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在△ABC中,角A,B,C所对的边分别是a,b,c,且,,B=60°,则A=( )
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在△ABC中内角A.B.C.所对的边分别是abC.若b=2asinB.则角A.的大小为_______
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在△ABC中角ABC所对的边分别是abc且acosB+bcosA=﹣2ccosC.Ⅰ求角C的大小Ⅱ若
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在△ABC中角A.B.C.所对的边分别是abc若sin2B.+sin2C.=sin2A.+sinB.
在斜三角形ABC中角A.B.C.所对的边分别是abc且=﹣.Ⅰ求角A.的大小Ⅱ若求角C.的取值范围.
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在锐角△ABC中abc分别是角ABC所对的边△ABC的面积S=2且满足acosB=b1+cosA则
在△ABC中角ABC所对的边分别是abc若则△ABC的面积等于.
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在△ABC中角A.B.C所对的边分别是abc且acosC+asinC=b+c1求角A的值2若a=2求
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Shortnessofbreathhasmanydifferentcausesandthetreatmentofitisspecificforeachcause.1Therearehoweversomefollowingfirstaidstepsyoucanusetotreatitatleastuntiltheambulancearrivesoryou'reabletogetthevictimtoahospital. 2 ThemoreenergyyouspendthemoreoxygenyouuseandthemoreshortofbreathyoufeelThinkaboutagoodworkoutatthegym.Exercisehardenoughandyouwillfeelshortofbreath.Thecure?Takeabreak. Letthevictimsitstandorliewhere'sthemostcomfortable.There'relotsofmythsabouthowsomebodypositionssupposedlyprovidemoreairflow.Coachesregularlytellplayerstoholdtheirarmsabovetheirheadstomaximizechestexpansion.Nursingstaffassumethetripodpositionisthebestposition.3Useoxygen.Thisisaspecialcaseusedonlyforfolkswithchroniclungproblems.Ifthevictimhasoxygenavailablethisiswhatit'sfor.4Thevictimmayhavebeentoldbyhisorherdoctorthattoomuchoxygenfortoolongmightcausemoreproblems.Assurethevictimthatsuddenincreasesinshortnessofbreatharetheinstancesinwhichoxygenisneededmost. Treatthecauseofshortnessofbreath.5Asthmapatientsforexampleoftenhavemultipletoolsanddrugstofixsuddenshortnessofbreath.Victimsoflunginfectionsmayneedtoseeadoctorandheartattackvictimsmayneedanambulance. A.Havethevictimrest. B.Takemoreexerciseatthegym. C.Thevictimshouldusehisorheroxygenasdirectedbyadoctor. D.There'remanycausesofshortnessofbreathandmanyofthemaretreatable. E.Thevictimcantrytoavoidmakinguseofhisorheroxygenwheneverpossible. F.Everypersonisdifferenthoweversoletthevictimdecidewhatpositionfeelsmostcomfortable. G.Inmanycasestheonlywaytotreatshortnessofbreathistocall911ortakethevictimtoadoctor.
