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某玻璃三棱镜的截面如图所示，其折射率为，该三棱镜的AB边竖直放置，水平虚线CD垂直AB，∠BAC＝60°，∠B＝45°AC边长为10cm，AD部分贴着不透光的纸，当一束水平单色光照射在三棱镜AB边上...
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高三下学期物理《》真题及答案
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如图所示一个折射率为的三棱镜的截面为等腰直角△ABC∠A.为直角此截面所在平面内的一束光线沿与AB边
如图所示一条光线从空气垂直射到直角玻璃三棱镜的界面AB上棱镜材料的折射率为1.414这条光线从BC边
90 º
60 º
30º
45º
如图所示真空中的三棱镜横截面是等腰直角三角形∠A=90°平行于底面BC的入射光从AB面进入三棱镜经A
如图所示△ABC为等腰直角三棱镜的横截面∠C.=90°一束激光a沿平行于AB边射入棱镜经一次折射后射
如图所示从点光源S.发出的一细束白光以一定的角度入射到三棱镜的表面经过三棱镜的折射后发生色散现象在光
a侧是红色光，b侧是紫色光
在真空中a侧光的波长小于b侧光的波长
三棱镜对a侧光的折射率大于对b侧光的折射率
在三棱镜中a侧光的传播速率大于b侧光的传播 速率
如图所示一个横截面为直角三角形的三棱镜ÐA.=30°ÐC.＝90°.三棱镜材料的折射率是n=一条与B
如图所示三棱镜的顶角是30°光线与AB面成90°射入由AC面射出测得偏向角是30°该三棱镜的折射率是
如图所示等腰直角三角形ABC为一个三棱镜的截面折射率为nn>1.5直角边AB的长为a.一束很细的单色
如图所示某同学为了测量截面为正三角形的三棱镜玻璃折射率先在白纸上放好三棱镜在棱镜的左侧插上两枚大头针
某玻璃三棱镜的截面如图所示其折射率为该三棱镜的AB边竖直放置水平虚线CD垂直AB∠BAC＝60°∠B
如图三棱镜的横截面为直角三角形ABC∠A.=30°∠B.=60°.一束平行于AC边的光线自AB边的P
如图所示某同学为了测量截面为正三角形的三棱镜玻璃折射率先在白纸上放好三棱镜在棱镜的左侧插上两枚大头针
直角等腰玻璃三棱镜ABC的截面如图所示∠ABC=∠ACB=45°一条单色光线从腰AB上的D.点射入三
如图所示某同学为了测量截面为正三角形的三棱镜玻璃折射率先在白纸上放好三棱镜在棱镜的左侧插上两枚大头针
如图所示直角三棱镜∠ACB＝30°玻璃的折射率为1.5一束单色光从AB边的中点垂直AB射入棱镜AB边
如图三棱镜的横截面为直角三角形ABC∠A.=30°∠B.=60°一束平行于AC边的光线自AB边的p点
如图所示△ABC为等腰直角三棱镜的横截面∠C.=90°一束激光a沿平行于AB边射入棱镜经一次折射后射
如图所示一等腰直角三棱镜放在真空中斜边BC=d一束单色光以60°的入射角从AB侧面的中点入射折射后从
等腰三棱镜的顶角是30°一束光线从棱镜左侧垂直于棱镜射入折射光路如图所示求①三棱镜的折射率n②光在玻
如图所示某同学为了测量截面为正三角形的三棱镜玻璃折射率先在白纸上放好三棱镜在棱镜的左侧插上两枚大头针
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Youmayhavegrownuplivingwithsistersandbrothersorthismaybeyourfirsttimesharingyourlivingspacewithsomeoneelse.1Howeveritcanalsobeagreatpartofyourcollegeexperience.Followthesetipstomakesureyouandyourroommatekeepthingspleasantandsupportivethroughouttheyear. Beclearfromthebeginning. Maybeyouhateitwhensomeoneinterruptsyouwhenyouaresleepingeverymorning.Maybeyouneedtenminutestoyourselfbeforetalkingtoanyoneafteryouwakeup.2It'snotfairtoexpecthimorhertopickuponthemrightawayandcommunicatingwhatyouneedisoneofthebestwaystogetridofproblemsbeforetheybecomeproblems. 3 Thismayseemsimplebutit'sprobablyoneofthebiggestreasonswhyroommatesexperienceconflicts.Don'tyouthinkhe'llmindifyouborrowhisshoesforaquicksoccergame?Forallyouknowyoujuststeppedoveranuncrossableline.Don'tborrowuseortakeanythingwithoutgettingpermissionfirst. Beopentochange. Youshouldexpecttolearnandgrowandchangeduringyourtimeatschool.4Asthetermprogressesrealizethingswillchangeforbothofyou.Becomfortableaddressingthingsthatunexpectedlycomeupsettingnewrulesandbeingflexibletoyourchangingenvironment. FollowtheGoldenRule. 5Nomatterwhatyourrelationshipisattheendoftheyearyoucantakecomfortknowingyouactedlikeanadultandtreatedyourroommatewithrespect.
