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如图，AB是⊙O的直径，C是⊙O上的点，过点C作⊙O的切线交AB的延长线于点D．若∠A＝32°，则∠D＝ 度．
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如图AB是⊙O.的直径C.D.是⊙O.上的点∠CDB=20°过点C.作⊙O.的切线交AB的延长线于点
如图AB是⊙O.的直径C.D.是⊙O.上一点∠CDB=20°过点C.作⊙O.的切线交AB的延长线于点
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50°
60°
70°
如图AB是⊙O的直径点C在⊙O上过点C作⊙O的切线CD交AB的延长线于点D若AC=CD=3求⊙O的半
如图AB为⊙O.的直径点C.在⊙O.上连接BCAC作OD//BC与过点A.的切线交于点D.连接DC并
如图AB是⊙O的直径C.D是⊙O上的点∠CDB=20°过点C作⊙O的切线交AB的延长线于点E则∠E=
如图AB是⊙O.的直径C.D.是⊙O.上一点∠CDB=20°过点C.作⊙O.的切线交AB的延长线于点
40°
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60°
70°
如图以线段AB为直径作⊙O.CD与⊙O.相切于点E.交AB的延长线于点D连接BE过点O.作OC∥BE
如图AB是⊙O.的直径C.D.是⊙O.上的点∠CDB=20°过点C.作⊙O.的切线交AB的延长线于点
如图AB是⊙O.的直径C.D.是⊙O.上一点∠CDB=20°过点C.作⊙O.的切线交AB的延长线于点
40°
50°
60°
70°
如图AB是⊙O.的直径C.是⊙O.上的点过点C.作⊙O.的切线交AB的延长线于点D.若∠A.=32°
已知⊙O.的直径AB=10弦BC=6点D.在⊙O.上与点C.在AB两侧过点D.作⊙O.的切线PD.Ⅰ
已知⊙O.的直径AB=10弦BC=6点D.在⊙O.上与点C.在AB两侧过点D.作⊙O.的切线PD.Ⅰ
如图BC是⊙O的直径A是⊙O上一点过点C作⊙O的切线交BA的延长线于点D取CD的中点EAE的延长线与
如图C.是以AB为直径的⊙O.上一点过O.作OE⊥AC于点E.过点A.作⊙O.的切线交OE的延长线于
如图已知⊙O中直径AB与弦AC的夹角为30°过点C作⊙O的切线交AB的延长线于点DOD=30cm.求
如图BE是O的直径点A和点D是⊙O上的两点过点A作⊙O的切线交BE延长线于点.1若∠ADE=25°求
如图所示圆O.的直径AB=8C为圆周上一点BC=4过C.作圆O.的切线l过A.作直线l的垂线ADD为
如图所示AB是⊙O的直径点C为⊙O上一点过点B作BD⊥CD垂足为D连接BCBC平分∠ABD.求证CD
如图1线段AB=4以线段AB为直径画☉O.C.为☉O.上的动点连接OC过点A.作☉O.的切线与BC的
如图AB为⊙O.直径C.是⊙O.上一点CO⊥AB于点O.弦CD与AB交于点F.过点D.作⊙O.的切线
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小华家在农村还没用上天燃气使用的是瓶装液化气．如果每瓶中装入20kg液化气液化气的热值取4.2×107J/kg则每瓶液化气全部完全燃烧放出的热量是J若放出的热量有50%被利用在标准大气压下可把kg的水从20℃加热至沸腾c水＝4.2×103J/kg•℃．一次烧水过程中水烧开后她看到锅盖向上跳动其原因是水蒸气的能转化为锅盖的能．大气压为一标准大气压
发电机的工作原理是它能将能转化为能田湾核电站是利用核产生的能量发电的选填“裂变”或“聚变”．
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. IwasusedtobeahealthygirlbutmorethantwoyearsagoIgetintothehabitofeatingalotofjunkfoodandsnacks.InadditionIspentalotoftimelayonthesofawatchingTVanddoinglittleexercise.AsaresultIputonsuchmuchweightthatIfounddifficulttoclimbthestairs.SoIdecidedtochangemyunhealthylifestyle.Ibegantohaveabalancingandhealthydiet.Ialsotookpartinvarioussportsactivitysuchasswimmingskatingrunningorplayingbasketball.OneyearlateIbecameasfitasbefore.
