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已知P为等边三角形所在平面内的一个动点，满足，若，则＝（ ）
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高三下学期数学《》真题及答案
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△ABC中①若AB=BC=CA则△ABC是等边三角形②一个底角为60°的等腰三角形是等边三角形③顶
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下列四个说法中:①三个角都相等的三角形是等边三角形②有两个角等于60°的三角形是等边三角形③有一个角
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在△ABC中①若AB=BC=CA则△ABC为等边三角形②若∠A=∠B=∠C则△ABC为等边三角形③有
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已知等边三角形的边长为4那么这个等边三角形的面积是.
三根火柴可以拼成一个等边三角形用6根火柴拼成四个完全相等的等边三角形9根火柴能拼成7个完全相同的等边
在下列结论中1有一个外角是120°的等腰三角形是等边三角形2有两个外角相等的等腰三角形是等边三角形3
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△ABC中①若AB=BC=CA则△ABC是等边三角形②属于轴对称图形且有一个角为60°的三角形是等边
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关于等边三角形下列说法中错误的是
等边三角形中，各边都相等
等边三角形是特殊的等腰三角形
三个角都等于60°的三角形是等边三角形
有一个角为60°的等腰三角形不是等边三角形
若O.是△ABC所在平面内一点且满足则△ABC一定是
等边三角形
直角三角形
等腰三角形
等腰直角三角形
已知等边三角形ABC的高为4在这个三角形所在的平面内有一点P若点P到AB的距离是1点P到AC的距离是
在等边三角形所在平面内找出一个点使它与三角形中的任意两个顶点所组成的三角形都是等腰三角形这样的点一共
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已知等边三角形ABC的高为4在这个三角形所在的平面内有一点P.若点P.到AB的距离是1点P.到AC的
.一个等边三角形的边长为2则这个等边三角形的面积为
若O是△ABC所在平面内一点且满足则△ABC的形状是
等腰三角形
直角三角形
等腰直角三角形
等边三角形
等边三角形ABCP为等边三角形ABC所在平面上一点△PAB.△PCB与△PAC都是等腰三角形这样的点
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已知等边三角形的边长为3点P为等边三角形内任意一点则点P到三边的距离之和为
点P.是等边三角形ABC所在平面上一点若P.和△ABC的三个顶点所组成的△PAB△PBC△PAC都是
如图在数轴上从原点A开始以AB=1为边长画等边三角形记为第一个等边三角形以BC=2为边长画等边三角
如图在数轴上从原点A开始以AB=1为边长画等边三角形记为第一个等边三角形以BC=2为边长画等边三角
利用复印机的缩放功能将原图中边长为5厘米的一个等边三角形放大成边长为20厘米的等边三角形那么放大前后
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图中能正确表示基因分离定律实质的是
Althoughtheideaofzeroemissionnetcarbon﹣positivesustainable可持续developmentwaspromotedworldwidemostcitiesareatalosswhattodoorevensomehaveobjectedtoit.ButinLiuzhouacityinsouthernChinaattitudescouldnotbemoredifferent. TheLiuzhouMunicipalityUrbanPlanningBureauhassignedupItalianarchitectStefanoBoerithefatheroftheforestcitymovementtobuildaself﹣containedcommunityforupto30000people.Heisthego﹣tomanforsuchprojectsthankstothesuccessofhisverticalforeststworesidential住宅的towers.Completedin2014theyremoveupto17.5tonsofsoot煤烟fromtheaireachyearandayearlateroneofthemwasnamedBestTallBuildingWorldwide. TheLiuzhouprojectisamuchmoreambitiousundertakinghowever.Itshomeshospitalshotelsschoolsandofficeswillbebuiltona340﹣acresiteinwhatBoericallsthefirstattempttocreateanurbanenvironmentthatisreallytryingtofindabalancewithnature.Its100speciesofplantlifeareexpectedtoabsorbalmost10000tonsofcarbondioxideand57tonsofpollutantsperyearwhileatthesametimeproducing900tonsoflife﹣givingoxygen. Althoughthearchitectshaven'tpublishedthecostoftheforestcitytheMilantowerscostonlyfivepercentmorethantraditionalskyscrapers. TheconstructionofhisforestcityatLiuzhouissettobeginin2020andthereisstillagreatdealofplanningandresearchrequiredbeforeaprojectedcompletiondatecanbeset.HoweverBoeriremainsoptimisticabouttheprojectandhasconfidenceinthesoundnessofhisvisionIreallythinkthatbringingforestsintothecityisawaytodealwithglobalwarming. 