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如图,在Rt△ABC中,∠ACB=90°,∠B=30°,AC=1,且AC在直线l上,将△ABC绕点A顺时针旋转到①,可得到点P1,此时AP1=2;将位置①的三角形绕点P1顺时针旋转到位置②,可得到点...
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如图在Rt△ABC中∠ACB=90°AC=BC=1将Rt△ABC绕A.点逆时针旋转30°后得到Rt△
如图N44在Rt△ABC中∠ACB=90°∠
=30°,CD⊥AB于点D.则△BCD与△ABC的周长之比为( ) A.1∶5
1∶4
1∶3
1∶2
如图Rt△ABC中∠ACB=90°∠ABC=30°AC=1将△ABC绕点C.逆时针旋转至△A.′B.
如图在Rt△ACB中∠ACB=90°∠
=25°,点D.是AB上一点.将Rt△ABC沿CD折叠,使
点落在AC边上的点B.′处,则∠ADB′等于( )
A.25° B.30°
35°
40°
如图在Rt△ABC中∠ACB=90°∠A=30°BC=2.将△ABC绕点C旋转得到△EDC使点D在A
如图在Rt△ABC中∠ACB=90°AC=BC=1将Rt△ABC绕A.点逆时针旋转30°后得到Rt△
如图在Rt△ABC中∠ACB=90°AC=BC=1将Rt△ABC绕A.点逆时针旋转30°后得到Rt△
如图已知Rt△ABC中∠ACB=90°CD是高∠
=30°,BD=2cm,求AB的长( )
A.4
6
8
10
如图在Rt△ABC中∠ACB=90°AB的垂直平分线DE交AC于E交BC的延长线于F若∠F=30°D
如图在Rt△ABC中∠ACB=90°∠ABC=30°将△ABC绕点C.顺时针旋转至△
′
′
,使得点A.′恰好落在AB上,则旋转角度为( ) A.30° B.60° C.90°
150°
如图所示在Rt△ABC中∠ACB=90°∠B.=30°ED是BC的垂直平分线请写出图中两条相等的线段
如图在Rt△ABC中∠ACB=90°CD⊥AB于点D.点E.是AB的中点∠BCD=20°则∠ACE=
20°
30°
45°
60°
如图在Rt△ABC中∠ACB=90°∠B=30°CD是斜边AB上的高AD=3cm则AB的长度是
3cm
6cm
9cm
12cm
如图在Rt△ABC中∠ACB=90°AC=BC=2将Rt△ABC绕点A.逆时针旋转30°后得到Rt△
如图在Rt△ABC中∠ACB=90°AB的垂直平分线DE交AC于E交BC的延长线于F若∠F=30°D
如图在Rt△ABC中∠ACB=90°DEDF是△ABC的中位线连接EFCD.求证EF=CD.
如图已知在Rt△ABC中∠ACB=90°∠B.=30°C.D.⊥AB于D.求证AD=AB
如图Rt△ABC中∠ACB=90°DE过点C.且DE∥AB若∠ACD=50°则∠B.的度数是
50°
40°
30°
25°
如图Rt△ABC中∠ACB=90°CD⊥AB于D.∠ACD=40°则∠B.=
如图所示在Rt△ACB中∠ACB=90°∠A=25°D.是AB上一点.将Rt△ABC沿CD折叠使B.
