首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
在平行四边形ABCD中,||=2,||=4,∠ABC=60°,E,F分别是BC,CD的中点,DE与AF交于H,则•的值( )
查看本题答案
包含此试题的试卷
高三下学期数学《》真题及答案
点击查看
你可能感兴趣的试题
在平行四边形ABCD中ADAB=12∠A.=60°AB=4cm则四边形面积为_______
下列命题①一组对边平行另一组对边相等的四边形是平行四边形②对角线互相平分的四边形是平行四边形③在四边
0个
1个
3个
4个
平行四边形ABCD中AC平分∠DABAB=2则平行四边形ABCD的周长为
4
6
8
12
在平行四边形ABCD中已知AB=4cmBC=9cm平行四边形ABCD的面积为18cm2则∠B.是
45°
30°
60°
22.5°
已知在平行四边形ABCD中AB=4BC=6则此平行四边形的周长为.
如图在平行四边形ABCD中AB=4BC=5∠ABC=60°平行四边形ABCD的对角线ACBD交于点O
如图在四边形ABCD中对角线ACBD相交于点O.AE=CF且四边形DEBF是平行四边形.求证四边形A
平行四边形ABCD中∠ABC的角平分线BE将边AD分成长度为5cm和6cm的两部分则平行四边形ABC
如图四边形ABCD是平行四边形BE平分∠ABCCF平分∠BCDBE.CF交于点G.若使那么平行四边形
∠ABC=60°
AB:BC=1:4
AB:BC=5:2
AB:BC=5:8
已知平行四边形ABCD对角线ACBD交于点O.1若AB=BC则平行四边形ABCD是_________
已知园边形ABCD中AC与BD交于点O.如果只给出条件AB∥CD那么还不能判定四边形ABCD为平行四
①②
①③④
②③
②③④
如图四边形ABCD是平行四边形BE平分∠ABCCF平分∠BCDBECF交于点G.若使EF=AD那么平
∠ABC=60°
AB:BC=1:4
AB:BC=5:2
AB:BC=5:8
如图在平行四边形ABCD中BF=DE.求证四边形AFCE是平行四边形.解
已知平行四边形ABCD的对角线交于点O则下列命题是假命题的是
若AC⊥BD,则平行四边形ABCD是菱形
若BO=2AO,则平行四边形ABCD是菱形
若AB=AD,则平行四边形ABCD是菱形
若∠ABD=∠CBD,则平行四边形ABCD是菱形
在四边形ABCD中AC与BD相交于点O.如果只给出条件AB∥CD那么还不能判定四边形ABCD为平行四
3个
4个
5个
6个
已知四边形ABCD中AC交BD于点O.如果只给条件AB∥CD那么还不能判定四边形ABCD为平行四边形
1
2
3
4
如图在平行四边形ABCD中BM是∠ABC的平分线交CD于点M.且MC=2平行四边形ABCD的周长是1
1
2
3
4
已知四边形ABCD中AC与BD交于点O.如果只给出条件AB∥CD那么可以判定四边形ABCD是平行四边
①②
①③④
②③
②③④
如图在▱ABCD中对角线ACBD交于点O并且∠DAC=60°∠ADB=15°.点E是AD边上一动点延
平行四边形→矩形→平行四边形→菱形→平行四边形
平行四边形→菱形→平行四边形→矩形→平行四边形
平行四边形→矩形→平行四边形→正方形→平行四边形
平行四边形→矩形→菱形→正方形→平行四边形
已知平行四边形ABCD与平行四边形
′
′
′
′相似,AB=3,对应边A.′B.′=4,若平行四边形ABCD的面积为18,则平行四边形A.′B.′C.′D.′的面积为( ) A.
B.
C.24D.32
热门试题
更多
O2辅助的“Al﹣CO2电池”既可有效利用CO2也可制得重要的化工原料草酸铝[Al2C2O43]工作原理如图所示.下列说法错误的是
Ibelievethatlife'stoughestlessonsarebestlearnedthroughpersonalexperience.Throughoutmychildhoodmygrandmother1mewithunconditionallovebutalwaysstressedYou'renot2thananyoneelsebutyou'rejustasgoodasanyone.Treatotherswith3andyouwouldearnrespect4. HoweverIneverreally5ituntilIwasseventeenandgotasummerjobasajanitor.AsI6floorsandtoiletsIwatchedpeoplewalkrightbymeandignoremy7.Thismademefeelangryandwonderwhytheytreatedmesopoorly. WhenI8tomygrandmothersheofferedmesomewordsof9andremindedmenevertoforgetthefeelingofbeing10andtodothebestjobbecauseitwasstillmywork11whichIshouldtakepride.Sheaddedthatitwouldmakemeabettermansomeday. Makemeabettermansomeday?Shemustbe12Ithoughttomyself.ButIneededthejobto13collegeandtherewerefewotherjobsavailable14IbitmytongueandkeptonworkingasbestasIcouldforthe15ofthesummer. Todaywhenaskedwhatjobhelpedpreparemetogainthe16ofakeyuniversityItellpeopleitwasmysummerjobcleaningrestroomsthat17measamananddowntheroadasaneducator. Asyoucansee18canonlybeunderstoodbywalkinginalotofdifferentshoes.SoIsuggeststudents19oftheircomfortzonesandgetdeeplyinvolvedindifferentworkandcommunityexperience.It'sessentialforpeopletofind20ineverypersonnomatterwhotheyareorwhattheydoforaliving. 1A.afforded B.offered C.gave D.provided 2A.better B.more C.higher D.lower 3A.care B.anger C.dignity D.age 4A.inorder B.inneed C.inadvance D.inreturn 5A.worried B.understood C.admitted D.appreciated 6A.cleaned B.repaired C.swept D.mopped 7A.glance B.presence C.instruction D.commitment 8A.attended B.suggested C.explained D.complained 9A.belief B.surprise C.comfort D.excitement 10A.horrible B.invisible C.angry D.poor 11A.in B.for C.on D.to 12A.promising B.joking C.misleading D.outstanding 13A.payfor B.gofor C.lookfor D.sendfor 14A.or B.however C.but D.so 15A.heat B.time C.rest D.hope 16A.friendship B.relationship C.leadership D.hardship 17A.served B.shaped C.viewed D.treated 18A.facts B.method C.lessons D.theories 19A.getout B.dropout C.giveout D.runout 20A.secret B.fault C.way D.value
