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一半径为R的球体放置在水平面上，球体由折射率为的透明材料制成．现有一束位于过球心O的竖直平面内的光线，平行于桌面射到球体表面上，折射入球体后再从竖直表面射出，如图所示．已知入射光线与桌面的距离为R，...
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高三下学期物理《》真题及答案
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一半径为R.的1/4球体放置在水平面上球体由折射率为的透明材料制成现有一束位于过球心O.的竖直平面内
如图所示一个半径为R.的透明球体放置在水平面上一束蓝光从A.点沿水平方向射入球体后经B.点射出最后射
如图所示一半径为R的球体位于水平桌面上球体由折射率为的透明材料制成．现有一束位于过球心O的竖直平面
一半径为R.的1/4球体放置在水平面上球体由折射率为的透明材料制成现有一束位于球心O.的竖直平面内的
一半径为R.的1/4球体放置在水平面上球体由折射率为的透明材料制成现有一束位于球心O.的竖直平面内的
一半径为R.的1/4球体放置在水平桌面上球体由折射率为的透明材料制成现有一束位于过球心O.的竖直平面
一半径为R.的1/4球体放置在水平桌面上球体由折射率为的透明材料制成如图所示现有一束平行于桌面的光线
如图所示一个半径为R.的透明球体放置在水平面上一束蓝光从A.点沿水平方向射入球体后经B.点射出最后射
如图所示一个半径为R.的1/4透明球体放置在水平面上一束蓝光从A.点沿水平方向射入球体后经B.点射出
如图12所示一由透明材料制成半径为R.的球体放置在水平桌面上一水平细光束由左侧垂直射向OA所在的平面
如图所示一个透明球体放置在水平面上一束蓝光从A.点沿水平方向射入球体后经B.点射出最后射到水平面上的
如图所示一个半径为R的透明球体放置在水平面上一束蓝光从A点沿水平方向射入球体后经B点射出最后射到水
一半径为R的球体放置在水平面上球体由折射率为的透明材料制成．现有一束位于过球心O的竖直平面内的光线
一半径为R.的1/4球体放置在水平面上球体由折射率为的透明材料制成现有一束位于过球心O.的竖直平面内
一半径为R.的1/4球体放置在水平面上球体由折射率为的透明材料制成现有一束光线如图所示平行于桌面射到
一半径为R.的1/4球体放置在水平面上球体由折射率为的透明材料制成.现有一束位于过球心O.的竖直平面
一半径为R.的球体放置在水平面上球体由折射率为的透明材料制成.现有一束位于过球心O.的竖直平面内的光
一半径为R.的1/4球体放置在水平面上球体由折射率为的透明材料制成现有一束位于过球心O.的竖直平面内
如图所示一半径为R.的透明圆柱体放在水平面上AOB为透明圆柱体的截面一束蓝光从AO面的中点沿水平方向
一半径为R.的1/4球体放置在水平面上球体由折射率为的透明材料制成现有一束位于过球心O.的竖直平面内
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OldTomhadfoursons.Hewantedthem1learnnottojudgethingstooquickly.Sohesentthemtolookatanappletreeindifferentseasons.Thefirstsonwentinwinterthesecondinspringthethirdinsummerandtheyoungestinautumn.Whentheyallcamebackhecalledthemtogethertodescribe2theyhadseen.Thesonshaddifferent3opinion.Tomthentoldthemthattheyshouldn'tjudgeatreeorapersonbyonlyoneseason.
假设你是红星中学高三学生李华你的英国朋友Jim在给你的邮件中提到他暑假将来北京参加外国人唱中国歌大赛希望你为他推荐一首中文歌曲.请给他回邮件内容包括 1.推荐曲目 2.推荐理由 3.你的祝愿. 注意1.词数不少于50 2.开头和结尾已给出不计入总词数. DearJim Yours LiHua
根据下列图示所得出的结论不正确的是
Ablackholeisaspotinspacethathas1powergravity.Itsgravityissostrongthatitpullseverythingnearbyintoitstarsplanetsandotherthings.Blackholesformwhenastardies.Whenthathappensahugeamountofmattercrowdsintoaverysmallspace2becomesverydense.Blackholes3talkaboutin1783first.Thatyearonescientistsaidthatintheuniversetheremightbeplaceswithstronggravitytotraplightalthoughhedidn'tusethetermblackhole.