25°
30°
35°
40°
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Shewantstoearnalivingbyherselfandbeanwoman.depend
图a所示电路当闭合开关S后两个电压表指针偏转均为图b所示则电阻R1和R2两端的电压分别为
40分Ahumpbackwhaleisstrugglinghardinthesea.Thehumpbackscanweigh40tonsandstretch50feelfromnosetotail.That'sthekindof1andsizethateasilyoverturnsmallboats.Tojumpontothe2ofoneofthesegiantsis3toresultinadisaster.Butthat'sjustwhatSamSynsleliendidwhenhesawahumpback4caughtinaropethatwas5toabuoy浮标inCentralCaliforniansMorroBaythisweek. SamalongwithcrewmateNicholasTaronhadalreadytried6theunfortunatewhaletotheU.S.CoastGuard一buttheyweretolditwouldbehoursbefore7couldbesent.8thecommercialfishermen9thiswhaledidn'thave.Ifthewhalewasto10theyhadtogogetit.Therewasnoother11forthewhale.Theydecidedtogoforittotally12thefear.Turon's13intherescuewasmostlyinthe14cheeringdepartment.Intheclipyoucanhearhimdirectingtheoperationfromthesideoftheboatwhilefilmingtheentire15. Swim!Swim!HeyellsMove!Justgetit!Getit! Theanxiouswhalewasjustswimmingincounter﹣clockwisecircles16andbeingheldtothebottom.Itthrewitsheavytailagainsttheboat.ButSam17itandjumpedontothewhale'sbacktosaveitslife.Hemanagedtohanginthere18cuttingthroughtheropethat19thecreature.Andthenwithawhoosh击水声itdovedeepdownbeneaththegreat20.Itwasn'tmuchofathankyoubutSynstelienandTaronwereleftwithawhaleofatale. 1A.length B.violence C.ability D.weight 2A.nose B.head C.back D.tail 3A.willing B.likely C.anxious D.flexible 4A.hopelessly B.loosely C.curiously D.secretly 5A.stuck B.directed C.adjusted D.attached 6A.shipping B.delivering C.reporting D.hunting 7A.boats B.rescuers C.fishermen D.experts 8A.Strength B.Advantages C.Patience D.Hours 9A.figured B.objected C.hesitated D.proved 10A.paddle B.survive C.relax D.breathe 11A.barrier B.accommodation C.option D.equipment 12A.hiding B.exhibiting C.fostering D.ignoring 13A.interest B.ambition C.role D.contribution 14A.disturbing B.enthusiastic C.clumsy D.scared 15A.operation B.creature C.performance D.fighting 16A.silent B.stressed C.confused D.unconscious 17A.wrestled B.spotted C.trained D.approached 18A.eventually B.naturally C.directly D.normally 19A.prohibited B.injured C.tied D.monitored 20A.waves B.noises C.ferry D.darkness
Yourisrequiredatthemeeting.present
10分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. Myfatherisapoliceman.Onacoldwintereveninghesawoldbeggarsittinginasquareoutsideashoppingcenter.Hisshoeshadbeenwornoutandhistoesstickout.Seehisfrozenfeetmyfatherfeltsad.Heleftandreturnedbackwithapairofnewshoesandsocksthatheboughtatanearbystore.Hekneltdownonthegroundbuthelpedtheoldhomelessmanputiton.Hisrandomactofkindnessmeltedtheheartsofthepasser﹣by.Awomanbroughtanoldblanketfromherhousetoprotectthebeggarwiththefreezingcold.Thebeggarwastouchedandsaiditwasnicetoknowthatangelstruewalkonearth.
在昼夜明灯的地下停车场驾驶员根据车位入口上方的红绿灯入停.如图是小吴设计的自动控制电路图将光控开关遮光时开关闭合装在每个车位地面中央红绿灯装在车位入口上方.当车位未停车时绿灯亮当车位已停车时红灯亮则图中L1L2
如图所示是小梦探究音调与什么因素有关的实验将钢尺的一端伸出桌面用手拨动钢尺使其上下振动发出声音.下列说法不正确的是