圆ρ＝5cosθ﹣5sinθ的圆心坐标是
Homelessnessisabigproblemacrosstheworld.Manypeopleandorganizationsareworkingtosolveit.MelYoungfromScotlandandHaraldSchmiedfromAustriaaretwosuchpeople.In2001thetwomenattendedaninternationalconferenceabouttheproblemofhomelessness.Latertheybegantowonderiffootballcouldhelpsolvetheproblem.In2003theydecidedtostarttheHomelessWorldCuporganization.Itchoosesandtrainslocalhomelesspeoplefortheyearlyfootballcompetition.Todayabout500peoplefromalmost50countriesplayintheHomelessWorldCup.Andtheprogramischanginglives. DamienisfromIreland.Formanyyearshestruggledwithdrug毒品addiction.Butin2006heplayedforIreland'sHomelessWorldCupteamandsincethenhehasbeendrugfree! ManyoftheHomelessWordCupplayerslikeDamienhavestruggledwithdrugaddiction.Howeversomeplayersarehomelessbecauseofpoverty.Alexisoneofthem.HesaysIwasborninMatharethebiggestworstslum贫民窟inKenya.Icouldnotfindanythingtoeat.Alsoschoolingwasaproblem.MylifestartedwhenIstartedplayingfootball.FootballgaveAlexjoy.Ittaughthimtoworkhardandhelpedhimbelievethathecouldachievesomething. Footballcanevenhelppeoplewhohaveexperiencedextremetragedy.NajibayoungmanfromAfghanistanhaslivedthroughmuchwar.Manyofhisfamilymembershavedied.Butfootballhashelpedhimsurvive.ItisonlyduringthegamesthatIdonotthinkaboutmysituation.I'mnotinterestedinanythingotherthanfootballandit'stheonlythingIdesireNajibexplains. Drugspovertyandwararecommoncausesofhomelessness.Playinginafootballcompetitionmaynotdirectlytreatdrugaddictionsolvepovertyorendwarbutitcangivepeopleemotionalstrengthandhelpthemlearnimportantlifeskills. 1WhatdoweknowabouttheHomelessWorldCup? A.Itisheldeveryyear. B.Itfirsttookplacein2001. C.Itistheideaoftwotroubledfootballlovers. D.Itwasintroducedataninternationalconference. 2AfterplayingintheHomelessWorldCupAlex. A.gaveuptakingdrugs B.begantolivearichlife C.gotagoodschooleducation D.becameconfidentaboutthefuture 3WhatdoestheunderlinedworddesireinParagraph4probablymean? A.Remember B.Watch C.Want D.Create 4Whatwouldbethebesttitleforthistext? A.Footballforeveryone B.Lasthopeforthehomeless C.Endhomelessnessfromnowon D.Beathomelessnessthroughfootball
7.5分VisitorstoBritainmayfindthebestplacetosamplelocalcultureisinatraditionalpub.Butthesefriendlypubscanbedangerousplacesofpotentialgaffes失礼forthenewcomers. AteamofresearchershavediscoveredsomeoftheunknowncustomsofBritishpub﹣startingwiththedifficultyofgettingadrink.Mostpubshavenowaiters﹣youhavetogotothebartobuydrinks.AgroupofItalianyouthswaiting45minutesbeforetheyrealizedtheywouldhavetofetchtheirown.Thismaysoundinconvenientbutthereisahiddenpurpose. Pubcultureisdesignedtopromotesociabilityinasocietyknownforitsreserve.Standingatthebarforserviceallowsyoutochatwithotherswaitingtobeserved.ThebarcounterispossiblytheonlysiteintheBritishIslesinwhichfriendlyconversationwithstrangersisconsideredentirelysuitableandreallyquitenormalbehavior.Ifyouhaven'tbeentoapubyouhaven'tbeentoBritain.ThistipcanbefoundinabookletPassporttothePubTheTourists'GuidetoPubEtiquetteacustomers'ruleofconductforthosewantingtosampleacentralpartofBritishlifeandculture. Thetroubleisthatifyoudonotfollowthelocalrulestheexperiencemayfallflat.Forexampleifyouareinabiggroupitisbestifonlyoneortwopeoplegotobuythedrinks.Nothingannoystheregularcustomersandbarstaffmorethanagroupofstrangersblockingallaccesstothebarwhiletheychatandhesitateaboutwhattoorder. 