1What'sLiuzhou'sattitudetowardsthesustainabledevelopment? A.Approving. B.Cautious. C.Unfavorable. D.Doubtful. 2WhyisStefanoemployedfortheLiuZhouproject? A.Hevolunteeredtodotheproject. B.Heisafamousarchitectintheworld. C.Heisthefatheroftheforestrecovery. D.Hehasgainedexperienceinsimilarprojects. 3Whatdoestheunderlinedwordtheyreferto? A.Thearchitects. B.Thetwotowers. C.Forestsinthecity. D.Theresidentsofthecity. 4What'sthepurposeofLiuZhouproject? A.Toprovidemorejobs. B.Tobringforestintocity. C.Tosolvehouseshortage. D.Toimprovetheenvironment.
酵母菌进行有氧呼吸和无氧呼吸的共同终产物是
Asafirstresponderyouneverknowwhattypeofsituationyoumightwalkintoorwhoyou'llmeetalongtheway.That'sdefinitelybeenthecaseforJeffreyLanenberga51﹣year﹣oldparamedic急救医务人员since1984. TenyearsintothejobLanenbergreceivedacallthatreportedthatamaninhisearly30shadfallendownintheMallofAmerica.WhenLanenbergandhispartnerarrivedatthescenetheyfoundtheyoungmalefacedownontheground.Hehadgoneunconsciousmakingweakattemptstobreathe.Hiswifestoodbesidehimholdingtheirsmallsoninhorror.Theyquicklyrushedtodefibrillate除颤andcalmthemantokeephimundercontrol.AfterLanenbergdroppedthepatientoffattheneighboringhospitalhethoughtaboutthemanandhisfamilyforalongtime. LanenbergthoughthehadexperiencedeverythingunderthesununtilonerandomvisittoOfficeMaxthreeyearsagowherehemetamanrepeatedlywalkbackandforthwhilestaringathim.Asitturnedoutthemanwasthepatienthehadsaved20yearsearlier. Yougaveme20yearsmorethanIeverthoughtI'dhavethemansaid.HethankedLanenbergrepeatedlyandtoldhimhehadsomeonehewantedhimtomeet.Hesteppedaroundthecornerandreappearedwitha20﹣something﹣year﹣oldman.Lanenberginstantlyknewthatitwasthesonhehadseenstandingbyhismotherallthoseyearsago. ThatdaychangedmylifeLanenbergsaid.Beforethateverythingwasaboutwork…WhenItalktomybeginner﹣trainingclassItellthemyouneverknowtheimpactyoucanhaveonsomeone'slife. 1WhatdidLanenbergdowiththeyoungman? A.Hegavethemanthefirstaid. B.Hecuredthemanatthescene. C.Heonlysentthemantohospital. D.Hetookcareoftheman'swifeandson. 2WhatdidLanenbergthinkoftheencounterwiththeman? A.Itwasunbelievable. B.Itwasacommonroutine. C.Itwasamatterofcourse. D.Itwasadangeroussituation. 3WhywasthemanthankfultoLanenberg? A.Lanenberghelpedbringuphislittleson. B.Lanenbergdonatedtosupporthisfamily. C.Lanenberggavehimthepresenthappylife. D.Lanenbergtaughthissontobeanewdoctor. 4HowdidthemeetingchangeLanenberg'slife? A.Hechangedhisattitudetohisjob. B.Hewasrewardedwithmuchmoney. C.Hegotapromotiontobeateamleader. D.Hetookupteachingworktotrainnewcomers.
