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(5分)已知向量=(1,﹣2),=(x,6),且∥,则x= .
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高一下学期数学《》真题及答案
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已知平面α和平面β的法向量分别为a=112b=x-23且α⊥β则x=.
已知直线l1的方向向量a=13直线l2的方向向量为b=-1k若直线l2过点05且l1⊥l2则直线l2
x+3y-5=0
x+3y-15=0
x-3y+5=0
x-3y+15=0
已知三阶矩阵A与三维向量x使得向量组xAxA2x线性无关且满足A3x=3Ax-2A2x记P=xAxA
已知向量=42=x3向量且则x=
1
5
6
9
已知向量=sinπ﹣ωxcosωx=11且fx=•的最小正周期为πⅠ求ω的值Ⅱ若解方程fx=1Ⅲ在△
已知直线l1的方向向量是a=24x直线l2的方向向量是b=2y2若|a|=6且a·b=0则x+y的值
-3或1
3或-1
-3
1
已知向量=1x-2=21x且⊥则x的值为____
-1
0
1
2
已知三阶矩阵A与三维向量x使得向量组xAxA2x线性无关且满足A3x=3Ax-2A2xⅠ记P=xAx
已知3阶矩阵A与三维向量x使得向量组xAxA2x线性无关且满足A3x=3Ax-2A2x. 1记P=
已知向量向量且则实数x等于
0
4
-1
-4
本小题满分12分已知向量a=21b=xy.1若x∈{-1012}y∈{-101}求向量a∥b的概率2
已知向量a=1-2b=x4且a∥b则|a+b|的值是.
已知向量m=sinAcosAn=1-2且m·n=01求tanA的值2求函数fx=cos2x+tanA
已知平面α和平面β的法向量分别为a=112b=x-23且α⊥β则x=________.
已知向量a=sinxcosxb=1-2且a∥b那么tanx=.
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四氢噻是家用天然气中人工添加的气味添加剂具有相当程度的臭味.下列关于该化合物的说法正确的是
氮是极其重要的化学元素.我国科学家最近成功合成了超高含能材料聚合氮和金属氮.基于氮气的能源研究也是未来能源发展的重要方向. 1基态氮原子的价电子排布式为. 214g氮气分子中原子轨道以“头碰头”方式形成的共价键数目为以“肩并肩”方式形成的共价键数目为. 3CNO三种元素按第一电离能从大到小的排列顺序为.已知氧的第一电离能为1369kJ•mol﹣1第二电离能为3512kJ•mol﹣1第三电离能为5495kJ•mol﹣1其第二电离能增幅较大的原因是. 4某含氨配合物CrCl3•6NH3的化学键类型有配位键极性共价键和.CrCl3•6NH3有三种异构体分别是[CrNH36]Cl3[CrNH4Cl2]Cl•2NH3. 5NH4N3是在的高能量度材料其品胞构如图所示.N3﹣是直线型结构N3﹣中氮原子的杂化类型是.NH4+的VSEPR模型名称为. 6已知NH4N3的晶胞参数为anm和0.5anm阿伏加德罗常数的值为NA则NH4N3的密度是g•cm﹣3.
