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如图所示，由某种透明物质制成的直角三棱镜ABC，∠A＝30°，AB长为2m，且在AB外表面镀有水银．一束与BC面成45°角的光线从BC边的中点D射入棱镜．已知棱镜对该光的折射率，有折射光线时，则不考...
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高三下学期物理《》真题及答案
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如图所示一透明介质制成的直角三棱镜顶角∠A.＝30°一束光由真空垂直射向AC面经AB面射出后的光线偏
如图所示ABC是由折射率为的某种透明物质制成的直角三棱镜横截面O.为AB的中点∠A.=30°.一束光
如图所示为某种透明介质做成的一等腰直角三棱镜一细光束从直角边射入入射角从直角边射出三棱镜出射角求这种
如图所示一透明介质制成的直角三棱镜顶角∠A.=30°一束光由真空垂直射向AC面经AB面射出后的光线偏
如图所示由某种透光物质制成等腰直角三棱镜腰长=16cm为了测定这种物质的折射率使两腰分别与OxOy重
如图所示由某种透明物质制成的直角三棱镜ABC∠A＝30°AB长为2m且在AB外表面镀有水银．一束与B
如图所示一束光垂直射向一顶角为30°的玻璃三棱镜请在图中画出光通过三棱镜的光路图
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=.一束与
如图所示由某种透明物质制成的直角三棱镜ABC∠A＝30°AB长为2m且在AB外表面镀有水银．一束与
如图所示一束光射向一块用玻璃制成的三棱镜请画出这束光进入三棱镜和离开三棱镜后的径迹
如图所示为某种透明介质做成的一等腰直角三棱镜ABC一细光束从直角边AB射入入射角α=60°从直角边
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
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用厚度不计的玻璃制成一空气三棱镜放置于水中如图所示一束垂直侧面ac的单色光线射向空气三棱镜并从bc侧
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用乙烯甲苯E三种原料合成高分子药物M和有机中间体L的路线如图 已知 Ⅰ． Ⅱ． Ⅲ．有机物L是一种六元环酯M的分子式是C15H16O6n． 1C中含氧官能团的名称是D的结构简式是． 2H→J的反应类型是． 3H→L的化学方程式是． 4K→M属于加聚反应K的结构简式是． 5写出一定量的C与足量NaOH溶液反应的化学方程式． 6写出一种符合下列条件的C的同分异构体的结构简式． ①属于芳香族化合物②能发生银镜反应③遇FeCl3溶液能发生显色反应④核磁共振氢谱上有4组峰且峰面积之比为1122． 7已知．以CH3CH＝CH2为原料其他原料自选结合上述流程合成丙烯酸CH2＝CHCOOH写出合成路线．
HowYouOpenYourCarDoorMatterstoCyclists TheDutchReachisn'tanewdancemoveorarandomYouTubechallenge. 1Andyoumightkeepyourcardoorsafeintheprocesstoo.Allyouhavetodoischangehowyouopenyourdoor. Typicallyapersonsittinginthedriver'sseatofacaropensthedoorwiththehandclosesttoit.Itmakessensesincedoorsaredesignedtobeopenedthatway.Pullthehandleandthedoorisopen.Butifyouhappentodothatatthewrongtimeyoumayunknowinglycreateanobstacleforapassingcyclist.Thecyclistmightbeknockeddownoffthebike.2Clearlythesolutionisforthepersonexitingthevehicletocheckfortraffic.Howeverthecardoordesignandlong﹣timehabitshavemadetheprocessautomatically.3OpenyourcardoorwithyourotherhandusingtheDutchReach.Soinsteadofusingyourlefthandreachforthedoorhandlewithyourright.Thiswillforceyoutoturnyourbody.Attheveryleastyou'lllookintoyoursideviewmirrortocheckforanytraffic. 4AllDutcharetaughtit.It'spartofregulardrivereducation.Thetechniquedatesbackabout50or60yearsintheNetherlands.In2016anAmericannamedMichaelCharneystartedtheDutchReachProject.HewantedtopopularizethepracticeintheUnitedStates.Charney'seffortsmaybepayingoff.5 A.Thecardoorislikelytobedamagedbythefast﹣movingbicycle. B.TheDutchareusedtoopeningtheircardoorsthisway. C.SeveralstatesnowincludetheDutchReachintheirdrivers'handbooks. D.It'sasimplemovethatcanhelppreventharmtocyclists. E.Peoplearetryingtochangethewaytoopenthecar. F.Itiseasytodoonceyouareusedtoit. G.Luckilythere'sasimplewaytosolvetheproblem.
