首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
根据所给数列前五项的规律，判断数列1，，，，3…，3共有（ ）个项
查看本题答案
包含此试题的试卷
高二上学期数学《》真题及答案
点击查看
你可能感兴趣的试题
在等比数列中若则该数列前五项的积为
±3
3
±1
1
已知等差数列{an}前三项的和为－3前三项的积为8.1求等差数列{an}的通项公式2若a2a3a1成
一个等比数列的前3项的积为2后三项的积为4且所有项的积为64则该数列共有
6项
8项
10项
12项
有一数列的首项既不是0也不是1而是由下列规则决定位于首项后的每一项都等于1减去前一项的倒数以此类推.
已知数列{an}3572n+1另新作一数列{bn}使得b1=a1b2=a3当n≥2时bn=则数列{b
15
31
63
127
若数列{an}满足an＋1＝an＋an＋2n∈N*则称数列{an}为凸数列.1设数列{an}为凸数列
已知等差数列{an}前三项之和为－3前三项积为8.1求等差数列{an}的通项公式2若a2a3a1成等
本题共有3个小题第1小题满分4分第2小题满分6分第3小题满分6分 对于无穷数列{an}与{bn}记
阅读下列一段话并解决后面的问题.观察下面一列数12481632我们发现这一列数从第2项起每一项与它前
把12345这五个数字组成无重复数字的五位数并把它们按由小到大的顺序排列成一个数列1该数列共有多少项
数列的前项和为且1求数列的通项公式2若数列满足求数列的通项公式3令求数列的前项和.
每题给你一个数列但其中缺少一项要求你仔细观察数列的排列规律综合判断然后从四个供选择的选项中选出最恰当
2
1
4
3
已知等差数列{an}的首项a1＝1前五项之和S.5＝25则{an}的通项an＝________.
已知数列{an}的通项公式是an=4n2+3n+2n∈N.*则47是数列{an}的
第二项
第三项
第四项
第五项
已知数列{an}为等差数列a1=2且该数列的前10项和为65若正数列{bn}满足条件.1求数列{bn
设数列{an}的前n项和为Sna1=3且an+1=2Sn+3数列{bn}为等差数列且公差d>0b1+
等比数列共有偶数项且所有项之和是奇数项之和的3倍前3项之积等于27求这个等比数列的通项公式.
根据某20项的时间数列采用五项移动平均法进行修匀修匀后的时间数列有________项
根据某20项的时间数列采用五项移动平均法进行修匀修匀后的新的时间数列 有__项
设等比数列｛an｝共有3n项它的前2n项的和为100后2n项之和为200则该等比数列中间n项的和等于
热门试题
更多
Whatyouhavesaidareoldrulesandtheydon'tthestudentsnowadaysanymore. A.tumto B.applyto C.occurto D.agreeto
Reynoldshadjustturnedsevenandhaddevelopedherownuniqueidentityasatomboy.MostgirlsheragewantedtoplaywithBarbiedollswhileshepreferred1hairandjeans.Andshehopedtobecomeaprofessionaldirtbikerider.HermotherAlexandriawasabit2becausesheknewthatsomekidscouldbemeantostudentswithdifferentcharacteristics.ButsheandherhusbandgaveReynoldsadirtbikeasa3gift!They4herinterest. ForReynoldsschoolhadbecomeareal5especiallyaftershetoldeveryonethatshehadgotadirtbikeforherbirthday.Itdidn'ttakelongforsomeofher6tovoicetheiropinions.Astimewentonshewas7constantly. Reynolds'parentsraisedtheirkidstobe8andindependent.Theywere9thatReynoldscouldhandlethesituationonherown.Andthat'sexactlywhatshedid.Shesimply10allthenegativitybehindandkeptongoingaboutherday.But11herbreakingpointgrewcloser.Reynolds12tosetfootinschool.Alexandriadecidedto13upwithaplan. Alexandriaarrangedtohaveabikergroup14Reynoldstoschoolthatday.They15somepolicemen.Youcanimaginehow16Reynoldswastohermom.Theymadeatinyvestandhelmetforhertowear.Whenthegrouppulleduptotheschoolherclassmateswereamazed.Suddenlyeverything17.Herclassmateshadawholenew18forherincludingthemeankidswhohadlaughedather.Thisallowedherinnerhappinessto19. Reynolds20totheworldthatweshouldneverbeafraidtobewhoweareorallowotherstocontrolusthroughfear. 1A.long B.short C.beautiful D.soft 2A.excited B.annoyed C.worried D.ashamed 3A.Christmas B.NewYear C.graduation D.birthday 4A.encouraged B.developed C.reminded D.declared 5A.comfort B.challenge C.support D.dream 6A.neighbors B.friends C.teachers D.classmates 7A.envied B.cheated C.teased D.defeated 8A.generous B.cautious C.tough D.gentle 9A.proud B.confident C.satisfied D.surprised 10A.left B.followed C.turned D.pull 11A.luckily B.hopefully C.directly D.eventually 12A.decided B.begged C.agreed D.refused 13A.put B.come C.catch D.team 14A.welcome B.drive C.accompany D.push 15A.included B.accepted C.introduced D.employed 16A.regretful B.fearful C.grateful D.helpful 17A.changed B.happened C.came D.broke 18A.respect B.concern C.trust D.anger 19A.disappear B.fade C.hide D.return 20A.explained B.proved C.lied D.announced