1Theunderlinedwordsampleinthefirstparagraphprobablymeans. A.taste B.experience C.test D.record 2ThecultureofpubinBritainissodevelopedto. A.encouragepeopletocommunicatewitheachother B.encouragemorepeopletoconsumedrinks C.attractmoretouriststothepubs D.formitsowncharacterofculture 3WhatdoestheauthormeanbygivingtheexampleofagroupofItalianyouthsinParagraph2? A.Britishpubsdon'talwayshavewaitersorwaitresses. B.ThereisalwaysahiddenpurposeinmostBritishpubs. C.ItisquiteconvenientforpeopletogetadrinkinBritishpubs. D.NotknowingthecustomofBritishpubsmaycauseinconvenience.
7.5分GivenachoicewouldThreeLittleRobotsbeingchasedbyabigbadwolfAbuildsuccessivelymorewolf﹣resistanthousesorBkillthewolfwiththeirnailgun?IfyouchoseByouareprobablyarobotwhohasn'tyetmetQuixotealearningsystemthatteachesrobotshownottokillbyusingfairytales. WhileStephenHawkingElonMuskandBillGatestrytoscareuswithtalesofrobotskillinghumansateamofresearchersatGeorgiaInstituteofTechnologyisscaringrobotsbyusingfairytalestoteachthemhowtomakeproperdecisionswhenfacedwithreal﹣worlddilemmaswhilelackingamoral道德的compass.Theysuggestrobotscanbetaughtmoralbehaviorusingbooks.Readingfairytalesorstoriescanhelpthemlearnwhatisgoodandbadandhowtobehavewellinasociety. Fables寓言fromvariousculturescanprovideartificialintelligencewithsocialskillsandrolemodelsessentialtothepeacefulcoexistenceofmenandrobotsscientistatGeorgiaInstituteofTechnologyclaiminanewstudy. Accordingtoresearcherstomakearobotunderstandtheactionsofahumanitmustfirstturnedthemorallessonscontainedinfablesintoaspeciallydesignedarchitectureofareasoningcompatiblewithartificialintelligence. AnearlyexampleofthisreasoningisasystemcalledQuixotenamedfortheleadingcharacterofMigueldeCervantes'classicnovel.Quixoteusesfableplotstogivemachineintelligenceguidanceformoralproblem﹣solvinganddependingonwhatdeedscharactersengageinthesystemsendseitherrewardorpunishmentsignalscausingrobotstoactmorehumanelyresearcherssuggest. ThefunctionofQuixoteisdependentuponanothersystemcalledScheherazadeapreviousprojectstartedbythesameteam.ScheherazadecollectsdifferentstoryplotsfromInternetanddevelopsinteractivestories.Thosestoriesarethenturnedintodecisionflow﹣chartsprovidingahugenumberofbranchingpathsfollowingeverysteptaken. Quixoteisintheearlydevelopmentstageaccordingtoresearchersnotingthatitworkscurrentlywithrobotsthatinteractwithhumansinonlyaverysmallrangeoffunction. 1Whatcanweinferfromparagraph1? A.Robotsareafraidofwolves. B.Robotsarefondoffairytales. C.Robotsareadvancing. D.Robotsareconstantlygivenchoices. 2Whatshouldprobablyhappenifatestedrobotchosetocutinlineinpublicplaces? A.ItwouldbepunishedbyScheherazade. B.Itwouldapologize. C.Itwouldreasonwithhumanbeings. D.Itwouldberebuilt. 3WhichofthefollowingbestdescribethefunctionofQuixote? A.QuixotemakesfablesmeaningfultoA.L. B.Quixotegivesrobotsintelligence. C.QuixotecollectsstoriesfromInternet. D.Quixoteisanindependentsystem.
