并判断是否有99%的把握认为了解阿基米德与选择文理科有关 2抽取的100名高中生中按照文理科采用分层抽样的方法抽取10人的样本 i求抽取的文科生和理科生的人数 ii从10人的样本中随机抽取两人求两人都是文科生的概率 参考数据 K2＝n＝a+b+c+d
设函数fx＝1﹣ax2﹣2+a2x3a∈R． 1求函数fx的零点 2若a＜1关于x的不等式解集为αβ证明[2ln1﹣a﹣2ln3+2]β﹣α≤1．
MyfatherwasborninasmalltownintheUS.Hewasn'tsurewhathewantedfrom1butsomethingtoldhimto2andbeginanewadventure. HebeganthatadventuretravelingtocitiesintheUSbeforegoingontoAustraliaNewZealandandthePhilippines.Hetookmymotherandusthreedaughterswithhimandwentwherevertheroad3him. It'seasytofeel4whenyou'reontheroad.Wemadelotsofnewfriendsonourtrip﹣mostofthemaremechanicssinceweoften5hoursinrepairshops.Butthatwasawaymuch6thansittingbytheroadsidewhilewaitingfortheengineto7whenitwas40℃outside. Gettingalongwellsometimesseemed8.Therewerealwaysalotof9especiallyamongusback﹣seatpassengersaboutwhohadto10inthemiddle.Butevenifitwashardwelearnedalotabout11.WhenweweretravelinginthePhilippineswedrovetoQuezonCityoneday.Itshouldhavebeenanhour'sdrivebutwasnearlythreethankstobadroadsand12traffic.Didyouputoursuitcasesinthecar?myfatheraskedmymotheraswearrivedthere.Fromthebackseatwesawher13turntowardmyfather.Noshesaid.Ithoughtyoudid.Thatwashowaseven﹣hourcartripturnedintoa16﹣houronewhichwasmostlyspentin14. Onoccasionslikethatwehadtolearntoletgoofourangerbecausewewere15inarollingboxwiththesamepeoplefortherestofthe16.EvenifIsometimesfeltlikeopeningthecardoorand17oneofmysistersoutIkeptmyfeelingstomyself. Thisiswhyroadtripswerelike18universitiestous.We19ourPHDs博士学位inhowtogetalongwithotherpeoplejustbytravelinginouroldcar. Ifwewere20givenasecondchanceatlifewewoulddoitalloveragain.OnlythistimewouldIputthesuitcasesinthecarmyself. 1A.move B.life C.experience D.belief 2A.liveup B.struggleon C.getout D.walkaround 3A.took B.drove C.served D.controlled 4A.anxious B.upset C.helpless D.lonely 5A.wasted B.worked C.spent D.chatted 6A.better B.easier C.safer D.cleverer 7A.breakdown B.cooloff C.clearup D.turnover 8A.available B.alternative C.necessary D.impossible 9A.arguments B.fights C.embarrassments D.amusements 10A.settle B.rest C.sit D.watch 11A.sharing B.respect C.communication D.tolerance 12A.light B.thick C.local D.fast 13A.suddenly B.sensitively C.calmly D.slowly 14A.silence B.vain C.panic D.disappointment 15A.buried B.crazy C.stuck D.impatient 16A.holiday B.journey C.exploration D.march 17A.dragging B.pushing C.helping D.sending 18A.unusual B.common C.free D.mobile 19A.earned B.expected C.missed D.valued 20A.somewhere B.anytime C.somehow D.anyway
假定英语课上老师要求同桌之间交换修改作文请你修改同桌写的以下作文.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. DearKate Ihavegoodnewstotellyou.TheWorldAdolescentRoboticsCompetitionwillheldinShanghaiattheendofJuly.HearthatyouoncetookpartinthecompetitionlastyearandwonanawardIintendtoinviteyoutojoininourteaminthecomingcompetition.Iamsurethatyourinvolvementwillnotonlyhelpuswintheawardandalsostrengthenthefriendshipbetweenourschool. Nowtheyarepreparingforthecompetitionactively.BecauseyouhadmoreexperiencethanusIalsosendyouourtrainingplanaboutthatIwishtogetyouradvice.Wesincerehopethatwecanparticipateinacompetitionasteampartners. I'mlookingforwardtoyourreply. Yours LiHua
已知集合A＝{x|x＝x2}B＝{1m2}若A⊆B则实数m的值为
下列有关甲苯的说法正确的是