AsofTuesdayChineseboxofficehitWolfWarrior2hasearnedmorethan3.4billionyuan﹩507million1breakChina'sall﹣timeboxofficerecordwhich2setlastyearbyHongKongcomedyTheMermaid. TheleadingcharacterisLengFengplayedbyWuJingthefilm'swriteranddirector.Lengisa3fearformerspecialforcessoldierofthePeople'sLiberationArmy.Duringamilitaryrebellion反叛in4AfricancountryLengalmostsingle﹣handedlyhelpsChineseworkersandAfricanlocalsescapethewar﹣tornnation.Butthefightingscenesalonedon'texplainthemovie's5succeed﹣﹣it'salsothepatriotism爱国主义andspiritofthefilmprojects6haveimpressedChineseaudiences. TongYemenga32﹣year﹣oldofficeworkerfromBeijingIfeltsoproudof7IcountrywhenIsawWuJingwavingthenationalflaginthewarzoneshesaid.Itshowedour8increasenationalpower. Themovie'spatrioticreactioncanbeattributedtoitstiming.WolfWarrior2hitcinemasasIndiaandChinawereinvolved9aborderdisputeasthecentralgovernmentispromotingitsinternationalBeltandRoadInitiative倡议10asthePeople'sLiberationArmycelebratedits90thanniversary.
Hewasdbythecompanybecauseofthehugelossduetohiscarelessness.
短周期元素XYZW的原子序数依次增大它们的原子最外层电子数为互不相等的奇数．X与Y位于不同周期X与W的最高化合价之和为8元素Z的单质是目前使用量最大的主族金属元素单质．下列说法中正确的是
WhenIwaseightIgotmyfirstpairofglasses.FarfrombeingmadefunofatschooltheonlystruggleIgotwasendlessrequeststotryonmynewglasses.HearingaboutwhathappenedatschoolmyfatheroncelookedatmeandaskedwhetherIhadpretendedtobetheblindnessjusttolooklikeHarryPotter? WithmystrangehairandglassesIdidnothingtoavoiditeither.TheHarryPotterbookswerethegreatpopculturaleventofmygenerationwhobeganreadingagain.MyschoollibrarianbothconfusedandannoyedbyusPotterfansdealtwithfightsovertheschoolsfewoldcopiesbysettinganewruleHarryPottercouldbeborrowedforonlythreedaysinsteadofthewholeweekofborrowingperiodeveryothertitlewasallowed. Inthe20yearssincethefirstbookarrivedonshelvespublishersandparentshavebeenaskingwhathasmadeJ.K.Rowling'sbookssoloved.Itisbettertolookattheinfluencetheyhavehadontheirreaders.Yesthebookswereaboutaboytakingonadarkandpowerfulenemyinthemagicalworldbuttheywerealsoaboutlovedefeatinghatedeterminationandchoosingbetweenwhatiseasyandwhatisright.Rowling'sentiremagicalcharacterswereallpeoplewewanttobe. IgrewupwithHarryandtogetherwebecamechildrenwithourownopinionsteenseasytogetangryandyoungadultsthinkingofeverythingasnormal.Whenthefinalbookcameoutin2007.Ireaditfor12hourswithoutabreakandcriedasIfinishedit.IfeltsomethingsadtheendofHarry'sstorysignaledtheendofmychildhood.Iwassuddenlyaimless.MeanwhilemynowPotter﹣madfatherwalkedimpatientlynearbywaitingforthepropermomenttotakethebookawayfromhisdaughter. HarryPotterdidshapemygeneration.AsagirlwhogrewupmostlyinpeacetimemanyoftheideasIfoundinthesebookswereoneswehadnevercomeacrossbefore.Themagicalworld'sterribletreatmentofnon﹣humanbeingswasthefirstdescriptionofslaveryIknew.ThetreatmentofHarry'steacherRemusLupinwhohideshisconditionatworkisametaphor比喻fortheshamesurroundingthosewhosufferfromAIDS.Andallsettingslikethismayhavereal﹣worldreflections.AstudyfoundthatteenageHarryPotterreadersshowedmoretolerance包容towardsthosewhoweresuffering.IsitpossiblethatJeremyCorbyn'spopularityamongtheyounghadanythingtodowiththeirliteraryeducation?IsitpossiblethatHarryPotterinthe20yearshehasbeenwithushasinspiredagenerationtobemoreempathetic感同身受welcomingandsociallyopen﹣mindedthanthosebeforeit?WewillseeIfnotatleastmyglassesarestillcool. 1Paragraph1isintendedtoshow. A.theauthorssufferingscausedbytheglasses B.theauthorscloserelationswithotherstudents C.themisunderstandingbetweentheauthorandherfather D.thepopularityofHarryPorteramongstudents 2HowdidtheschoollibrarianstopthefightsbetweenPotterfans? A.BypreventingPotterfansborrowingHarryPottermanytimes B.BysellingtheHarryPorterbooksinthelibrary. C.BycreatinganewruleforHarryPotter'sborrowingperiod. D.BybuyingmoreHarryPotterbooksforthelibrary. 3WhatcanwelearnabouttheHarryPotterbooksfromParagraph3? A.Thebookhasbeenthemostpopularoneamongallthebooksfortwentyyears. B.Itisthestoryofrevenge复仇inthemagicalworldthatmakesthebookpopular. C.Readersarecrazyaboutthebookbecauseithastaughtthemhowtoloveandmakewisechoices. D.Thebookhashadsuchgreatinfluenceonthereadersthattheyallwanttobemagicalpersons. 4WhydidtheauthorcrywhenshereadHarryPotterthatcameoutin2007? A.BecauseshesuddenlyfoundthatshewastoooldtoreadHarryPotter. B.Becauseherfatherwasforachancetotakeherbookaway. C.Becauseshehadnoplanforwhattodoafterherchildhoodended. D.Becauseshewastoosadtoknowthe2007bookwasthelastHarryPotterbook. 5TheunderlinedwordsignaledinParagraph4isclosestinmeaningto. A.described B.created C.changed D.marked 6What'sthelastparagraphmainlyabout? A.HarryPotterhasgreateffectsontheauthor'sgeneration. B.ThecharactersinHarryPorterwerecreatedthroughgreatimagination. C.ComparedwithotherpeopleHarryPotterreadersaremoretolerant. D.ReadingHarryPotterisimportantforchildrenlivinginpeacetime.
﹣﹣﹣Areyougoingtoaccepttheoffer? ﹣﹣﹣Youbet!Thesalaryisnotthatgoodbutyouknow. A.betterlatethannever B.actionsspeaklouderthanwords C.achangeofworkisasgoodasrest D.abirdinhandisworthtwointhebush
Whenyou'vefinishedreadingthebookdon'tforgettoputitbackontheshelf?A.doyou B.don'tyou C.willyou D.won'tyou
Thesteakintherestaurantwasterrible.HowIwishIrice! A.wouldorder B.ordered C.order D.hadordered
Alltheticketsfortheflighthavebeensoldout.Youcanonefortomorrow. A.save B.reserve C.arrange D.deserve
December25isthedaywesternerscelebrateastheirChristmasDay. A.when B.that C.as D.onwhich
Consideringherqualityandexperiencesheistheideal候选人forthepositionofgeneralmanager.
Theaveragemanfailsnotbecausehelacksabilitybutbecausehelackstheabilitytoconwhatheshoulddo.
Thereisnopoint使确信himofTina'shonestybecausehejustdoesn'tbelieveinanypersoninthecompany.