XYZW为短周期元素X的M电子层有1个电子Y的最外层电子数为内层电子数的2倍Z的最高化合价为最低化合价绝对值的3倍Z与W同周期W的原子半径小于Z.下列叙述正确的是
Goodnewsforawkwardteenagersaroundtheworld.Astimegoesbyyoucould41uplikeacompletelydifferentperson. Thiscomesfromthelongestrunningpersonalitystudyever42byscientist.AccordingtoresearchersfromtheUniversityofEdinburghintheUKourpersonalitychangessomuchfromyouthtooldagethatmostpeople'spersonalitiesinolderagearebarely43comparedtotheiryoungerselves. Theresearchersanalyzedresultsfromastudyin1947whichgathered1208teenagersinScotlandaged14andaskedtheirteachersto44theirpersonalitiesbasedonsixtraits特征. NowmorethansixdecadeslatertheUniversityofEdinburghteamhasmanagedtocontact635ofthe44studentsand174agreedtohavetheirpersonalitiestestedoncemore. Atanaverageageof76.7yearsoldthegroupwereaskedto46themselvesonthesamesixpersonalitytraitsthenpickaclosefriendorfamilymembertodothesame. By47thethen﹣and﹣nowtestresultstheresearchersfoundthatthereishardlyanyrelationshipbetweentraitspeoplehadasteenagersandthoseintheirolderyears. Itwasasifthesecondtestshadbeengivento48peoplethestudy'sresearcherswroteintheirreportwhichwaspublishedinjournalPsychologyandAging. Theresultswereasurprisebecauseresearchinthepastfoundpersonality49inpeopletestedfromchildhoodtomiddle﹣ageandfrommiddle﹣agetoolderage. Astheteamexplainedourpersonalityappearsstableovershortintervals﹣﹣50sothroughoutadulthood.51thelongertheintervalbetweentwotestsofpersonalitythe52therelationshipbetweenthetwotendstobe. It'sclearthatmorestudiesareneededtofindoutwhat'sgoingonhere.Butitcouldbethefirst53thatit'snotjustourcellsthatarebeing54throughoutlife﹣thewaywethinkfeelandbehavemightnobeas55asweoncethought. 41.A.hold B.wake C.end D.cheer 42.A.carriedout B.appliedto C.participatedin D.madeup 43.A.incredible B.accessible C.changeable D.recognizable 44.A.assemble B.assess C.assume D.access 45.A.alternative B.individual C.original D.separate 46.A.score B.rate C.comment D.remark 47.A.comparing B.reviewing C.presenting D.observing 48.A.young B.similar C.amateur D.different 49.A.combination B.stability C.transformation D.flexibility 50.A.increasingly B.strangely C.subsequently D.obviously 51.A.Therefore B.Moreover C.However D.Otherwise 52.A.stronger B.closer C.further D.weaker 53.A.option B.sign C.symptom D.cause 54.A.replaced B.exposed C.divided D.cultivated 55.A.stuckinmud B.buriedinsand C.lostinthought D.setinstone
金属铼熔点高耐磨耐腐蚀广泛用于航天航空等领域.工业上用富铼渣含ReS2制得铼粉其工艺流程如下图所示 回答下列问题 1图1是矿样粒度与浸出率关系图浸出时应将富铼渣粉碎至目请给出提高铼浸出率的另外两种方法.浸出反应中ReS2转化为两种强酸请写出铼浸出反应的离子方程式. 2图2表示萃取液流速与铼吸附率关系.结合实际工业生产效益萃取剂流速宜选用的范围是BV/h. 3已知高铼酸铵不溶于冷水易溶于热水.提纯粗高铼酸铵固体的方法是. 4高铼酸铵热分解得到Re2O7写出氢气在800℃时还原Re2O7制得铼粉的化学方程式. 5整个工艺流程中可循环利用的物质有H2SO4.
中国古代文献中记载了大量古代化学的研究成果本草纲目中记载“火药乃焰消KNO3硫磺杉木炭所合以为烽燧铳机诸药者”反应原理为S+2KNO3+3C═K2S+N2↑+3CO2↑. 1氮原子的价层电子排布图为烟花燃放过程中钾元素中的电子跃迁的方式是KSNO四种元素第一电离能由大到小的顺序为.上述反应涉及的元素中电负性最大的是填元素符号. 2碳元素除可形成常见的氧化物COCO2外还可形成C2O3结构式为.C2O3与水反应可生成草酸HOOC﹣COOH. ①C2O3中碳原子的杂化轨道类型为CO2分子的立体构型为. ②草酸与正丁酸CH3CH2CH2COOH的相对分子质量相差2二者的熔点分别为101℃﹣7.9℃导致这种差异的最主要原因可能是. ③CO分子中π键与σ键个数比为. 3超氧化钾的晶胞结构图如下 则与K+等距离且最近的K+个数为若晶胞参数为dpn则该超氧化物的密度为g•cm﹣3用含dNA的代数式表示设NA表示阿伏加德罗常数的值.
