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sin20°cos40°﹣cos160°sin40°＝（ ）
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高一下学期数学《》真题及答案
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如图某广场一灯柱AB被一钢缆CD固定CD与地面成40°夹角且CB=5米 若AD=
cos20°sin40°+sin20°sin50°等于
sin20°
cos20°
东西两炮台AB相距2km同时发现入侵敌舰C炮台A测得敌舰C在它的南偏东50°的方向炮台B测得敌舰C在
如图1是小志同学书桌上的一个电子相框将其侧面抽象为如图2所示的几何图形已知BC=BD=15cm∠CB
如图1是小志同学书桌上的一个电子相框将其侧面抽象为如图2所示的几何图形已知BC=BD=15cm∠CB
观察①sin210°＋cos240°＋sin10°cos40°＝②sin26°＋cos236°＋si
用β=40°的探头探测T=30mm的对接焊缝仪器按声程11调节扫描速度探伤中在示波屏水平刻度60处出
如图1是小志同学书桌上的一个电子相框将其侧面抽象为如图2所示的几何图形已知BC＝BD＝15cm∠CB
sin110°cos40°—sin20°sin40°等于
－
－
在Rt△ABC中∠C为直角∠A=40°c=10解这个三角形．结果保留一位小数sin40°≈0.64c
求sin210°＋cos240°＋sin10°cos40°的值.
某商场准备改善原有楼梯的安全性能把倾斜角由原来的40º减至35º.已知原楼梯AB长为5m调整后的楼梯
cos40°cos160°+sin40°sin20°=
﹣
﹣
将一块直径是10cm的量角器如图放置点
与180°刻度重合，点
与0°刻度重合，角的另一边与40°刻度重合（点
），则AC等于（ ）cm。 （参考数据：sin40°≈ 0.643，cos40°≈ 0.766，sin70°≈ 0.940，cos70°≈0.342 ）。 A. 6.43B. 7.66C. 9.40
3.42
已知锐角α的终边上一点P.sin40°1＋cos40°则锐角α等于
80°
70°
20°
10°
下列各式的大小关系正确的是
sin11°＞sin168°
sin194°＜cos160°
cos（﹣
）＞cos
tan（﹣
）＜tan（﹣
）
如图是一辆小汽车与墙平行停放的平面示意图汽车靠墙一侧与墙MN平行且距离为0.8米已知小汽车车门宽AO
如图1是小志同学书桌上的一个电子相框将其侧面抽象为如图2所示的几何图形已知BC=BD=15cm∠CB
cos20°sin40°+sin20°sin140°等于
sin20°
cos20°
在Rt△ABC中∠C为直角∠A=40°c=10解这个三角形．结果保留一位小数sin40°≈0.64c
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sin＝
Iteachatauniversityandrecentlyhadaninterestinginteractionwithastudentwhoapproachedmydeskwithanassignment.Iwatchedashe1itfromhispocketandheldthecrumpled皱皮sheetouttome. What'sthat?Iasked.His2:Mywork. Iwasshocked.AllIcoulddowasstareatitlongenoughto3myvoice.ThenItoldhimtoredothe4andhanditbacktomeasaclean5andspotlesscopy.Asthestudent6Ipickedupthemerestanger. IfIhavesome7asateacherthenthisisit:quality.Inthelong8ofmyteachingcareerIhavegivenmystudentsgreatcreativefreedomand9manyextensionsofdeadlines.Butmy10ofqualityremainsanchoredinconcrete.IhavealwaysfeltthatshouldI11onthisoneessentialissuethenallislost. Sowhatbecameofmy12withthecrumpledpaper?Hegavemethepaperlikeasoldierpresentingsomethingtoaking13acatwhichiswhyI14him.Icalledhimback.WesatdowntogetherandI15hisdraftwhichwasdisorganized.Iexplained16.andclearlythatone'sfirsteffortisexactlythat:astart.Andwetookitfromtheremovingaparagraphdeletingthe17wordorsentenceand18grammar. Oncethosebasicthingswere19mystudentaskedArewedone?NotyetIsmiled.Onelaststep.Itoldhimtoreadhisworkoutloudandlistentohiswords.Afterhe20heloweredthepaperandlookedatmewithhisexpressionfilledwithhope. 1A.ruined B.pulled C.blocked D.harvested 2A.belief B.solution C.notice D.response 3A.repair B.recover C.raise D.recognize 4Aarrangement B.preparation C.adaptation D.assignment 5A.explicit B.flat C.long D.sharp 6A.twisted B.registered C.withdrew D.deposited 7A.complaint B.celebration C.appreciation D.attraction 8A.lesson B.distance C.course D.silence 9A.excused B.prohibited C.required D.allowed 10A.expectation B.assumption C.comprehension D.judgement 11A.burstout Bcutdown C.givein D.keepup 12A.career B.teacher C.draft D.student 13A.ratherthan B.orrather C.otherthan D.aswellas 14A.forgave B.scolded C.troubled D.influenced 15A.torn B.introduced C.examined D.selected 16Ahopefully B.specially C.strangely D.quietly 17A.difficult B.unnecessary C.valuable D.unconditional 18A.copying B.stressing C.correcting D.reviewing 19A.handled B.listed C.enjoyed D.tested 20A.demanded B.finished C.recorded D.settled