8分IvisitedElbalastJunejoiningMaryandJohnonabicyclingvacation.Theymadethearrangementsforthecarhotelandbicycles.IstudiedthehistoryoftheislandwhichofcourseparticularlyfeaturesNapoleon. NapoleonnowIknowpickedElbaasaplaceforpeacewhenhewasforcedtogiveupthethrone王权asEmperorofFrancein1814.FarfrombeingaprisonislandElbaisbeautifulwithtoweringmountainsthickforestsandsweepingbaysandbeaches. Itisalsoanislandfilledwithtreasure.Veryearlyonthisislandlocalsdiscoveredrichdepositsofiron.Soonoutsiderstoodiscoveredtheironand150othervaluablemineralsonthislittlepieceofland.LongbeforeEtruscansandotherGreekssetfootonitDorianshadmovedinbythetenthcenturyB.C.andwereminingtheisland.TheRomansrulednextobtainingthemineralsandbuildinggrandhousesoverlookingthesea.FromthetwelfthcenturyuntilthenineteenththeislandwastradedbackandforthandwaspassedtoFrancein1802.ThencameNapoleonthenewrulerofElba. IwaseagertovisithishouseinPortoferraio.TheEmperorlivedwithhiscourtandhismotherbuthiswifeMarieLouisehadensconcedherselfinthesplendidViennesepalaceofherfatherEmperorofAustria.Shelivedsafelythereandshowedlittleinterestinvisitingherhusbandinhismini﹣kingdom.ApparentlyNapoleonwasn'ttroubledmuchbythis.Hewastoobusyridingeverywhereonhorsebackbuildingroadsmodernizingagricultureandaboveallsharpeninghistinyarmyandnavyintoreadinessforhisescape. IntheformalgardensbehindthehouseitseemedtomethatIcouldimaginetheexiled流放的conqueror'sanxiousthoughts.HemightgazeoverwhereIstoodnowtowardthelighthouseoftheStellafortthesandybayandacrossitthegreenmountainsoftheTuscancoast.NapoleonspentonlytenmonthsherebeforemakinghisvictoriousreturntoFranceandthethrone. 1WhatdidtheauthordoforthevisittoElba? A.Hedidresearchonitspast. B.Hearrangedtransportation. C.Heplannedbicyclingroutes. D.Hebookedaccommodation. 2WhomightbetheearliestoutsiderstoElbaaccordingtothetext? A.Napoleonandhisarmy. B.EtruscansandotherGreeks. C.Dorians. D.Romans. 3Whatdoestheunderlinedwordensconcedprobablymean? A.Settled. B.Locked. C.Cured. D.Controlled. 4Whatcametotheauthor'smindduringhisvisittoNapoleon'sgardens? A.BeautifulviewsonElba. B.TerriblelivingconditionsonElba. C.Napoleon'sambitiontoregainpower. D.HardshipofNapoleon'sreturntoFrance.
人类对火星有了一些了解火星上没有氧气火星上中午的温度可能在50度左右而晚上则在零下100度左右了.knowalittleabout .
如图所示当两根用毛皮摩擦过的带电硬橡胶棒相互靠近时下列说法正确的是
15分TheForbiddenCityinBeijinghometothePalaceMuseumhousesmorethan1.8millionculturalrelicsandisoneoftheworld'smostvisitedtouristattractions. 1markthe600thanniversaryoftheForbiddenCitythePalaceMuseumwillholdaseriesofeventsthroughout2020.Over20exhibitionswillbeheld2coverdifferentareassuchashistoryartfestivalsandsoon.ForthespecialoccasionAlongtheRiverduringtheQingmingFestivaloneofChina'smost3wideknownmasterpieceswillgoondisplayinSeptember2020.For4itbestpreservationthistreasuredartworkisseldomfullyexhibited.Thepainting5displayforthefirsttimebackin2005tocelebratethemuseum's80thanniversary.Such6raresightisexpectedtodrawhugecrowds.Inadditionthemuseumwillalsodisplayexhibitsfromother7country. DuringthepastfewyearsthePalaceMuseumhasbeenworkinghardtogetthepublicfamiliar8thehistoryandcultureoftheForbiddenCity.Anditseemsthattheseeffortshavebeenpayingoffwithits9popularreachinganewheight.Over17millionpeoplevisitedthemuseumin2018of1040percentwereunder30yearsold.