下列四套装置用于实验室制二氧化硫并回收硫酸铜的实验其中不能达到实验目的是
图1和图2分别为二元酸H2A和乙二胺H2NCH2CH2NH2溶液中各微粒的百分含量δ即物质的量百分数随溶液pH的变化曲线25℃.下列有关说法正确的是 已知H2NCH2CH2NH2+H2O⇌[H3NCH2CH2NH2]++OH﹣
SpringfestivalisthemostimportantholidayforChinesepeople.36Thearrangementstheyhavetomakeforfamilyreunionsbuyingnecessitiesandpreparingfoodkeepthembusythroughouttheholiday.Withthecountry'seconomicdevelopmentandglobalizationasitiscelebratedtodaySpringFestivalhasundergonemanychanges. 37PeoplecouldnotgetgoodfoodtheydesiredinearliertimesbutthreedecadesofeconomicgrowthhasensuredthatmostpeopleinChinacanenjoygoodmealswhenevertheywantto.Somepeoplesufferfromobesityandotherhealthproblemsassociatedwithextremeeating. InthepastSpringFestivalcelebrationswerelimitedtoeventssuchassongsanddancesdragonorliondancesorfireworks.38Buteconomicdevelopmentandurbanization城市化seemstohaveweakenedthesociallinksamongpeople.Manyespeciallythoselivingincitiesarenotinterestedincelebratingthefestivalwithpeopletheyhardlyknow. 39Inthepastpeopleusedtovisitrelativesandfriendswithgiftsandlotsofgoodwishes.TodaymanypeopleespeciallytheyouthusetheircellphonesortheInternettosendtheirgoodwishesandevengifts.Somemaysaythisissignthatpeoplehavebecomelesscaringabouttheirnearanddearonesbutweshouldseethisdevelopmentasatime﹣andenergy﹣savingexercisebroughtbytheinformationage. AlsowecanseesomepeoplehavestartedprayingtoGodortheBuddhaforacareerpromotionormorechancesinsteadofforalonglifeorafortuneoftheirfamily.Howeverthenumberofsuchpeopleisdecreasingnow.40 A.Theyrequirethejointeffortsoftheentirecommunity. B.Butsomethinglikethatdoesnotapplytosocietytoday. C.YetnoSpringFestivaliscompletewithoutfood. D.ManySpringFestivalcustomshavechangedtoo. E.ItisthebusiesttimeoftheyearforChinesepeople. F.Manyofthemtravelbackhomeandmeetfriends. G.Thatshowspeoplearebecomingmorereasonable.
某同学欲利用图装置制取能较长时间存在的FeOH2其中实验所用溶液现配现用且蒸馏水先加热煮沸.下列分析正确的是
A.Whensomethingcomesfromwithinyouyoualwaystryyourbesttoanalyzeitinascientificway. B.Psychologistscallthisprivatespeech﹣﹣﹣﹣languagethatisspokenloudbutdirectedatyourself C.Sowordstotheselfspokensilentlyorloudaresomuchmorethanjustchatter D.Wekeeptheprivatespeechweuseaschildreninside﹣﹣﹣﹣﹣﹣butwenevertrulyputawaytheout=loudversion. E.Accordingtohewell﹣knownsayingtalkingtoyourselfisthefirstsignofmadness. F.Self﹣talkisefficientbecausewhenwearevocalaboutourthoughtsitmakesalargerimpactonourbrain. Self﹣talkhelpsusall Talkingtoyourselfmayseemalittleshameful.Ifyou'veeverbeenoverheardcriticizingyourselfforafoolishmistakeorpracticingaspeechyou'llknowthesocialproblemsitcancause.67 Butthere'snoneedforembarrassment.Talkingtoourselveswhetheroutloudorsilentlyinourheadsisvaluable.Farfrombeingasignofinsanityself﹣talkallowsustoplanwhatwearegoingtodomanageouractivitiesandcontrolouremotions. Forexampletakeatriptoanypreschoolandwatchasmallgirlplayingwithhertoys.Youareverylikelytohearhertalkingtoherselfofferingherselfdirectionsandtalkingaboutherproblems.68Wedoalotofitwhenweareyoung. AschildrenaccordingtotheRussianPsychologistLevVygotskyweuseprivatespeechtocontrolouractionsinthesamewaythatweusepublicspeechtocontrolthebehaviorofothers.Aswegrowolderwekeepthissysteminside. Psychologicalexperimentshaveshownthatthisso﹣calledinnerspeechcanimproveourperformanceintasksliketellingwhatotherpeoplearethinking.Ourwordsgiveusaninterestingviewofouractions.Onerecentstudysuggestedthatself﹣talkismosteffectivewhenwetalktoourselvesinthesecondpersonasyouratherthanI69Ifyouwantproofturntoasportschannel.You'resuretoseeanathleteshoutingathimselforherself. Talkingtoourselvesseemstobeaverygoodwayofsolvingproblemsandworkingthroughideas.Hearingdifferentpointsofviewmeansourthoughtscanendupindifferentplacejustlikearegulardialogueandmightturnouttobeoneofthekeystohumancreativity. Bothkindsofself﹣talk﹣﹣﹣﹣﹣silentandoutloud﹣﹣﹣﹣seemtobringmanydifferentbenefitstoourthinking.70﹣
