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铁和铜都是日常生活中常见的金属，有着广泛的用途．请回答下列问题： （1）配合物Fe（CO）x常温下呈液态，熔点为﹣20.5℃，沸点为103℃，易溶于非极性溶剂，据此可判断Fe（CO）x晶体属于 ...
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高三下学期化学《》真题及答案
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铝铁铜是生活中常见的金属下列关于它们的叙述错误的是－
铝能制成铝箔是因为铝具有良好的延展性
生活中广泛使用的铁制品大多数是铁合金
三种金属中铝最活泼
三种金属都能与稀硫酸反应
在铜铁锌三种金属中金属活动性最弱的是________在工农业生产和日常生活中使用量最大的是_____
下列框图所示的物质转化关系中甲是日常生活中常见的金属乙丙丁是常见的气体单质气体B.与气体C.相遇产生
金属和金属材料在日常生活中被广泛应用.下列对金属或合金的利用是由金属的活动性决定的是
用铁回收含铜离子废液中的铜
用铝合金制作门窗框架
用锡合金作保险丝
用铜丝作电缆
日常生活中常见的铁桶可以用该桶盛放的是
盐酸
稀硫酸
水
硫酸铜溶液
金属在日常生活中有着广泛的用途常见金属的活动性顺序如图所示请回答下面问题1金属活动性顺序表中的X是元
金属在日常生活中有着广泛的用途常见金属的活动性顺序如图请回答下面问题1金属活动性顺序表中的X.是Hg
金属和金属材料在生活和生产中有着广泛的应用.请回答下列问题1铁制炊具通常需要加上木柄或者塑料柄这是因
铝铁铜是生活中常见的金属下列关于它们的叙述错误的是
铝是地壳中含量最多的金属
生活中广泛使用的铁制品大多数是铁合金
三种金属的活动性顺序：铝＞铁＞铜
三种金属都能与稀硫酸反应
金属在日常生活中有着广泛的用途常见金属的活动性顺序如图请回答下面问题1金属活动性顺序表中的X.是元素
日常生活中常见的金属大部分是合金
金属材料在生产生活中有着广泛的应用人类的生产和生活都离不开金属1新型材料纳米级铁粉具有广泛的用途它比
写出日常生活中常见的三种无机非金属材料__________________________
金属材料在日常生活中被广泛应用下列对金属或合金的利用是由金属活动性决定的是
用铁回收含铜离子废液中的铜
用铝合金制作门窗框架
用锡合金作保险丝
用铜丝作电缆
金属在日常生活中有着广泛的用途常见金属的活动性顺序如图请回答下面问题1金属活动性顺序表中的X.是__
金属材料在日常生活以及生产中有着广泛的运用下列关于金属的一些说法不正确的是
工业上金属Mg、Al都是用电解熔融的氯化物制得的
合金的性质与其成分金属的性质不完全相同
金属冶炼的本质是金属阳离子得到电子变成金属原子
越活泼的金属越难冶炼
铝铁铜是我们生活中常见的金属.1下列生活用品中主要利用金属具有良好导热性的是填序号.2铝具有很好的抗
下列生活中常见的金属能与盐酸反应的是
金
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铁
金属材料在日常生活以及生产中有着广泛的应用下列关于金属的一些说法不正确
合金的性质与其成分金属的性质不完全相同
工业上金属Mg、Cu都是用热还原法制得的
金属冶炼的本质是金属阳离子得到电子变成金属原子
越活泼的金属越难冶炼
铁是日常生活中常见的金属它的下列性质中属于铁的化学性质的是
铁表面有银白色的金属光泽
铁有导热性
铁在潮湿的空气中易生锈
铁质软
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已知R为实数集集合A＝{x|x2﹣4x﹣5＞0}则∁RA＝
已知数列{an}为等差数列a1＝3S5＝35数列{bn}的前n项和为Sn且3bn＝2Sn+3． 1求数列{an}和{bn}的通项公式 2设cn＝anbn求数列{cn}的前n项和Tn．
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Ashewasnotallowedtohertotheshopshewroteoutalistofitemsforher. A.appointment B.accompany C.ambulance D.adjustment
Manyteensinhighschoolwanttotryoutforsportsbecausetheythinkplayingsportswillmakethemmorepopular.Buttherearelotsofother1benefitofsportsthatteensmayoverlook. WithTVmoviescomputersandvideogames2becomemoreandmorepopularithasbecomemuch3easyforteenstobehomebythemselvesratherthangoingoutwithfriends.Teensusedtohangoutatthemallordrivearoundthetownnowtheyjustsitathome.Gettingteensintoasport4givethemanopportunitytogooutandsocialize.5theymaynotfindanewbestfriendtheywilllearnhowtointeractandworkas6teamsomethingthatthey'llfind7uselaterinlife. Moreandmoreteensarebecomingoverweight.Ifteensseethattheirphysicalconditioniscausingthemtoperform8badtheymaybemotivatedtodootheractivities9gethealthy.Whenyourchildrenreachtheiryouthpartofgoodparentingwillprovidethem10thedirectionandencouragementandcontinuetohelpthemdevelopahealthystyleofliving.