下列关于有机物的说法正确的是
下列运算正确的是
我国科学家在天然气脱硫研究方面取得了新进展利用如图1装置可发生反应H2S+O2═H2O2+S↓甲池中发生如图2反应．下列关于该装置工作时的说法错误的是
若执行如图所示的程序框图则输出S的值为
统计某校n名学生的某次数学同步练习成绩满分150分根据戒绩分数依次分成六组[90100[100110[110120[120130[130140[140150]得到频率分布直方图如图所示若不低于140分的人数为110则以下说法正确的是 ①m＝0.031②n＝800③100以下的人数为60④分数在区间[120140的人数占大半
Chinesehigh﹣speedrailwaysareavery.1comfortwaytotravel.Theyarecleanquietandefficient.Chinahasledotherdevelopingcountriesandevensomedevelopedonesinthisfieldsincethefirsthigh﹣speedtrain2comeintousein2008. Thestationsare3mainbuiltoutsidethetowncenterbutlocaltransporthasbeenlengthened4connectthehigh﹣speednetwork.Thefacilitiesonthetrainarenewandthestaffarewelltrained.Eventhesecondclass5chairprovideplentyofspace.Thepassagesaresowide6youcanmovewithoutdisturbinganyone.Youcanuseyourmobilephoneaccess7Internetorworkonyourlaptop.Thereisalsoarestaurantcarthoughthekindsoffood8belimited.Thetoiletsarclargecleananduser﹣friendlytoo.Thetrainalmostdoesn'trock.Evenwhenthetrainbrakesyoucanhardlyfeelitshake. What'smorewithafastercheck﹣inthehigh﹣speedtrainarealso9littleaffectedbyweatherthanplanes.Seldomare10delayedorcancelledforweathercondition.Thereforetheyhavebecomethefirstchoiceformanypassengers.
如图△ABC中AB＝AC＝5BC＝4AD平分∠BAC交BC于点D点E为AC的中点连接DE则△CDE的周长为．
如图菱形ABCD中∠BAD＝60°AC与BD交于点OE为CD延长线上的一点且CD＝DE连接BE分别交ACAD于点FG连接OGAE则下列结论 ①OG＝BD②与△EGD全等的三角形共有5个③S△ABFS△CEF＝14④由点ABDE构成的四边形是菱形． 其中正确的是
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下列装置所示的实验中能达到实验目的是
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已知如图直线MN交⊙O于AB两点AC是直径AD平分∠CAM交⊙O于D过D作DE⊥MN于E． 1求证DE是⊙O的切线 2若DE＝6cmAE＝3cm求⊙O的半径．
已知复数z＝为虚数单位则|z|＝
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如图正方形ABCD的边长为10点A的坐标为0﹣8点B在x轴上若反比例函数y＝k≠0的图象过点C则该反比例函数的表达式为
有两个可以自由转动的均匀转盘AB都被分成了3等份并在每一份内均标有数字如图所示规则如下 ①分别转动转盘其中A转盘指针对着的数字记为横坐标B转盘指针对着的数字记为纵坐标 ②两个转盘停止后观察两个指针所指份内的数字若指针停在等分线上则重转一次直到指针指向某一份内为止． 1用列表或画树状图的方法表示出上述试验所有可能的结果 2张颖和刘亮想用这两个转盘做游戏决定谁能获得唯一一张2018年昆明“南博会”的门票他们规定两个指针所得坐标在第二象限张颖获得门票两个指针所得坐标在坐标轴上刘亮获得门票．这个游戏公平吗若不公平谁获胜的可能性大
要使有意义则的取值范围是．
已知向量＝2m＝31若∥则实数m的值为
ScientistsinWesternAustraliaclaimtohavemadeanewdiscovery﹣theyhavefoundgoldintheleavesandtwigsoftrees.Theresearchersbelievethatthetreessuckupthegoldfromdeepundergroundover30metresdown.Thediscoveryhasbeendescribedasthefirstofitskindintheworld.Australiangoldexplorationcompaniesarepleasedbecauseitwillmakefindinggoldcheaper.Ratherthandrillingdeepholestofindgoldtheyhavemorewaystoexaminetreeleavesandbranches.Thereisonlyatinyamountofgoldintheleaves.Itwouldtake500treestomakeonegoldring.ThegoldisfoundusingaspecialX﹣raymachineownedbyanAustraliangovernmentagency.ApureX﹣rayandapowerfulmicroscopescantheleavesandbranches. Theclaimthatthisisthefirsttimethatgoldparticles微粒havebeenfoundinlivingmaterialmightnotbetruethough.AncientChinesewisdomunderstoodtheconnectionbetweenplantsandthepreciousstonesandmineralsunderneaththem.Theyusedplantlifetofindmineralsandthatwasthousandsofyearsago.IntheZhouDynastyitwaswritteninabookthatacertainplantgrewonlyneardepositsofgold.Overthenext2000yearsChinesepeoplewroteaboutdifferentplantsandhowtheygrewshowedwheremineralsandpreciousstonessuchasjadecopperleadsilverandgoldwere. Evenmoreimportantlyinthe1000sSuSongdescribedhowcoppergoldsilverleadandtinwereobservedandtakenfromcertainplants.Thesewereamazingscientificdiscoveries.Meanwhilethisknowledgewasunknownintherestoftheworlduntilabout1600.ThiswaswhenaBritishmanrealisedthatoaktreesgrewlargerandgreenerwheretherewasalum明矾intheground.MaybeancientChinesehasmoreknowledgetoteachmodernscientists. 1WhatcanweknowfromParagraph1? A.500deadtreescanmakeonegoldring. B.Thetreescanabsorbthegoldfromdeepunderground. C.Scientisthavefoundgold30metersbelowunderground. D.Thecompaniesfindithardtofindgold. 2Howdoscientistsfindgoldintheleaves? A.Byobservingtheleavescarefully. B.Bydrillingdeepholes. C.ByusingaspecialX﹣ray. D.Byreferringtoancientbooks. 3Whofirstdiscoveredthattherewasconnectionbetweenplantsandminerals? A.AncientChinesepeople. B.SuSong. C.Australianscientists D.ABritishman. 4Whatisthepurposeofthelastparagraph? A.Tointroducetwogreatscientistsinancienttimes. B.Toprovidemoreevidencetosupportthewriter'sopinion. C.Toshowhowancientpeoplegotgoldfromcertainplants. D.ToprovethatancientChinesehasmoreknowledgethanmodernscientists.
7.5分PeoplehavegrowntalleroverthelastcenturywithSouthKoreanwomenshootingupbymorethan20cmonaverageandIranianmengaining16.5cm.Aglobalstudylookedattheaverageheightof18﹣year﹣oldsin200countries1914and2014.TheresultsshowthatwhileSwedeswerethetallestpeopleintheworldin1914Dutchmenhaverisenfroml2thplacetoclaimtopspotwithanaverageheightof182.5cm.Larvianwomenmeanwhilerosefrom28thplacein1914tobecomethetallestintheworldacenturylaterwithanaverageheightof169.8cm.JamesBenthamaco﹣authoroftheresearchsaystheglobaltrendislikelybutonceyouaverageoverwholepopulationsgeneticsplaysalesskeyroleheadded. Butwhileheighthasincreasedaroundtheworldthetrendinmanycountriesofnorthandsub﹣SaharanAfricacausesconcernsaysElioRiboliofImperialCollege.WhileheightincreasedinUgandaandNigerduringtheearly20thcenturythetrendhasreversedinrecentyearswithheightdecreasingamong18﹣year﹣olds. Onereasonforthesedecreasesinheightistheeconomicsituationinthe1980ssaidProfessorAlexander.Thenutritionalandhealthproblemsthatfollowedthepolicyofstructuraladjustmenthesaysledtomanychildrenandteenagersfailingtoreachtheirfullpotentialintermsofheight. Benthambelievestheglobaltrendofincreasingheighthasimportantimplications.Howtallwearenowisstronglyinfluencedbytheenvironmentwegrewupinhesaid.Ifwegivechildrenthebestpossiblestartinlifenowtheywillbehealthierandmoreproductivefordecadestocome. 