第一节完形填空 My14﹣year﹣oldsonJohnandIspottedthecoatatthesametimeatasecond﹣handclothingstore.IthadablackcollardelightfultailoringaFifthAvenuelabel标签andaan41priceof$28. Welookedat42sayingnothing43John'seyesshone.Darkwoolentopcoatswerepopularjustthenwith44butcould45severalhundreddollarsnow. John46thecoat.Heturnedfromsidetosideeyeinghimselfinthemirrorwithaseriousstudied47thatsoonchangedintoasmile.The48wasperfect.Johnworethecoattoschoolthenextdayandcamehome49abigsmile.Howdidthekidslikeyourcoat?Iasked.Theyloveit.Hesaid50foldingitoverthechairandsmoothingitflat. Overthenextfewweeksthe51cameoverJohn.Quietreasoneddiscussionwas52argument.Hebecamemorethoughtfulandeagerto53.GooddinnerMumhewouldsayeveryevening.OncedaywhenIsuggestedthathemightstartonhomeworkbeforedinnerJohnsaidYouare54andIguessIwill. WhenIaskedoneofhisteachers55causedthechangesshesaidwithlaughterItmustbehiscoat!atthelibrarywe56tomeetafriendwhohadnotseenourchildrenforalongtime.57thisbeJohn?heaskedlookinguptoJohn'snewheightassessingthecutofhiscoatandextendinghishandone58toanother. JohnandIbothknewweshouldnever59aperson'sclothesfortherealpersonwithinthem.Asisknowwhatisontheinsideshouldbe60withwhatisontheoutside. 41.A.unbelievable B.special C.reasonable D.average 42.A.theother B.others C.oneanother D.eachother 43.A.therefore B.however C.thus D.but 44.A.teenagers B.people C.parents D.adults 45.A.spend B.cost C.pay D.take 46.A.touched B.held C.buttoned D.obtained 47.A.gesture B.expression C.attitude D.feeling 48.A.color B.fit C.price D.style 49.A.having B.showing C.behaving D.wearing 50.A.carefully B.carelessly C.patiently D.hurriedly 51.A.change B.satisfaction C.happiness D.generosity 52.A.becauseof B.awareof C.insteadof D.apologize 53.A.regret B.please C.complain D.apologize 54.A.troublesome B.true C.right D.wrong 55.A.what B.how C.when D.that 56.A.decided B.came C.intended D.happened 57.A.Could B.Would C.Must D.Should 58.A.friend B.teacher C.gentleman D.fellow 59.A.watch B.mistake C.consider D.judge 60.A.compared B.connected C.combined D.matched
假如你是李华你校全体师生近期将举行一次远足活动请你给外教Tim写一封邮件邀请他一起参加.内容要点如下表注意1.词数100左右2.可适当增加细节以使行文连贯.3.邮件的开头和结尾已给出不计入总词数.DearTimWewouldfeelmuchhonoredifyoucouldmakeit.SincerelyyoursLiHua.
向体积均为100mL浓度均为1molL的NaClONaOHCH3COONa的三种溶液中通入CO2测得各溶液中nHCO3﹣的变化如图下列分析正确的是
Acryingbabycan'tbeignoredatall61anyonecanproveit.Researchershavefoundin62theyexperimentthatababy'scriescancauseuniqueemotionalresponsesinthebrain63makeitimpossibleforustoignorethem64weareparentsornot.Othertypesofcryincludingcallsofanimalsingreatpainfail65getthesameresponse﹣suggestingthatthebrain66programtorespondespeciallytobaby'scry.Theparticularlystrongresponsetoitwasseeninbothmenandwomen﹣eveniftheyhadnochildren. ResearcherDr.ChristinsaidThereis67specializedprocessinmenandwomen.Thestudywasinpeoplewhowerenotparentsyettheywereallrespondingat100meterstotheseparticular68sound.FellowresearcherKatieYoungsaiditmaytakealittle69longforsomeonetorecognizetheirownchild'scriesbecausetheyneedtodomoreanalyses.Theteamhad70previousfoundthatourreactionsspeedupwhenwehearababycrying.