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从某企业生产的某种产品中抽取500件测量这些产品的一项质量指标值由测量结果得如下频率分布直方图 Ⅰ求这500件产品质量指标值的样本平均数和样本方差s2同一组中数据用该组区间的中点值作代表 Ⅱ由直方图可以认为这种产品的质量指标值Z服从正态分布Nμσ2其中μ近似为样本平均数σ2近似为样本方差s2． i利用该正态分布求P187.8＜Z＜212.2 ii某用户从该企业购买了100件这种产品记X表示这100件产品中质量指标值位于区间187.8212.2的产品件数利用i的结果求EX． 附≈12.2． 若Z～Nμσ2则Pμ﹣σ＜Z＜μ+σ＝0.6826Pμ﹣2σ＜Z＜μ+2σ＝0.9544．
在Rt△ABC中∠A为直角AC边所在直线的方程为x﹣2y﹣4＝0点﹣34在直线AB上斜边中点坐标为20． 1求直线BC的方程 2设圆G为Rt△ABC的外接圆若圆G上存在两点PQ使得PQ关于y轴的对称点在直线ax+y+4＝0上求a的取值范围．
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Ialwaysfeltsorryforthepeopleinwheelchairs.Somepeopleoldandweakcannotgetaroundbythemselves.Othersseemperfectlyhealthydressedinbusinesssuits.ButwheneverIsawsomeoneinawheelchairIonlysawadisabilitynotaperson. ThenIfainted晕倒atEuroDisneyduetolowbloodpressure.ThiswasthefirsttimeIhadeverfaintedandmyparentssaidthatImustrestforawhileafterFirstAid.IagreedtotakeiteasybutasIsteppedtowardsthedoorIsawmydadpushingawheelchairinmydirection.FeelingcolorburnmycheeksIaskedhimtowheelthatthingrightbacktowherehefoundit. Icouldnotbelievethiswashappeningtome.Wheelchairswerefineforotherpeoplebutnotformeasmyfatherwheeledmeoutintothemainstreetpeopleimmediatelybegantotreatmedifferently. Littlekidsraninfrontofmeforcingmyfathertostopthewheelchairsuddenly.BitternesssetinasIwasthrownbackandforth.Stupidkids…theyhaveperfectlygoodlegs.Whycan'ttheywatchwheretheyaregoing?Ithought.Peoplestareddownatmewithpityintheireyes.Thentheywouldlookawaymaybebecausetheythoughtthesoonertheyforgotmethebetter. I'mjustlikeyou!Iwantedtoscream.Theonlydifferenceisyou'vegotlegsandIhavewheels. Peopleinwheelchairarenotstupid.Theyseeeverylookandheareachword.LookingoutatthefacesIfinallyunderstoodIwasoncejustlikethem.Itreatedpeopleinwheelchairsexactlythewaytheydidnotwanttobetreated.Irealizeditissomeofuswithtwohealthylegswhoaretrulydisabled. 1Theauthoroncewhenshewashealthy. A.showedrespectedtodisabledpeople B.lookeddownupondisabledpeople C.imaginedherselfsittinginawheelchair D.sawsomehealthypeoplemovingaroundinwheelchairs 2Facingthewheelchairforthefirsttimetheauthor. A.feltcuriousaboutit B.gotreadytomovearoundinitrightaway C.thoughtitwasreadyforherfather D.refusedtoacceptitrightaway 3Theexperienceoftheauthortellsusthat. A.lifeisthebestteacher B.peopleofteneattheirbitterfruit C.lifeissochangeablethatnobodycanpredict D.oneshouldneverdoestootherswhathewouldnotlikeothersdotohim 4Whichisthebesttitleforthispassage? A.HowtoGetUsedtoWheelchairs B.WheelchairsAreasGoodasTwoLegs C.PeoplewithTwoLegsAreTrulyHealthy D.TheDifferenceBetweenHealthyPeopleandtheDisabled
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已知抛物线y2＝4x的焦点为F准线为l．若l与双曲线﹣＝1a＞0b＞0的两条渐近线分别交于点A和点B且|AB|＝4|OF|O为原点则双曲线的离心率为