Roughlythesizeofasodacansittingonabookshelfarelativelyharmlessdevice设备maybeturningfriendsawayfromyourhome.TheelephantinyourlivingroomisyourInternet﹣connectedcameraadevicepeopleareincreasinglyusingforpeaceofmindintheirhomes.Butfewstoptothinkabouttheeffectthesedevicesmayhaveonhouseguests.Shouldyoutellyourfriendsforinstancethatthey'rebeingrecordedwhileyouallwatchthebiggametogether? It'scertainlynewterritoryespeciallyashomesecuritycamerasbecomeeasiertofixsaysLizziePostpresidentoftheEmilyPostInstituteAmerica'sdistinguishedmannersadvisors.Ithinkitwillbeveryinterestingtoseewhatmannersappearintermsofwhetheryoutellpeopleyouhaveacameraornotandwhetherguestshavearighttoaskthatitbeturnedoffifit'snotasecurityissue.Postwantstomakeclearthatshe'snottalkingaboutlegalrightsbutratherpersonalpreference. WhenitcomestosecuritycamerasPostsaysit'sahost'sresponsibilitytomakesureguestsfeelcomfortablewithintheirhome.Ifthehostcasuallyacknowledgesthatthereisacameraintheroombytellingastoryaboutitthatmaybeenoughtoprovideanopeningforaguesttosayiftheyareuncomfortable. Howeverifacontractor合约工isworkinginyourhomeyoudon'tneedtotellthemthattherearecameraswatching.Thenagainthecameracanalsoworkincontractors'favor.Ifanythingdoesgowrongwhilethey'reinthehousetheydon'twanttobeblamedforitshesays.Infactthecameracouldbethethingthatprovesthattheydidn'tstealthe﹩20orknockthevaseoffthetable. 1Thevisitorsarcconcernedthatthesecuritycameramay. A.threatentheirhealth B.spoiltheirpeaceofmind C.disturbtheirprivacy D.affecttheirpreference 2Whatisahost'sresponsibilityconcerningthesecuritycamera? A.Indicatingitsposition. B.Makingtheirguestsfeelatcase C.Turningitoilintime. D.Havingacasualtalkwithguests. 3Howcanthehonesecuritycamerabenefitcontractorsworkinginyourhome? A.Itcanpreventtheaccidentshappening. B.Itcanprovetheirinnocence. C.Itcanrecordtheirworkingprogress. D.Itcanmaketheirworkmoreenjoyable. 4What'stheauthor'sattitudetowardsthesecuritycamera? A.Negative. B.Pessimistic. C.Favorable. D.Objective.
Ihadreachedtheageoftwenty﹣eight.StillI1whethertheletterfrommypastwouldmakeittomealltheseyearslater.Itwasa2writingtaskfromwhenIwaseighteen.Theteachercollectedourletterstoour3selvesinself﹣addressedenvelopewithstampsandpromisedto4themtenyearslater.Butsincesomuchtimehadpassedwouldheeven5? Thinkingbackonthe6Irecalledgivingmyfutureselfsomeadvice.Whenyou'reeighteenYearsoldtwenty﹣eightseemslikea7agebutIwasn'tfeelingasmatureasIbelievedmyyoungerselfhad8metobe. WhentheletterfinallyreachedmeIopenedit9.ItbeganHowmuchdoyoubetthisletterwillnevergettoyou?Itcontinuedtogreetmecasually10wewerehavinganIMinstantmessagingchat.Asaseniorinhighschoolfacingthe11SATSandcollegeapplicationmyeighteen﹣year﹣oldselfwasso12!ShewasapparentlynotquitehappyandhopedIwouldn'tworrysomuchinthefutureandthatIwouldn'tforgettobepresentand13mylife! 14tomybeliefmyeighteen﹣year﹣oldselfdidnothaveanydemandsofmeorexpectationsImighthave15meet.InsteadshewroteI'll16whateveryoudo.EvenifyouarenottheoneI'mimaginingnowI'llsupportyoubecausemaybe17I'mimaginingissomeoneelsebutyou'renotsomeoneelseyou'reme. Iwas18andtearswelledupinmyeyesatthis19throughtime.IhadputalotofpressureonmyselftobethebestversionofmyselfthatIcouldbe.20IcametorealizewhatIwouldhaveaccomplishedintenyearswouldpaleincomparison相形见细tohowI'dfeelandwhoI'dbe. 1A.believed B.bet C.doubted D.considered 2A.hopeless B.creative C.urgent D.tough 3A.inner B.happy C.future D.young 4A.correct B.mail C.answer