Itisknowntoallthatmanisinspace.weight
下列关于内能的说法中正确的是
图a是天平调节前的情形图b是天平调节平衡后称量物体质量时砝码及游码的示数下列说法正确的是
为了测量某山如图所示的高度甲在山顶A测得C处的俯角为45°D处的俯角为30°乙在山下测得CD之间的距离为400米.已知BCD在同一水平面的同一直线上求山高AB.可能用到的数据≈1.414≈1.732
25分假定你是李华你们学校的英国交换生Jeff准备参加外国人讲中国成语idiom故事比赛他发邮件请你给予辅导.你回复邮件内容包括 1.答应帮助 2.提出建议 3.询问辅导时间与地点. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯. DearJeff Yours LiHua
Theearthbeganwithacloudofenergeticdustwhichslowlycombinedintoaball1aroundthesun.Astheearthexplodedwithfireandrockwatervapourcarbonoxygennitrogenandothergases2producetomaketheearth'satmosphere.3waterappearingontheearthlifebegantodevelopfirstinthewaterintheformofsmallplants.Theseplantsmultipliedandfilledtheoceansandseaswithoxygenwhichmade4possibleforearlyshellfishandallsortsoffishtodevelop. Overmanymillionsofyearsgreenplantsbegantoappearonland.Withtheoxygenproducedbythegreenplantslandanimals5insectsandamphibianscameintobeing.Whentheplantsgrewinto6reptilesappeared7producedyoungbylayingeggs.Mammalswerethelastgroupofanimalsand8fromthepreviousanimalstheyproducedtheiryoungfrom9theirbodies. Smallbutmostadvancedanimalsnowwithhandsandfeetappearedandspreadallovertheearth.Theyweresocleverthattheybecamethemastersovertheearth.10theyaren'ttakinggoodcareoftheearthand11stopexploitingtheresourcesoftheearthtodevelopnewwaysofliving.12timegoesbymany13havebeendonetotheearthbythem.14lifewillcontinueontheearthformillionsofyears15comewilldependonwhethertheywillstopdamagingtheearth.
12分Three﹣quartersoftheworld'scoffeefarmsdestroyforesthabitattogrowcoffeeinthesunandtypicallyuseharmfulpesticides杀虫剂andchemicalsthatpoisontheenvironment.Whenforestsdisappearmigratory迁徙的songbirdsdisappeartoo.InordertodealwithseverepopulationandhabitatlossSmithsonianscientistscreatedtheBirdFriendlycertification. BirdFriendlycoffeesareshade﹣grownmeaningthecoffeeisplantedundertreesratherthanonthelandthathasbeenclearedofallotherplants.Coffeeexpertssayshade﹣growncoffeestastebetterbecausethebeansripenslowerthancoffeegrowninthefullsunresultinginarichermorecomplexflavor.BirdFriendlycertifiedcoffeesgrowunderbio﹣diverseshadethatprovideshabitatformigratorysongbirdsandotherwildlifestorescarbonandfightsclimatechange.BirdFriendlycoffeesarealsocertifiedorganicmeaningtheyaregrownwithoutpesticideswhichisbetterforpeopleandfortheplanet. BirdFriendlyproducerscanalsoearnmorefortheircrops.Thewoodandfruittreesonshadecoffeefarmsprovidefarmerswithadditionalincome.EverycupofBirdFriendlycoffeepurchasedrewardsthesefarmerswithalittlemoremoneyforbeinggoodstewardsoftheenvironmentandencouragesthemtocontinueconservingBirdFriendlyhabitat. BuyingBirdFriendlysupportstheSmithsonianMigratoryBirdCenter'sconservationresearchaimedatunderstandingandprotectingyourfeatheredfriends.YoucanpurchaseBirdFriendlycertifiedcoffeesaroundtheworldandprotectwildlifeandhabitatwitheverycup.Findastoreorcafenearyouorbetteryethaveitshippedtoyourdoorwhenyouorderonline. 1Whatisthepresentsituationofcoffeefarms? A.Onefourthofthemhavedestroyedforesthabitatforbirds. B.Pesticidesandchemicalsusedonthempoisonedmanybirds. C.Farmershavebeenawareofenvironmentprotection. D.Scientistspayattentiontothemandhavecomeupwithanidea. 2What'sacharacteristicofBirdFriendlycoffees? A.Theymayhaveabettertaste. B.Theyhaveastrangeflavor. C.Theytakelesstimetoripen. D.Theyaregrownonunpollutedland. 3HowcanBirdFriendlyfarmersearnmoremoney? A.Bychargingconsumersmoremoney. B.Bysellingfruitsandwoodfromtrees. C.Bycuttingdowntreesandsellingwood. D.Byservingasstewardsofcoffeeconsumers. 4Whatdoesthetextsuggestcoffeeconsumersdo? A.Consumelesscoffee. B.Ordercoffeeonline. C.Purchaseshade﹣growncoffee. D.Donatetocoffeefarmers.