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设p“方程x2+y2＝a+4表示圆”q“方程＝1表示焦点在x轴上的双曲线”如果“p∧q”是假命题且“p∨q”是真命题求实数a的取值范围．
在各项均为正数的等比数列{an}中若log2a2+log2a8＝1则a3•a7＝．
在等差数列{an}中若a6+a8+a10＝72则2a10﹣a12的值为
Oncetherewasaverybrilliantcreativeandlearnedman.Hegainedmuch1whiletravelingthroughouttheworld.Unfortunatelyhelosthislegsandleftarminatrafficaccidentleavingonlyafingerandthumbonhisrighthand.Hebecameso2thathewasafraidhewouldspendhislife3andwouldnolongerbeabletousehislifeinan4way. Onedayherememberedhowhehadalwayslovedgetting5.Herealizedthathestillhadpartial6ofhisrighthandandcouldwritewith7.Thenhehadanidea.Whynotwritetootherpeoplewhoneedencouragement? He8wherehecouldfindthosewhocouldbeencouragediftheyreadhisletters.Hethoughtofpeoplein9.Manyofthemhadhopeofregainingtheir10.Otherswouldkeepfeelingdepressedandremainputawayfortherestoftheirlives.Hedecidedthathemusttryto11them.Sohewrotetoaprisonministryaboutsendingletterstotheprisoners.Theprisonministerrepliedthatwritingtotheprisonerswouldbe12.Howeveritwouldbeagainstprisonrulesfortheprisonerstowriteback. 13withtheintentionthemanbegansending14messagesofGod'slovehopestrengthandencouragement.Hewrotetwiceaweektestinghisstrengthandabilitytothe15.Hepouredhisheartandsoulintohiswords16hisexperiencesenseofhumoroptimismandfaith. Itwasdifficulttowritethoselettersespeciallywithouthopeofany17.Frequentlyhefeltdiscouragedwonderingifanyone18readhisletters.Howeverthiswashis19chancesohedeterminedtocontinue. AtlasthereceivedaletterfromtheprisonofficerwhichsaidPleasewriteonthebestpaperyoucanafford.Yourlettersarepassedfromcell牢房tocelluntiltheyalmostfallto20! Weallhaveuniqueexperiencesabilitiesandtalents.Wecandiscoverwaystoreachothersinneedofencouragementandstrength. 1A.wealth B.faith C.confidence D.experience 2A.depressed B.embarrassed C.ashamed D.thrilled 3A.writing B.suffering C.weeping D.wandering 4A.abnormal B.regular C.comfortable D.meaningful 5A.letters B.e﹣mails C.presents D.prizes 6A.sense B.strength C.shape D.function 7A.affection B.caution C.difficulty D.confidence 8A.estimated B.doubted C.assumed D.wondered 9A.hospitals B.prisons C.churches D.charities 10A.families B.letters C.freedom D.conscience 11A.release B.reach C.defend D.know 12A.acceptable B.reasonable C.forbidden D.considered 13A.Faced B.Satisfied C.Filled D.Impressed 14A.holy B.daily C.one﹣way D.round﹣way 15A.point B.worst C.degree D.limit 16A.sharing B.learning C.gaining D.enriching 17A.success B.reply C.help D.progress 18A.curiously B.patiently C.carefully D.actually 19A.only B.better C.extra D.lost 20A.ruin B.theground C.pieces D.thebottom
ThefatheraswellashisthreesonsskatingonthefrozenrivereverySundayafternooninwinter. A.isgoing B.go C.goes D.aregoing
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