首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
某校高三文科分为四个班．高三数学调研测试后，随机地在各班抽取部分学生进行测试成绩统计，各班被抽取的学生人数恰好成等差数列，人数最少的班被抽取了22人．抽取出来的所有学生的测试成绩统计结果的频率分布条...
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
为了解甲乙两校高三年级学生某次期末联考地理成绩情况从这两学校中分别随机抽取30名高三年级的地理成绩百
从某校高三上学期期末数学考试成绩中随机抽取了60名学生的成绩得到频率分布直方图如如根据频率分布直方图
某校高三文科分为四个班.高三数学调研测试后随机地在各班抽取部分学生进行测试成绩统计各班被抽取的学生人
某校高三文科分为五个班.高三数学测试后随机地在各班抽取部分学生进行成绩统计各班被抽取的学生人数恰好成
某市有A.B.C.三所学校共有高三文科学生1500人且A.B.C.三所学校的高三文科学生人数成等差数
某学校高三年级有两个文科班四个理科班现每个班指定1人对各班的卫生进行检查.若每班只安排一人检查且文科
为了了解某校高三学生的视力情况随机地抽查了该校100名高三学生的视力情况得到频率分布直方图如下图.由
64
54
48
27
为调查甲乙两校高三年级学生某次联考数学成绩情况用简单随机抽样从这两校中各抽取30名高三年级学生以他们
下面几种推理过程是演绎推理的是
某校高三有8个班，1班有51人，2班有53人，3班有52人，由此推各班人数都超过50人
由三角形的性质，推测空间四面体的性质
平行四边形的对角线互相平分，菱形是平行四边形，所以菱形的对角线互相平分
在数列{a
n
}中，a
1
＝1，a
n
＝
，由此归纳出{a
n
}的通项公式
下列四个判断某校高三1班的人数和高三2班的人数分别是和某次数学测试平均分分别是则这两个班的数学平均
0个
1个
2个
3个
某学校高三年级有两个文科班四个理科班现每个班指定1人对各班的卫生进行检查.若每班只安排一人检查且文科
某校高二文科分四个班各班人数恰好成等差数列高二数学调研测试后对四个文科班的学生试卷按每班人数进行分
某校高三学生数学调研测试后随机地抽取部分学生进行成绩统计如图4所示是抽取出恶报的所有学生的测试成绩统
下列四个判断某校高三1班的人数和高三2班的人数分别是和某次数学测试平均分分别是则这两个班的数学平均
0个
1个
2个
3个
为调查甲乙两校高三年级学生某次联考数学成绩情况用简单随机抽样从这两校中各抽取30名高三年级学生以他们
某校高三年级有12个班每个班随机的按1～50号排学号为了了解某项情况要求每班学号为20的同学去开座谈
抽签法
随机数表法
系统抽样法
以上都不是
联合体某校高三文科4个班级共200位学生其中80位学生参加了数学兴趣小组155位学生参加了英语兴趣小
某市有
B.C.三所学校，共有高三文科学生1 500人，且A.
C.三所学校的高三文科学生人数成等差数列，在三月进行全市联考后，准备用分层抽样的方法从所有高三文科学生中抽取容量为120的样本，进行成绩分析，则应从B.校学生中抽取( ) A.30人 B.36人
40人
45人
某市教育局为了了解高三学生体育达标情况对全市高三学生进行了体能测试经分析全市学生体能测试成绩X服从正
某校初三共有四个班在一次英语测试中四个班的平均分与各班参加人数如下表则本校初三参加这次英语测试的所有
83.1
83.2
83.4
82.5
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
Theaveragemanfailsnotbecausehelacksabilitybutbecausehelackstheabilitytoconwhatheshoulddo.
下列有关说法正确的是
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
常温下将0.1000mol/L的NaOH溶液分别滴加到20.00mL浓度均为0.1000mol/L的一元酸HX和HY溶液中溶液的pH与所加NaOH体积的关系如图所示下列叙述错误的是
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
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
三盐基硫酸铅3PbO•PbSO4•H2O具有良好的热稳定性耐热性电绝缘性是目前用量最大的热稳定剂工业上利用铅废渣主要含PbSO4PbCl2SiO2制取三盐基硫酸铅及PbO2工艺流程如下 已知 ①“浸出”过程发生的反应PbSO4s+2Cl﹣aq⇌PbCl2+SO42﹣aq和PbCl2s+2Cl﹣aq⇌PbCl42﹣aq△H＞0 ②KspPbCl2＝1.7×10﹣5KspPbSO4＝2.5×10﹣8 回答下列问题 1铅渣“浸出”后“浸出渣”的主要成分是CaSO4和． 2“操作1”通过多步操作得到PbCl2分别为过滤洗涤． 3“转化”后得到PbSO4当cCl﹣＝0.100mol/L时cSO42﹣＝结果保留一位小数“转化”时需要升高体系温度其原因是． 4写出合成三盐基硫酸铅的化学方程式． 5氨水络合后铅的存在形态是[PbOHSO4]﹣写出“氧化”发生的离子反应方程式． 6一种新型的铅锂电池的充放电示意图如下写出放电时的正极反应式．
钠的化合物用途广泛回答下列问题 1多硫化钠Na2Sx用作聚合的终止剂．钠原子价层电子的轨道表达式电子排布图为基态S原子电子占据最高能级的电子云轮廓图为其中Na2S4中存在的化学键有． A．离子键B．极性共价键C．π键D．非极性共价键 2rS2﹣＞rNa+的原因是． 3Na2SO3常用作工业的脱氧剂和漂白剂其阴离子的中心原子的杂化形式是空间构型是． 4下表列出了钠的卤化物的熔点 ①NaF的熔点比NaI的熔点高的原因是 ②NaCl晶格能是786kJ/mol则NaF的晶格能可能是． A.704kJ/molB.747kJ/molC928kJ/mol 5NaH具有NaCl型的立方晶体结构已知NaH晶体的晶胞参数a＝488pmNa+半径为102pm则H﹣的半径为pmNaH的理论密度是g•cm﹣3保留三位有效数字．[H﹣1Na﹣23] 6首例被发现的带结晶水的超导材料晶体化学式为Na0.35CoOx•1.3H2O具有……﹣CoO2﹣H2O﹣Na﹣H2O﹣CoO2﹣H2O﹣Na﹣H2O﹣……层状结构已知CoOx层的构型部分如图其中粗线画出的是其二维晶跑则x＝．
热门题库
更多
教案备课库
高一上学期生物
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
，由此归纳出{an}的通项公式
湘公网安备 43130202000226号