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空间直角坐标系o﹣xyz中,有四个点,A(1,0,0),B(0,1,0),C(0,0,1),D(3,4,5),则D到平面ABC的距离为( )
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高二上学期数学《》真题及答案
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在空间直角坐标系Oxyz中有一四面体C.-AOBC.
O.、
为四面体的四个顶点,且坐标为O.(0,0,0)、A.(L.,0,0)、B.(0,L.,0)、
(0,0,L.)。
(2L.,0,0)是x轴上一点,在坐标原点O.处固定着+Q.的点电荷,下列说法正确的是( )
A.A.B.C.三点的电场强度相同 B.电势差U.
OA
=U.
AD
C.将一电子由D.点分别移到A.B.C.三点,电场力做功相同 D.电子在A.点的电势能大于在D.点的电势能
在空间直角坐标系O.-xyz中平面OAB的一个法向量为n=2-21已知点P.-132则点P.到平面O
在空间直角坐标系Oxyz中有一四面体C.-AOBC.
O.、
为四面体的四个顶点,且坐标为O.(0,0,0)、A.(L.,0,0)、B.(0,L.,0)、
(0,0,L.)。
(2L.,0,0)是x轴上一点,在坐标原点O.处固定着+Q.的点电荷,下列说法正确的是( )
A.A.B.C.三点的电场强度相同 B.电势差U.
OA
=U.
AD
C.将一电子由D.点分别移到A.B.C.三点,电场力做功相同 D.电子在A.点的电势能大于在D.点的电势能
空间直角坐标系O﹣xyz中两点A112B﹣103的距离|AB|=.
已知直角坐标系内有四个点O.00A.30B.11C.x1若以O.A.B.C.为顶点的四边形是平行四边
下列叙述中正确的个数是①在空间直角坐标系中在Ox轴上的点的坐标一定是0bc②在空间直角坐标系中在yO
1
2
3
4
有下列叙述①在空间直角坐标系中在x轴上的点的坐标一定可记为0bc②在空间直角坐标系中在y轴上的点的坐
已知直角坐标系内有四个点O.00A.30B.11C.x1若以O.A.B.C.为顶点的四边形是平行四边
在空间直角坐标系中点M.02﹣1和点N.﹣110的距离是.
在如图所示的空间直角坐标系O﹣xyz中一个四面体的顶点坐标分别为002220121222给出的编号
①和②
③和①
④和③
④和②
已知空间直角坐标系O﹣xyz中正四面体P﹣ABC的棱长为2点Am00B0n0mn≠0则|OP|的取
已知空间直角坐标系O﹣xyz中ABC三点坐标分别为002220﹣2﹣4﹣2点P在xOy平面上且PA
在空间直角坐标系O.-xyz中平面OAB的一个法向量为n=2-21已知点P.-132则点P.到平面O
已知直角坐标系内有四个点O.00A.30B.11C.x1若以O.A.B.C.为顶点的四边形是平行四边
在如图所示的空间直角坐标系O﹣xyz中一个四面体的顶点坐标分别为002220121222给出的编号为
①和②
③和①
④和③
④和②
在如图11所示的空间直角坐标系O.xyz中一个四面体的顶点坐标分别是002220121222.给
①和②
①和③
③和②
④和②
在一空间直角坐标系Oxyz中有一四面体C.-AOBC.
O.、
为四面体的四个顶点,且O(0,0,0)、A.(L,0,0)、B.(0,L,0)、
(0,0,L),
(2L,0,0)是x轴上一点,在坐标原点O.处固定着+Q的点电荷,下列说法正确的是A.A.B.C.三点的电场强度相同B.电势差U
OA
=U
AD
C. 电子在A.点的电势能大于在D.点的电势能D. 将一电子由C.点分别移动到A.B.两点,电场力做功相同
已知直角坐标系内有四个点O.00A.30B.11C.x1若以O.A.B.C.为顶点的四边形是平行四边
已知点Mabc是空间直角坐标系O﹣xyz中的一点则与点M关于z轴对称的点的坐标是
(a,﹣b,﹣c)
(﹣a,b,﹣c)
(﹣a,﹣b,c)
(﹣a,﹣b,﹣c)
在空间坐标系O﹣xyz中已知点A210则与点A关于原点对称的点B的坐标为
(2,0,1)
(﹣2,﹣1,0)
(2,0,﹣1)
(2,﹣1,0)
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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
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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
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