雷达图RadarChart又可称为戴布拉图蜘蛛网图SpiderChart是财务分析报表的一种现可用于对研究对象的多维分析如图为甲乙两人五个方面的数据雷达图则下列说法不正确的是
已知点27在幂函数fx＝t﹣2xa的图象上则t+a＝
用反证法证明命题三角形的内角至少有一个角不大于60°时应假设
AsfewerpeoplechoosetomakesugarpaintingsthetraditionalChinesefolkcraftmighthavebecomea1distancememoryinsomeways.Howevera38﹣year﹣oldcraftsmanLiJianzhongisdevotedto2keeptheartofsugarpaintingalive. Liworkedasaminerformorethantenyears.After3minecloseddownLiturned4housingdecorationuntilhe5forcetogivethatupduetoafingerinjury.Earlierthisyearhediscoveredsugarpaintingsomethinghereallyhadaninterestin. Sincetherewasnosugarpaintingcraftsmaninhisvillagehestudiedby6hethroughlargequantitiesofvideosandinformationontheInternet.Lilovedpaintingwhenhewasyoungandhefounditeasytolearntheskillinsugarpainting.Hesoonmasteredtheskillandcouldmakea7varyofsugarpaintingsthusencouragingsomeofyoungpeople8followtheexampleofhim.Craftsman9normalpaintanimalsandflowersonastoneboardwiththesyrup糖浆.Whenthesugarcoolsdown10appearsisapieceofsugarart.
Fatherwasdiagnosedwithbraincancerduringthesecondhalfofmysenioryear.Itisatimewhenallthebigeventsinagirl'slifearehappening.Howeverthoughinpoorconditionfathermanagedtobepresentateveryoccasion.Hisdoctorsaidthatbyfocusingonallmyfutureeventsithelpedmydadlivelonger.Iguesssobecauseninedaysaftermyhighschoolgraduationmyfatherdied. ForthenextweekafterhisfuneralIdidn'tleavemyroomoreventoshower.FinallymymomstormedinandsaidMegangetup.Ihavesomethingforyoutoread.''Myfather'sdoctorhadsentmymotheraletter.ItcontainedthetypicalIamsorryforyourlosssentences.ButthisletterwasfarfromtypicalIcouldphysicallyseethepainthislosshadcausedhim.Inhisletterhewroteabouthowmyfatherinspiredhimtochangehislifeandthewayheworked.Heexpressedhisdesiretobecomeapersonlikemyfatherwhocaredmoreforthepeoplearoundhimandputeveryoneelsefirst. AfterIfinishedreadingitIdecidedtolivemylife.Iwentoutsideandgotajobasasummercampadvisor.Iworkedfromdawntodarkeverydaythatsummer.IgaveeverythingIhadtothekidsandslowlytheyhelpedtoheal治愈mewithoutevenrealizingwhattheyweredoing Mysummermirroredpartsofthelifemyfatherledinhislastfewdays.Ihadspentthesummermonthsgivingmyselftochildren.ItwasnottheseniorsummerIhadalwaysimagined.Itwasn'tallaboutme.Ihadlearnedthefinallessonmyfatherwasteachingmethatinordertoleadarichandhappylifeyoumustlearnhowtogiveyourselftoothers.Byhelpingthemyoureallyarehelpingyourself. 1Thedoctorsenttheauthorsmotheralettermainlyto. A.showtypicalconcernforherfamily B.encouragehertoliveahappylife C.mournherhusband'sdeath D.appreciateherhusband'sinfluenceonhim 2Whatdoweknowabouttheauthor'sseniorsummer? A.Shespentitthewayshehadalwayswanted. B.Sheworkedhardeverydaytoforgetherpain C.Shegainedquitealotwhilehelpingthekids. D.Shegotajobasherfatherhadexpected 3Whichwordcanbestdescribetheauthor'sfather? A.Selfless. B.Cautious C.Fearless D.Wise. 4Whichofthefollowingcouldbethebesttitleforthepassage? A.Dad'sfinallesson B.Myseniorsummer C.Myfather'sdeath D.Animportantletter