Arecentsurveyshowsthatroughly85percentofpeoplefeelphysicalsymptomsofstress.1andtheywillhelpyoufeelmoreenergetictomorrow •Doubleyourchews Chewingisasuper-importantpartofthedigestionprocess.Chewingmakesiteasierforyourbodytobreakdownfoodandturnitintoenergy.Themostpropernumberofchewsperbiteisunclear.2.Itwillbeeasyforyourbodytobreakdownthefoodandstoreenergy. •Drinkonelesscupofcoffee Althoughcaffeineincoffeeblocksyourbrainfromreceivingadenosinewhichcausestirednessitdoesn'tstopyourbodyfromproducingit.Sooncethecaffeinedisappearsit'sthebuildupofadenosinethatcausesyoutocrashandreachformorecaffeinecreatingabadcircle.3butdrinkinglesscoffeecanhelpyoufeelmoreenergeticoverthelongterm. •Takeafewdeepbreaths Bynotbreathingdeeplyenoughyouendupsendingasignaltoyournervoussystemthatincreasesyouranxietyevenfurther.Changingyourbreathinghabitsbytakingafewlongslowbreathsthroughoutthedayreducesthestressresponsewhileenergizingyourcells.4Simplybreatheinthroughyournoseforacountofthreeandoutthroughyourmouthforacountofthree.Repeatasnecessary. •5 Takesometimetoreflectonthepositivebywritingdownthreethingsthatwentsmoothlyduringyourdayorjustitemsyoufeelgratefulfor.Thisexercisecanprepareyourmindforwhat'sgoingrightinyourlifehittingthebrakesonstressincreaseswhilehelpingtoprotectyourenergyreserves. A.Setdownwhatwentwelltoday B.Tryanexercisetoachievethis C.Reflectonyourdaysometimes D.Reducingyourrelianceonitsoundsscary E.Takealookatthesmallchangesyoucanmaketoday F.Shallowbreathingisoneoftheannoyingsideeffectsofstress G.Howeverit'sbeensuggestedthat25to40timeswillbebeneficial
Inthisarticleyouneedtobackupgeneralstatementswithexamples. A.specific B.permanent C.abstract D.universal
Whileit'sthebooksthatmakealibrarybeinginlovelysurroundingsmayprovideinspirationandhelpyoutoworkalittlebitharder.Herearesomeofthecoolestlibrariesoftheworld. LibraryofBirmingham﹣BirminghamU.K. ThenewLibraryofBirminghamissaidtobenotonlyBritain'sbiggestpubliclibrarybutalsothelargestinEurope.DesignedbyDutcharchitectsthisreplacementfortheBirminghamCentralLibrarywasopenedin2013andhasawealthofresourceswithinitswallsincludingadultandkids'librariesmusiccollectionsaShakespeareMemorialRoomandevenagymroom.Gardenscrowntheroofwhilethechangingseasonsbringvariationsintheshadowsandreflectionsinside. NationalLibraryofFrance﹣ParisFrance TheNationalLibraryofFrancewhichnowcontainsanastonishingcollectionof30milliondatesbacktothe14thcenturyandthisroyallibrarywassetupattheLouvrebyKingCharlesV.ThelibrarywasmovedtoRuedeRichelieusitein1868withmajordesignworkcarriedoutbyFrencharchitectsHenriLabrousteandfollowinghisdeathJean﹣LouisPascal.Herethereadingroomsareeleganceitself.Therearemorethanjustbookstobefound. StateLibraryofNewSouthWales﹣SydneyAustralia ThepublicStateLibraryofNewSouthWalesholdsthehonorofbeingtheoldestinstitutionofkindinAustralia.ItwasoriginallytheAustralianSubscriptionLibraryin1826butitwasn'tuntil1942thatitspermanenthomewasready.DesignedbySydneyarchitectWalterLibertyVernonandcompletedin1910themagnificentsandstoneMitchellWingisoneofthearchitecturalhighlights. SeattleCentralLibrary﹣SeattleWashingtonUSA SeattleCentralLibrary'sdistinctivedesignensuresitstandsout.ArchitectRemKoolhaasisoneofthenamesattachedtoitsdesign.Architectssoughttoenvelopthe11﹣storybuildingwithalayeroftransparencyusingaskinofglassandmetal.Thefinishedarticlehousesabout1.45millionbooksandotherthingsaswellasmorethan400computersavailableforpublicuse.Thebuildingwhichopenedin2004wasincludedontheAmericanInstituteofArchitects'listofAmerica's150favoritebuildingsin2007. 1Whichofthefollowinglibraryhasthelongesthistory? A.LibraryofBirmingham. B.NationalLibraryofFrance. C.StateLibraryofNewSouthWales. D.SeattleCentralLibrary. 2WhatcanyoudoinLibraryofBirmingham? A.Attendaconcert. B.Actaplay. C.Takesomeexercise. D.Enjoynewtechnology. 3WhatdoNationalLibraryofFranceandSeattleCentralLibraryhaveincommon? A.Theyhavecomputersavailable. B.Theyweremovedtoanewplace. C.Theywonawardsforarchitecture. D.Theyweredesignedbymorethanoneperson.