RayTokudaa54﹣year﹣oldJapaneseAmericanisproudofthetitlehisschoolhasgivenhim.HeisaShifuaChinesewordliterallymeaningamastermentororseniorpractionerofmartialarts. Tokudahasreasontobeproud.HehasbeeninvolvedwithChinesemartialartsforalmostfourdecades.AfterlearningthematthemartialartsschoolinNewMexicoStatetodayheisamongthemostexperiencedkungfuteachersoftheschool. PracticingmartialartstwotothreehoursandhelpingstudentsimprovetheirskillshavebecomeTokuda'sdailyroutine.Heexpectstopracticeandteachmartialartsfortherestofhislife.I'mstilllearning.It'sworthmorethanalifetimetolearnChinesemartialartshesaid.OnceIstartedIjustcouldn'tstop.Ithinkit'salsothemagicofChineseculture. Tokudawassenttothemartialartsschoolwhenhewas10.Hestillremembershowunwillinghewaswhenstartingout.MyfatherhadalwayswantedtolearnChinesemartialartsbutnevergotthechancesoheputhiskidinhesaid.IwassoafraidatthattimebecauseIthoughtkungfuwasallaboutfighting. Butthingschangedafterhelearnedthatmartialartsweremorethanpunchingandkicking. OneofthethingsmartialartsteachmeisovercomingadversityTokudasaid.AsalittlekidmyfirstlessonwaslikeohlookthisisathingthatIcangetthroughbydiligenceperseverance毅力anddedicationandthatwaspricelessformylife. LearningChinesemartialartsopenedagatewayforhimtobetterunderstandChineseculturebecausehecouldhearalotofancientChinesekungfu﹣relatedstories.ItislikeinAmericawherewehearstoriesaboutknightsinshiningarmorandKingArthurandnobledeedsdonehesaid.IfeelmartialartspreservesomethingofancientChinathatcan'tbefoundinbooks.Theyaresortofanoralhistory. TokudahasalsobeeninvitedtovariouseventsinhishomestatetoshowcasetraditionalChinesecultureincludingthedragondanceandliondancewhichhealsolearntatthemartialartsschool.Becauseofthisheisnowconsideredaculturalenvoy使者intheeyesofthepublic. 1Tokudadidn'twanttolearnkungfubecausehehadthoughtitwas. A.practical B.magical C.violent D.difficult 2FromthepassagewhatcanwelearnaboutTokuda A.Helearntmartialartsfromhisfather. B.Heisthefounderofthekungfuschool. C.Helearntfrommartialartshowtodealwithdifficulties. D.Heisthemostexperiencedkungfuteacherofhisstate. 3WhichofthefollowingwordscanbestdescribeTokuda A.Modestandfriendly. B.Devotedandpersevering. C.Talentedandhumorous. D.Motivatedandconsiderate.
直接排放含SO2的烟气会形成酸雨危害环境．工业上常采用催化还原法和碱吸收法处理SO2气体． 1①下图为1molCH4完全燃烧生成气态水的能量变化和1molSg燃烧的能量变化． 在催化剂作用下CH4可以还原SO2生成单质SgH2Og和CO2写出该反应的热化学方程式． ②某温度下向体积为2L的容器中充入6molH24molCO2发生反应CO2g+3H2g⇌CH3OHg+H2Og△H＜0达到平衡时H2的转化率为50%其平衡常数为保留两位有效数字． ③起始条件T1℃2L密闭容器如表所示 达到平衡时该反应的平衡常数KⅠKⅡ填“＞”“＜”或“＝”下同平衡时CH3OH的浓度cⅠcⅡ． 2CO2可用来合成低碳烯烃2CO2g+6H2gCH2⇌CH2g+4H2Og△H＝﹣127.8kJ•mol﹣1．0.1MPa下按nCO2nH2＝13的投料比充入体积固定的密闭容器中发生上述反应不同温度T下平衡时的四种气态物质的质量分数Φ如图所示 ①曲线bc表示的物质分别为填化学式． ②保持温度不变在体积为VL的恒容容器中以nCO2nH2＝23的投料比加入反应物t0时达到化学平衡．t1时将容器体积瞬间扩大至2VL并保持不变t2时重新达到平衡．请在图中画出容器内混合气体的平均相对分子质量M随时间的变化图象． 3用氨水吸收SO2．25℃时2.0mol•L﹣1的氨水中NH3•H2O的电离度α＝α＝×100%．将含SO2的烟气通入该氨水中当溶液显中性时溶液中的＝．[已知25℃KbNH3•H2O＝1.8×10﹣5Ka1H2SO3＝1.3×10﹣2Ka2H2SO3＝6.2×10﹣8]
下列指定反应的离子方程式正确的是
轴烯旋烷是一类具有张力的碳氢化合物结构如图所示．下列说法错误的是
2018年10月中国美丽乡村百家范例经验交流会在我省举办．下列做法不应该提倡是
设甲乙两位同学上学期间每天730之前到校的概率均为．假定甲乙两位同学到校情况互不影响且任一同学每天到校情况相互独立． Ⅰ用X表示甲同学上学期间的三天中730之前到校的天数求随机变量X的分布列和数学期望 Ⅱ设M为事件“上学期间的三天中甲同学在730之前到校的天数比乙同学在730之前到校的天数恰好多2”求事件M发生的概率．