在直角坐标系xOy中直线l的参数方程为t为参数曲线C的参数方程为α为参数． Ⅰ已知在极坐标系与直角坐标系xOy取相同的长度单位且以原点O为极点以x轴正半轴为极轴中点P的极坐标为3判断点P与直线l位置关系 Ⅱ设点Q是曲线C上的一个动点求它到直线l的距离的最小值．
设fx＝3ax2+2bx+c若a+b+c＝0f0＞0f1＞0． 求证a＞0．
论语•学路篇中说“名不正则言不顺言不顺则事不成事不成则礼乐不兴礼乐不兴则刑罚不中刑罚不中则民无所措手足所以名不正则民无所措手足．”上述推理用的是
在吸烟与患肺病这两个分类变量的计算中下列说法正确的是
Iwearcontacts隐形眼镜.SometimesIbringmyglassestoworkasabackup备份incasemyeyestiredout.InterestinglyonthedayswhenIbroughtmyglassesIalwaysneededthem.WhenmyglassesstayedathomeIneverfelttheurgetoremovemycontacts.Backupplanslikemyglassescanhaveunexpectedinfluencesonourbehavior.Thiseffectcanbepositivebutbackupplanscanalsodestroypursuit追求ofyourgoals Buthowcanabackupplancausefailure?Imaginebeingonthejobmarket.PlanAistoworkforatechfirm.Youknowgettinghiredthereisachallengesoyou'vemadeabackupplanabankingpositionDoesyourbankingbackupplanhelporharmyourchancesofgettingajob? Therearetwokindsofbackupplans.Oneisbasedaroundapossibleemergency﹣﹣ifplanAdoesnotworkthenusePlanB.SothejobseekermightsimplysubstitutePlanBifPlanAfails.HoweverPlanBmightbeuselessifyoudon'thaveenoughtimetoprepareforthebankingpositionafterbadnewsfromthetechfirm. Theotherkindofbackupplansaredifferent.PeopletakePlanAwhileactivelycomparingPlanAandPlanB.Forourjobseekerthatwouldmeanpreparingforbothinterviewsatthesametime. Thesecondkindofbackupplansintroducegreaterchallengesandarecostliertouse.OnemustactivelycomparePlansAandBallthetime.Youcouldputsomuchworkintothebackupplanthatyoucompromiseyourchanceforsecuringtheprimarygoal.Forthejobseekeractivelycomparingthetechandbankoptionsmightresultinunder﹣preparingorbothinterviews. Sowhatmakesagoodbackupplan?Backupplanschangethewaygoalsarepursuedsometimesfortheworse.AsyouthinkaboutyourownPlanBconsiderhowitisaffectingPlanA.Forwhatit'sworthIamsittinginmyofficewhilemyglassesaresafelyathome.Risky?Perhaps.Butmyeyesfeelfresh. 1Theauthormentionedtheglassesto. A.introducethetopic B.amusethereader C.presentthebackground D.explainthephenomenon 2Whichofthefollowingisthedisadvantageofthesecondkindofbackupplan? A.PlanBmighthavealotofchallenges. B.PlanBmightcostmuchtimeandenergy. C.Jobseekersmightfallintoadilemmasituation. D.Jobseekersmaynotbewellprepared. 3Whatisthemainideaofthepassage? A.Backupplansmightbeharmful. B.Backupplansareimportant. C.Backupplansmightbeimproper. D.Backupplansareofdifferentkinds 4Theauthordevelopsthepassagemainlyby. A.listingsomeexamples B.followingthetimeorder C.comparingdifferentideas D.analyzingcausesandeffects
