首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
CD经过∠BCA顶点C的一条直线,CA=CB.E,F分别是直线CD上两点,且∠BEC=∠CFA=∠α.(1)若直线CD经过∠BCA的内部,且E,F在射线CD上,请解决下面两个问题:①如图1,若∠BC...
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
方程2x+3y-1-1=0表示的曲线是
两条直线
两条射线
两条线段
一条直线和一条射线
在平面内下列语句中错误的是[]
垂直于一条直线的垂线只有一条
经过一点有一条且只有一条直线垂直于已知直线
过一条线段的中点且垂直于这线段的直线只有一条
线段的一端到这线段中垂线的距离是这条线段的长度的
.
CD经过∠BCA顶点C的一条直线CA=CB.EF分别是直线CD上两点且∠BEC=∠CFA=α.1若直
如图∠BCA=αCA=CBC.E.F.分别是直线CD上的三点且∠BEC=∠CFA=α.请判断EFBE
如图A.是两条平行直线之间的一定点且点A.到两条平行直线的距离分别为设且顶点B.C.分别在两条平行直
如图已知一条直线经过点A.02点B.10将这条直线向左平移与x轴y轴分别交于点C.点D.若DB=DC
如图已知一条直线经过点A.02点B.10将这条直线向左平移与x轴y轴分别交与点C.点D.若DB=DC
下列说法正确的个数是①直线L.经过C.D两点②点C.点D.在直线L.上③L.是一条直线CD是另一条直
1
2
3
0
牙体长轴是指
经过牙冠与牙根中心的一条假想直线
经过牙冠与牙根中心的一条直线,该直线与水平面成垂直关系
平分牙体为左右两等分的一条线
贯穿牙体中心的一条线
贯穿牙冠与牙根中心的一条线
CD经过∠BCA顶点C的一条直线CA=CB.EF分别是直线CD上两点且∠BEC=∠CFA=∠α.1若
如图已知一条直线经过点A.02点B.10将这条直线向左平移与x轴y轴分别交于点C.D.若DB=DC求
CD经过∠BCA顶点C的一条直线CA=CB.EF分别是直线CD上两点且∠BEC=∠CFA=∠α.1若
CD经过∠BCA顶点C.的一条直线CA=CB.E.F.分别是直线CD上两点且∠BEC=∠CFA=∠α
直线CD经过∠BCA顶点C的一条直线CA=CB.EF分别是直线CD上的点且∠BEC=∠CFA=α.1
CD是经过∠BCA顶点C的一条直线CA=CB.EF分别是直线CD上两点∠BEC=∠CFA=α.1若直
直线CD经过∠BCA顶点C的一条直线CA=CB.EF分别是直线CD上的点且∠BEC=∠CFA=α.1
6.00分如图某水平地面上建筑物的高度为AB在点D和点F处分别竖立高是2米的标杆CD和EF两标杆相
已知CD是经过∠BCA顶点C的一条直线CA=CBEF分别是直线CD上两点且∠BEC=∠CFA=α.1
CD经过∠BCA顶点C的一条直线CA=CB.EF分别是直线CD上两点且∠BEC=∠CFA=∠α.
如图已知所以与重合其理由是
两点确定一条直线
在同一平面内,经过一点有且只有一条直线与已知直线垂直
在同一平面内,过一点只能作一条垂线
垂线段最短
热门试题
更多
一Look!Thatteacherisexplainingsomethingtoherstudentsagainandagain! 一teachersheis! A.Howpatient B.Whatpatient C.Howapatient D.Whatapatient
﹣WhatdoyouthinkofKungFuShaolintonight? ﹣Great!I'veneverseenliveshowbefore. A.awonderful B.morewonderful C.mostwonderful D.amorewonderful
AMorning!WhatcanIdoforyou? BWe'dliketogoonatripthisweekendplease. ATherearemanyshorttripsavailable.1? BWe'dliketogototheYuntaiMountain. AItisworthvisiting.2? BWe'renotsure.Whichhoteldoyouthinkwouldbecomfortable? ATheHolidayHomeisverygood.What'smoreimportant3. BWedon'twanttostayinanexpensivehotelsothat'sexactlywhatwewant. A4? BOK.Mywifewillfillintheform.Bythewayisitallrightifwepaybycreditcard? AOfcourse.5! BThankyou. 1. 2. 3. 4. 5.
