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在△ABC中,三内角A、B、C对应的边分别为a、b、c,且acosB+bcosA=2cosC,c=1,则角C=( )
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高三下学期数学《》真题及答案
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,
,
所对的边分别为a,b,c,若三边的长为连续的三个正整数,且A.>B.>C.,3b=20acosA,则sinA∶sinB∶sinC为 A.4∶3∶2 B.5∶6∶7C.5∶4∶3
6∶5∶4
设△ABC的内角A.B.C.所对的边分别为abc且acosC.+c=b.1求角A.的大小2若a=1求
设△ABC的内角
,
,
所对的边分别为a,b,c,且
,a+b=12,则△ABC面积的最大值为( ) A.8B.9C.16
21
在△ABC中三内角ABC对应的边分别为abc且c=1acosB+bcosA=2cosC设h是边AB上
在△ABC中三边分别为AB=3BC=4AC=6则△ABC三边依次对应高的比为____________
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4:3:2
5:6:7
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6:5:4
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Goingtouniversityissupposedtobeamind﹣broadeningexperience.Thatassumptionispossiblymadeincontrasttotrainingforworkstraightafterschool.Butisitactuallytrue?JessikaGolleoftheUniversityofTubingenGermanythoughtshewouldtrytofindout.Herresulthoweverisnotquitewhatmightbeexpected.Itshowsthatthosewhohavebeentouniversitydoindeedseemtoleavewithbroaderandmoreinquiringmindsthanthosewhohavespenttheirimmediatepost﹣schoolyearsinvocationaltrainingforwork.Howeveritisnotthecasethatuniversitybroadensminds.Ratherworkseemstonarrowthem.Afterstudyingtheearlycareerof2095GermanyoungstersDr.Gollereachedtheconclusion.DuringtheperiodunderinvestigationGermanyhadthreetracksinitsschools:alowoneforpupilswhowouldmostprobablyleaveschoolearlyandentervocationaltraining;ahighoneforthosealmostcertaintoenteruniversity;andanintermediateonefromwhichtherewasachoicebetweentheacademicandvocationalroutes.Theteamusedtwostandardizedteststoassesstheirvolunteers.Onewasofpersonalitytraitsandtheotherofattitudes.Theyadministeredbothteststwice﹣oncetowardstheendofeachvolunteer'stimeatschoolandthenagainsixyearslater.Oftheoriginalgroup382wereontheintermediatetrackanditwasonthesethattheresearchersfocused.Ofthem212wenttouniversityandtheremaining170chosenforvocationaltrainingandajob.WhenitcametothesecondroundoftestsDrGollefoundthatthepersonalitiesofthosewhohadgonetouniversityhadnotapparentlychanged.Thosewhohadundergonevocationaltrainingandthengotjobswerenotthatmuchchangedinpersonalityeither﹣exceptinonecrucialrespect﹣theyhadbecomemoreresponsible.Thatsoundslikeagoodthingcomparedwiththecommonpublicimageofundergraduatesasabunchofpamperedlayabouts娇生惯养的闲人.Butchangesinattitudetheresearchersrecordedweremoreworrying.Intheuniversitygroupagainnoneweredetectable.Butthosewhohadchosenthevocationalrouteshowedmarkeddropsininterestintasksthatareinvestigativeandenterprisinginnature.Andthatmightrestricttheirchoiceofcareers.Someinvestigativeandenterprisingjobssuchasscientificresearchareindeedofflimitstothedegreeless.ButmanyparticularlyinGermanywithitstraditionofvocationaltrainingarenot.Theresearchersmentionforexamplecomputerprogrammersfinance﹣sectorworkersandentrepreneursascareersrequiringtheseattributes.IfDrGolleiscorrectandchangesinattitudebroughtaboutbytheverytrainingGermanypridesitselfonarenarrowingpeople'schoicesthatisindeedamatterofconcern.1Comparedwithstudentsgoingtouniversitythosechoosingthevocationalroute.A.showmorechangesintheirattitudesB.finditmoredifficulttolandsuitablejobsC.aremoreinterestedintasksrelatedtoscienceD.aremoreresponsibleanddotheirworkbetter2Theunderlinedword'detectable'inPara.9canbereplacedby.A.desirableB.predictableC.noticeableD.changeable3WhichofthefollowingisTRUEaccordingtothepassage?A.Universitygraduatesdon'tneedtoreceivetrainingatall.B.Germanyshouldchangethetraditionofvocationaltraining.C.Peoplewithoutadegreemayfindalimittotheirchoicesofcareers.D.Incomparisonwithvocationaltraininguniversitiescangreatlybroadenpeople'sminds.4Inwhichcolumnofamagazinecanyoufindthepassage?A.Science.B.Culture.C.Economy.D.Education.
﹣ThesewinterdaysaregettingtobemorethanIcantake. ﹣Holdon.Accordingtotheweatherreportpeoplehavesomereliefbytheendoftheweek. A.would B.should C.need D.shall
1AccordingtotheadvertisementLondonZoo. A.providesanidealplaceforfamiiestoholdtalksinanrainforest. B.combinesentertainmentandinteractiveexperienceswithcreatures. C.offersunlimitedaccesstopremierattractionswithalittlemorecharge. D.caterstothecuriosityofchidlrenwithguidedexplorationandinteractions. 2Itcanbelearnedfromthepassagethat. A.visitorswillbeadmittedtothezooattheirconvenience. B.driversshallgetparkingspacewithapaidentryticket. C.latecomersmaymisssomeoftheanimalexhibits. D.wheelchairuserscanhaveaccesstoanybuilding.
Thegirlwasthenhitasecondtimebyanothervananelderlytrashcollectorcametoheraidaccordingtosomewitnesses. A.before B.where C.until D.when
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