我们不知道火星上是否有生命.whetherexistlife .
LearntoCiteSources引用资料 Duringyouruniversityeducationyou'llbeexposedtoideasandscientifictheoriesofscholarsandscientists.Unavoidablyyourownideaswillbeshapedbytheideasyoucomeacross.1Thatmeansyoushouldgobeyondwhatyoulearninyourtextbooksorinthelibrary.Youroriginalworkisthebasisforyourprofessor'sevaluationofyourperformance.Thusacademichonestyisfundamentalinyouruniversityeducation.Itdemandsthatyoucitethesourcematerialsyoubaseyourownworkon.2. Correctlycitingyoursourceshelpsyoudistinguishyourownideasfromthoseofotherscholars.Onthereaders'sideitpermitsareadertodeterminethedepthofyourresearch.3Onthecontrarylackofcitingwillonlyraiseyourreader'sdoubt. Soyouneedtolearnwhentociteandhowtoprovideanadequateoraccuratereferencelist.Ifyoufailtociteyoursourceswhetherdeliberatelyorcarelesslyyouwillbefoundresponsibleforplagiarism抄袭.4Ifyouarenotsureaskyourprofessorforguidancebeforesubmittingthepaperorreport.Keepinmindthisgeneralrulewhenindoubtcite! 5ForexamplestudentsfromEastAsiamaythinkthatcopyingdirectlyfromsourcesistheproperwaytodoresearch.StudentsinFrancepreparingforthefinalexaminationmaybeencouragedtomemorizewholepassagesandcopythemintopapers.Thoseculturaldifferencescanleadtofalseassumptionsaboutacademicexpectationsinthecountryyoustudyin. A.Someuniversitystudentsmaycheatindifferentways. B.Theseincludeotherscholars'ideasfiguresgraphsandsoon. C.Theacademicchallengeyoufaceistomakesomethingoriginal. D.Oftenstudentswanttouseothers'opinionstosupporttheirownessays. E.Italsoallowsareadertoappreciateyouroriginalcontributiontotheresearch. F.Forinternationalstudentsitisimportanttoknowlocalacademicexpectations. G.Notknowingacademicregulationsisanunacceptableexcuseforsuchbehavior.
Heisfullof.energetic
既然火星与地球完全不同如果我们计划有朝一日去火星的话我们就要带上氧气食品衣服和住的地方.shelter .
Theheatwillduringtheevening.less
Theofthisindustrywilltakeseveralyears.develop
SmartKidsFestivalEvents SmartKidsisacollectionofonehundredeventsscheduledinOctober.ThisyearitisexperimentingwithPayWhatYouDecidePWYD.Thatisyoucandecidetopaywhatyouwanttoorcanaffordafteryouhaveattendedanevent.Youcanpre﹣bookeventswithoutpayingforaticketinadvance.Herearesomeofthedirector'spicks. WalkontheWildSide NotticketedFree JoinstorytellerSarahLawtohearsciencestoriesaboutanimals.Alongthewayyou'llmeetallsortsofbeautifulcreaturesanddiscoverlifecyclesandfoodchains.Bestsuitedtochildrenaged5﹣9.Childrenunder8mustbeaccompaniedbyanadult. IntroductiontoWaves Pre﹣bookPWYD Subjectsrangefromsoundwavestogravitywavesandfromwavesoflighttocrashingwavesontheocean.MikeGoldsmithexploresthefundamentalfeaturessharedbyallwavesinthenaturalworld. ScienceintheField NotticketedFree Thisstorytellingnightfeaturesascientistsharinghisfavouritememoriesofgatheringfirst﹣handdataonvariousfieldtrips.Comealongforinspiringandinformativestoriesstraightfromthescientist'smouth.JoinMarkSamuelstofindoutmoreinthisfun﹣filledworkshop. FestivalDinner Pre﹣book£25perperson WhetheryouwanttoexploremoreaboutfoodorjustfancyatalkoveramealjoinustomarkthefirstsciencefestivalinLondon.Whichfoodsshouldyoueattotrickyourbrainintothinkingthatyouarefull?FindoutmorefromTomCrawford. 1Inwhicheventcanyoudecidethepayment? A.WalkontheWildSide B.IntroductiontoWaves C.ScienceintheField D.FestivalDinner 2Whowilltalkaboutexperiencesofcollectingdirectdata? A.SarahLaw. B.MikeGoldsmith. C.MarkSamuels. D.TomCrawford. 3Whatdothefoureventshaveincommon? A.Family﹣based. B.Science﹣themed. C.Pickedbychildren. D.Filledwithadventures.