Ourteacherstriedteachingusaboutdeathduringnursingtraining.AsastudentnurseIknewIwouldseedeathinmy1.Ihadnoideaofthe2itwouldhaveonme3. ThefirstpersonIsawdiewasanelderlymanJohnwhohadbeen4forweeks.Hisheartwas5andthehealth﹣careteamwaskeepinghimcomfortableand6hissymptoms.Hehadstoppedspeakingdaysbeforebutwasstillawakeattimesandhis7whenwespoketohimwasbeautiful. WhenIcameontothe8onemorningthenightstaffsaidhehaddeteriorated恶化overnightandhad9lefttoleave.AtrainednurseandIgavehimabedbathshavedhimandchangedhissheets.ForthenextsixhoursI10hishandandtalkedtohim.Thedoctorcameinregularlyandaskedifheneededmorepainreliefbutheseemed11mostofthetime.Heonly12openedhiseyestosmileatme.Earlyintheafternoonthenursecamebackinandwewashedhisfaceand13hishair.Asshewasjustabouttoleavetheroomshestrokedhishairandsaid:OhJohnjust14.Minuteslaterhedid. Ithasbeen20yearssinceJohn'sdeath.Ihaveseen15deathsinmytimenursing.Ihaveseenstaffgofarbeyondthe16oftheirjobsto17thatapatienthasasgoodadeathaspossible.Iremembersomeoftheotherfacesbutnoneisquiteas18asJohn's.Heandtheprofessionalswhowere19himtaughtmethatit20howwetreatthosewhoaredying. 1A.life B.career C.mind D.family 2A.impact B.difference C.reflection D.affection 3A.instead B.regardless C.therefore D.however 4A.insisting B.challenging C.struggling D.recovering 5A.striking B.failing C.beating D.aging 6A.comforting B.decreasing C.disappearing D.relieving 7A.face B.eyes C.smile D.expression 8A.ward B.classroom C.hospital D.department 9A.days B.hours C.minutes D.seconds 10A.held B.reached C.hugged D.touched 11A.silent B.painful C.peaceful D.anxious 12A.frequently B.occasionally C.hardly D.easily 13A.combed B.tied C.washed D.smelt 14A.comeon B.passaway C.letgo D.goaway 15A.priceless B.constant C.considerate D.countless 16A.qualifications B.ability C.expectations D.exception 17A.pretend B.assume C.believe D.ensure 18A.beautiful B.vivid C.pale D.scary 19A.caringfor B.lookingfor C.bringingup D.cheeringup 20A.trains B.works C.influences D.matters
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IfyouliveinWashingtonD.C.orRedwoodCalif.youmayhaveglimpsedasmallboxyrobotrollingalongalocalsidewalkmindingit'sownbusinessbutattractingtheattentionofmanyacuriousonlooker.TheautonomousmachineswerepartofapilotprogramlastyearbyStarshipTechnologiesfocusedondeliveringmealsfromlocalrestaurantsindozensofcitiesaroundtheworld. TodaymorethaneverpeopleleadabusyanddiverselifeLexBayerStarship'sCEOsaidinastatementonline.Thehassleofneedingtorearrangeyourlifeforadeliverywillbecomeathingofthepast.Youdon'thavetoswitchyourworkingfromhomedayreschedulemeetingsvisitalockerdrivetoapostofficeorcontactadeliverymanallbecauseofamisseddelivery. Thepackagedeliveryserviceisnotavailabletoeveryonejustyet.Thecompanysaidit'srollingouttheserviceinMiltonKeynesEngland.Thewheeledrobotshaveatopspeedof4mphandcandetectobstaclesfromasfaras30feetaway.TherobotcanoperatethroughjustaboutanythingNickHandrickheadofoperationsforStarship'sD.C.officetoldTheWashingtonPost'sMauraJudkislastyear.Ifyouhadsomethingintheway﹣astick﹣it'sabletoclimbtheedgesofaroad. BygivingcustomerscontrolofwhendeliveriesoccurStarshipTechnologiesisofferingitsserviceasawaytobattlepackagetheft.InitsannouncementthecompanycitedstatisticsfromaWakefieldResearchPollforComcastlastyearthatfoundthat3in10Americanswholiveinhousesortownhouseshavehadpackagesstolen. Tosignupfortheservicewhichcostsalittlemorethan$10permonthcustomersneedtodownloadthecompany'sapp.CustomersthencreateaStarshipDeliveryAddressauniqueaddressinsideaStarshipfacilityinsteadofaresidencewheretheycanhavepackagessentfromplacessuchasAmazon.comOnceapackageisdeliveredtotheStarshipaddresscustomersreceiveatextthatallowsthemtoscheduleahomedeliveryviarobot. 