IdecidedtoskitotheNorthPole.ItwasafterIsawanadvertisementinanewspaperlookingforpeopletojoinateamtoski350milestotheNorthPole.Backin1996therehadneverbeenawomanfromtheUKwhohadaccomplishedthischallenge.IwonderedwhatitwouldbeliketosurviveintemperaturescoldenoughtofreezeyourfleshinsecondssoIsentofffortheapplicationform. Theapplicationformfullofpicturesofmaleexploresarrived.ThewordsAreyoumanenoughfortheultimate极限的challenge?mademeangryandevenmoredeterminedtogetontheteam. Over500individualsappliedforaplaceintheteamandtheselectionprocessincludedphysicalandpsychologicaltestsdesignedtopickthebestgroup.InonetesttherewasahugeropeladderwehadtoclimbandIfrozeatthetopbecauseIhaveafearofheights.Ithoughtmyhopeswerefadingasmostotherapplicantssailedpastleavingmebehind.ButtwoothershelpedmeoverandlaterIfoundoutthattheorganizerswerenotlookingforamazingindividualsbutgreatteamplayersandthismomenthadshownthemwhowouldtakecareofothersintheteam. Ihadrevealed显示myweaknessandinaplaceliketheArcticyouhavetobeyourselfasthereisnowheretohide.Thesepersonalitiesofaskingforhelpandshowingweaknessarenecessaryforwomentomaster. IrealizedthatbybeingmyselfIcouldsucceed.Iwasselectedfortheteam.IrealizedthatIcouldachievemorethanIeverimagined-moreimportantlybysharingmystorywithothersIcouldinspirethemtotakeastepintothenewworldandrevealmoreoftheirabilities. 1Howdidtheauthorreactonseeingtheadvertisement? A.Shegotcross. B.Shewasdetermined. C.Shegotfrightened. D.Shewashesitating. 2Whatdidtheorganizersviewasthemostimportantintheselectionofnewhands? A.Personalquality. B.Individual-ability. C.Spiritofteamwork. D.Couragetochallenge. 3Whatdoestheautherthinkofwomen'sshowingweakness? A.Beneficial. B.Shameful. C.Merciful. D.Disturbing. 4What'stheintentionoftheauthorinwritingthispassage? A.Toinspireustoprepareforourfuturegoal. B.Toadvisewomenhowtoturntoothers. C.Tomakesuggestionstoherteammembers. D.Toencouragepeopletoexploretheunknown.
ScientistshaveconfirmedthatalmostalltheicecoveringtheBeringSeahasmelted1throwcommunitieslivingarounditsshoresintodisorder.Theregion'sicecover2normalpersistsforatleastanothermonthandthisyearithasdisappeared3earlythananyotheryearexcept2017. Located4thenorthernPacificOceanbetweenAlaskaandrussiatheBeringSeaisexperiencingtheclimatechangeandhasalreadydrawn5attendthisyearforunprecedentedlevelsofwintermelting.InFebruaryrisingArctictemperaturesledtoaroundhalftheregion'sdisappearinginthespaceoftwoweeks. Areport6releasebytheInternationalArcticResearchCentreattheUniversityofAlaskaFairbankshasoutlinedthereal-world7effectofthesestunningenvironmentalchangesonthemanycommunities8inhabittheBeringSearegion. IntheirreporttheInternationalArcticResearchCentrescientists9writethatwhilenoteveryyearwillbeasbadasthisoneiceformationislikelytoremainlowiftheBeringSea'swatersremainwarm.They10warnthatcommunitieswillneedtoprepareformorewinterswithlowseaiceandstormyconditions.
WhenIwasfiveorsixyearsoldIrememberwatchingTVandseeingotherchildrensufferinotherpartsoftheworld.IwouldsaytomyselfWhenIgrowupwhenIcangetrichIwillsavekidsallovertheworld. At17IstartedmycareerhereinAmericaandbytheageof18Istartedmyfirstcharityorganization.Iwentontoteamupwithotherorganizationsinthefollowingyearsandmethelpedandevenlostsomeofthemostbeautifulsoulsternsix-year-oldJasminaAnemawhopassedawayin2010fromleukemia白血病whosestoryinspiredthousandstovolunteerasdonorsto2012whengrandmotherlostherbattlewithcancerwhichistheveryreasonandthedrivingforcebehindtheClaraLionelFoundationCLF.We'reallhuman.Andwealljustwantachanceachanceatlifeachanceineducationachanceatafuturereally.AndatCLFourmissionistoimpactasmanylivesaspossiblebutitstartswithjustone. Peoplemakeitseemtoohardtodocharitywork.Thetruthisyoudon'thavetoberichtohelpothers.Youdon'tneedtobefamous.Youdon'tevenhavetobecollege-educated.Butitstartswithyourneighborthepersonrightnexttoyouthepersonsittingnexttoyouinclassthekiddowntheblockinyourneighborhood.Youjustdowhateveryoucantohelpinanywaythatyoucan.AndtodayIwanttochallengeeachofyoutomakeacommitmenttohelponepersononeorganizationonesituationthattouchesyourheart.MygrandmotheralwaysusedtosayIfyou'vegotadollarthere'splentytoshare. 1Whatdidtheauthorwanttodoatayoungage? A.WatchTV. B.Growupquickly. C.Becomewealthy. D.Helpotherchildren. 2WhatdirectlycausedtheauthortocreateanddeveloptheCLF? A.Asix-year-oldkid'srequest. B.Hergrandmother'sdeathofcancer. C.Manyvolunteers'inspiration. D.Otherorganizations'encouragement. 3WhatdoestheunderlinedwordoneinParagraph2referto? A.Achance. B.Atask. C.Alife. D.Anorganization. 4Whatdoestheauthorsuggestpeopledointhelastparagraph? A.Dolittlethingstohelpthosearoundthem. B.Workhardtogetacollegeeducation. C.Challengetheirfriendstoofferhelp. D.Docharityworkwhateveryouare.