IhaveEuropeanpenfriendandhelikesplayingguitar.A.an/ B.anthe C.a/ D.athe
SeveralyearsagoIwasatatrainstationinAmsterdam.Isawayounghomelessman26peopleformoneysohecouldbuybreakfast.Mostofthe27simplytooknonoticeoftheyoungmanorgavehimadirtylook.Therewasoneexception例外thoughanolderwell﹣dressedlady.Whentheyounghomelessmanmoved28thiselegantladysheturnedandlookedstraightintohiseyesand29askedHowmuchdoyouneed?Icouldn'thearwhattheyoungmansaidbutwatched30theoldwomanpulledseveralbillsfromherwalletand31themintheyoungman'shands. Idon'tknowwhethertheyoungmanactuallyusedthismoneyforbreakfastorforsomeotherpurpose.WhatIdoknowisthatIsawtwocompletelydifferentreactions反应tothesame32.Isawpeoplewhowereeitherafraidorannoyedordistrustful猜疑的.AndthenIsawthisoldladywho33thehomelessmanasherbrother.Idecidedthenandtherethateventhoughwehavetobe34inthisworldIwouldratherbelikeher. Everydaymaybringusmanychancesfor35.Thekeyistodoitornot. 26.A.asking B.meeting C.giving D.showing 27.A.guests B.audience C.neighbours D.travelers 28.A.from B.after C.before D.over 29.A.softly B.sadly C.loudly D.hopefully 30.A.because B.unless C.as D.although 31.A.checked B.put C.covered D.threw 32.A.location地点 B.survey C.situation D.programme 33.A.ordered B.treated C.introduced D.visited 34.A.famous B.creative C.careful D.successful 35.A.richness B.happiness C.fitness D.kindness.
TimBerners﹣Leeisnotthemostfamousinventorintheworld.Howeverhisinventionhaschangedourlives. HewasborninLondonEnglandin1955.WhenhewasasmallboyTimwasinterestedinplayingwithelectricalthings.HestudiedscienceatOxfordUniversity.Hemadehisfirstcomputerfromanoldtelevisionattheageof21. Timstartedworkingonearlycomputers.Atthattimetheyweremuchbiggerthannow.HeworkedinEnglandthenSwitzerland.Timwasreallyinterestedintwothingscomputersandhowthebrainworks.Howcouldthebrainconnectsomanyfactssoquickly?Hehadtoworkwithpeopleallovertheworld.Theysharedinformationaboutcomputers.Itwashardtomanagealltheinformation.Heansweredthesamequestionsagainandagain.Ittookalotoftime.ItwasevendifficultforcomputersinthesameofficeinSwitzerlandtoshareinformation.Timalsoforgotthingseasily.Couldacomputerworklikeabrain?Couldittalktoothercomputers? TherewasanInternetalreadybutitwasdifficulttouse.In1989TimBerners﹣LeeinventedtheWorldWideWebWWWallbyhimself.ThishadaspeciallanguagethathelpedcomputerstalktoeachotherontheInternet.WhenpeoplewantedtoshareinformationwithotherstheyusedtheWorldWideWeb.TheInternetgrewquicklyafterthat. TimBerners﹣Leedoesn'tthinkhedidanythingspecial.HesaysthatalloftheideasabouttheInternetwerealreadythere.Allhedidwastoputthemtogether.HesaysthatmanyotherpeopleworkedtogethertomaketheInternetwhatitistoday. Mostinventorswanttobecomerich.ButTimgaveawaytheWorldWideWebfornothing.HenowworksinAmerica.HehelpspeoplesharetechnologyandwantstheInternettobefreeforeveryonetouse.Maybeheisthemostimportantbutleastfamousinventorintheworldtoday! 