1Whichcanbestreplacetheunderlinedwordhassleinparagraph2? A.failure B.expectation C.safety D.trouble 2Whatproblemisthedeliveryrobotfacing? A.Thereisalimittoitsservicearea. B.Ittakeslongertodeliverpackages. C.Itcoversashortdistanceeachtime. D.Itcan'tsensethebarriers20feetaway. 3Howdoesthepackagebyarobotavoidbeingstolen? A.Thecompanyshortensthedeliveryhour. B.Thepackageisdeliveredtothehousedirectly. C.Itsdeliverytimeisinthecontrolofcustomers. D.Thecustomersareinformedofitsdeliverytimeinadvance. 4WhatcanbeinferredaboutStarshipDeliveryAddressinthelastparagraph? A.Itisarealhomeaddressofthecustomers. B.Itcanarrangedeliveryrobotsforthecustomers. C.Itisacheapersolutiontothedeliveryofpackages. D.Itsendsthepackagesmainlytosomeshoppingplatforms.
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设ABC是平面内共线的三个不同的点点O是ABC所在直线外任意﹣点且满足若点C在线段AB的延长线上则
下列关于平面向量的说法中不正确的是
IntheUKwethrowawayabout2.5billiondisposable一次性的coffeecupseveryyear.Thebedthingisthelayerofpolyethylenethatdoesn'tletthecupleakandthelidwhichismostoftenmadeofpolystyrene.Thismakesthemabitofabarrier.Asaresultmostofthecupsendupinlandfillthoughtheyarerecyclableintheory. Butthereareeffortsunderwaytosettlethisproblem.OnecompanyBiomeBioplasticshascomeupwithafullyrecyclablecupthatusesnaturalmaterialssuchaspotatopowder.Mr.Minesitsgeneralmanagerbelievesthatthisisthefirsttimethatbioplastichasbeenusedfordisposablecupsandlidsthathavetodealwithhotliquid.Andthey'restillfullyrecyclable.AnothersolutionhasbeenputforwardbyFrugalpac.Theyhavepatentedacupwithalightly﹣attached一lacticinn.一layer.ThiscanbeeasilyseparatedduringtherecyclingandoffersamorepracticalsolutionthanchangingourcurrentrecyclinghabitssaysFrugal﹣pac'sfounderMartinMyerscough. SafiaQureshisaysIndiahasprovidedtheinspirationforhersolution.SheputsforwardthatweusereturnableandreusablecupswhicharetrackedandcollectedbyhercompanyCupClub.Theywillberesponsibleforcollectingwashingandredistributingthecleancupstoparticipatingtradesmen.OnefinalcreativeapproachcomesfromCupffee.Theyhavecombinedgrainstoformacupwhichcanbeconsumedoncethedrinkisfinished.Itcanholdacoffeeforupto40minutesandwillbiodegrade生物降解withinweeks. Whetheranyoftheseideasisaperfectfitforthisdisposableproblemonlytimewilltell.Allitmayrequireisalittlemorethinkingoutsidethebox. 1WhatdoweknowaboutthedisposablecoffeecupsintheUK? A.Fewarerecycled. B.Theyarestronglydesigned. C.Theyhavequalityproblems. D.Mostareenvironmentallyfriendly. 2WhatcanweinferaboutFrugalpac'scus? A.Theyareeasytopatent. B.Theyarepartlyrecyclable. C.Theyenjoygreatpopularity. D.Theysuittraditionalrecyclinghabits. 3InwhatwayareCupffee'scupsdifferentfromothers? A.Theyaretime﹣consumingtoproduce. B.Theycanbreakdowninstantly. C.Theyaretoeveryone'staste. D.Theycanbeeatable. 4Whatcanbeasuitabletitleforthetext? A.BadHabitsofUsingCoffeeCups B.ProblemwithCurrentCoffeeCups C.CreativeWaystoRecycleCoffeeCups D.ReasonsforProducingNew﹣styleCoffeeCups
要得到函数y＝sin2x的图象只需将函数y＝sin2x﹣的图象
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sin20° cos20°
）＞cos
tan（﹣
）＜tan（﹣
）
sin20° cos20°
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