Manyofushavesomeoneinourlivesthathasabsolutelyeverything.Buyingagiftforthatspecialpersoncanprovequitestressful.Hereareafewpointsaimedatmakingthischallengealittlebiteasier. Buyingthathard﹣to﹣findgiftcanhaveyouwanderingthemallsforhoursonendwithlittleornoluck.Beforestartingsuchashoppingjourneythinkcarefullyaboutwhatthatpersonmightreallyenjoyinsteadofhopingtheperfectgiftwillmiraculously奇迹般地appear.ThinkaboutwhatishappeningintheirlivesatthemomentHavetheyrecentlyexperiencedamajorlifeevent.takenupanewhobbyorplannedatrip?Thinkabouthowyourgincancontributetoatheseevents. HaveyoueverfoundthatperfectChristmasgiftforsomeoneinJulybutdecidedtowaifandbuyitlater?Ifyouthinkit'sagoodgiftbuyitthen.Don'twaituntilthelastminutetobuythatperfectpresent.Chancesarethatyou'lleitherforgetwhatthatgiftwasoritwon'tbeavailablewhenyougotogetitlater.Last﹣minuteshoppingisratherstressfulandusuallydoesn'thavethedesiredresults. AnythingyoucanbuyataretailstorethesedayscanalsobeboughtontheInternet.Betterstillyoucanfindspecialgiftsthatyounormallycantfindatthemall.Searchforspecialgiftideasandyou'llbeamazedatthethingsthatyoumayneverhavethoughtofbefore.Forexamplefindoutwhattheirfavoritetoyorbookwaswhentheywereachildandseeifyoucanfinditforsaleonanauctionsite拍卖现场. Spendsometimewiththepersonandgetabetterideaoftheirinterests.Theymaymentionthatthey'veneededsomethingforthemomentbutjusthaven'tgotaroundtogettingit.Ormaybethey'velostorbrokensomethingthattheyreallymiss.Maybethey'restillusingsomethingfromthepastthatneedsupdating. Ifallelsefailstherearealwaysgiftcards.Ratherthanjustgivethegiftcardhoweverbealittlecreative.Makeagameoutofitsuchaswrappingthecardinaseriesoflargerboxessoittakesawhiletogettoitratherthanjusthavingthemopenanenvelope.Anotherchoiceistoincludeagiftcardwithsometheatretickets.
TomhasbeendreamingofbecomingabankerandIbelievehefinanceinuniversityattheageof20. A.willbestudying B.hadstudied C.hasstudied D.wouldstudy
Idon'tconsidermyselftobeavegetarianatleastnotinthestrictestsenseoftheterm.ThetworulesIfollowasasemi﹣vegetarianarethatInevercookmealsathomeusingmeatnordoIordermeatdisheswhendiningout.Obviouslythesearen'ttheonlyoccasionswhenIhavemeals.MyfriendssometimesthrowdinnerpartiesandIwouldn'twanttoforcemydietarybeliefsuponthem.SoIeatwhatevertheyprepare. I'mnotoffendedbythetasteofmeatatall.ActuallyIgrewupeatingmeat.AsanadulthoweverIbecamemoreconsciousofmyeatinghabits.IstartedtoeatlessandlessmeatuntilonedayIfoundthatIcouldgoformonthswithouteatinganymealscontainingmeatatall.Ibegantoexploretheideaofgivingupanimal﹣basedfoodsaltogetherjusttoseehowIwouldgeton. Soonenoughawholenewworldoffoodopeneduptome.Istartedeatingalotofvegetables.WhatIdiscoveredisthatmaintainingavegetariandietisnotonlyhealthydeliciousandinexpensiveit'salsoabundantinvariety. Evenwithallthehealthbenefitsofavegetariandiet﹣lowerriskofheartattackpreventionofhighbloodpressurereducedratesofcancer﹣therestillseemstobeacompletelackofvegetarianrestaurantsandashortageofvegetarianoptionsatmostrestaurants.Ibegantowonderifpeopleweresimplyaddictedtomeat.ThatmaybetrueforsomebutforotherswhomightgivevegetarianismatryIrealizedthattherewassomethingelseintheway﹣thecultureofvegetarianismappearedtobeunpleasant.Itseemsthattherearetoomanyvegetarianswhobelievethattheirwayofeatingissuperiortoanyother.Theyaren'tjustvegetariansthey'rebetterpeopleorsotheythink.Thisisratheroffensive. SoIproposethatwethevegetariansoftheworldshouldbecomemorerelaxedaboutourmeat﹣eatingfriends.Perhapsifvegetarianismisseentobeanattractiveoptionmorepeoplemighttryit.Isupposeforvegetarianismtotakerootinsocietyforalltoenjoyitneedstochangeitsimagetoonethatisfuninvitingandworthfollowing. 