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. Onedaymylittlebrotherboughtanicecreaminthestreetenjoyingtoeatingit.Unexpectedhesawhisfriendcomingtowardshimsohehurriedlyhidtheicecreamsbehindhim.Afterhegreetedhisfriendtheybegintotalk.Hisfriendhadthedogwithhim.Whenhestoppedtotalkwithhisbrotherhisdogmovedaround.Thedogwassuchgladtofindtheicecreaminmybrother'shandanditbegantoeatitwithgreaterpleasure.Mybrotherfeltembarrassedthathehadn'tsharedtheicecreamforhisfriendhegavetheicecreamtothedog.Thenheboughtanothertwoforhisfriendandhimself.
氮及其化合物对环境具有显著影响. 1已知汽车气缸中氮及其化合物发生如下反应 N2g+O2g═2NOg△H=+180kJ/mol N2g+2O2g═2NO2g△H=+68kJ/mol 则2NOg+O2g═2NO2g△H=kJ/mol. 2查阅资料2NOg+O2g⇌2NO2g的反应历程分两步 Ⅰ.2NOg⇌N2O2g快 Ⅱ.N2O2g+O2g⇌2NO2g慢 反应I的活化能E1与反应Ⅱ的活化能E2的大小关系为E1E2填“>”“<”或“=”2NOg+O2g⇌2NO2g的反应速率主要由反应填“I”或“Ⅱ”决定. 3温度为T1时在容积为1L的恒容密闭容器中充入0.6molNO2g发生反应2NO2g⇌2NOg+O2g△H>0达平衡时cO2=0.2mol/L. ①反应的平衡常数K=. ②实验测得v正=k正•c2NO2v逆=k逆•c2NO•cO2k正k逆为速率常数仅受温度影响.当温度为T2时反应达到平衡状态若k正=k逆则T1T2填“>”或“<”得出该结论的理由是. 4NO2﹣是水体中的主要污染物.碱性条件下强氧化剂过硫酸钠Na2S2O8可脱除水体中的NO2﹣该反应的离子方程式是. 不同温度下达到平衡时NO2﹣的脱除率与过硫酸钠初始浓度的关系如图所示. 比较ab点的反应速率vavb填“>”“<”或“=”.若要提高NO2﹣的脱除率可以采取的措施有写出一点即可.
假定你是李华.在上周的国际文化节上你结识了喜欢中国书法的交换生Peter.你准备赠送他一本英文版中国书法鉴赏.请给他写一封电子邮件内容包括 1.写信目的 2.简介该书 3.询问地址. 注意 1.词数100左右邮件的开头与结尾己给出 2.可以适当增加细节以使行文连贯 3.参考词汇书法calligraphy鉴赏appreciation. DearPeter Howarethingswithyou? Lookingforwardtoyourreply. Yours LiHua
假定你是李华你用英语给即将来访的英国学生Tom写一封邮件简要介绍自己当地的文化. 内容包括 1.家庭与交友 2.小吃与美食 3.主要的节日 4.交通与旅游. 注意 1.词数100左右. 2.可以适当增加细节以使行文连贯.
假定你是李华收到英国笔友George的邮件请你介绍中国家庭聚会的情况饮食时间活动等.请给他写一封邮件. 注意1.词数100左右 2.可适当增加细节以使行文连贯. DearGeorge Yours LiHua
25℃时向等物质的量浓度的Na2S和Na2CO3的混合溶液中滴加NiNO32溶液产生NiSNiCO3两种沉淀溶液中阳离子阴离子浓度关系如图所示[已知25℃时KspNiS=3.0×10﹣19KspNiCO3=1.0×10﹣7].下列说法正确的是
Forthefirsttimein94yearsthePalaceMuseumhasextendeditsopeninghoursallowingthepublictocelebratetheLanternFestivalatnightintheancientpalace. About3000luckyvisitorsreceivedfreeticketsfromthegovernmentamong1wasZhangZhifua77-year-oldpublicsecurityvolunteer.It'samarkofgratitudeforhervolunteerwork.Itis21trueanhonortobegrantedthisspecialprivilegeZhangsaid. Toguaranteethe3safeofthepalacefestivalorganizers4planthisyear'sLanternFestivaleventusedLEDlightsratherthantraditionalpaperlanternsandredcandles.It'safascinatingeventforvisitorstoabsorb5theyinthefestiveatmosphereinthemuseum.DiscussionofthePalaceMuseum'snewlooklitupsocialmediafollowingTuesday'sdisplay. SincehebecamedirectorofthePalaceMuseumShanJixiang6bringmanychangestotheworld's7largeimperialcomplex建筑群.Onceinaspeechthe64-year-olddirectorsharedhisideaabouthowtomaketraditional8treasurecomealiveagain.Hesaid9matterstoamuseumisnothowmanyvisitorstheyhavebuthowclosetheyare10people'sdailylives.
Celiacdiseaseisrelativelycommon.InfactaccordingtotheCeliacDiseaseFoundationtheautoimmunedisorderaffects1in100peopleworldwide.Howeverwhileitismanageable-thoselivingwithceliacaresimplyadvisedtochangetheirdietandtoavoidgluten面筋-ifandwhenthoselivingwiththeconditiondoeatglutenitcausesanimmune免疫responseinthebody.AccordingtoresearchpublishedinthejournalBMCBiotechnologyanewdrugmayoffermuch-neededrelieftothoselivingwiththecondition. ThemedicalproductwhichhasyettobenamedisbeingdevelopedatViennaUniversityofTechnologyincooperationwithSciotecDiagnosticTechnologiesGmbHAndwhileotherceliacmedicinesseektochangeone'simmunesystemtomakeitlesssensitivethisdrugwillessentiallyturnofftheirritant刺激物.Accordingtoapressreleasetheproductwilldirectlyattack…glutenmoleculestomakethemharmless. ProfessorOliverspadiutheadoftheIntegratedBioprocessdevelopmentResearchgroupatTuWienexplainedtheprocessinastatement.Ourbodiesproduceantibodiespreciselylikeakeytoalock.Thisimmuneresponsemakesthoseantigensharmless.Ofcoursetheprocesssoundssimplerthanitis. TheformationofsuchproteinsinabacteriumisahighlycomplicatedprocessSpadiutexplained.Youhavetopreciselyunderstandthechemicalprocessesinvolvedandparticipateinacomplicatedway. Stillresearchersarehopeful.InfactSpadiutsaidheisconfidentintheproduct'sdevelopmentprocessandresultsWehavenowdevelopedaprocessthatcanbeeasilyreproducedcanbescaleduptoindustrialapplicationanddeliversaverygoodyieldofthedesiredproduct. Assuchresearchersbelievetheproductwillbeavailableasearlyas2021. 1WhatmaycauseCeliadiseaseaccordingtotheresearch? A.Immunedisorder. B.Dietvariety. C.Livingconditions. D.Bodyproblems. 2Whyisthenewdrugeffective? A.Becauseitchangesone'simmunesystem. B.Becauseitmakestheirritantdonoharm. C.Becauseitattacksonesimmunesystem. D.Becauseitmakestheimmunesystempowerful. 3HowdoesOliverSpadiutexplaintheworkofthenewdrug? A.Bycomparingitwithourbodies. B.Bydescribingitschemicalprocess. C.Bydefininganordinarybacterium. D.Bycommentingontheresearchgroup. 4What'sOliverSpadiut'sattitudetothedevelopmentofthenewdrug? A.Objective. B.Doubtful. C.Uncertain. D.Optimistic.