下列玻璃仪器的洗涤方法涉及氧化还原反应的是
AfricanSafari EssentialinformationyouneedtoknowbeforebookingyourAfricanSafariinSouthernAfrica﹣Thesetipswillenhancetheexperiencethatyouhave ThingstoConsiderBeforeBookinganAfricanSafari 1BookinAdvance AfricanSafarisarenowhugelypopularandgoodsafaricampsoftengetbookedoutmorethanayearinadvanceespeciallyduringthehighseasonfromJulythroughtoOctober.Showmore… 2Choosingwhichgamepark Differentparkshavedifferenttopographyandweatherpatterns﹣thisgreatlyaffectsanimalmovementsatdifferenttimesoftheyear.Ifyouwanttotargetcertainspeciesofanimalsthensomeparksarebetterthanothersforcertainspecies.Showmore… 3Choosingwhichlodgeorsafaricamp Atypicalsafaricamphasbetween10and20bedsitisanintimatesafariexperienceandverypersonalized.Howevertherearealsohotelsinsomeplaceseitherinsideorjustoutsideanationalparkwhichcansleepanythingupto300people.Showmore… 4Guiding ThequalityexperienceandknowledgeofthegameatanySafaricampisalmostthemostimportantfactortoconsider.Goodguidescantransformyourexperiencefromordinarytoexceptional.Showmore… 5What'stheBestTimeofYeartogoonSafari Understandablyastheseasonschangesodoesthesafariexperience.Itishighlyadvisabletofindoutthebesttimeofyearforthesafariareathatyouareintendingtovisit.Priceswillchangedramaticallybetweenthehighandthelowseasonsogooddealsaretobehadinthelowseasonbutitisimportanttoknowthedifferenceasyourexperiencewillbevastlydifferent.Showmore… 6ThePrice Goingonsafariisnotcheapwhicheverwayyoudoitbutthepricerangecanbeenormous.UnfortunatelysafarisinmostcasesareacaseofyoupayforwhatyougetShowmore… 7Fly﹣insafariornot Usingsmallcharterplanesissometimesanabsolutenecessityforcampsinremoteareaswhereroadtransfersarejustnotpracticalorviable.Theseflightscanincreasetheoverallcostofthesafarisubstantiallybutgenerallytheyarewothitandallowyoutheflexibilitytovisitavarietyofsafaricampsindifferentlocations.Showmore… 8UseanAgent Asyoucanseefromalltheinformationandoptionsdetailedabovethereisgreatdealtounderstandandunlessyougoonsafariseveraltimesayearitisimpossibletoknowallthisstuff.Showmore… CONTACTUSNOWTOHELPPLANYOURSAFARI Wearequalifiedtravelagentswhoknowthisareaintimately! Clickonthebelowbuttonsforsomefantasticsafariideas 60.WhichisadeterminingfactorinchoosingaSafaricamp? A.Meansoftransport. B.Accommodation. C.Weatherpatterns. D.Gameguides. 61.JohnisplanningtohaveanAfricanSafariinAugust2018.Heshouldbookitin. A.July2018 B.January2018 C.July2017 D.October2017 62.WhichofthefollowingisFALSEaboutAfricanSafari? A.Youcanhaveagoodpricebutsameexperienceifyoutravelinlowseason. B.Ifyouvisitdifferentcampsinremoteareasflightsmaybeunavoidable. C.Themoremoneyyoupaythebetterexperienceyou'llget. D.Notalltheparkshavethesamespeciesofanimals.
第一节短文改错 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. NowIwanttotellyousomethingwhathappenedlastweekend.OnmywaytothecinemaInoticedaforeignertalktoapolicemenwhoseemedabletounderstandwhattheforeignerwassaying.Theytwolookedveryworriedly.SoIwentuptoseewhatIcoulddohelpthem.Itoldthepolicemantheforeignerhadlosthiswalletorcamera.Finallytheforeignergotbackhisbelongingwiththehelpofthepoliceman.Allofthemthankedme.BythetimeIarrivedatthecinemathefilmhavebeenover.AlthoughI'dmissedthefilmbutIwasveryhappybecauseIhadhelpedotherswithmyefforts.