叶蜡石的化学式为X2[Y4Z10]ZW2短周期元素WZXY的原子序数依次增大X与Y为同一周期相邻元素Y的最外层电子数为次外层的一半X的离子与ZW﹣含有相同的电子数．下列说法错误的是
实验室用红土镍矿主要成分为NiSFeSCaS和SiO2等为原料制备NiSO4•6H2O的流程如图1 已知①CaF2难溶于水NiSO4易溶于水不溶于乙醇②Ni溶于稀硫酸． 1“煅烧”的目的是． 2“煅烧”得到的Ni2O3有强氧化性“酸浸”时有气体产生且镍被还原为Ni2+则产生的气体为填化学式浸出渣的主要成分为填化学式． 3“还原”后得到的滤渣是单质镍硫的混合物请写出通入H2S气体时生成单质镍的离子方程式为． 4检验“沉钙”完全的操作为． 5NiSO4质量分数随温度变化曲线如图2请补充流程中“过滤”后得到NiSO4•6H2O晶体的实验方案将滤渣得到NiSO4•6H2O晶体实验中须使用的试剂有1mol•L﹣1H2SO4乙醇．
在给定条件下下列选项所示的物质间转化均能实现的是
Smile!Itmakeseveryoneintheroomfeelbetterbecausetheyconsciouslyorunconsciouslyaresmilingwithyou.Growingevidenceshowsthataninstinctforfacialmimicry模仿allowsustoempathizewithandevenexperienceotherpeople'sfeelings.Ifwecan'tmirroranotherperson'sfaceitlimitsourabilitytoreadandproperlyreacttotheirexpressions.AreviewofthisemotionalmirroringappearsonFebruary11inTrendsinCognitiveSciences. IntheirpaperPaulaNiedenthalandAdrienneWoodsocialpsychologistsattheUniversityofWisconsindescribehowpeopleinsocialsituationscopyothers'facialexpressionstocreateemotionalresponsesinthemselves.Forexampleifyou'rewithafriendwholookssadyoumighttryonthatsadfaceyourselfwithoutrealizingyou'redoingso.Intryingonyourfriend'sexpressionithelpsyoutorecognizewhatthey'refeelingbyassociatingitwithtimesinthepastwhenyoumadethatexpression.Humansgetthisemotionalmeaningfromfacialexpressionsinamatterofonlyafewhundredmilliseconds. Youreflectonyouremotionalfeelingsandthenyougeneratesomesortofrecognitionjudgmentandthemostimportantthingthatresultsinisthatyoutaketheappropriateaction﹣youapproachthepersonoryouavoidthepersonNiedenthalsays.Yourownemotionalreactiontothefacechangesyourperceptionofhowyouseethefaceinsuchawaythatprovidesyouwithmoreinformationaboutwhatitmeans. Aperson'sabilitytorecognizeandshareothers'emotionscanbepreventedwhentheycan'tmimicfaces.Thisisacommoncomplaintforpeoplewithmotordiseaseslikefacialparalysis瘫痪fromastrokeorevenduetonervedamagefromplasticsurgery.Niedenthalnotesthatthesamewouldnotbetrueforpeoplewhosufferfromparalysisfrombirthbecauseifyou'veneverhadtheabilitytomimicfacialexpressionsyouwillhavedevelopedcompensatorywaysofinterpretingemotions. Peoplewithsocialdisordersassociatedwithmimicryoremotion﹣recognitiondamagelikeautism自闭症canexperiencesimilarchallenges.TherearesomesymptomsinautismwherelackoffacialmimicrymayinpartbeduetolimitationofeyecontactNiedenthalsays. Niedenthalnextwantstoexplorewhatpartinthebrainisfunctioningtohelpwithfacialexpressionrecognition.Abetterunderstandingofthatpartshesayswillgiveusabetterideaofhowtotreatrelateddisorders. 1Accordingtothepassagefacialmimicryhelps. A.experienceone'sownfeelingsclearly B.changeothers'emotionsquickly C.respondtoothers'expressionsproperly D.developfriendshipwithotherseasily 2WecanknowfromParagraph4and5that. A.peoplewithmotordiseasesmayalsosufferfromautism B.peoplebornwithfacialparalysismaystillrecognizeemotions C.peoplewithsocialdisorderscan'thaveeyecontactwithothers D.peoplereceivingplasticsurgeryhavedifficultyinmimickingfaces 3AccordingtoNiedenthalthenextstepofthestudywillfocuson. A.howwecantreatbraindisorders B.whatcanbedonetoregainfacialmimicry C.howourbrainhelpsuswithemotionalmirroring D.whatpartofourbrainhelpsrecognizefacialexpression 4Thepassageiswrittento. A.discusshowpeoplereactpositivelytoothers'smiles B.drawpeople'sattentiontothosewithsocialdisorders C.introduceanewtrendinfacialexpressionrecognition D.explainhowemotionalmirroringaffectspeople'sempathy