LastweekVodafonestartedatestoftheUK'sfirstfull5GserviceavailableforusebybusinessesinSalford.ItispartofitsplantotrialthetechnologyinsevenUKcities.Butwhatcanweexpectfromthenextgenerationofmobiletechnology? Onethingwewillseeinthepreparationforthetestislotsoftrickswiththenewtech.Earlierthisyearoperatorspaidalmost£1.4billionforthe5Gwavelengthsandtocompensateforthatcashtheywillneedtocatchtheeyeofconsumers.InSeptemberVodafoneuseditsbitoftherangetodisplaytheUK'sfirsthologram全息call.TheManchesterCitycaptainStephHoughtonappearedasaholograminNewbury.Itisn'tallhologramshowever5Gwillofferfasterinternetaccess.withOfcom英国通讯管理局suggestingthatvideothattakesaminutetodownloadon4Gwillbeavailableinjustasecond. Thewiderapplicationistosupportconnectedequipmentontheinternetofthings﹣notjusttheinternet﹣enabledfridgethatcanreorderyourmilkforyoubutthenetworkthatwillenabledriverlesscarsanddeliverydrones无人机tocommunicatewitheachother. ProfWilliamWebbhaswarnedthatthetechnologycouldbeacaseoftheemperor'snewclothes.Muchofthespeedincreaseheclaimscouldhavebeenachievedbyputtingmoremoneyinthe4Gnetworkratherthananewtechnology.OtherdifferentvoiceshavesuggestedthatafocusonrollingoutwiderruralbroadbandaccessandaddressingcurrentnetworkcoveragewouldbemorebeneficialtotheUKasawhole. Obviously5Gwillalsobringacosttoconsumers.Itrequiresahandsetforboth5Gand4Gandthefirst5G﹣enabledsmartphonesareexpectedinthecomingyear.Withtheslowpaceofnetworkrolloutsofaritislikelythatconsumerswillendupupgradingtoanew5Gphonewellbefore5Gbecomeswidelyavailableinthenextcoupleofyears. 1WhydoesProfWilliamWebbsaythetechnologycouldbeacaseoftheemperor'snewclothes? A.Heisinfavoroftheapplicationofthenewtechnology. B.5Gwillbringacosttoconsumersintheirdailylife. C.5Ghelpspeoplecommunicatebetterwitheachother. D.Heprefersmoremoneytobespenton4Gnetworks. 2Theunderlinedwordaddressinginthefourthparagraphhastheclosestmeaningto. A.makingaspeechto B.tryingtosolve C.managingtodecrease D.respondingto 3Thelastparagraphindicatesthat. A.it'lltakeseveralyearstomake5GaccessibletothepublicintheUK B.5Gserviceshowshugedevelopmentpotentialandabroadmarket C.customersareeagertouse5Gsmartphonesinsteadof4Gones D.it'sprobablethat5GnetworkrolloutisspeedingupinBritain 4Whatdoweknowaboutthetext? A.Vodafoneissuccessfulinspreadingthe5Gservice. B.StephHoughtonappearedasahologramby4G. C.Theapplicationof5Gwillmakelifemucheasier. D.5GphonesareavailableinruralareasoftheUK.