Iwasstandinginthecheckoutlinebehindawomanwholookedtobein2160s.Whenitwasherturntopaythecashiergreetedherbynameandaskedherhowshewasdoing. Thewomanlookeddown22shakeherheadandsaidNotsogood.Myhusbandjustlosthisjobandmysonisuptohisoldtricksagain.ThetruthisIdon'tknowhowI'mgoingtogetthroughtheholidays. Thenshegavethecashierfoodstamps. Myheartached.Iwantedtohelpbutdidn'tknowhow.23Ioffertopayforhergroceriesoraskforherhusband'sresume? AsIwalkedintotheparkinglotIsawthewomen24returnhershoppingcart.Irememberedsomethinginmypurse25Ithoughtcouldhelpher.Itwasn'tahandfulofcashoranofferofajobforherhusbandbutmaybeitwouldmakeherlifebetter. MyheartpoundedasIapproachedthewoman. ExcusemeIsaidmyvoicetremblingabit.Icouldn'thelpoverhearingwhatyousaidtothecashier.Itsoundslikeyou'regoingthroughareallyhardtimerightnow.I'msosorry.I'dliketogiveyousomething. Ihandedherthesmallcardfrommypurse. Whenthewomanreadthecard'sonlytwowordsshebegantocry.AndthroughhertearsshesaidYouhavenoidea26thismeanstome. Iwasalittlestartledbyherreply.27notdoanythinglikethisbeforeIdidn'tknowwhatkindofreactionImightreceive.Allleftforme28saywasOh.WoulditbeOKtogiveyouahug? 29weembracedIwalkedbacktomycar﹣﹣andbegantocrytoo. Thewordsonthecard? YouMatter. Afewweeksearlieracolleaguegavemeasimilarcard30encouragementforaprojectIwasworkingon.WhenIreadthecardIfeltawarmglowspreadinsideofme.DeeplytouchedIcamehomeandorderedmyownboxofYouMattercardandstartedsharingthem.
Forgetaboutthepost﹣1995generation.Youngpeoplebornin1995orlaterhaveanothernameinEnglish﹣GenerationZ. NowenteringadulthoodandsoontojointheworkforceGenerationZgrewupinaspecialperiodoftime﹣atimeinwhichtechnologydevelopedfastsocialchangeshappenedeverydaytheinternetbecameuniversalandsadlysodidglobalterrorism. ItisbelievedthatGenerationZisthegenerationthatisgoingtoshapeourfuturewhichiswhypolicymakerssociologistsandcompanyleadersaretryingtheirbesttounderstandtheseyoungpeople. SowhatareGenZ﹣ersreallylike? MostpeopleagreethatthesinglebiggestdifferencebetweenGenZandothergenerationsishowconnectedtheyare.Thisisagroupofpeoplewhohavebeenfamiliarwithsocialmediaassoonastheywereborn.SocialmediahaschangedthewayGenZ﹣erscommunicatewitheachotherandhowtheygetandunderstandinformation. Wearethefirsttruedigitalnatives.IcanalmostcreateadocumentedititpostaphotoonInstagramandtalkonthephoneallatthesametimesaidHannahPaynean18﹣year﹣oldstudentatUCLAaccordingtoTheNewYorkTimes.GenerationZtakesininformationveryfastandlosesinterestjustasfast. ItmaybetruethatGenerationZ﹣ershaveashorterattentionspan注意力持续时间thanagoldfishbutsicetheygrewupamongsocialchangestheyaremoreactiveinpolitics.AccordingtotheBritishElectionStudy58percentof18﹣t0﹣24﹣year﹣oldvotedinthe2015generalelectionintheUKabigjumpfrom38percentin2005. GenerationZ﹣ersarealsoculturecreators.Growingupwiththeinternethasfreedthisgenerationfromtraditionalculturalexpression.WroteGraceMasbackaHuffingtonPostbloggerandaGenZ﹣erherself.AccordingtoMasbacktheseyoungpeoplearenolongerwillingtolettheircreativity.AccordingtoMasbacktheseyoungpeoplearenolongerwillingtolettheircreativitybelimitedbytheirparentsoftraditionalrules.TheywatchvideosandreadnewsonlineinsteadofonTVandtheysharetheirexperiencesonsocialmedia. WedecidewhatkindofcontentwewanttoexperienceandchoosehowweexperienceitwroteMasback. 33.WhichisTRUEaboutGenZ﹣ersaccordingtothearticle? A.Face﹣to﹣facecommunicationischallengingforthem B.Oftendoingmanythingsatthesametimeaffectstheirefficiency C.Theydon'tbothertothinkabouttheinformationtheyatcarefully D.Theyshowmoreinterestinpoliticsthaninotherfields 34.Whatcanweinferfromthelasttwoparagraphs? A.GenZ﹣ersenjoygreatfreedomtoexpressthemselves B.GenZ﹣ersenjoyteachingtheirparentsaboutnewculturaltrends C.GenZ﹣ersareagainsttraditionalculture D.GenZ﹣ersareunwillingtoobeytheirparents 35.Whichwordcanbestdescribetheauthor'sattitudetowardsGenerationZ? A.Worried B.Critical C.Appreciative D.Neutral中立的
决定物质性质的重要因素是物质结构.请回答下列问题 1已知元素M是组成物质Ca5PO43F的一种元素.元素M的气态原子逐个失去第1个至第5个电子所需能量即电离能用符号I1至I5表示如表所示 元素M化合态常见化合价是价其基态原子电子排布式为. 2往硫酸铜溶液中加入过量氨水可形成[CuNH34]SO4溶液该溶液可用于溶解纤维素. ①[CuNH34]SO4中阴离子的立体构型是. ②除硫元素外[CuNH34]SO4中所含元素的电负性由小到大的顺序为. ③NF3与NH3的空间构型相同中心原子的轨道杂化类型均为.但NF3不易与Cu2+形成化学键其原因是. 3一种Hg﹣Ba﹣Cu﹣O高温超导材料的晶胞长方体如图所示. ①该物质的化学式为. ②已知该晶胞中两个Ba2+的间距为cpm.则距离Ba2+最近的Hg+数目为个二者的最短距离为pm.列出计算式即可下同 ③设该物质的摩尔质量为M阿伏加德罗常数的值为NA则该晶体的密度为g•cm﹣3.