铁元素是人体不可缺少的微量元素. 1基态铁原子价电子排布式为. 2KSCN可用于Fe3+的检验其对应的硫氰酸分子H﹣S﹣C≡N中σ键和π键之比为C原子的杂化方式为. K3FeCN6可用于Fe2+的检验其阴离子的配体是. 3不锈钢常含有铬Cr和镍元素. ①第一电离能的大小FeCr填“>”“<”或“=”. ②已知Ni2+和Fe2+的离子半径分别为69pm和78pm根据岩浆晶出规则岩浆冷却过程中NiO和FeO中先结晶的是原因是. 4铁镁合金是目前已发现的储氢密度最高的储氢材料之一其晶胞结构如图所示. ①距离Mg原子最近的Fe原子个数是. ②若该晶体储氢时H2分子在晶胞的体心和棱心位置则含Mg96g的该储氢合金可储存标准状况下H2的体积约为L.
设NA为阿伏加德罗常数的值.已知C2H4和C3H6的混合物的质量为14g有关该混合物的说法错误的是
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词符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下面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. WhenIwasveryyoungIstayedatmyhometownwithmygrandma.Shewasadiligentwoman.Shelikestogrowvegetablesortakescareofallthehouseworks.Thoughmyparentsoftenaskhertoquittheworkmygrandmaneverlisten.Shetakesthatshedoesashergreatjoy.IunderstandherbecauseIseehersmileandsatisfiedwithlife.Severalmonthsbeforemyfatherboughtforheranewsmartphone.AndduringtheSpringFestivalIinstructedheronhowemailandusetheInternet.AsidefromemailingshethinksitfeelsgreatlytotalktotheirgrandchildrenonWeChat.
Aquickreviewofsuccessesandfailuresattheendofyearwillhelpyouryearahead. A.shape B.switch C.stretch D.sharpen
1.Whereasthenorthernhemisphereisinthemiddleofwinteraustraliansarebakinginsummerheat.ItisnotunusualtohaveChristmasDaywellintothemid30degreesCelsiusornear100degreesFahrenheit. Atraditionalmealincludesaturkeydinnerwithhamandpork.AflamingChristmasplumpuddingisaddedfordessert.IntheAustraliangoldrushesChristmaspuddingsoftencontainedagoldnugget金块.Todayasmallfavourisbakedinside2Anothertreatismincepies. SomeAustraliansandparticularlytouristsoftenhavetheirChristmasdinneratmiddayonalocalbeachBondiBeachinSydney'seasternsuburbsattractsthousandsofpeopleonChristmasDay.3Iftheyareathomethedayispunctuatedbyswimminginapoolplayingcricketoutthebackyardandotheroutdooractivities. 4CarolsbyCandlelightisheldeveryyearonChristmasEvewheretensofthousandsofpeoplegatherinthecityofMelbournetosingtheirfavouriteChristmassongs.Theeveningislitbyasmanycandlesaspeoplesingingunderacleancutnightsky.5SydneyandtheothercitiesalsoenjoycarolsintheweeksleadinguptoChristmas. A.Oneyouwillenjoyiscoming. B.ChristmasinAustraliaisoftenveryhot. C.WhataChristmaswereallycanhavetogether! D.TheskywithitsSouthernCrossstarsislikeamirror. E.Otherfamiliesenjoytheirdaybyhavingapicnic. F.Whoeverfindsthisknowshe/shewillenjoygoodluck. G.ThewarmweatherallowsAustralianstoenjoyatraditionwhichstartedin1937.
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.
Amaterialcanbereallyspecialwhenitwasnamedaftertheplacewhereit1createoriginally.That'certainlythecase2china.Andofalltypesofchinawhiteporcelain瓷isamongthemostfamous. Nowadaysthe3traditionmaterialhastakenonamodernlookinthe4handoffourChineseartistsintheModernWhitePorcelainExhibition.Andthekeywordhereismodern.Oneoftheworks5beaporcelainboat.Butlook6attentiveandyou'11seethattheboat7buildwithporcelainlookslikeatakeoutbox.Insidetheboatisastatueofababy.Thebabystandsforhumansandtheboatis8supportslife.Itsuggestswemayhavedonesomedamageto9environmentandthatwe'retreatinglifelikefastfood. Allthefourartistsgavewhiteporcelainamodemstyleeachin10theyownway.Andthisiswhattheexhibition'sthemecomesfrom.It'sadialoguebetweenthepastandthepresent.