1Whydoestheauthoreatwhateverhisfriendsprepare? A.Hehasnochoice B.Thefoodisappealing C.Hewantstobeapoliteguest D.Itdoesn'tbreakanyofhisrules 2Howdidtheauthorgiveupmeat? A.Throughagradualprocess B.Throughthehelpofothervegetarians C.Bycookingvegetarianmealsathome D.Bysettinghimselfagoalofeatingnomeat 3Whatdoestheauthorthinkisthemainproblemwithvegetarians? A.Theyareaggressive B.Theyareprideful C.Theyareunsocial D.Theyarerude 4Thephrasetakerootinthelastparagraphreferstovegetarianismbecomingmore A.valuable B.fashionable C.exciting D.established
Peopleindevelopedcountriesareincreasinglysufferingfromillnessesresultingfromovereating.Whilestarvationandhungerarestillbigproblemsinmanypoorcountriesintheworldmorethan25percentofthepopulationinAmericaandotherwesterncountriesareobese.Thisdoesn'tjustmeanyouarealittlebitfat.Itmeansyouaremorethan20kilosoverweight. Dr.JohnColonfromOhioStateUniversitysaystheproblemisonlygoingtogetworse.Asmorewomenhavegoneouttoworkyoufindthatparentsingeneralhavelesstimetospendonpreparingfood.That'snotjustcookingbutalsoplanningwhattoeatdoingtheshoppingandbuyingthefreshfood.Familiesthereforeincreasinglyrelyonready﹣madeandfrozenmealswhichtendstobehighinfatandcontainalotofadditivesmaterialsaddedtofoodtoimproveitstasteandsugar.Theotherthingisthatparentsseemtofeelguiltyaboutnotspendingsomuchtimewiththeirkidssotheytendtogivemorequicklytochildren'sdemandsforthingslikesweetsandchocolate. BenBrown.whoisaBritishMemberofParliamentblamesthebigfoodcompanies.Hewantstobananyfoodadvertisingthatisaimedatchildren.Theproblemisthatthesecompaniesspendmillionsofpoundssellingfoodtochildren.It'sallcrisps薯片intheshapeofdinosaursandchocolateintheshapeofMickeyMouse.Imean36what'sgoingtobemorefuntoansight﹣year﹣old﹣﹣﹣anicecreamwithafreetoyoranapple? Onefoodcompanythinksithasananswertothisithasinventedcheese﹣flavoredcabbageandchocolate﹣flavoredcarrots.ItdevelopedtheWhackyVegwithmoneydonatedbyacancerresearchcharitywhichfoundthatadietcontaininglotsoffruitandvegetableshelpsreducecancer.Howevertoday'ssweet﹣toothedkidsneedtobebribed贿赂intoahealthydietandwillonlycattheirgreensiftheytastedifferent. 1TheunderlinedwordobeseinParagraph1probablymeans. A.Fit B.slim C.overweight D.unhealthy 2WhatcanweinferfromtheunderlinedsentenceinParagraph3? A.Foodcompaniesselltoomuchfoodtochildren. B.Foodadvertisingisresponsiblefortheovereatingproblemofchildren. C.Aneight﹣year﹣oldboyprefersanicecreamtoafreetoy. D.ChildrenlikecrispsintheshapeofdinosaursandchocolateintheshapeofMickeyMouse. 3Inordertosolvetheovereatingproblem. A.parentsshouldbribetheirchildren B.greenfoodshouldbeinventedforthechildren C.parentsshouldforcetheirchildrentoeatmorevegetablesandfruit D.foodcompaniesshouldinventhealthyfoodwithspecialtaste 4Whatdoesthepassageintendtotellus? A.Towarnusofthedangerofovereating. B.Totellusthatmostpeopleindevelopedcountriesareoverweight. C.Toshowusthatfoodcompaniesareresponsiblefortheovereatingproblem. D.Toreporttheovereatingproblemindevelopedcountriesanditspossiblecausesandsolutions.
设NA为阿伏加德罗常数的值．下列说法正确的是
Thereare广泛的concernsoverfoodsafetyinthecountry.
