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如图,在扇形AOB中,AC为弦,∠AOB=140°,∠CAO=60°,OA=6,则的长为( )
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如图在扇形AOB中∠AOB=90°弧AB的长为2π则扇形AOB的面积为.
如图在扇形AOB中∠AOB=90°正方形CDEF的顶点C.是弧AB的中点点D.在OB上点E.在OB的
如图在扇形AOB中AC为弦∠AOB=140°∠CAO=60°OA=6则的长为
π
π
2
π
2π
如图在扇形AOB中∠AOB=90°半径OA=6将扇形AOB沿过点B的直线折叠点O恰好落在弧AB上点D
如图在扇形AOB中AC为弦∠AOB=130°∠CAO=60°OA=6则的长为.
若两个扇形满足弧长的比等于它们半径的比则称这两个扇形相似.如图如果扇形AOB与扇形A1O1B1是相似
1个
2个
3个
4个
如图在扇形AOB中∠AOB=90°半径OA=6将扇形AOB沿过点B.的直线折叠点O.恰好落在弧AB上
已知在△AOB和△COD中OA=OBOC=OD1如图①若∠AOB=∠COD=60º求证①AC=BD②
如图在⊙O中半径OA垂直于弦BC垂足为E点D在CA的延长线上若∠DAB+∠AOB=60°1求∠AOB
已知扇形AOB的圆心角∠AOB为120°半径长为6扇形AOB的面积是.
如图圆C.内切于扇形AOB∠AOB=若在扇形AOB内任取一点则该点在圆C.内的概率为________
半径为1的圆中扇形AOB的面积为则扇形的圆心角为.
已知扇形AOB的周长为8则扇形AOB的面积的最大值是此时弦长AB=.
已知半径为10的圆O.中弦AB的长为10.求α∠AOB所在的扇形的弧长l及弧所在的弓形的面积S..
如图扇形AOB中∠AOB=150°AC=AO=6D为AC的中点当弦AC沿扇形运动时点D所经过的路程为
如图扇形AOB的圆心角为120°半径长为6弓形ACB的面积为__________.
如图8在矩形ABCD中对角线ACBD相交于点O.若∠AOB=60°AB=4cm则AC的长为__cm.
如图扇形AOB中∠AOB=150°AC=AO=6D为AC的中点当弦AC沿扇形运动时点D所经过的路程
3π
4π
3.00分如图扇形AOB中∠AOB=150°AC=AO=6D为AC的中点当弦AC沿扇形运动时点D所
3π
4π
如图在⊙O中P.是弦AB的中点CD是过点P.的直径则下列结论中不正确的是
AB⊥CD
∠AOB=4∠ACD
OP=PD
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如图图示可表示某些物质在一定条件下发生化学反应的过程代表三种不同的原子则下列说法正确的是
我和我的朋友们在昨天的晚会上玩的很开心.Imyparentsatthepartyyesterday.
假设你是红星中学高三学生李华.你校将在下周举办校园书市活动.请给你校美国交换生Jim写封邮件邀请他参加.邮件内容包括:1.书市活动的相关内容时间地点活动等;2.说明你自己要参加的活动和理由;3.询问他是否愿意参加.注意:1.词数不少于50; 2.开头和结尾已给出不计入总词数.提示词:校园书市:campusbookfair DearJim Yours LiHua
TheParents'LifesavingTouch OnMarch252010KateandDavidheardthewordseveryparentfeelsfrightenedof:Theirnewbornwasn'tgoingtomakeit.Theirtwins﹣agirlandaboy﹣wereborntwominutesapartand14weekspremature早产的1justovertwopoundseach.Doctorshadtriedtosavetheboyfor20minutesbutsawno2.Hisheartbeatwasnearlygoneandhe'dstoppedbreathing.Thebabyhadjustminutesto3. Isawhimgasp喘息weaklybutthedoctorsaiditwasno4KatetoldtheDailyMailfiveyearslater.Iknowitsoundsstupid5ifhewasstillgaspingthatwasasignoflife.Iwasn'tgoingtogiveup6. Inanefforttocherish珍惜herlastmomentswiththetinyboyKateaskedto7him.Thecoupleknewthiswaslikelya8. Kateremovedthehospitalblanket9theboywhomthecouplehadalready10JamieandorderedDavidtotakehisshirtoffand11herandtheboyinbed.Thefirst﹣timeparentswantedtheirsontobeaswarmaspossibleintheirarmsandhopedtheskin﹣to﹣skincontactwouldimprovehis12.Theyalsotalkedtohim. Weweretryingtoentice说服himtostayKatetoldtheDailyMail.Weexplainedhisnameand13hehadatwinwhohehadtolookoutforandhowhardwehadtriedto14him. Thensomethingcompletely15happened.Jamiestarted16again.Finallyhereachedforhisfather'sfinger. Thecouple'slostboyhadmadeit. We'rethe17peopleintheworldDavidsaid. EightyearslaterJamieandhissisterEmilyarehappyand18.Theparentsonlyrecentlytoldthekidsthestoryoftheir19.EmilyburstintotearsKatetoldtheDailyMail.ShewasreallyupsetandshekepthuggingJamie.Thiswhole20makesyoucherishthemmore. 