D.write 5A.remember B.understand C.mind D.remain 6A.application B.comment C.study D.letter 7A.grown﹣up B.happy C.made﹣up D.promising 8A.promised B.convince C.encouraged D.expected 9A.calmly B.cautiously C.eagerly D.naturally 10Aevenif B.sothat C.nowthat D.asif 11A.appearing B.arriving C.approaching D.approving 12A.depressed B.ambitious C.carefree D.stressed 13A.enjoy B.value C.start D.earn 14A.Contrary B.Honest C.Surprised D.Strange 15A.triedto B.failedto C.managedto D.determinedto 16A.standfor B.standwith C.standby D.standout 17A.what B.who C.which D.that 18A.guilty B.touched C.embarrassed D.nervous 19A.self﹣acceptance B.self﹣service C.self﹣defense D.self﹣concern 20A.Besides B.Therefore C.Then D.However
“x2＞1”是“﹣x2＜﹣4”的
下列过程的反应中没有电子转移的是
对炼锌厂的铜镉废渣中各元素进行分离能减少环境污染同时制得食品锌强化剂的原料ZnSO4•7H2O实现资源的再利用．其流程图如下． [相关资料] ①铜镉废渣中含有铜锌镉铁砷等元素其含量依次减少． ②FeAsO4难溶于水ZnSO4•7H2O易溶于水难溶于酒精． ③ZnOH2属于两性氢氧化物． ④滤液I中有Fe2+Zn2+Cu2+Cd2+和少量的AsO33﹣ ⑤有关离子沉淀完全的pH 请回答下列问题 1提高铜镉废渣浸出率可以采用的方法是写出其中一点即可 2向滤液I中逐滴滴人酸性KMnO4溶液可与AsO33﹣发生反应生成FeAsO4写出该反应的离子方程式加入酸性KMnO4溶液不能过量判断该滴定终点的现象是滤渣Ⅱ中除了FeAsO4外还有 3制得的ZnSO4•7H2O需洗涤洗涤晶体时应选用试剂为 4上述流程除了实现对这些元素进行提取分离能减少环境污染同时制得ZnSO4•7H2O实现资源的再利用还可以得到副产物 5回收所得的Cd可用于制造镍镉碱性二次电池电池的工作时正极NiOOH转化为NiOH2则充电时电池的正极反应式为 6若a克铜镉废渣含有bmolFe元素加入了cmolKMnO4则铜镉废渣中As元素的质量分数为．不考虑镉元素与KMnO4的反应
已知直线x＝m与双曲线C＝1a＞0b＞0的两条渐近线分别交于AB两点若△AOBO为坐标原点的面积为且双曲线C的离心率为则m＝．
已知各项都为正数的等比数列{an}的前n项和为Sn若a3a7＝256S4﹣S2＝12则S6＝
设NA为阿伏加德罗常数的值下列叙述正确的是
如图一只蚂蚁从点A沿数轴向右直爬2个单位到达点B设点A表示-点B所表示的数为m则m-1²=．
7.5分Iusedtobecrazyaboutthehuntingseason.Theexcitementofwaitingforaprey猎物andtheprideofshowingoffthekillfascinatedme.Howevereverythingchangedafterthatcoldmorning. EarlyonthatdayofthelatefallIsetoffaloneforthewoodspackingagunabottleofhotcoffeeandthreethicksandwiches.Afterfindingthefreshdeer'stracksinthesnowIsettleddownbehindalittlebush. Isatthereforaboutanhour.ItwasthenthatIsawhim.Adeerabigbeautifuldeer!Therewasnocovernearertohimthan30yards.SurelyIcouldn'tmiss!IwaitedforhimtorealizeIwasthere.Iwaitedforhimtobeshockedandrunaway.Buthefooledmecompletely.Hecametowardsme!HewascuriousIsupposeormaybeliewasstupid﹣﹣﹣howelsecanyouexplainit?WellthatdeerwalkedrightuptowhereIwassitting.Thenhestoppedandlookedatme! Whathappenednextishardtobelievebutit'strue.Anditallseemedquitenatural.JustaswhenafriendlyyoungdeercomesnearyouIreachedupandscratchedhishead.Andhelikedtobescratched.Infacthepracticallyaskedformore.ThenIfedhimmysandwich!YesIknowwhatadeereatsbutthatdeeratemysandwich.Wellhefinallywenthiswaydownthehillandupthedeertrail.Shoothim?Notme.Youwouldn'thaveeithernotafterthat.Ijustwatchedhimgo. WhenIwasabouthalfwaybackIheardtwoshotsfollowedbyadullslam撞击afewsecondslater.Thosetwoshotsusuallymeanakill.Ihadforgottentherewereotherhuntersthatday. Thosehunterswouldneverknowtheycouldhavescratchedhishead. 1Whydidn'ttheauthorkillthedeer? A.Hepreferredtoshootashydeer. B.Hewasfooledbythetrickydeer. C.Hewassympatheticforthedeer. D.Hewastooshockedtoshootthedeer. 2Whatmostprobablyhappenedtothedeerintheend? A.Otherhuntersshotthedeertodeath. B.Otherhuntersscratchedthedeer'sheadtoo. C.Thedeermanagedtoescapefrombeingshot. D.Thedeerwouldbecomefriendswiththeauthor. 3What'sthebesttitleofthistext? A.AHuntinginLateFall. B.ALovelyDeer. C.TheCruelKilling. D.TheLastHunting.
4的算术平方根是
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