常温下向50mL溶有0.1molCl2的氯水中滴加2mol/L的NaOH溶液得到溶液pH随所加NaOH溶液体积的变化图象如下．下列说法正确的是
Failureisprobablythemostexhaustingexperienceapersoneverhas.Thereisnothingmoretiringthannotsucceeding. Weexperiencethistirednessintwowaysasstart﹣upfatigue疲惫andperformancefatigue.Inthe formercasewekeepputtingoffataskbecauseithaseithertooboringortoodifficult.Andthelongerwedelayitthemoretiredwefeel. Suchstart﹣upfatigueisveryrealevenifnotactuallyphysicalnotsomethinginourmusclesandbones.Thesolutionisobviousthoughperhapsnoteasytoapplyalwayshandlethemostdifficultjobfirst. YearsagoIwasaskedtowrite102essaysonthegreatideasofsomefamousauthors.ApplyingmyownruleIdeterminedtowritetheminalphabeticalorderneverlettingmyselfleaveoutatoughidea.AndIalwaysstartedtheday'sworkwiththedifficulttaskofessay﹣writing.Experienceprovedthattheruleworks. Performancefatigueismoredifficulttohandle.Thoughwillingtogetstartedwecannotseemtodothejobright.Itsdifficultiesappearsogreatthathoweverhardweworkwefailagainandagain.InsuchasituationIworkashardasIcan﹣thenlettheunconscioustakeover. WhenplanningEncyclopediaBritannicaIhadtocreateatableofcontentsbasedonthetopicsofitsarticles.NothinglikethishadeverbeendonebeforeanddayafterdayIkeptcomingupwithsolutionsbutnoneofthemworked.Myfatiguebecamealmostunbearable. OnedaymentallyexhaustedIwrotedownallthereasonswhythisproblemcouldnotbesolved.Itriedtoconvincemyselfthatthetroublewaswiththeproblemitselfnotwithme.RelievedIsatbackinaneasychairandfellasleep. AnhourlaterIwokeupsuddenlywiththesolutionclearlyinmind.Intheweeksthatfollowedthesolutionwhichhadcomeupinmyunconsciousmindprovedcorrectateverystep.ThoughIworkedashardasbeforeIfeltnofatigue.Successwasnowasexcitingasfailurehadbeendepressing. HumanbeingsIbelievemusttrytosucceed.Successthenmeansneverfeelingtired. 1Peoplewithstart﹣upfatiguearemostlikelyto. A.acceptfailure B.workhard C.seekhelp D.delaytasks 2Whatdoestheauthorrecommenddoingtopreventstart﹣upfatigue? A.Doingthingsinstrictorder. B.Buildingupphysicalstrength. C.Leavingoutthetoughestideas. D.Dealingwiththehardesttaskfirst. 3Onwhatoccasiondoesapersonprobablysufferfromperformancefatigue? A.Beforestartingadifficulttask. B.Whenallthesolutionsfail. C.Ifthejobisratherboring. D.Afterfindingawayout. 4Whatcouldbethebesttitleforthepassage? A.SuccessIsBuiltuponFailure B.HowtoHandlePerformanceFatigue C.GettingoverFatigueAWaytoSuccess D.FatigueAnEarlySignofHealthProblems
氮及其化合物与人类生产生活息息相关． 1在现代化学中常利用上的特征谱线来鉴定元素称为光谱分析． 2基态N原子的价电子占据的能量最高的能级是价电子在该能级上的排布遵循的原则是． 3NH4BF4氟硼酸铵是合成氮化硼纳米管的原料之一．lmolNH4BF4含有mol配位键． 4化肥NH42SO4中会含有N4H4SO42该物质在水中电离出SO42﹣和N4H44+N4H44+遇到碱性溶液会生成一种形似白磷P4的N4分子．N4比P4的沸点原因为． 5尿素H2NCONH2也是一种常用的化肥其分子中原子的杂化轨道类型有σ键和π键数目之比为． 6Cu3N具有良好的电学和光学性能其晶胞结构如图．Cu+半径为apmN3﹣半径为bpmCu+和N3﹣都是紧密接触的刚性小球则N3﹣的配位数为Cu3N的密度为g•cm﹣3．阿伏加德罗常数用NA表示
ABristolteacherhasprovedthatyoudon'thavetoearnafortunetobeabletomakeendsmeet.KathKellyspentayearlivingonjustonepoundperday.Thismoneydidnotincludetherentofherroomonasharedflatortheutilitybills水电费whichwereallpaidinadvance.1Themotivationfortheexperimentcamefromherconcernaboutbuyingaweddingpresentforherbrotherandhisfiancée.Atthetimeshehadanincomeof﹩10000ayearwhichmeantthatshewasfairlyhardupmostofthetime. 2Ifshespentlessthan﹩1adayshecouldnotcarrythemoneyover.Shealsodecidednottoborrowfromfriends. Kathwasoftenattendingfreeeventsfrombooklaunchestogalleryopenings…3Buseswereoutsoeveryjourneyhadtobemadeonfootorbybicycleandasshecouldn'taffordphonecallsshewouldvisitfriendsorleavethemnotesifshehadanythingtotellthem. 4Insteadofmeetingforlunchinacafeasweusedtowe'dtakesandwichesandeatthemonabenchintheparksheexplains. AttheendoftheyearKathwasabletobuyherbrotherandhisnewwifea﹩1300lifemembershipoftheNationalTrustasaweddingpresentwithhersavings.5Whilehelpingoutonafarmshemethercurrentboyfriendandfoundtrueloveatlast. A.Shewouldattendanyeventthatmighthavefreesnacks. B.Shemadesoupsfromwhatevervegetablesshecouldfind C.Fromthebeginningshesetsomeverystrictrulesforherself. D.Kath'spromiseofpovertyactuallymeantshewentoutmore E.Kathsaysherfriendsweregreataboutthechangeinherlifestyle F.Howeveritdidhavetocovereverythingelseincludingclothingandfood G.Besidesachievingwhatshe'dsetouttodoKath'sexperimentalsohadanunexpectedresult.