假定你是李华你校英文报正在举行建国70周年看生活方式变迁主题征文活动.请你根据以下要点提示投稿 1.生活方式的变化至少写两点变化 2.变化给人们带来的好处 3.你的感受. 注意词数100左右开头已为你写好不计入文章总词数 可以适当增加细节以使行文连贯. Withtheadvanceofmoderntechnologynewinventionsanddevelopmentsarerisinginourdailylife
已知集合A＝{x|lgx﹣2＜1}集合B＝{x|x2﹣2x﹣3＜0}则A∪B等于
在同一平面直角坐标系中满足由曲线x2+y2＝1变成曲线的一个伸缩变换为
已知复数z1＝在复平面内对应的点为A复数z2在复平面内对应的点为B若向量与虚轴垂直则z2的虚部为．
WantawonderfultravelinLondon?Don'tmissthefollowing! CartoonMuseum ThishighlyentertainingLondontouristattractioncoversthehistoryanddevelopmentofBritishcartoonsfromthe18thcenturytothepresentday.Youcanfindadetailedcollectionofalltypesofcartoonsinthismuseumincludingcaricatures讽刺漫画andrareexamplesofcartoonartit'sanidealplacetoentertainkidsofallagesaswellasaseriouscollectionforanimationenthusiasts. Thereareoverninehundredpiecesonexhibitandthemuseumregularlyholdseventswherebothchildrenandadultscanparticipate.BookingfortheseeventsisrecommendedduetothepopularityyearroundofthisLondonMuseum. Telephone02075808155 ChislehurstCaves ChislehurstinLondonishometochalkcavesthatwereminedbyhandforover8000years.AtourofthesecavesisanexcitingwaytoseehowBritishpeoplehaveimpactedontheirenvironmentoverthousandsofyears. Telephone02084673264 TheOldOperatingTheatreMuseum TheOldOperatingTheatreMuseumisoneLondonmuseumofferingafascinatinginsightintothemedicalprofessionofthepast.This300﹣yearoldherbgarret阁楼isBritain'sonlysurvivingoperatingtheatrewithawoodenoperatingtableandanobservationstandfromwhichvisitorscanwitnesssurgeryperformed. Telephone02071882679 CurzonMayfairCinanaMuseum RecentlyvotedoneofLondon'sbestcinemasbyTimeOutreaderstheCurzonMayfaircinemaiseverythingyouwouldexpectfromthisparticularpartoftownluxurious奢华的andtasteful.Showingmostlyart﹣houseandindependentfilms.theCurzonMayfairisuniqueintheworldofLondoncinemaforitsroleinscreeningthesefilmsforindustryandpress. Telephones03333210104 1WhatcanwelearnfromtheCartoonMuseum? A.Itisdesignedonlyforkids. B.ItistheoldestcartoonmuseuminBritain. C.Visitorscantakepartintheactivitiesheldinit. D.Onemustbookthemuseuminadvancetovisitit. 2Whichwillyoucallupifyou'dliketoknowsurgeryofthepast? A.02075808155・ B.02071882679. C.03333210104. D.02084673264. 3Whichofthefollowingmayattractanaturelover? A.ChislehurstCaves. B.CartoonMuseum. C.CurzonMayfairCinemaMuseum. D.TheOldOperatingTheatreMuseum.