30分ImadeaspeechatEtonSchoollastyear.Whenthe1wasovertheheadmasteraskedmeifIwouldvisitan2student.Anillnesshadkepttheboyhomebuthehadexpressedaninterestin3meandtheheadmasterknewitwould4muchtohim.I5.Duringthenine﹣miledrivetohishomeI6somethingsaboutMatthewwhohadamuscledisease.Whenhewasbornthe7toldhisparentshewouldnotliveto5.Hewas13andfromwhatIwastolda8fighter.Hewantedtomeetme9Iwasagold﹣medalpowerlifterandIknewabout10difficultiesandgoingformydreams. Ispentoveranhour11withMatthew.Neveroncedidhecomplain抱怨oraskWhymeHespokeaboutwinningand12andgoingforhisdreams.13heknewwhathewastalkingabout.Hedidn't14thathisclassmateshadmadefunofhimbecausehewasdifferent;hejusttalkedabouthis15forthefutureandhowonedayhewantedto16weightswithme. WhenwefinishedtalkingIwentintomysuitcaseand17outthefirstgoldmedalIwonforpowerliftingandputitaroundhis18.Itoldhimhewasmoreofa19.HelookedatitforamomentandthenreturnedittomeandsaidRickyouareachampion.You20thatmedal.SomedaywhenIgettotheOlympicsandwinmygoldmedalIwillshowittoyou. 1A.program B.performance C.procedure D.story 2A.smart B.distinguished C.energetic D.special 3A.interviewing B.approaching C.greeting D.meeting 4A.reflect B.mean C.improve D.matter 5A.agreed B.understood C.smiled D.hesitated 6A.putaside B.foundout C.turnedto D.gaveaway 7A.officials B.teachers C.doctors D.colleagues 8A.real B.hard C.helpless D.serious 9A.after B.before C.unless D.because 10A.admitting B.avoiding C.overcoming D.recognizing 11A.declaring B.chatting C.predicting D.arguing 12A.seeking B.relaxing C.succeeding D.working 13A.Bravely B.Finally C.Disappointedly D.Obviously 14A.mention B.notice C.doubt D.realize 15A.methods B.lives C.hopes D.questions 16A.lose B.support C.bear D.lift 17A.carried B.pulled C.dragged D.kicked 18A.hand B.shoulder C.neck D.head 19A.winner B.helper C.reader D.survivor 20A.adopted B.earned C.designed D.used
10分Nowadayspeoplewanttoknowyourwebsite.1Yourwebsiteisanelectronicmeetingplaceforyourfamilyfriendsandpotentiallymillionsofpeoplearoundtheworld.Bestofallyoumaynothavetospendacent.Thewebisfilledwithallkindsoffreeservicesandallittakesissometimeandcreativity.Thinkofyourhomepageasthestartingpointofyourwebsite.2Yoursitecanhaveoneormorepagesdependingonhowyoudesignit.Whilewebpagesvarygreatlyintheirdesignandcontentmostuseatraditionalmagazinelayout.Atthetopofthepageisabanner横幅.Nextcomesagreetingandshortdescriptionofthesite.Picturestextsandlinkstootherwebsitesfollow.Beforeyoustartbuildingyoursitedosomeplanning.3Nextgatherupthematerialsthatyouwanttoputonthesite.Whiletherearenorulesyouhavetofollowthereareafewthingstokeepinmind.4Ifyouwanttoomuchatthebeginningyoumaynevergetthesiteofftheground.Youcanalwaysaddtoyoursite.Lessisbetter.Mostpeopledon'tliketoreadalotoflongtextsonline.Breakitintosmallpieces.Sinceitcantakealongtimetodownloadlargefiles.Havetheright.Don'tputanymaterialonyoursiteunlessyouaresureyoucandoitlegally.5.A.Startsimply.B.Makeitcolorful.C.Drawaroughlayoutonasheetofpaper.D.Thinkaboutwhomthesiteisforandwhatyouwanttosay.E.Alwaysremembertogetthepermissionfromthewriterfirst.F.Havingawebaddressisalmostasimportantasowingastreetaddress.G.Likethetableofcontentsofabookormagazinethehomepageisthefrontdoor.