1.WhatwasTimBerners﹣Leeinterestedin? A.Lookingforjobsindifferentcities. B.Talkingtopeoplearoundtheworld. C.Studyinghowtoconnectcomputers. D.Exploringhowtoimprovememory. 2.TheunderlinedwordItinParagraph3refersto. A.Workingonearlycomputers B.Connectingdifferentfactstogether C.TravellingtotheofficeinSwitzerland D.Repeatingtheanswerstothesamequestions 3.WhyisTimBerners﹣Leeoneofthemostimportantmenintheworld? A.HemadeinformationsharingontheInternetpossible. B.Hemadethefirstcomputerwhenhewas21yearsold. C.Hehelpedpeopleunderstandbetterhowthebrainworks. D.HeinventedtheInternetandmadeitfreeforeveryonetouse. 4.Inwhatorderdidthefollowingeventstakeplace? a.TimworkedinEngland.b.TimworkedinSwitzerland. c.Timmadehisfirstcomputer.d.TiminventedtheWorldWideWeb. e.TimstudiedscienceatOxfordUniversity. A.c﹣e﹣d﹣a﹣b B.e﹣b﹣a﹣c﹣d C.c﹣d﹣a﹣e﹣b D.e﹣c﹣a﹣b﹣d 5.WhatdoesthewriterthinkofTimBerners﹣Lee? A.Heisnotfamousbecauseheisnotrich. B.Hehaschangedourlivesandheisgreat. C.Hedidnothingspecialbutmakepeopleagoodlife. D.Hehasmadegreatachievementsinmemoryresearch.
Haveyoueverheardthatwecangrowfreshairinourhomewithoutusinganyexpensiveair﹣cleaningmachines?Itbecomestrue.ThestudiesinIndiashowthatpeopleneedonlythreegreenplants.Whatwehavetodoisputtheminspecific特定的spaceofthehouseandeachofthemwilldotheirshare. MeattleanengineerhasfilledhisofficebuildingwithsomeplantsandmadeitthehealthiestbuildinginNewDelhi.Sowhynotputsomeoftheseplantsinyourownhouse?Youwillnotonlygetbetterairbutalsofeelfreshatanymoment. 1.Whatplantmaybeharmfultopeople? A.Tulips. B.Betelpalms. C.Evergreens. D.Moneyplants. 2.WhichofthefollowitTRUE? A.Moneyplantscan'tbeputinthebedroom. B.EvergeenscanchangeCOintoO2atdaytime C.Meattlehasplantedmanytulipsinhisofficebuilding. D.Afamilyofthreeneeds12betelpalmsinthelivingroom. 3.What'sthepassageabout? A.Howtogrowgreenplantsbetter B.howtomaketheofficebuildinghealthier C.Howtogetfreshairthroughproperplants. D.Howtoturnourhomeintoamorebeautifulone.
在每个空白处填上一个适当的句子使对话的意思连贯完整有两项是多余的 AWhat'syourplanforthesummerholiday? BI'llvisitmycousin.1 AIsthefarmbigorsmall? BIt'snotverybigbutit'sreallyaniceone.2 AI'msureyouwillenjoystayingthere.Whatdoeshegrowonthefarm? B2 AWhatareyougoingtodothere? BI'llgothereandhelphimpickfruit. A4Itsoundsfun. BItreallydoes.Andthefruitsareverydelicious. AIenjoythemverymuch.Aretheysoldhere? BOfcourse5.Mycousinwillsendthemtoothercountriessomedaytoo. 1. 2. 3. 4. 5.