Thereismoreofaconnectionbetweenfoodandculturethanyoumaythink.Onanindividuallevelwegrowupeatingthefoodofourculture.Itbecomesapartofwhoweare.Manyassociatefoodfromourchildhoodwithwarmfeelingsandgoodmemoriesandittiesustoourfamiliesholdingaspecialandpersonalvalueforus.Foodfromourfamilyoftenbecomesthecomfortfoodweseekasadultsintimesoffrustrationandstress. Onalargescaletraditionalfoodisanimportantpartofculture.Italsooperatesasanexpressionofcultureidentity.Immigrantsbringitwherevertheygoanditisasymbolofpridefortheircultureandmeansofcopingwithhomesickness. Manyimmigrantsopentheirownrestaurantsandservetraditionaldishes.Howeverthefooddoesnotremainexactlythesame.Somematerialsneededtomaketraditionaldishesmaynotbereadilyavailablesothetasteandflavorcanbedifferentfromwhattheywouldprepareintheirhomecountries.Additionallyimmigrantsdonotonlyselldishestopeoplefromthesamecountriesasthembuttopeoplefromdifferentcountries.Thereforetheyhavetomakesmallchangesabouttheoriginaldishestocatertoawiderrangeofcustomers.Thosechangescancreatenewflavorsthatstillkeeptheculturalsignificanceofthedishes. Weshouldembraceourheritage传统throughourculture'sfoodbutalsobecomemoreinformedaboutotherculturesbytryingtheirfood.Itisimportanttorememberthateachdishhasaspecialplaceintheculturetowhichitbelongsandisspecialtothosewhoprepareit.Foodisawindowintocultureanditshouldbetreatedassuch. 1What'sthefunctionoffoodmentionedinthearticle? A.Tohelpmotivatehomesickness. B.Toshownationalidentity. C.Toreflectacountry'shistory. D.Toshowacommunity'ssuperiority. 2WhatdoestheunderlineditinParagraph2referto? A.Thespecifictraditionalfood. B.Thenationalculture. C.Atraditionalexpressionoffood. D.Theold-fashionedtaste. 3Whydosomeimmigrantshavetochangetheoriginaldishesintheirrestaurant? A.Toattachculturalimportancetotheirdishes. B.Toannouncethebeginningoftheirlifeonforeignsoil. C.Tomakethedishespopularamongcustomers. D.Topresenttheirownfoodcultureinanewway. 4What'stheauthor'sattitudetowardsdifferentfoodcultures? A.Negative. B.Balanced. C.Unfair. D.Unchangeable.
SydneyStreetArtWalkingTour Youcangetamuchricherexperiencebytakinga2-hourwalkingtourinthecompanyofartistsanddesignerswhocanexplainthestoriesbehindthework.WanderthroughthestreetsofSydneyanddiscoveritsrichcultureofgraffitimuralismandtaggingwhilelearningabouttheartists.Meetandgetinsightfromlocalcharactersandtoasttheexperiencewithanincludedcraftbeer. SydneyBondiBeachWalkingTour ExperiencethesunsandandsurfatAustralia'smostpopularbeachwiththis1.5-hourwalkingtourofBondiBeach.SeewherethefamousBondiRescueTVshowisfilmedandlearnhowBondiBeachbecameahotspotfortouristssurfersandfamouspeople.AlongthewayadmiretheBondiAboriginalrockartsitesposeforphotosbytheBondiPavilion. SydneyVividLightWalkingTour MakethemostofVividLightSydney'sspectacularlightfestivalwiththissmallgroupwalkingtour.Overthecourseof2hoursyourlocalguidewillleadyouthroughthecity'sopen-airgalleryoflightequipmentstoppingatcelebratedworks.LearnabouttherichpastsofCircularQuayandTheRocksasyoumakeyourwaythroughthesehistoricneighborhoods. OperaHouseGuidedBackstageTour GetauniqueexperienceofOperaHouseonabackstagetourfortheperformingarts.Yourguidesharesstoriesaboutthereal-lifedramasbehindthecurtainandwell-knownhistory.Gobehindthescenestoseepartsoftheoperahousenormallyreservedforstaffandperformers.WrapupthisfascinatingmorningtourbysittingdownwithyourcompanionsforafullAustralianbreakfastintheGreenRoomwhereperformersrelaxbeforegoingonstage. 1Whocanhelpyouifyouwanttoappreciatethestreetart? A.Yourguide. B.Localpeople. C.Artistsanddesigners. D.Artstudents. 2WhatcanyoudoontheOperaHouseGuidedBackstageTour? A.Enjoyinterestingstories. B.Admiretherockartsites. C.WatchthefamousTVshow. D.Meetwell-knownperformers. 3Whichtourisbetterexperiencedduringthenight? A.SydneyStreetArtWalkingTour. B.SydneyBondiBeachWalkingTour. C.SydneyVividLightWalkingTour. D.OperaHouseGuidedBackstageTour.