小明同学欲研究通过导体的电流跟导体电阻的关系图甲是他设计的实验电路．1在实验过程中他保持电源电压不变通过改变AB间R的电阻值测得相应的电流值如表1所示．小明分析表1中数据发现总结不出电流跟电阻的定量关系其原因是．表12小明认真反思自己的实验过程后找出了自己的错误所在并采取了正确的实验操作．你认为小明每次改变电阻后接下来的正确操作是．3正确操作实验后小明将得到的实验数据记录在表2中分析表2中的数据你能得出的结论是．表24同组的小丽同学将小明设计的电路进行了改进在AB间接入电阻箱来代替定值电阻．如图乙所示你认为这样做的好处是．
如图所示一束光从空气斜射向水面入射光线及法线已画出．请画出这条入射光线的反射光线和折射光线的大概位置．
8分Theregularworldpresentedtousbyourfivesenses﹣youcouldcallitreality1.0﹣isnotalwaysthemostuser﹣friendlyofplaces.Wegetlostinunfamiliarcities;wemeetpeoplewhoselanguagewedon'tunderstand.Sowhynottrytheimprovedversion:augmentedrealityARorreality2.0ARtechnologyaddscomputer﹣producedimages图象ontherealworldviaamobilephonecameraorspecialvideoglasses. EarlyformsofARarealreadyhere.WiththerightdownloadssmartphonescandeliverinformationaboutnearbyATMsandrestaurantsandotherpointsofinterest.Butthat'sjustthebeginning.Afewyearsfromnowthequantityofinformationavailablewillhaveincreasedhugely.Youwillnotonlyseethatthere'saChineserestaurantonthenextblockbutyouwillbeabletoseethemenuandreadreviewsofit. Thisiswherethenextrevolutionincomputingwilltakeplace:intheinterface界面betweentherealworldandtheinformationbroughttousviatheInternet.Imaginebubblesfloatingbeforeyoureyesfilledwithcoolinformationaboutanythingandeverythingthatyouseeinfrontofyou. Let'sjumpaheadtotenyearsfromnow.Apersontryingtofixtheircarwon'tbereadingabookwithpictures;theywillbewearingadevicethatprojectsanimated3﹣Dcomputergraphicsontotheequipmentunderrepairlabellingpartsandgivingstep﹣by﹣stepguidance. ThewindowontotheARworldcanbeasmartphoneorspecialvideoglasses.Butintenyears'timethesewillhavebeenreplacedbycontactlenses隐形眼镜withtinyLEDswhichpresentsomethingatareadabledistanceinfrontoftheeye.Soadeafpersonwearingtheselenseswillbeabletoseewhatpeoplearesaying. Thequestioniswhileweareallabsorbedinournewaugmentedrealityworldshowwillwebecommunicatingwitheachother 1Whatdoesthetextmainlytalkabout A.Thenextinformationtechnologyrevolution. B.Earlyformsofaugmentedrealitytechnology. C.Thedifferencesbetweenreality1.0andreality2.0. D.Therelationshipbetweenpeoplelivinginreality2.0. 2WhatdoestheunderlinedworditrefertoinParagraph2 A.Themenu. B.Theblock. C.Therevolution. D.Therestaurant. 3WhataretinyLEDsusedtodo A.Protectpeople'seyes. B.Showtextandimages. C.Warnusersofdangers. D.Replacevideoglasses. 4What'stheauthor'sattitudetowardsARtechnology A.Doubtful. B.Disapproving. C.Favourable. D.Ambiguous.
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