Anoldmanwasgoinghomelateonenightwithhishorseandcartafteraday'shardwork.Whenhewasnotfarawayfromhishousethelightonthecartwentout.Hetriedbutcouldnotrepairit.Hewasnearhishomeandsohewentalongtheroadwithoutalight.Whenapolicemansawthishestoppedtheoldman. Whereisyourlight?askedthepoliceman.Nomanmaytakeacartalongtheroadatnightwithoutalight.Youknowthat.Youhavebrokenthelaw.Ihadalightbutithasjustgoneoutsaidtheoldman. Idon'tbelievethatstory.What'syournameandwheredoyoulive?askedthepoliceman.Pleasedon'twritedownmynamesaidtheoldman.Myhomeisjustthere.Youcanseeitfromhere.Ihadalightnearlythewholeway. Youcameallthewaywithoutalight.What'syourname? Theoldmanquicklytookthepoliceman'shandandputitdownonthetopofthelight.Thelightwasstillhotandburntthepoliceman'shand.Thepolicemanjumpedandhewasveryangry.Nowwhatdoyouthink?saidtheoldman.DidIcomeallthewaywithoutalight? 1.Whatdoestheunderlinedwordcartmeaninthepassage? A.Itmeanshouse. B.Itissomethingpulledbyahorse. C.Itmeanslight. D.Itissomethingusedforcookingfood. 2.Theoldmandrovehome. A.lateonenight B.withhisdonkey C.withapoliceman D.earlyonemorning 3.Wheredidthepolicemanstoptheoldman? A.Underastreetlight. B.Atthetrafficlights. C.Neartheoldman'shome. D.Farawayfromtheoldman'shome. 4.Whywastheoldmanstoppedbythepoliceman? A.Becausethelightonhiscartwasnoton. B.Becauseheburntthepoliceman'shand. C.Becausehebrokeastreetlight. D.Becausehedidn'twanttohelpthepoliceman. 5.Whatmadethepolicemanbelievetheoldman'swords? A.Hemadethepolicemanangry. B.Hejumpedandshoutedangrily. C.Thelightburntthepoliceman'shand. D.Hemadethepolicemantouchthecart.
AgroupofboystenandelevenyearsoldwalkintoaclassroomatCollegiateSchool.1Theboysarecuriousabouttheirnewclass.Itiscalledbabies. 2Theyarevolunteers.Thebabiesarenotdolls.Theyarereallivebabies.Theboyslearnhowtofeeddresswashandcarrythem.Theyevenlearnhowtochangediapers尿片andwhattodoinemergencies紧急情况.3Someofthemasktotakeitagain. 4TheboystakerequiredcoursesinmathEnglishsocialstudiesandscience.Theycanalsochooseelectives选修课inweightliftingphotographykiteflyingandcomputerscience.RecentlytheheadmasteratCollegiateSchooldecidedtotrysomethingdifferent.5Intheclasstheboysusedrealbabiestolearnaboutchildcare. Wheredoesthisschoolgetthebabies?Motherintheneighborhoodneartheschoolvolunteertheirbabiesforafewhourseachweek.Thesemotherslikesharingtheirchildrenwithothers. 1. 2. 3. 4. 5.
﹣﹣WangPingcanyoubringyourcellphonetoyourschool? ﹣﹣Actuallynousingcellphonesinmyschoolatanytime. A.doesn'tallow B.isallowed C.aren'tallowed D.isn'tallowed
Timeisaveryvaluablething.Howevermostofusdon't1ituntilit'stoolate.Whenweareyoungwefeelthatwewillnever2time.Wedon'tcountthesecondsminutesandhoursofthedaybecauseweknowthat3willbringmore.Wehavesomuchtimethatwefeelwecaneasily4towastesomeofit.ThinkofthecommonEnglish5wastingtimefillingintimeorevenkillingtime.Wehave6respect尊重fortime. Itisonlywhenget7thatwebegintorealizethattimeisaprecioustreasure.8wemightfindthatwehaven'tinvested投资ourtimewell.Wediscoverthatwe9haveenoughtimetodothingswewant.Justasadultsneedtospendtheirmoneyon10thingsliketaxes税款andbillstheyalsohavetospendtheirtime11thingsthattheymightnotreallywanttodo﹣thingsthatreallymaketimeboring. Theonlywaytogetthemostofthetimewehaveistolivefortodayandneverdelay拖延tillnextday.Astheidiom12Delayisthethiefoftime.Andyoudon'twantanyonetostealyourtimedoyou? 1.A.remind B.realize C.review D.research 2.A.besureabout B.getridof C.bethirstyfor D.runoutof 3.A.tomorrow B.success C.ability D.knowledge 4.A.agree B.avoid C.afford D.advise 5.A.expressions B.instructions C.suggestions D.introductions 6.A.few B.little C.afew D.alittle 7.A.older B.stronger C.busier D.higher 8.A.Simply B.Specially C.Suddenly D.Seriously 9.A.attimes B.nomore C.atleast D.nolonger 10.A.unexpected B.unpleasant C.unforgettable D.unbelievable 11.A.do B.done C.doing D.todo 12.A.writes B.tells C.reads D.says
Ithinkit'sfunmovieIhaveeverseen.