Everyone1lovesnow.Butwhenschoolstaysopendespitethesnowitcanbereallyannoying.Howeverthereisoneupsideofgoingtoschool2acoldwinterdayyoumightbesmarter.Sofarresearcherswhostudythebrain3findthatcoldtemperaturesmakeusthinkmorequicklysincemessagestravelfasteramongourbraincells.Sothescientistssay4hangoutonacoldmorningmayboosttheresultofanytestthatday.
下列关于Cl2的制备净化收集及尾气处理的装置和原理能达到实验目的是
NewAppHelpsPeopleRememberFaces Largegatheringssuchasweddingsandconferencescanbesociallyoverwhelming.Pressuretolearnpeople'snamesonlyaddstothestress.Anewfacial﹣recognitionappcouldcometotherescuebutprivacyexpertsrecommendproceedingwithcaution. TheappcalledSocialRecallconnectsnameswithfacesviasmartphonecamerasandfacialrecognitionpotentiallyavoidingtheneedforformalintroductions.ItbreaksdownthesesocialbarriersweallhavewhenmeetingsomebodysaysBarrySandrewwhocreatedtheappandtesteditataneventattendedbyabout1000people. AfterreceivinganinvitationtodownloadSocialRecallfromaneventorganizertheuserisaskedtotaketwoselfiesandsigninviasocialmedia.Attheeventtheappisactivewithinapreviouslydefinedgeographicalarea.Whenauserpointshisorherphonecameraatanattendee'sfacetheappidentifiestheindividualdisplaystheperson'snameandlinkstohisorhersocialmediaprofile.Toprotectprivacyitrecognizesonlythosewhohaveagreedtoparticipate.Andtheapp'screatorssayitautomaticallydeletesusers'dataafteranevent. AnnCavoukianaprivacyexpertwhorunsthePrivacybyDesignCenterofExcellencepraisestheapp'screatorsfortheseprotectivemeasures.Shecautionshoweverthatwhenpeoplechoosetosharetheirpersonalinformationwiththeapptheyshouldknowthattheremaybeunintendedconsequencesdowntheroadwiththatinformationbeingusedinanothercontextthatmightcomebacktobiteyou. Thestart﹣uphasalsodevelopedaversionoftheappforindividualswhosufferfromprosopagnosiaorfaceblindnessaconditionthatpreventspeoplefromrecognizingindividualstheyhavemet.Tousethisappapersonfirstacquiresanimageofsomeone'sfacefromeitherthesmartphone'scameraoraphotographandthentagsitwithaname.Whenthecameraspotsthatsamefaceinreallifethepreviouslyenteredinformationisdisplayed.Thecollecteddataarestoredonlyonauser'sphoneaccordingtotheteambehindtheapp. 1SocialRecallisusedto. A.takephotos B.identifypeople C.organizeevents D.makefriends 2Paragraph3ismainlyabout. A.howtheappworks B.howtheappwascreated C.whatmakestheapppopular D.whatpeoplecandowiththeapp 3SocialRecallhelpspeoplewithprosopagnosiaby. A.givingnamestothephotoskeptintheirsmartphones B.collectinginformationpreviouslyenteredinthephone C.providingtheinformationofapersonwhentheyfirstmeet D.showingtheperson'sinformationwhenitspotsastoredface 4WhatcanwelearnaboutSocialRecallfromthepassage A.Itmayputpeople'sprivacyatrisk. B.Ithascausedunintendedconsequences. C.Itcanpreventsomecommunicationdisorders. D.Itispraisedbyusersforitsprotectivemeasures.