1WhatcanbelearnedfromParagraphI? A.Theincreaseinwomen'sheightismuchbiggerthanmen'sinthelastcentury. B.Thelastcenturyhasseenagreatincreaseinpeople'sheightinmostcountries. C.Geneticsplaysakeyroleintheincreaseofpeople'sheightinthelastcentury. D.DutchandSwedesarerankedfirstandsecondinheightintheworldnowadays. 2TheunderlinedwordreversedinParagraph2canbereplacedby. A.sloweddown. B.goneupwards. C.changedtothecontrary. D.cometolifeagain. 3AccordingtothetextJamesBenthamsuggeststhat. A.Theeconomicsituationofsomecountriesshouldbeimproved. B.Environmentprotectionshouldbeattachedgreatimportanceto. C.Theglobaltrendofincreasingheightshouldbecloselywatched. D.Children'spropernutritionandhealthcareshouldbeguaranteed.
假定你是李华你校拟组织美国交换生Chris等到泉州府文庙去参观请你写封邮件告知他活动安排.内容包括 1.集合时间和地点 2.内容参观府文庙间南古建筑观看木偶戏 3.预先准备简要了解孔子文化. 注意 1.可适当发挥使短文连贯通顺 2.文中不能出现考生的具体信息 3.词数100左右. 参考词汇1.府文庙theConfuciusTemple2.木偶戏puppetshow DearChris
如图点O是圆形纸片的圆心将这个圆形纸片按下列要求折叠使弧AB和弧BC都经过圆心O已知⊙O的半径为6则阴影部分的面积是．
Theworldisacolorfullandscapeofdifferentlanguagesskincolorsanddifferentcultures.It'simportanttohaveagoodunderstandingofdifferentculturesinordertobecomeawell﹣roundedperson1 Onewayistoreadhookswrittenbyauthorsfromaparticularculture.Readingworksbyauthorswhohaveacloserelationshipwithaparticularcultureallowspeopletogainanauthenticglimpseintothefoodmusiclanguagereligionandwayofalifeofaparticulargroupofpeople. 2 Anotherwaytolearnaboutdifferentculturesistotrytolearnaforeignlanguage.3Apersoncanchoosealanguageshehasalwayswantedtolearnandlocatelearningprogramstohelphermasterthelanguage.Besidesonecanenrollinaforeignlanguageclassinordertolearninamoreformalsetting.Onecanalsotrytovisitareasofthecitytoestablishsocialconnectionwithnativespeakersofthelanguage. 4Seekoutrestaurantsthatfeatureauthenticfoodfromavarietyofcountries.Foodisanimportantpartofdifferentculturesandallowspeopletogaindeepunderstandingintoaparticularculturalgroup'swayoflife. Communicatingwithpeoplefromothercountriesthroughemailorsnailmailisanotherusefulwaytobecomefamiliarwithdifferentcultures.5Variouswebsitesofferpenpalservicesofferingtoconnectindividualswithpenfriendsaroundtheworld. A.Storiesbasedonalocalcultureexposeonetoadifferentculture. B.Tryingauthenticfoodfromaspecificculturalgroupisalsoagreatidea. C.Thereareseveralwaystobecomeknowledgeableaboutdifferentcultures. D.Avarietyoflanguage﹣learningbookssoftwareandaudioprogramsisavailable E.TheInternethasmadeitpossibletocommunicatewithothersfromdifferentcountries. F.Makingcontactwithnativespeakersofthelanguageallowsonetogainfirsthandknowledge. G.Onewaytodevelopthisappreciationistotrytoteamaboutotherculturesaroundtheworld.