FiveyearsagowhenItaughtartataschoolinSeattleIusedTinkertoysasatestatthebeginningofatermtofindoutsomethingaboutmystudents.IputasmallsetofTinkertoysinfrontofeachstudentandsaidMakesomethingoutoftheTinkertoys.Youhave45minutestodayand45minuteseachdayfortherestoftheweek.Afewstudentshesitatedtostart.Theywaitedtoseetherestoftheclasswoulddo.Severalotherscheckedtheinstructionsandmadesomethingaccordingtooneofthemodelplansprovided.Anothergroupbuiltsomethingoutoftheirownimaginations. OnceIhadaboywhoworkedexperimentallywithTinkertoysinhisfreetime.Hisconstructionsfilledashelfintheartclassroomandagoodpartofhisbedroomathome.Iwasdelightedatthepresenceofsuchastudent.Herewasanexceptionallycreativemindatwork.HispresencemeantthatIhadanunexpectedteachingassistantinclasswhosecreativitywouldinfect感染otherstudents. Encouragingthiskindofthinkinghasadownside.Irantheriskoflosingthosestudentswhohadadifferentstyleofthinking.WithoutfailonewoulddeclareButI'mjustnotcreative. Doyoudreamatnightwhenyou'reasleep? Ohsure. Sotellmeoneofyourmostinterestingdreams.Thestudentwouldtellsomethingwildlyimaginative.Flyingintheskyorinatimemachineorgrowingthreeheads.That'sprettycreative.Whodoesthatforyou? Nobody.Idoit. Really﹣atnightwhenyou'reasleep? Sure. Trydoingitinthedaytimeinclassokay? 1TheteacherusedTinkertoysinclassinorderto. A.knowmoreaboutthestudents B.makethelessonsmoreexciting C.raisethestudents'interestinart D.teachthestudentsabouttoydesign 2WhatdoweknowabouttheboymentionedinParagraph3? A.Helikedtohelphisteacher. B.Hepreferredtostudyalone. C.Hewasactiveinclass. D.Hewasimaginative. 3WhatdoestheunderlinedworddownsideinParagraph4probablymean? A.Mistake. B.Disadvantage. C.Difficulty. D.Burden. 4Whydidtheteacheraskthestudentstotalkabouttheirdreams? A.Tohelpthemtoseetheircreativity. B.Tofindoutabouttheirsleepinghabits. C.Tohelpthemtoimprovetheirmemory. D.Tofindoutabouttheirwaysofthinking.
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.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限一词2.只允许修改10处多者从第11处起不计分. Dearfriends Howtimeflying!Thetwo﹣weekexchangeprogramhascometotheend.Lookingbackatthepastdayswearegladtosaywehavebeenbenefitedalotfromtheprogram. InthepasttwoweekswecommunicatedwitheachotherfacetofaceinEnglish.NotonlyhavewemadegreatprogressesinouroralEnglishbutwealsohavelearnedmoreaboutyourculture.Besideswewillneverforgetthefarewellpartythatweenjoyedyourpassionatesongsanddancesaswellasthedelicioustraditionallyfoodofyourcountry.Thetimewespenttogetheristoounforgettablethatwewillvaluethemforever. Wedohopetomeetyouagaininthenearfuture!