Itisreportedthatalotofadultstakelessonsonlinefurthereducation. A.after B.to C.with D.for
﹣Jackwhichprogramareyouwaitingfor? ﹣EverlastingClassics经典咏流传.Ihereformorethantwentyminutes.Ourteacheraskedustowatchit. A.waited B.wait C.waswaiting D.havewaited
Aroundtheworldthereareabout7000NationalParks.Mostofthemcoverhugeareasoflandwherenobodylives.1theNationalParksinEnglandincludeplaceswherepeopleliveandworkas2aswildareaswheretherearefewhumanactivities. TheNationalParksinEngland3England'sBreathingSpacesbecausetheyareplaceswherepeoplecangotobeintheopenairaway4thedirtandnoiseofcities.Theyprovidewonderfulscenesofmountainswoodsgrasslandsandwetlands.Andtherearelotsofactivities5inalloftheNationalParksinEngland.Visitorscanwalkorridebikesforfun.Manyoftheparksputonactivitiesforfamilies. Everyyearthereareabout110millionvisitorstotheparks6manybenefits益处totheareas.Atthe7timeitcreatesproblemstoo.Firstlifecanbedifficultforlocalpeople.Carparksandroadsaretoocrowded.Giftshopsandcafestaketheplaceofmanyeverydayshops.Evenhousepricesinsomeareascanbecometoo8.Besidescountryroadscanbedamagedfortoomanypeoplewalkcycleorridehorsesonthem.Roadscanberebuiltbutthentheylooklessnatural.Anotherbig9totheNationalParksislitter.Intheparksitisadangertowildanimals.Brokenglasscanalsocausefiresbyfocusingtheraysofthesun.Suchfiresinwildplacescanbe10ofcontrol. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
﹣HebeintheclassroomIthink. ﹣Nohe____beintheclassroom.Isawhimgohomeaminuteago. A.canmaynot B.mustmaynot C.maymustn't D.maycan't
MoreschoolsinLaiwutoprovidechildrenwithbettereducationinafewyears. A.built B.arebuilt C.werebuilt D.willbebuilt
TheTigerMomwentoutofthebedroomleaveherdaughtercryingsadly.
MaryisnowtravellinginAnshunandshetoEnglandintwodays. A.wasback B.willbeback C.isback D.hasbeenback
Asweallknowoftheearthsurfacecoveredbywater. A.threefoursis B.threefourthsare C.threefourthsis D.threefoursare
WilliamBlakedescribedtheeyesasthewindowsofthesoul.Oureyesarethewindowsthroughwhichweseetheworldaroundus.Eitherwaythere'snoquestionthatweplacegreatvalueonoureyesandoureyesight.Surveyshaveshownthatofthefivesensessightistheonethatpeoplefearlosingthemost. Thinkingabouttheimportantfunctionofoureyeswe'dgivethemthebestcarepossiblebutsometimeswegettoobusyorforgettodoafewsimplethingsthatcankeepoureyeshealthy. Protectingyoureyesstartswiththefoodonyourplate.Rememberwhenyouwereakidandyourmomtoldyouthatcarrotswouldimproveyoureyesight.Wellshemightberight.Properfoodwillkeepyoureyesstrongandhealthy. Giveupyourdailyhabitsthatcouldseriouslyinjureyoureyes.AlwayswearsunglassesinasunnydaytoprotectyoureyesfromUltravioletray紫外线.Restyoureyesevery20minutesfromthecomputerscreenbylooking20feetawayfor20seconds.Atleastevery2hoursgetupandtakea15﹣minutebreakwhenworkingatacomputer. Makesureyoureyesdonotgetinjuredinthefirstplace.Youshouldtrytopreventeyeinjurieswhetheryou'replayingsportsordoinghousework.Youshouldalsoknowwhentowearsafetyglassesandwhatkindswillworkbestforyou. Lastbutnotleastgetyoureyesexaminedregularly.Eyeexamscanhelpfindsomeeyediseases.It'simportanttofindthesediseasesearlyonwhenthey'reeasiertotreat. 