1A.losing B.measuring C.weighing D.showing 2A.appreciation B.improvement C.prediction D.agreement 3A.live B.play C.grow D.think 4A.harm B.trouble C.wonder D.use 5A.but B.or C.and D.for 6A.gradually B.peacefully C.hardly D.easily 7A.cover B.hold C.cure D.wash 8A.risk B.party C.goodbye D.tradition 9A.around B.to C.beside D.against 10A.promised B.kept C.awarded D.named 11A.join B.place C.feed D.hide 12A.appearance B.condition C.memory D.skill 13A.why B.when C.that D.if 14A.protect B.raise C.teach D.save 15A.unbelievable B.unfamiliar C.natural D.acceptable 16A.waving B.speaking C.smiling D.breathing 17A.kindest B.luckiest C.bravest D.cleverest 18A.free B.relaxed C.healthy D.confident 19A.birth B.adventure C.growth D.education 20A.project B.experiment C.progress D.experience
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HongbaoinChina WhileWesternkidsdreamaboutwhatSantawillbringthemChinesekidswillbegettingtheirmoneyboxreadytoreceivehongbao.HongbaoredenvelopesarethetraditionalgiftsthatadultsgivechildrenduringtheChineseNewYearholidayperiod.ThegeneralideaisthatadultswithincomegivechildrenwithnoincomehongbaoduringChineseNewYear.1 You'llseehongbaousedasdecorationsonjustabouteveryChineseNewYearflowerandplantthatisdisplayedduringtheseason.2Andtheyareonlyusedfordecoration.Iknowbecausemysonchecksthemwheneverhecanreachthem 3Weddingsarebigeventswherehongbaoaregivenbyguestsinvitedtotheweddinginsteadofgifts.Theamountofmoneytogiveataweddingcanbetricky微妙的andifyouareinvitedtoaChineseweddingyoucanaskforsomeadviceabouthowmuchtogive. Ifyouneedhongbaoyoucanbuythematshopsatanytimeoftheyear.4Soyouensureyoudon'tgetonethatsaysCongratulationsonyourmarriageforabirthday. Thesedayspeopledon'tevenhavetoleavethecomfortoftheirsofastogivehongbao.Wechatapopularinstantmessageandphotosharingappintroducedelectronichongbaosonowit'seveneasier. 5 A.Thesewillbeempty. B.Itisnecessarytobuyfancyones. C.Hongbaoaregivenatotheroccasionstoo. D.Asktheshopownerorafriendwhichonetobuy. E.Friendssendeachotherhongbaofromtheirphones! F.Infactchildrencanevenmeanyoungadultswhoareunmarried. G.Youmaywantthecorrectstatementsonthefrontoftheenvelopeitself.
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推理是化学学习中常用的思维方法.下列推理正确的是
既然大家都在那我们开始开会吧.everyoneisherelet'sbeginourmeeting.
For1centurypeoplehavebelievedthatchickensoup2helptofightacold.Nowdoctorssayitmaybetrue.Theythinkthatchickensouphassomethingthatstopsacoldfromgetting3bad.Heatfromthesoupcanalsomake4personfeelbetter. Manypeoplethinkthatitisunhealthynottohavemeat.Itistruethatmeat5especialredmeathasproteinthatthebodyneeds.Aperson6doesn'teatmeatcangetenoughproteinandbehealthybyeatingtofueggsandsomevegetables.Astudyshowsthatteaisbetterthancoffee.Teahassomethingthatcanprotectyourheartfightcancerandmakeyoulessfat.Coffee7donotdothis. Manypeoplebelievethatbreadandpotatoescaneasilymakepeoplefat.Infactbreadandpotatoesdonothavefatinthem.But8eattoomuchandnotexercisingcanmakepeoplefat.9addingthingslikebutterto10theycanraisethechanceofbecomingfat.