计算﹣12019+×sin60°﹣﹣3.
在如图所示的电路中闭合开关S后两个灯泡都能发光电流表A1和A2的指针均在图乙所示的位置则通过灯泡L1的电流是A通过灯泡L2的电流是A.
我国许多城市之中建有大型绿地绿地中的人工湖具有“吸热”功能盛夏时节能大大减弱周围地区的“热岛效应”.若某一人工湖湖水的质量为1.0×107kg水温升高2℃则湖水吸收的热量为J.若这些热量被同等质量的砂石吸收c砂石<c水则砂石升高的温度选填“大于”“小于”或“等于”2℃.c水=4.2×103J/kg•℃
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12分About6yearsagoIwasonaplanenexttoawoman.Iwastiredandwantedtotakeanap.ButbeforeIcouldgointoignorepatternshetappedmeontheshouldertointroduceherself. HimynameisHelga! WegottotalkingandeventuallyitcameupthatIhadstartedanorganizationinhighschoolcalledR.A.K.E.RandomActsofKindnessEtc..AsIdescribedwhatwedidHelgagotveryseriousandtoldmethatsheadmiredmeforthat.Shetoldmeastoryaboutthelasttimeshehadflown.ShewasonthewaytoArizonabecauseshehadgottensuddennewsthatherdad'shealthwasonthedecline.Laterherfather'sphysiciancalledtoinformherthatherdadhadrathersuddenlypassedaway.Forthe3﹣hourplanerideshesatinsilencearoundstrangers. WhenshearrivedattheairportinArizonashewalkedtothenearestwallsatdownandcried.AndhereisthepartI'llneverforgetaboutHelga'sstory.For2hoursshesatandweptwhilethousandswalkedtoandfrointheairport.HelgalookedalmeandsaidHoustonnotasinglepersonstoppedandaskedifIwasokaythatday.ItwasthatdaythatIrealizedhowmuchweneedeachother.ItwasthatdayIrealizedthatkindnessisn'tnormal. Kindnessisn'tnormal.Thathasstuckwithmealltheseyearsespeciallynow.Iworkinschoolsnationwidespeakingaboutsympathykindnessempathy同理心andlove.I'mremindedallthetimethatformanyofuskindnessisnotusuallyourdefaultsetting.Wespendsomuchtimeworryingaboutourproblemsourlivesourinsecuritiesgettingtoourflightsowewalkbyorignorepeopleinneedofhelp. SoI'vemadeitmymissiontodomypartinsharingstorieswithstudentsteachersandparentsaboutourneedforcharacterandsympathy.I'malwaysbeonthelookoutforthelittleopportunitiesthatsurroundmeeverydaytodosomethingnice. 1WhatimpressedtheauthormostaboutHelga'sstory? A.Helga'sanxietyoverherfather'ssuddenillness. B.HelgahadnoonetotalktoonherflightloArizona. C.Helgawasignoredbypeoplearoundherwhenshecried. D.Helgacouldn'tgetoverhersadnessoverherFather'sdeath. 2Whichcanbestexplaintheunderlinedpartdefaultsettinginparagraph5? A.Usualwayofdoingthings. B.Unexpectedwaytodothings. C.Ignorancetopeoplearound. D.Biggestsurprisetoothers. 3Whatcanweknowabouttheauthor? A.Hestartedmanyclubsinhighschool. B.Heusedtobeaschoolteacher. C.Heteacheskidshowtobehavewell. D.Heisapromoterofagoodcause. 4Whatcanbeasuitabletitleforthetext? A.ComfortingPeopleinNeed B.MakingKindnessNormal C.IgnoringUnnecessaryTroubles D.PractisingKindnessonthePlane
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