1.Accordingtoasurveypeoplefearlosingmost. A.theirsights B.theirhearings C.theirsmells D.theirtastes 2.TheunderlinedwordfunctionmightmeaninChinese. A.差异 B.功能 C.优势 D.问题 3.isNOTagoodwaytoprotectyoureyes. A.Eatingcarrots B.Wearingsunglasses C.Workingatcomputers D.Usingsafetyglasses 4.Findingeyediseasesearlyonthrougheyeexams. A.savesmuchworkforthedoctors B.ishelpfulforthetreatment C.providesyouthebestcareofyoureyes D.wastesmuchofyourmoney 5.Whatisthebesttitleofthepassage? A.GiveYourEyesSomeRest B.GoodHabitsBringHealth C.ProtecttheWindowsoftheSoul D.SimpleWayofEyeExamswastesmuchofyourmoney.
请根据所给思维导图和写作要求联系生活实际以MyFamilyLife为题用英语写一篇不少于80个词的短文谈谈你的家庭生活. 写作要求: 1.短文必须包含思维导图中至少三个方面的内容; 2.语句通顺意思连贯语法正确书写规范; 3.文中不得出现真实的人名校名或地名. MyFamilyLife
Mysisterthepianoverywellbutshehasn'thadtimetoplayrecently. A.willplay B.hasplayed C.played D.plays
﹣Howistheyoungman?﹣. A.He'stwenty B.He'smuchbetter C.He'sadoctor D.He'sisSmith
Therearefiftyinourschool.Theyareallfriendlytous. A.womanteachers B.womenteacher C.womanteacher D.womenteachers
Ourschoolbushadtoinfrontofthesupermarketforhoursbecauseofthebadtraffic. A.remind B.remain C.realize D.require
﹣Doyouknowwe'llhavethreedaysoffafterthetestsinMay? ﹣excitingnews! A.Howan B.How C.What D.Whatan
Manypeopleoftenmeetsuchdifficultsituation.It'sthattheydon'tknowthewayinnewplacesandtheyaretooshytoaskpeopleabouttheway.1 FirstlywemustknowsomeimportantandusefulexpressionssuchasCouldyouplease…ExcusemeandThanksalot.ForexamplewhenwewanttoaskstrangersaboutthewaywemustsayExcusemeatfirst.2NextCouldyouplease…isoftenusedwhileaskingforthedirection.3It'salsopolitetoshakehandswiththestrangers. Secondlyweoftenneedtotakesomeusefulthingswithus.Theyusuallyincludepensspecialmapscamerasandsoon.4Wecanwritedownthekeywordsabouttheplaceandthenwecanshowthemtothestrangerswhowewanttoaskforhelp.Ofcoursethecamerascanhelpusfindourcorrectway.5Thenwecanshowthepicturesaboutittothestrangerswhenaskingfordirections. Allaboveispoliteorusefulwaystoaskaboutthecorrectwayorplace. 根据材料内容从下面五个选项中选出能填入文中空缺处的最佳选项使短文意思通顺内容完整. A.Sometimesapencanhelpusgettotherightplace. B.IntheUSApeoplealsouseitinmanydifferentsituations. C.Herearesometipsonhowtoaskaboutthewaypolitely. D.AfterweknowhowtogettothefinalplaceweshouldsayThankstoothers. E.Beforewegotoastrangeplacewecantakesomephotosaboutit. 1. 2. 3. 4. 5.
﹣Doyouhavetoplaythemusicsoloud?I'vegotatesttomorrow! ﹣SorryIyoucouldhearthat. A.don'tknow B.won'tknow C.didn'tknow D.haven'tknown
热门题库
更多
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
高一上学期物理
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库