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Whenwasthelasttimeyousatonaparkbench凳子?Didyoustayforlong?Anewkindofparkbencheswilllimittheamountoftimeyoucansitthere.Ifyoudon'tgetupintimeitcouldbeverypainful:therearemanysharpspikes钉子onthepartthatyousiton! Visitorswhowantarestonthebenchneedtoputacoininamachinenexttoit.Oncethemoneywasacceptedthespikesdisappearintothebench.Thenvisitorscansitdowncomfortablybutonlyforhalfanhour.Whenthetime'supthespikesslowlystartmovingupagain.Itdoesn'thurtatfirstbutafteraminutetheystartcomingupevenmorequickly.Theyaren'tlongenoughtocauseserioushurtbuttheydocausepainastestshaveshown.Butwhyhavetheybeeninstalled安装? Ourpublicparkisverypopularinsummeraspokespersonfortheparkexplained.Butwithallthethousandsofpeoplewhovisittheparktherearen'tenoughbenchesforeveryone.Wewanttomakesurethatthebenchesaresharedbymorevisitorsandtostoppeopletakingabenchandstayingthereallday.Installingspikesseemstobethefairestwayofstoppingpeopledoingthis. 1Howisthenewkindofparkbenchdifferentfromotherbenches?Itcanlimittheamountoftimepeoplesitonitwithsharpspikes./ Ifyoudon'tgetupfromitinlimitedtimeitcouldmakeyoupainful./ Therearemanysharpspikesonittolimittheamountoftimepeoplesitonit. 2WhatisParagraph2mainlyabout? 3Whyarethenewbenchesinstalled? 4ThepassagesaysInstallingspikesseemstobethefairestwayofstoppingpeopledoingthis.Doyouagreewiththis?Pleasestateyourreasons.Yes.Ifpeopleareaskedtopayforbenchestheywillnottakeittoolongwhentheydon'treallyneedit.Thuseveryvisitorwillhavethechancetoshareit./ No.Benchesinparksshouldbefreetovisitors.Theparkcanbuildmorebenchestosolveitsprobleminsteadoflimitingthetimewhenvisitorshavearestonbenches.
爱护水资源越来越引起人们重视. 1某化学兴趣小组对附近的水质状况进行了相关调查 ①取回水样静置后过滤实验室过滤时需要的仪器有烧杯漏斗铁架台 ②可用检验该水样是硬水还是软水 2“生命吸管”是一种能够将河水等直接过滤成直饮水的便携式净水装备.吸管里面注入了活性炭等物质其中活性炭的作用是和过滤
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配制溶质质量分数一定的氯化钠溶液常按以下操作顺序进行请回答下列问题 1计算配制100g溶质质量分数为5%的氯化钠溶液所需氯化钠g 2用托盘天平称量所需的氯化钠时发现托盘天平的指针偏向左盘接下来的操作应是 A.增加适量氯化钠固体B.减少适量氯化钠固体C调节平衡螺母 3用量筒来量取所需的水水的密度为1g/cm3量筒的规格是从下列中选用50mL100mL200mL 4将氯化钠和水依次倒入烧杯中用玻璃棒搅拌其目的是 5如果所配得的溶液溶质的质量分数比5%小你认为可能的原因有任写一条 6某同学想用10%的氯化钠溶液配制100g5%的氯化钠溶液则需要10%的氯化钠溶液g需加水g.
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春节里父母都会给孩子穿上新衣服然后走亲访友.DuringtheSpringFestivalparentswilltheirchildrenandvisittheirrelativesandfriends.
她为自己的两个孩子都有音乐天赋而自豪. Shewasproudthatbothherchildren.
春天来了我们期待着一起去郊游. Springiscoming.Weaschoolouting.