At200amthisFridaymorningIreceivedatextmessagefromafriendaskingifIhadanySmileCardsinSpanish.Iimmediately1thatIdidn'thaveany.HoweverIaskedherwhyshewantedthem2inSpanishandifSmileCardsinEnglishwouldbe3. Tomy4shesaidshehadbeenoneofthefewselectedbyherhighschooltogoonaservicetriptoPanama.ShewantedtosharetheconceptofSmileCardsand5. Withchildreninthevillages.Iwastotally6andexcitedwithhearingthenews!SoIdecidedtostop7andcallhertogetmoreinformationaboutherservicetrip.Shewasleavingthatsamedayatmidnight.ItoldherIwould8aboutitandletherknowbyafternoonifIcould9anyinSpanish.Nolucktillmidday. 10therewasonetranslationoftheoriginalEnglishSmileCardinSpanishonline.Carryingthe11Iheadedovertoalocalprintingshopandaskedtheemployeeifhecouldprint100SmilecardsinSpanishby600pm.Theemployeesaiditwas12togetitsincehewasworkingbyhimselfandwas13withorders.DisappointedI14theEnglishversionoftheSmileCardandexplainedmy15tohim.Evenhewasexcitedandpromisedthathe'dtryhisbesttogetthem16. Whentheclock17ninetheSpanishSmileCardswereready.ToexpressmygratitudeIbroughtsomeIndianfoodtothisemployeetothankhimforhis18.Iquicklygotinto19mycarandmyfiend'shouseandshewaspatientlystandingoutsideawaitingmy20.Wedidn'tgetachancetohaveaproperconversationbutthatwasgoodenough. 1A.believed B.imagined C.responded D.noticed 2A.specially B.universally C.frequently D.officially 3A.accurate B.acceptable C.valuable D.flexible 4A.surprise B.puzzle Cdisappointment D.amusement 5A.solution B.amazement C.curiosity D.kindness 6A.confused B.rocked C.concerned D.satisfied 7A.talking B.travelling C.discussing D.texting 8A.worry B.bargain C.enquire D.quarrel 9A.takechargeof B.search C.control D.getholdof 10AStrangely B.Fortunately C.Obviously D.Hopefully 11A.excitement B.dream C.courage D.doubt 12A.necessary B.worthwhile C.impossible D.natural 13A.pleased B.curious C.occupied D.nervous 14A.tookout B.gaveout C.madeup D.usedup 15A.identity B.situation C.concept D.difficulty 16A.designed B.decorated C.written D.printed 17A.recorded B.exposed C.struck D.shook 18A.commitment B.judgement C.encouragement D.assessment 19A.steppedforward B.heldon C.showedup D.spedoff 20Aapology B.arrival C.explanation D.participation
假定你是高一的李华得知第七届世界军人运动会the7thCISMWorldGames将于2019年10月18日至27日在中国湖北武汉举行.请写一封信申请去做志愿者volunteer内容包括 1写信目的 2个人优势 3能做的事. 注意 1词数100左右 2可以适当增加细节以使行文连贯 3申请信的开头已给出不计入字数. DearSir/Madam IamLiHuaastudentstudyinginakeymiddleschool.
下列命中①若实数a＞b则a+i＞b+i②由圆的性质类比出球的性质是合情推理③在回归直线方程＝﹣0.2x+11中当变量x每增加一个单位时变量一定减少0.2单位④相关系数r越大则两个变量相关性越强．正确的个数是
执行如图所示的程序框图如果输出的a值大于2019那么判断框内的条件为
Iamoftenaskedwhyreadingissoimportant.Icouldn'thelpbutquote引用TyrionLannisterfromthebook‘Gameofthrones'writtenbyGeorgeRRMartin.ThisconversationfollowswhenTyrionwasaskedwhyhereadssomuch