Incaseyoufeelnervousduringtheinterviewyoucanmakefullpreparations. A.inreturn B.intime C.incommon D.inadvance
Readyformorefunonboard?ConnecttoroKKiWi﹣Fiandtuneintoexcitingvideosthroughoutyourflight!Experiencethrillingentertainmentanddiscovernewworldsasyouenjoyavarietyofinternationalandlocalcontentsusingyourpersonalmobiledevice.Tofindoutwhat'sscreeningonroKKithismonthsimplyvisitwww.rokki.comandcatchthemoviesforfree! PolisEvo Theworldconflictswhentwocopsonefromthecityandtheotherfromasmalltownmeet.AsthetwocontrastingpersonalitiesgoonamissiontotakedownMalaysia'sbiggestdruglordthetwomustlearntoworktogethertoweakenacold﹣bloodeddrugorganization. TheJourney WhenBeereturnstoMalaysiaforthefirsttimeinadecadesheintroducesherconservativefatherUncleChuantoherhappy﹣go﹣luckyBritishfiancéBenji.Despitelanguagebarriersculturaldifferencesandoriginalhesitationfrombothpartiesthetwomencometorealizethattheirpriorities优先权areessentiallyoneandthesame. OlaBola Setinthe1980sduringadisorderlyeconomicperiodOlaBolatellsthestoryofanunlikelyteamofMalaysianfootballersthathasonelastchanceatinternationalglorytoqualifyforthe1980OlympicGames.Disturbedbydisagreementsthatthreatentotearthemaparttheteamhastoovercometheirindividualdifferencesanduniteforthesakeoftheentirecountry. MyPassion﹣DivinginPulauPerhentian JoinAirAsiaAllstarsAndrewScottandAnimEzatibothonanoceanadventure.Theyfacethechallengeofopenwaterdivingforthefirsttime.FromscubatrainingtodiscoveringthebeautyofPerhentianIslandMyPassionfollowsthemontheirexcitingjourneyofcourageastheyconquertheirfearsandmanageitmakingtheirgreatjoy! 1WhatisPolisEvomainlyabout? A.TheunionofaMalaysianfootballteam. B.Twopolicemenjoinforcesandbeatadruggroup. C.Twomenfromdifferentculturesaccepteachother. D.Ahighlychallengingandsuccessfuloceanadventure. 2Whichwillbethebestchoiceifyouarefondofdiving? A.OlaBola. B.MyPassion. C.PolisEvo. D.TheJourney. 3Whatcanbethebesttitleofthetext? A.EntertainmentatYourFingertips B.WellReceivedCinemaFilms C.Bestsellersonwww.rokki.com D.GreatlyPraisedMovies
CoCO3主要用作选矿剂伪装涂料的颜料等．用钴矿石含Co2O3•CoO及少量Fe2O3Al2O3MnO2等生产CoCO3的流程如下 下表列出了几种离子生成氢氧化物沉淀的pH“沉淀完全”是指溶液中离子浓度低于1.0×10﹣5mol•L﹣1 1写出“浸取”步骤Co2O3•CoO发生反应的离子方程式． 2“浸取”步骤除Co2O3•CoO外钴矿石中还能被Na2SO3还原的物质有填化学式． 3加NaClO3的目的是氧化Fe2+NaClO3的用量过多会造成的不良后果是． 4“沉钴”步骤向CoCl2溶液加入NH4HCO3溶液需要55～57℃条件下进行温度控制在55～57℃的原因为． 5已知金属萃取剂对金属离子的萃取率与pH的关系如图所示．请补充完整由“氧化”后的溶液制备CoCO3的实验方案向“氧化”后的溶液中加入得较纯CoCl2溶液加入NH4HCO3溶液沉钴得CoCO3．实验中须使用试剂Na2CO3溶液金属萃取剂盐酸．
假如你叫王平根据图表提示给你的加拿大网友Smith写一封信介绍你的寒假生活共20天可根据自己的实际情况添加细节. 注意1.词数100左右2.开头已经给出不计入总词数. DearSmith Howareyou?Howtimeflies!NowthewintervacationwasoverandIhavecomebacktoschoolagain. Yours WangPing
热门题库
更多
高一下学期生物
高二上学期数学
高二上学期物理
高二上学期英语
高二上学期生物
高二下学期数学
高二上学期化学
高二下学期物理
高三下学期物理
高三上学期物理
高三上学期生物
高三上学期化学
高二下学期化学
高二下学期生物
高三下学期生物
高三下学期化学
湘公网安备 43130202000226号