YoumaynotknowthenameJohnSmithPembertonbutyoumustknowthenameofhis1inventCoca﹣Cola. PembertonwasaUSchemist.WhenhewaswoundedintheCivilWarlieusedmedicinetocasethepainandgraduallygot2addicttoit.Tolighttheaddictionhecreatedhisowndrinkby3useleavesofcocaandnutsofkola.Henamed4Pemberton'sFrenchWineCoca.Inthesameyearthelocalgovernmentpassedabanonalcohol.Pembertonhadtochangetherecipetoremovethealcohol. In1886PembertoninvitedWillisVenabletohelphimperfecthisnewrecipe.Theyusedcarbonatedwaterandfinallyinventedanewdrink.Ithadnoalcohol5couldstilleasepainandclearthemind.Pembertondecidedtosellit6adrinkratherthanamedicine.In1887PembertonsoldpartofthestockofhiscompanytoAsaCandler7latercreatedtheCoca﹣ColaCompany. Nowadays.Coca﹣Colahasbecomeoneofthemostpopular8drinkintheworld.Thecompanyonlyofferssemi﹣finishedproductstopartnersandwon'tsellthe9originingredients成分.ItssecretrecipewaskeptintheSunTrustBankinAtlantafor86yearsuntiltheendof2011.Sincethenit10keepintheWorldofCoca﹣ColacenterinAtlanta.
Withover2.4millonvisitorseveryyearCinqueTerreisoneofthemost﹣visitedregionsinItaly.CinqueTerreistrulyspecial.Thefivecandy﹣coloredfishingvillagesofRiomaggioreManarolaComigliaVemazzaandMonterossoalMarearebuiltintocliffsoverthecleanandbrightly﹣shiningLigurianSea.Whetheryou'revisitingtheregionforafewdaysorafewweeksthesearetheexperiencesyoushouldaddtoyourtrippleasure. ★Takeascenichike. It'seasytovisiteachoftheattractivevillagesonfoot.ThemostpopularhikeisthecoastalpathSentieroAzzuro.Itlinksallfivevillagesandoffersextremelybeautifulsceneryoftheseaarchitectureandvineyards葡萄园.Ittakesaboutsixhourstogoacrosswithshortbreaksbutmostpeoplearegoingtostopinthevillagesforfoodandswimming. ★Eatseafoodinacone锥形. DessertloversmightthinkthatItalianice﹣creamisthebestthingtobeservedinaconebutmakeroomforseafoodconesaswell.ThankstoitscoastallocationCinqueTerreisfullofseafoodrestaurants. ★Getonaboat. Iftheweathercooperatestakethetimetogetoutonthewater.Thevillageslookverybeautifulfromaboat.Thecheapestandeasiestwayistojumponthepublicferryfromoneofthevillagestothenextbuttheseboatsareoftencrowded.It'sfarmorerelaxingtotakeaprivatecruisewhichdepartsfromthedocksinRiomaggioreManarolaVemazzaandMonterossoalMare. ★Takethetrain. CinqueTerre'strainsystemisoneofthemostscenicinEurope.Thehigh﹣speedtrainrunsthrougheachofthefivevillagesevery20minutesorso.AndthewholelineisdirectlyonthecoastofferinglovelyviewsoftheLigurianSeaandrockycliffs. 1Whatisspecialaboutthefivecandy﹣coloredfishingvillages? A.Theirspeciallocation. B.Theirlonghistory. C.Theirdeliciousfoods. D.Theirfriendlyvillagers. 2Whatisthefavoritefoodforthehikersinthefivevillages? A.Italiannoodles B.Italianice﹣cream. C.Italianwines. D.Seafoodcones. 3Whatisthebestwaytoenjoythebeautifulsceneryanddeliciousfood? A.Takingaprivateferrytothevillages. B.Walkingwithshortbreaksonthecoast. C.Takingascenichikealongthecoastalpath. D.Takingthetrainrunningthroughthevillages.
昆明市某中学综合实践活动棋类社团前两次购买的两种材质的围棋采购如表近期两种材质的围棋的售价一直不变1若该社团计划再采购这两种材质的围棋各5盒则需要多少元2若该社团准备购买这两种材质的围棋共50盒且要求塑料围棋的数量不多于玻璃围棋数量的3倍请设计出最省钱的购买方案并说明理由．
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