Ihavearealisticgraspofmyown1andweaknesses.Mymindismy2.MybrotherhashisswordKingRoberthashiswarhammer战锤andIhavemymind…andamindneedsbooks3aswordneedsawhetstone磨石ifitistokeepthesword4.Tyriontappedtheleathercoverofthebook.That'swhyIreadso5JonSnow. ToquoteGeorgeRRMartinAreaderlivesathousandlivesbeforehedies.Themanwhoneverreadslivesonly6. Anoldfarmerlivedonafarminthemountainswithhisyounggrandson.EachmorningGrandpawasupearlysitting7thekitchentablereadinghisbook.Onedaythegrandsonasked‘Grandpa!ItrytoreadthebookjustlikeyoubutIdon't8itandwhatIdounderstandIforget9Iclosethebook.Whatgooddoesreadingthebookdo?' Thegrandfatherquietly10andrepliedTakethiscoalbasketdowntotheriverandbringmebackabasketof11. Theboydidashewastoldbutallthewater12beforehegotbacktothehouse.ThegrandfatherlaughedandsaidYou'llhavetomovealittlefasternexttimeand13himtotheriverwiththebaskettotryagain.Thistimetheboyranfasterbutagainthebasketwasemptybeforehereturnedhome.Outof14hetoldhisgrandfatherthatitwasimpossibletocarrywaterinabasketandhewenttogetabucket15.TheoldmansaidIdon'twantabucketofwaterIwantabasketofwater.You'rejustnottryinghardenoughandhewentoutthedoortowatchtheboytryagain.Atthispointtheboyknewitwas16buthewantedtoshowhisgrandfatherthatevenifheranasfastashecouldthewaterwouldleakoutbeforehegotbacktothehouse.Theboyagaindippedthebasketintotheriverandranhardbutwhenhe17hisgrandfatherthebasketwasagainempty.HesaidSeeGrandpait's18! Soyouthinkitisuseless?theoldmansaidLookatthebasket.Theboylookedatthebasketandforthefirsttimerealizedthatthebasketwas19.Ithadbeentransformedfromadirtyoldcoalbasketandwasnowcleaninsideandout. Sonthat'swhathappenswhenyoureadthebook.Youmightnotunderstandorremembereverythingbutwhenyoureadityouwillbechangedinsideand20!!! 1A.wisdom B.strengths C.shortcomings D.disadvantages 2A.tool B.weapon C.equipment D.instrument 3A.as B.before C.while D.because 4A.fast B.sharp C.smooth D.important 5A.few B.much C.little D.many 6A.it B.one C.that D.those 7A.at B.down C.along D.besides 8A.confirm B.believe C.understand D.convince 9A.quickly B.finally C.immediately D.frequently 10A.turnedup B.turnedout C.turnedaway D.turnedaround 11A.fish B.coal C.earth D.water 12A.wentout B.flewout C.droppedout D.leakedout 13A.sent B.asked C.ordered D.required 14A.breath B.control C.curiosity D.consideration 15A.even B.though C.instead D.however 16A.hopeful B.necessary C.impossible D.important 17A.heard B.arrived C.glanced D.approached 18A.useless B.hopeless C.helpless D.worthless 19A.same B.equal C.strange D.different 20A.out B.around C.anywhere D.everywhere
已知i是虚数单位且复数z满足z+23+i＝10． Ⅰ求z及z2 Ⅱ若z•a+2i是纯虚数求实数a的值．
LastsummerIwenttooneoftheworld'smostfamoushistoricalplacestheForbiddenCityinBeijingwhatwasthehomeoftheemperorsofthelasttwodynastiesintheChinatheMingandQingDynasties.Thepalacehas10.000rooms.InMandarintheForbiddenCityiscallingthePurpleForbiddenCity.Howeverthecolorofthepalacehimselfisnotpurple.ThecolorpurplestandsthepowerofthegreatemperorsofChina.Itwassoasacredplacethatcommonpeoplecouldnotevendreamofevergothere.TheemperorsalsohavesomeofthelargerfestivalcelebrationsattheForbiddenCity.NowtheForbiddenCityisknownasahistoricalsiteformillionsoftouristfromallovertheworld.
已知函数fx＝|x﹣2|． Ⅰ求不等式fx＞6﹣|2x+1|的解集 Ⅱ设ab∈2+∞若fa+b＝6求的最小值．
点M的直角坐标是则点M的极坐标为
观察下列几个三角恒等式 ①tan10°tan20°+tan20°tan60°+tan60°tan10°＝1 ②tan13°tan35°+tan35°tan42°+tan42°tan13°＝1 ③tan5°tan100°+tan100°tan﹣15°+tan﹣15°tan5°＝1． 一般的若tanαtanβtanγ均有意义你可以归纳出结论
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