下列实验操作先后顺序错误的是
Twomenbothseriouslyillsharedthesamehospitalroom.Onemanwasallowedtositupinhisbedforanhoureachafternoon.Hisbedwasnexttotheonlywindowoftheroom.Theothermanhadtospendallhistimeflatonhisback.Thementalkedforhoursonend.Theyspokeoftheirwivesandfamiliestheirhomestheirjobstheirexperienceinthearmyandwheretheyhadbeenonvacation.Everyafternoonwhenthemaninthebedbythewindowcouldsituphewouldpassthetimebydescribingtohisroommateallthethingshecouldseeoutsidethewindow.Themanintheotherbedbegantoliveforthoseone﹣hourperiodswhenhisworldwouldbebroadenedandenlivenedbyalltheactivitiesandcolorsoftheworldoutside. Thewindowoverlookedaparkwithalovelylake.Ducksandswansplayedonthewaterwhilechildrensailedtheirmodelboats.Youngloverswalkedarminarmamongflowersofeverycolor.Grandoldtreesmadeeverythingaroundmoreattractiveandafineviewofthecityskylinecouldbeseeninthedistance.Asthemanbythewindowdescribedallthisingreatdetailthemanontheothersideoftheroomwouldclosehiseyesandimaginethepicturesquescene.Onewarmafternoonthemanbythewindowdescribedaparadepassingby.Althoughtheothermancouldn'thearthebandhecouldseeitinhismind'seyeasthegentlemanbythewindowpictureditwithdescriptivewords. Daysandweekspassed.Onemorningthedaynursearrivedtobringwaterfortheirbathsonlytofindthelifelessbodyofthemanbythewindowwhohaddiedpeacefullyinhissleep.Shewassaddenedandcalledthehospitalattendantstotakethebodyaway.Assoonasitseemedappropriatetheothermanaskedifhecouldbemovednexttothewindow.Thenursewashappytomaketheswitchandaftermakingsurehewascomfortableshelefthimalone.Finallyhewouldhavethejoyofseeingitforhimself. 注意: 1.所续写短文的词数应为150左右; 2.使用5个以上短文中标有下划线的关键词语; 3.续写部分分为两段每段的开头语已为你写好; 4.续写完成后请用下划线标出你所使用的关键词语. Paragraph1: Slowlyandpainfullyhemadehisgreatestpossibleeffortstolookoutofthewindowbesidethebed. Paragraph2: Themanwasblindandcouldnotevenseethewall.Perhapshejustwantedtoencourageyou.thenurseanswered.
UnderwaterMuseums Manyunderwatermuseumsaresupportedbycompaniesthatofferguidedtours.Atrainedguideleadsgroupsaroundastrikingunderwaterdisplayofstatuesineachmuseum.Dependingonthedepthofthemuseumvisitorsmaybeabletoviewthesculpturesfromtheglass﹣bottomedboatorbyswimmingonthesurface.Otherunderwatermuseumsaredeeperandaremostaccessibletoscubadivers. Underwatermuseumshavemanyfunctions.Oneoftheirmainpurposesistocreateanartificialreefenvironmentwhereseacreaturescanlive.That'swhysomeofthemuseumsarelocatedinareasthatweredamagedbyhurricanesorareconsideredunderwaterdeserts.Thestatuesinthemuseumaredesignedinawaythatencouragesthegrowthofcoralandplantlife.Overtimethestatuesandplantsattractmoreandmorefishtothearea. FloridaU.S.A Floridaishometodifferenttypesofunderwatermuseums.Thestate'snewestunderwatermuseumtheUnderwaterMuseumofArtcanbefoundoffthecoastofGraytonBeach.ThispartoftheGulfofMexicoisanunderwaterdesertsocreatorshopethattheexhibitwillimprovethemarineecosystem. CancunMexico ForyearsCancunhasbeenapopulartouristdestination.Andoneofthemajordrawsisthewater.TheMuseoSubacuaticodeArteisanidealplaceforsnorkelersandfirst﹣timedivers.Theretheycanenjoymorethan500statuesthathelptomakeupanartificialreef.Thismuseumwascreatedtogivevisitorsanalternativeattractiontothearea'snaturalreefwhichhasbeendamaged. CanaryIslandsSpain MuseoAtlantiooffthecoastofLanzarotehasanimpressivedisplayofmorethan300statues.TheywerecreatedbyJasonDecairesTayloraBritishsculptorwhohascontributedtothecreationofseveralunderwatermuseumsincludingtheonesnearCancunandtheCanaryIslands.TheCancunstatuesfocusonman'sinteractionwiththemarineworld.Ifyou'relookingforadifferentmuseumexperiencecheckoutonethat'sunderwater. 1Inunderwatermuseumsvisitorscanseethefollowingthingsexcept. A.statues B.deserts C.reefs D.sculptures 2Accordingtothepassagewhichofthefollowingstatementsistrue? A.Underwatermuseumscannotbevisitedthroughguidedtours. B.Underwatermuseumsarealllocatedinareasdamagedbyhurricane. C.Underwatermuseumscanbeviewedallovertheworld. D.Underwatermuseumscanhelpimproveunderwaterenvironments. 3Wecanlearnfromthepassagethat. A.over300statuescanbeseenintheUnderwaterMuseumofArt B.naturalreefhasn'tbeendamagedinCancun C.thestatuesofCancunandtheCanaryIslandsaremadebythesamesculptor D.plantlifecan'tgrowinunderwatermuseums 4Whereisthetextprobablytakenfrom? A.Apersonaldiary. B.Atouristguidebook. C.Anofficialreport. D.Ahotelbrochure.
化学与生活密切相关下列说法错误的是
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