如图所示的电路中电源电压保持不变R2＝20Ω闭合开关S移动滑动变阻器R2的滑片到中点c时电流表的示数为0.4A移动滑片P到最左端a时电流表的示数为0.3A求电源电压和R1的阻值．
下列关于细胞分裂分化衰老和凋亡的叙述中正确的是
在豌豆杂交实验中为防止自花传粉应
下列各项应用中主要是利用细胞呼吸原理的是 ①手指受伤时选择透气的消毒纱布包扎 ②稻田定期排水有利根的生长 ③利用葡萄粮食和酵母菌制酒 ④大棚种植用无色透明薄膜
下面是光合作用过程示意图请回答问题． 1光合作用包括两个阶段其中E是在叶绿体的进行该阶段需要D阶段提供的物质是． 2叶绿体的色素分布在．图中A是． 3光合作用发生的部位是． A．叶绿素B．叶绿体C．叶绿体的基粒D．叶绿体的基质
一般情况下活细胞中含量最多的化合物是
下列群落演替的实例中属于初生演替的是
决定自然界中生物多样性和特异性的根本原因是生物体内
下列关于现代生物进化理论的叙述正确的是
September222018willbeWorldCar﹣FreeDayadayonwhichpeopleacrosstheglobeareencouragedtofind1methodstomeettheirtransportationneedsandre﹣discoverbusesbikesandtheirown2. Onthisdaypeoplegettogetherinthestreetsintersectionsandneighborhoodblocksto3theworldthatwedon'thavetoacceptourcar﹣controlledsociety. While4alongtheselineshadtakenplacefromtimetotimestarting5the1973oilcrisisitwasonlyinOctober19946astructuredcallforsuchprojectswas7inakeynotespeechbyEricBrittonattheInternationalAccessibleCitiesConferenceheldinToledoSpain. ThefirstnationalcampaignwaslaunchedinBritainin1997andtheFrenchfollowedsuitin1998.In2000carBustersissuedanopen8foraWorldCar﹣FreeDayto9withEurope'sCar﹣FreeDayonSeptember22.10thenwehavebeguntocallforcitizenstoorganize11onornearthisday. Howeverwedonotwant12onedayofcelebrationsandthenreturnto13life.WorldCar﹣FreeDayisthe14timetoremindcityplannersandpoliticiansto15cyclingwalkingandpublictransport.Itisuptouscitiesandgovernmentstohelp16permanentchangesto17pedestrianscyclistsandotherpeoplewhodonotdrivecars. While18accomplishmenthasbeenachievedintermsofmediacoveragetheseevents19tobedifficulttoachieverealsuccessandevenadecadelaterthereisconsiderableuncertaintyabouttheusefulnessofthisapproach.Broadpublicsupportand20tochangeisneededforsuccessfulimplementation执行. 1A.effective B.efficient C.useful D.alternative 2A.legs B.motors C.subway D.feet 3A.recall B.remind C.realize D.recommend 4A.projects B.events C.activities D.meetings 5A.as B.on C.with D.beyond 6A.when B.that C.where D.how 7A.undertaken B.submitted C.developed D.issued 8A.answer B.call C.wish D.longing 9A.connect B.involve C.consist D.concern 10A.Since B.Before C.After D.Right 11A.events B.affairs C.incidents D.accidents 12A.even B.still C.just D.ever 13A.usual B.previous C.ordinary D.average 14A.perfect B.limited C.accurate D.correct 15A.givewayto B.givepriorityto C.giveriseto D.giveinto 16A.employ B.decrease C.create D.increase 17A.assist B.benefit C.instruct D.influence 18A.constant B.similar C.envying D.considerable 19A.turnout B.workout C.carryout D.figureout 20A.approach B.attitude C.chance D.commitment
Thereareseveraldifferenttypesoffiredepartments.Somehirefull﹣timepaidfirefightersandsomearerunentirelybyvolunteers.1afirefightermustgothroughstrictphysicalandacademictrainingtoensureastrongknowledgeoffiresafetyandthephysicalstrengthtohandlethetasksrequiredbymembersofafiredepartment. Joiningafiredepartmentrequiresthatbothphysicalandwrittentestsarepassedwithscoresshowingathoroughknowledgeoffiresafety.2. Thefirststepinjoiningafiredepartmentasapaidfirefighteristosubmitanapplicationaswellasacquiretheappropriatetraining.Usuallyfirefightersmusthaveahighschooldiplomaandsomecompletetwo﹣or﹣four﹣yearprogramsinfirescienceatcommunitycollegesanduniversities.3andifacandidatealreadyhasconnectionsatafiredepartmenthemayapplyforapositionstraightoutofhighschool. Onceacandidateappliesandisacceptedfortrainingatafiredepartmenthemustthencompleteseveralweeksoftrainingatthedepartment'strainingcenter.4.Whenthisisdonethecandidateissenttoafirecompanyforaperiodofprobation实习.Hehastocontinuetraininginthenewpositionwhilebeingdirectedbyexperiencedfirefighters.5.Anapplicationmustbesubmittedtothevolunteerfiredepartmenttheniftheapplicationisacceptedthecandidatewilllakeatrainingprogramandthenberequiredtopassaphysicalandwrittentest.Firefightersmustalsobecomecertified认证asEmergencyMedicalTechniciansEMTs.ThelevelofEMTcertificationisdeterminedbytheindividualdepartments. A.Althoughitisdemanding B.Whichevertypeisdesired C.Howeveranacademicprogramisnotrequired D.Forvolunteerfirefighterstheprocedureissimilar E.Butjoiningavolunteerfiredepartmentistotallydifferent F.Trainingconsistsofclassroomworkandpracticaltraining G.Alsoacandidatemustbeabletorespondquicklyinemergencies
如图为遗传学中的中心法则图解图中①②③分别表示的过程是
某生物的体细胞含有42条染色体在减数第一次分裂四分体时期细胞内含有的染色单体染色体和DNA分子数依次是
下列物质不能作为调节生命活动的信息分子的是
如图是某草原生态系统中部分生物之间关系的示意图请根据图回答下列问题． 1图中鼠和食草昆虫属于第营养级． 2该生态系统中许多食物链彼此交错连接成． 3图中最长的食物链是． 4若该草原被火灾毁灭多年后重新演替为草原这种演替方式属于演替．
小华探究凸透镜的成像规律． 1课间小华到室外利用太阳光来测量凸透镜的焦距她将该凸透镜正对着太阳光如图甲所示．此时纸上呈现一个并非最小的光斑时测得这个光斑到凸透镜的距离为L．此时再将这个凸透镜与纸之间距离稍微增大若光斑变大则凸透镜的焦距fL选填“＞”“＜”或“＝”调整以后得到该透镜的焦距为10cm． 2当烛焰位于如图乙所示位置时移动光屏可在光屏上得到一个清晰的像此成像规律常用在选填“放大镜”“照相机”或“幻灯机”上保持凸透镜位置不变将点燃的蜡烛放在光具座上20cm刻线处要在光屏上重新得到烛焰清晰的像应将光屏向选填“左”或“右”移动． 3当烛焰再次位于如图乙所示位置时若将蜡烛稍远离凸透镜光屏上的像变模糊若不移动光屏要再次在光屏上得到清晰的像则可在蜡烛和凸透镜之间再放上一个焦距合适的选填“近视眼镜”或“远视眼镜”．
FromAntiguatoZanzibarfthesespotspromiseanincredibletripfor2019. AntiguaGuatemala Antiguaiswortheverypennybutthatdoesn'tmeanyou'llhavetoemptyyourwalletsaysHudson.Thereareplentyofbudgel﹣carisciousactivities.Itwon'tcostyouacointovisitSantoDomingodelCerroanoutdoorsculpturepark.Wantingsomethingsweet?HeadtoChocoMuseo.Admissionisfreeandsoarethesamples! OdessaUkraine Odessaishavingabitofatourismboomnationwide﹣notthatwe'resurprisedgivenitssandybeachesandpastel﹣coloredbuildings﹣butit'sstillfairlyundertheorderforinternationalaudiences.Youcanalsocountonthisportcityforaffordablefun.TicketstotheOdessaOperaHousestartatamere﹩2! BogotaColombia TravelersonbudgetwillfindColombia'svastcapital.farmoreofabargainandeverybitasfascinatingsaysHudson.It'sfreetovisitMuseodeOroandonSundaysmanyofthebigroadsareclosedtoaccommodatefoodcartsstreetentertainersandpedestrians. Zanzibar Zanzibarattractsvacationerswithitswhitesandbeachesgreenish﹣blueddescolorfulcoralreefsandoceanfrontseaside.OfcoursewanderinginhistoricStoneTownisprettyappealingtoo.Eitherwayyouneedn'tspendapennyinthisamazingplace.It'salsoworthnotingthatJozaniForestistheonlyplaceintheworldyoucan9eeendangeredredcolobusmonkeys. 1Whichofthefollowingrequiresadmissionfee? A.ChocoMuseo. B.StoneTown. C.MuseodeOro. D.OdessaOperHouse. 2WhatisspecialtoZanzibar? A.Whitesandbeaches. B.Colorfulcoralreefs. C.Redcolobusmonkeys. D.HistoricStoneTown. 3Whatdothefourdestinationshaveincommon? A.Theyarecoastalcities. B.Theyareinexpensivetovisit. C.Theywelcomestreetentertainers. D.Theywillmakeyourwalletempty.