镍是制取各种高强度合金耐热材料的重要金属之一.以粗氧化镍主要含NiOCoOFe2O3等为原料制备纯镍的流程示意图如下 回答下列问题 1已知Cs+O2g=CO2g△H1=+393.5kJ•mol﹣1 COg++O2g=CO2g△H2=﹣283.0kJ•mol﹣1 反应a的化学方程式为既有利于提高反应a的速率又有利于提高原料CO2平衡转化率的措施是. 2用离子方程式表示碱洗过程发生的反应. 3镍的羰化反应为Nis+4COg⇌NiCO4g△H. ①一定温度下将一定量的粗镍和CO加入到1L的恒容密闭容器中反应3s后测得NiCO4的物质的量为0.6mol则0~3s内平均反应速率vCO=mol•L﹣1•s﹣1. ②镍的羰化反应平衡常数表达式为K=当温度升高时K减小则该反应的△H0填“>”或“<”或“=” 4羰化后的产物为FeCO5Co2CO8NiCO4有关性质如下 蒸馏提取NiCO4应选择的适宜温度范围是. 5采用230℃分解NiCO4g制取金属镍所获金属镍中常常含有碳原因是运用化学平衡移动原理解释.
Chinadroppeditsdecades﹣longone﹣childpolicylastyeartoalloweachfamilytohavetwochildren.Thischangehasput270millionmarriedwomenofchildbearingageinthepositionofchoosingbetweenfamilyandwork.Theemployersalsofacebigchallengesasmorefemaleworkerswillhavetwomaternityleaves产假foratotalofseventoeightmonths. InasurveypublishedbyclassifiedadvertisingwebsiteGanji.comcareerwomenwhomightbeconsideringhavingasecondchildwereaskedwhatkindsofpressuretheymightexpect.Morethan76percentofthewomenwhowerequestionedmentionedconcernsaboutthefinancialburdenofraisingtwochildrenwhilemorethan71percentsaiditwouldbedifficulttobalancecareerandfamily.Inadditionnearly56percentsaidthathavingasecondchildwoulddefinitelyhaveanegativeeffectontheircareer. AnothersurveyconductedbyChongqing﹣basedhumanresourceswebstiejob.cq.qq.comfoundthatover70percentofjobseekersbelievethathavingasecondchildwouldmakefemaleslesspopularinthejobmarketalthoughtwo﹣thirdsoftheemployerssaidthepolicywillmakenodifferenceintheiremploymentofstaff. FengLijuansseniorexpertonhumanresourcesat51job.comaleadingChinesejobfindingplatformsaidshewouldnotsaythereisprejudiceagainstcareerwomen.FengsaidChinesewomenshouldermorefamilyresponsibility.Itisnotonlyaboutmaternityleaveafemaleemployeemightonlyfullygetbacktoworkafterthreetofiveyeasafterhavingherfirstchild. WangYixinasenioremploymentadvisersaidthepositivesideisthatmorecompaniesaretryingtoattractmoretalentsbyprovidingsupporttocareerwomen.Differentfrombeforeitisnotonlyemployerschoosingemployees.Manytalentsincludingprofessionalcareerwomenalsochooseemployers.saidWang.Accordingtooursurveymanylargecompaniesareveryopentotheiremployees'choiceofhavingasecondchild. 28.Womenemployeestakelongertimetoconcentrateonworkafterchildbirthbecause. A.thereismoreprejudiceagainstcareerwomen B.theyhavelongermaternityleavestoenjoy C.theyshouldermorefamilyresponsibility C.havingasecondchildmakesthemlesspopular 29.Whatarewomenconcernedaboutwhenhavingtwochildreninthefirstsurvey? ①Financialburdenofraisingtwochildren ②Feweropportunitiestogetapayrise ③Negativeeffectsontheircareer ④Difficultyinbalancingcareerandfamily A.①②③ B.②③④ C.①②④ D.①③④ 30.Whichofthefollowingshowsthestructureofthewholetext? PParagraph 31.Whichisthebesttitleforthenext? A.DisadvantagesofRaisingTwoChildren B.ResponsibilitiesofCareerWomen C.EffectsofTwo﹣childofPolicyonWomen D.AttitudesofEmployerstoWomen.