WhilevisitingtheNorthpoleinwintermaynotbeatthetopofyourbucketlisttheever﹣changingICEHOTELwhichopeneditsdoorstovisitorsonDecember14thisyearmaychangeyourmind.200kmnorthoftheArcticCircleintheSwedishvillageofJukkasjārvithehotelwhichiscarvedentirelyfromiceisrebuiltannually. The35roomsbuilttoaccommodatevisitorsonallkindsofbudgetsvaryfromexpensivesuitestobasicroomsthatarefurnishedwithjustanicybedandareindeerskin.AmongthehighlightsthisyearistheSpruceWoodssuite.SculptedbyChristopherPascoeandJennieO'KeefeofCanadaitdescribesacampingscenecompletewithaclassicmicrobusaforestandevenanartificialcampfire. Thereisalsotheartfully﹣carvedLivingOceansuitetoremindvisitorsoftheimportanceofsavingouroceans.Theroomisfullofcarvedsealifethatincludescoralandasharkswimmingrightovertheicebed.Thesuiteisinspiredbyglobalwarmingandtheoverfishingthataffectsouroceans.saysartistJonathanPaulGreen.IalsothinktheideaofusingfrozenwaterfromariverinnorthernSwedentocreateanoceanwithshellsfishandcoralsisexciting. ThenearbyHavensuiteisamagicalgateoficeguardedbytwolargeanimals.WeareinspiredbythemeetingbetweenpeopleandwanttocreateanexperiencethatinvitescuriosityandcreativitysaysartistJonasJohansson.Itfeelslikeadreamtogettoworkwithicethatallowsourloveforlightshineandreflectiontowanderfreelyfromthoughttocreation. Regardlessofwhethervisitorsselectthecarvedsuitesorthebasiciceroomsthetemperatureisalwayssettoabone﹣chilling﹣5℃!Thatiswhyguestsareadvisedtosnuggle蜷缩upinsidesleepingbagsandwearglovesandwinterhatsallnight.Notsurprisinglymostendupspendingjustasinglenightatthisuniquehotelbeforemovingontotheconventionalandwarmerhotelsnearby. 1Whatdoestheunderlinedphrasebucketlistmeaninthetext? A.Ashoppinglistofbuckets. B.Alistoftravellingdestinations. C.Alistofexpensivehotels. D.Alistofexcitingideas. 2Whatcanweknowabouttheicehotel? A.Itisrebuilteveryyear. B.Itsroomsareexpensive. C.Itorganizescampingactivities. D.Itliesinacoastalcity. 3WheredoestheinspirationofLivingOceansuitecomefrom? A.Artandliterature. B.Oceanlifeandvoyage. C.Climatechangesandhumaninfluence. D.Themeetingofpeople. 4Whichofthefollowingisthebesttitleforthetext? A.AnAdventuretotheNorthPole B.AnExperienceClosetoNature C.ATasteofColdANightinaVillage D.AWinterDestinationSweden'sIceHotel
OnDec.6KelseyZwickboardedFlight588fromOrlandotoPhillywithLucyoneofher11-month-oldtwindaughters.Lucywasborn11weeksprematurely早产and1fromseverelungdiseaseasaresultofacomplication并发症ofthat.Thebravebabygirlwasonoxygen2untilrecently.TodayLucyneedsoxygenatnightandwhile3onesmallgooddeedremindedZwickhow4sheandherhusbandYuritrulyare. Tothe5in2D.Idon'tknowyoubutIimagineyousawus6.Iwaspushingastroller婴儿车hadadiaper尿布bagonmyarmandalso7anoxygenmachineformydaughterZwickwroteonherFacebookpost.We8theplanesatdowninourwindowseatandmade9tothosearoundusabouthavingtositbymyyelling-but-happybaby.Theflightattendantcameoverandtoldmeagentlemanwaswaitingto10seatsshewrote.Youweregivingupyourcomfortablefirst-classseattous.Notableto11tearsIcriedmywayupthe12whilemydaughterLucy13!Shefeltitinherbonestoo…realpuregoodness.Ismiledandthankedyouasweswitchedbutdidn'tgetto14youproperlythemomcontinued. So…thankyou.Notjustfortheseatitselfbutfor15.Forseeingusandrealizingthatmaybethingsarenot16easy.Fordecidingyouwantedtoshowarandomactof17tous.Ican'twaittotellLucysomeday.Inthemeantime…wewillpayit18. Zwick'sstorytouchedtheheartsofmanygivingriseto19commentsonthepostthathassincebeen20over164000times. 1A.recovers B.suffers C.results D.benefits 2A.test B.health C.survival D.support 3A.playing B.flying C.sleeping D.growing 4A.astonished B.amused C.blessed D.anxious 5A.man B.attendant C.assistant D.guide 6A.somewhere B.anywhere C.nowhere D.everywhere 7A.filling B.pumping C.following D.dragging 8A.booked B.reserved C.pre-boarded D.quit 9A.complaints B.comments C.offers D.jokes 10A.choose B.switch C.accept D.occupy 11A.burstinto B.giveback C.holdback D.breakinto 12A.passage B.airport C.flight D.pilot 13A.shouted B.crawled C.talked D.laughed 14A.meet B.thank C.recognise D.accept 15A.noticing B.donating C.reminding D.forgiving 16A.just B.right C.always D.ever 17A.forgiveness B.advantage C.kindness D.donation 18A.forward B.downward C.backward D.toward 19A.passive B.supportive C.possible D.negative 20A.made B.chosen C.researched D.shared
IjustcountedhowmanyforeignlanguagesI'vestudiedsofarinmylifeandit'sbeentwelve! IalwaysfollowmyinterestsandfindwaystoputmylanguagelearningintothingsI'malreadyinterestedin.Iliketoreadblogs博客inotherlanguages.1.ForthemostpartbloggerstendtowritethesamewaytheyspeaksoIdon'thavetoworrymuchaboutadoptingstrangetermsthatareonlyusedinwriting. Moviesarealsoareallygoodtoolespeciallyifyoucanfindsubtitlesinthelanguageyou'relearning.2theywillstillkeepyourbrainlisteningandreadinginthesamelanguage.Musicisanotherwaytostartlisteningtothingsinyournewlanguage.PersonallyI'msobadatunderstandinglyrics歌词eveninEnglishsothisonedoesn'treallyworkformebutIhavefriendswholearnalanguagethroughlyrics.Gamesareofcoursealsoanexcellentwayofstudyinganewlanguage.Alotoflanguagelearningcomputerprogramsincludegames.I'msupercompetitiveandifIplayanyofthemIcanbehookedforhours.3. Whentheinitialexcitementoflearninganewlanguagebeginstofadeitcanbehardtostickwithit.ThehardestbitformeiswhenI'mcomfortableenoughwithalanguagetounderstandmostthingsandmakemyselfunderstood.I'mactuallystuckatthisstageinNorwegian.4.IdeallyIshouldsignuptotakeabiglanguageexam.EachtimeIstartgettingself﹣satisfiedit'stimetotakeanewcourseorsignupforonlinelessonsortakeupsomesortofchallengethatwillrequiremetolevelupmyskills. 