一个DNA分子复制完毕后新形成的DNA子链
如图是自动测定油箱内油量的装置图油量表相当于电压表其中R0是一定值电阻R是弧形变阻器它的金属滑片P是杠杆的一端O为杠杆支点下列判断正确的是
假定你是李华你和几个朋友打算去参观茶园想邀请美国交流生Henry同往.请你给他写封邮件告知活动安排.内容包括 1.时间和地点; 2.学习如何沏茶品茶; 3.介绍中国茶文化的历史和发展. 注意 1.词数100左右; 2.可以适当增加细节以使行文连贯. DearHenry Yours LiHua
如图是三个相邻的植物细胞之间水分流动方向示意图．图中三个细胞的细胞液浓度关系是
如图1灯距地面的高度为H身高为h的人自路灯的正下方经过看到自己头部的影子正好在自己脚下．如图2如果人以不变的速度v匀速向前走由A到B则人头部的影子由C运动到D．证明人头部影子的速度为．
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.每次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\划掉. 修改在错的词下画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. Mauritiusanislandnationisworkingtogetridoffossilfuelsbyreplacethemwithsugarcanestalks.Anislandhasreliedonimportedgasasfuelforlongbutitpointsoutwhichitsmaincashcropisprovidingamoreeconomicalchoice. Onceasugarcanestalkhassqueezedapileofdrystalksremain.Theseleftoversarethenburnedtogeneratepoweranditaccountsfor14percentsoftheisland'senergyneeds. Sugarcanesthenation'smaincashcropcontinuesleadingthechargetowardsamoreenvironmentalfriendlyfuture.Currentlyfoursugarcompaniesrunhisownpowerstationtogetherwithgeneratingupto60%oftheisland'selectricity.Howeverthecarbondioxidegeneratedbytheburningprocessisthenusedtoaddtosoftdrinks.
Balletisaformalkindofdanceperformancewitharichandinterestinghistory.ThewordballetcomesfromtheFrenchlanguageand1bebasedontheItalianwordballetto.Ballettomeansalittledance.Ballet'searlyrootsbeganinItalyinthelate1400s.ButitwasinFrance2balletdevelopedintotheformweknowtoday. TheFrenchrulerLouistheFourteenthhadabiginfluence3thedirectionofballetinitsearlyhistory.HeruledFranceforseventy﹣twoyears4startin1643.Hestarteddancingasaboyandworkedharddaily. LouistheFourteenthturnedballetintoaformofdancethatreflected5hepowerandinfluence.Ballet'smanyrulesand6extremedetailedmovementsexpressedaperson'spowerandsocialrelations.Thekingmadesurethatballetbecamea7requireforthepeopleofhiscourt.HealsostartedtheRoyalAcademyofDance8importantpeoplecouldlearnthisart.Theaimofthisdancewasself﹣controlorderandperfection. Balletslowlychangedfromadanceattheking'scourttoone9performbyprofessionaldancers.WhenLouistheFourteenthdiedin1715ballet10bringtoodierpartsofEuropeandwasdevelopinginotherways.
如图是某些细胞器的亚显微结构模式图相关叙述错误的是
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