氧化亚铜Cu2O是一种用途广泛的光电材料某工厂以硫化铜矿石含CuFeS2Cu2S等为原料制取Cu2O的工艺流程如下 常温下几种物质开始形成沉淀与完全沉淀时的pH如下表 1炉气中的有害气体成分是Cu2S与O2反应时氧化剂与还原剂的物质的量之比为. 2若试剂X是H2O2溶液写出相应反应的离子方程式.当试剂X是时更有利于降低生产成本. 3加入试剂Y调pH时pH的调控范围是. 4写出用N2H4制备Cu2O的化学方程式操作X包括洗涤烘干其中烘干时要隔绝空气其目的是. 5以铜与石墨作电极电解浓的强碱性溶液可制得纳米级Cu2O写出阳极上生成Cu2O的电极反应式.
以物质a为原料制备物质d金刚烷的合成路线如下图所示 关于以上有机物说法中错误的是
Cheaptraveldestinationsforwintertrips CharlestonBC.HotelCost72.33Round﹣TripFlight303ThecharmingcityofCharlestonisripeforexploringevenduringthecoolerwintermonths.CatchashowattheCharlestonStageCompanyorwatchaperformancefromtheCharlestonBallet.Ifit'syourfirsttimevisitingtakeacarriagetourofthecitytoexplore25to30blocksofthedowntownarea. AnchorageAlaskaHotelCost43.67Round﹣TripFlight577.50WalkonaglacierseewildlifeandexploreattractivenationalparksforcheapinAnchorage.TheChugachMountainsareeasilyaccessiblejust20minutesfromthedowntownarea. WashingtonDC.HotelCost150Round﹣TripFlight206.50TakeatriptotheLincolnMemorialexpressrespectandadmirationtothesoldiersthatservedinWorldWarIIattheNationalWorldWarIIMemorialanddiscoverothersitesthatHonorAmericanhistory﹣﹣﹣freeofcharge.Galleriesmuseumsandhistoricneighborhoodsareripeforexploringevenduringthewintermonths. SavannahGa.HotelCost49Round﹣TripFlight317.50Takingaself﹣guidedtourofthissoutherncityisoneofthebestwaystoseefamouslandmarksandsitesfreeofcharge.Visitthe22publicsquaresandseetheGeneralCasimirPulaskimonument.Anddon'tforgettogetyourpicturetakenatthesamebusstopbenchusedinthemovieForrestGumpinChippewaSquare. 21.WhichplacewillyouchoosetogoifyouareinterestedinmodernAmericanhistory? A.SavannahGa B.CharlestonBC C.AnchorageAlaska D.WashingtonDC 22.WhatcanwelearnabouttravelinginSavannah? A.Travelerscanoftenseewildlifeintheparks B.Travelerscanwatchaperformanceofballet C.Travelershavetotakeaself﹣guidedtourtotravel D.Traveleroftentakepicturesatthebusstopbench 23.ThepassageisNOTprobablytakenfroma. A.newspaper B.novel C.web﹣page D.magazine.
设NA为阿伏加德罗常数的值下列说法正确的是
下列有关物质的性质与用途说法正确的是
化学与生活环境密切相关下列说法错误的是
常温下用0.10mol•L﹣1的NaOH溶液滴定20.00mL浓度为0.10mol•L﹣1的HX溶液所得滴定曲线如下图忽略溶液体积变化.下列说法正确的是
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