5.ThebestlanguageclassI'veevertakenwasmybeginner'sRussiancourseatuniversitywheremyprofessorneverusedanyEnglish.ItgottothepointwhereIwouldkindofjustforgetaboutEnglishwhileinRussianclasswhichhelpedmetoreallyimmersemyselfintheRussianlanguageanddoawholelotwiththelimitedRussianIhad. A.That'sreallyuncomfortable B.Whateverlanguagesthey'retranslatedinto C.IalsotrytothinkinthelanguageI'mlearning D.It'stimewellspentifI'mlearningthelanguage E.Computergamesalwaysmakemefeelwornout F.Thoughtheydon'talwaysexactlymatchwhat'sbeingsaid G.Ifoundthemtheperfectlearningtoolbecausethey'reusuallywritteninorallanguage
AwomangraspedherphonetoherheartthewayaministermightholdaBible.Shewasanxioustotakeapictureofabunchofflowersthatsatnot10feetawaybutfirstshehadtogetthroughacrowdofotherspushingtodothesame.ThecauseofthiswasBouquetstoArtoneofthemostpopularannualeventsatthedeYoungMuseuminSanFrancisco.Forthe34thyearartistswereaskedtocreateflowerbunchesthatrespondtopiecesofartondisplayfromancientcarvingstocontemporarysculptures.It'stimetotakeaphototopostonInstagrambuttothepointthatithasbecomeaproblem. InrecentyearsthedeYoungreceivedmorethanathousandcomplaintsfrompeoplewhofeltthatcellphoneshadruinedtheirexperience.Infactinstitutionsoffineartaroundtheworldfacesimilarproblemsasthedesiretotakephotographsbecomesahugedrawformuseumsaswellassomethingthatupsetssomeoftheirvisitors.SothedeYoungrespondedwithakindofcompromisecarvingoutphotofreehoursduringtheexhibition'ssix-dayrun. Onecommoncomplaintintheongoingdebatesovertheeffectofsocialmediaonmuseumcultureisthatpeopleseemtobemissingoutonexperiencesbecausetheyaresobusycollectingevidenceofthem.ArecentstudyinthejournalPsychologicalSciencesuggeststhereissometruthtothisitfoundthatpeoplewhotookphotosofanexhibitratherthansimplyobservingithadahardertimerememberingwhattheysaw.Buttheissueiscomplicatedfortheprofessionalsrunningmuseums.LindaButlerthedeYoung'sheadofmarketingcommunicationsandvisitorexperienceacknowledgesthatnoteveryonewantsamuseumtobeaphoto-takingplayland.YetalotofotherpeopledoandshethinksthatthedeYoungisinnopositiontojudgethatonemotivationforbuyinga$28ticketismorevalidthananother.Ifweremovedsocialmediaandphotographyshesayswewouldriskbecominglesspopular.Ifthisisabattlesignsindicatethatthepro-phonecrowd亲手机人群hasalreadywon. 1WhatwerethecrowdeagertodoinParagraph1? A.ToholdaBible. B.Toadmireflowers. C.Totakeaphoto. D.Toseetheexhibition. 2HowdidthedeYoungrespondtothecomplaints? A.Bysettingperiodswithoutphoto-taking. B.Bymakingtheexhibitionfreeofcharge. C.Bycompromisingwithotherinstitutions. D.Bygivingextratimetotakephotosfreely. 3Whatcanweinferabouttheuseofsocialmediainmuseumsaccordingtotherecentstudy? A.Ituncoversthetruth. B.Itaccumulatesevidence. C.Itcausescomplaints. D.Itplaysanegativerole. 4WhichofthefollowingmayLindaButlersupport? A.Cateringtovisitors. B.Reducingadmissionprices. C.Reservingjudgementinpublic. D.Banningsocialmediaandphotography.
Sincevacationseasonisoverit'stimetostartthinkingaboutwaystoimproveyourtravelliteracy-yourabilitytogetaroundwithoutlookinglikeafoolishtourist-beforeyournexttrip. Readabook. Therighttravelbookcaneducateandinspire.GoodwritinghelpsmetolookatmysurroundingswithneweyessaysMarthaMerrittdeanofinternationaleducationattheUniversityofRichmond.Abookabouttravelisnotnecessarilyatravelguidebook.Itcansimplybeabook-fictionornonfiction-aboutaplace. Findyourattractivegrouponsocialmedia. That'swhatTiffanyBurnettewhorunsadesigncompanyinPhiladelphiadoesbetweentrips.ShespendstimeonFacebook'stravelgroupsconnectingwithnewfriendsandlearningnewtravelskills. Learnalanguage. Ispend15to20minuteseachdayworkingonmybasiclanguageskillssothatIcanatleastshowrespectsaysJeffWilsonthehostofRealRailAdventuresonPBSPhraseslike‘please'‘thankyou'countingandaskingbasictravelquestions.MichelleWilliamswhohastraveledtomorethan50countriessaysAnapplikeDuolingoisagreatwaytoimproveyourlanguageskillsbeforeyoutravel. Whilethesetoolscouldmakeyouasmartertraveleronlyonethingisguaranteedtoimproveyourtravelliteracy.Youhavetogetoutofyourseat.YoucanstartyourjourneybyvisitingyourtravelagentfromtheUnitedStatesTourOperators. 1Whatcanyouimproveafteryoureadthepassage? A.Waysofthinking. B.Abilitytoread. C.Abilitytotravel. D.Waysoflearning. 2HowdoesTiffanyBurnettelearnnewtravelskills? A.Byreadingtravelbooks. B.Byconnectingwithtravelgroups. C.Byworkingonlanguages. D.Byrunningatravelcompany. 3Whowouldliketolearnlanguageswithanapp? A.MarthaMerritt. B.TiffanyBurnette. C.JeffWilson. D.MichelleWilliams.
热门题库
更多
高三下学期数学
高三上学期数学
高一下学期英语
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