10分Identitytheftisarousingincreasingattentionfromthepublic.36Whenyouridentityisstolenthethiefoftendoesfraud诈骗withthat.Hemaygetacreditcardinyournameandspenditcarelesslywithoutpayingthebills.Hemaygetadriver'slicenseinyournameandyouwillbeheldresponsibleforthetrafficaccidentshecauses. WhyisidentitytheftbecomingSOcommon?37AndthewealthofprivatedetailspeoplepostonsocialnetworkssuchasFacebookalsomakesiteasierforidentitythievestoobtainprivateinformation. Manypeoplearenotawareoftheproblemscausedbythecrime.38 39ThisiswhyitisofimportancethateverypersonshouldbecomecautiouswhenusingtheInternet.Thefollowingtipsmaypreventyoufromidentitytheft. Firstmakesureyourcomputerhasanupdatedanti﹣virusandfirewallsysteminstalled.Second40Yourdateofbirthnamesofschoolsattendedphonenumberorthenamesofyourparentsareoftenrequiredtoverifyanidentityandthievescanusethisinformationtoo.Lastbutnotleastcreatecomplexpasswordsusingacombinationofnumbersandkeyboardsymbolsandchangeyourpasswordsonaregularbasis. A.AgatewayisofferedfortheidentitytheftbythepopularityoftheInternetandcomputers. B.Giveawayyourprivateinformationonsocialnetworkingsites谢也theutmostcaution. C.Thereisonesolutiontosolvetheproblem. D.Thisisacrimeinwhichyourprivateinformationisstolenbysomeoneandisusedinallillegalway. E.Theywakeupfromtheircarefreeattitudeonlywhentheybecomeavictimandsufferthedamagescausedbythecrime. F.Thereisnocureforidentitytheftexceptprevention. G.Theymayborrowmoneyfromthebankinyourname.
YoucanfindhundredsoffreecomedymoviesonlinesavingyoumoneyaswellasthetroubleofgoingouttorentaDVDorvisitamovietheater. Hulu'FreeComedyMovies Huluhasthebestselectionoffreecomedymoviesthatyoucanwatchonlinerightnow.Youcanlookthroughnewlyaddedcomediesorthemostpopularonesfromtodaythisweekthismonthoralltime.HulualsohasahugecollectionoffunnyfreeTVshowsandmoviesavailablebutyou'llhavetowatchadvertisementsplacedlikecommercialsthroughouttheshowsormoviesyouareviewing. FreeComediesatPopcornflix Popcornflixisalegalwebsitewhereyoucanwatchfull﹣lengthstreamingmoviesinboththeU.S.andCanada.You'llseelotofactorsandactressesyou'llrecognizehereinsomemoviesyou'veheardofandsomeyouhaven't.Youdon'tneedtoregistersoyou'llbeenjoyingyourchosenmovieorTVshowinseconds.Howeverthisvideostreamingserviceisad﹣supportedsoyouwillhavetositthroughafewcommercialbreaksduringyourmovie. FreeComedyMoviesatTubiTV ThousandsoffreemoviesandTVshowsareavailablethroughTubiTVandtheycanallbeviewedonanumberofmobiledeviceinadditiontoacomputer.There'salsoawholesectionatTubiTVthat'sjustforcomedyvideos.Somemoviesrequireyoutologintoviewthembutregistrationisfreeandonlytakesafewmoments. ClassicCinemaOnline'sComedies DozensoffreeclassiccomediesareavailablefromClassicCinemaOnline.WhatreallymakesClassicCinemauniquefromtherestisitsratherlargeselectionofsilentfilms.Whilethere'reonlyalargehandfulofmoviesatClassicCinemaOnlineifyouloveclassicandsilentmoviesyoureallyneedtocheckitout. 1WhatdoesHulu'sFreeComedyMoviesofferapartfromfreecomedymovies? A.Free﹣books. B.FunnyfreeTVshows C.Sciencefiction. D.Actionmovie 2WhatcanwelearnaboutFreeComediesatPopcornflix? A.Noregistrationisrequired. B.Itsmoviesareallpopular. C.Ithasawholesectionofcomedyvideos. D.Itsmoviescanbewatchedanywhere. 3WhatmakesClassicCinemaOnline'sComediesstandoutfromtherest? A.Dozensoffreeclassiccomedies. B.Alargeselectionofsilentfilms. C.Ratherfinevideoquality. D.Thebestselectionofmovies.
甲乙两列简谐横波在同一介质中分别沿x轴正向和负向传播波速均为v=25cm/s两列波在t=0时的波形曲线如图所示.求 it=0时介质中偏离平衡位置位移为16cm的所有质点的x坐标 ii从t=0开始介质中最早出现偏离平衡位置位移为﹣16cm的质点的时间.
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