假设你是红星中学高三学生李华请根据以下四幅图的先后顺序以ANewWaytoExploretheForbiddenCity为题用英语写一篇短文向校刊英语园地投稿记述上周末你带英国朋友Jim游览故宫的全过程. 注意词数不少于60. 提示词二维码QRcode
在初始温度为T时向三个密闭的容器中按不同方式投入反应物发生反应Ag+3Bg2Cg△H＜0测得反应的相关数据如下 下列说法正确的是
在四边形ABCD中AD∥BCAB=2AD=5∠A=30°点E在线段CB的延长线上且AE=BE则•=．
设椭圆+=1a＞b＞0的左焦点为F上顶点为B．已知椭圆的短轴长为4离心率为． Ⅰ求椭圆的方程 Ⅱ设点P在椭圆上且异于椭圆的上下顶点点M为直线PB与x轴的交点点N在y轴的负半轴上．若|ON|=|OF|O为原点且OP⊥MN求直线PB的斜率．
设函数fx=excosxgx为fx的导函数． Ⅰ求fx的单调区间 Ⅱ当x∈[]时证明fx+gx-x≥0 Ⅲ设xn为函数ux=fx-1在区间2nπ+2nπ+内的零点其中n∈N证明2nπ+-xn＜．
某研究小组拟以对苯二酚为原料合成染料G．合成路线如下 1G中的含氧官能团名称为写出两种． 2A→B的反应类型为． 3E的分子式为C17H19O3N写出E的结构简式． 4C的一种同分异构体同时满足下列条件写出该同分异构体的结构简式． ①含有苯环且分子中有一个手性碳原子能与FeCl3溶液发生显色反应 ②能发生水解反应水解产物均有4种不同化学环境的氢且水解产物之一是α氨基酸． 5已知①苯胺易被氧化 ② 写出和为原料制备的合成路线图．无机试剂任用合成路线流程图示例见本题题干
下列实验所用试剂现象和结论均正确的是
下列有关物质性质与用途具有对应关系的是
BenefitsofSports Doingsportsisaphysicalmentalandsocialadventure.It'sagreatwayforchildrentotakeabreakfromacademicsandreleaseextraenergy.Italsohelpsthemleadfullerandhappierlivesasregularsportshaveproventoimproveoverallwell﹣being. Thephysicalbenefitsofdoingsportsareprobablythemostobvious.Regardlessofyourfitnesslevelwhenyoustartplayingsportsyou'llnoticeanincreaseinyouroverallfitnessonceyou'reinvolved.1Basketballplayersfocusonstrengthtrainingfootballplayersworkonspeedwhiletrackathletestrainthroughlongerruns.Thetrainingprocesshelpspromotephysicalfitnessandperformancesincompetitions. 2Playingsportscontributestomentalhealthhelpingtoincreaseconfidenceandself﹣worth.Apatonthebackhigh﹣fivefromateammateorhandshakeafteramatchreallyboostsachild'sconfidence.Wordsofpraiseandencouragementfromthecoachparentsandotherplayersraisetheself﹣worth.3Soafteragameit'sabetterideatoaskDidyouenjoythegameratherthanDidyouwin Childrenwhoparticipateinsportsmightalsobenefitfromthesocialaspectfeelingpartofagroupbuildingupaccountabilityandleadership.4Teamworkinvolvesbothbeingdependableasateammateandlearningtorelyonyourteammatestoachieveapositiveoutcome.Teamworkbreedsaccountabilityandchallengesyoutoberesponsibleforyouractions.Beingpartofateamgivesyouanopportunitytobealeader. Disciplineisanothersocialadvantage.Mostorganizedsportsrequireastricttrainingandpracticeschedule.Asastudent﹣athleteyouneedtobalanceacademicsandathletics.5 Thereisnoshortageofreasonstofindasporttogetinvolvedin.AreyoureadytogoPickoneandgetmoving! A.It'snotjustyourbodythatbenefitsfromsports. B.Thereforeplayingsportsisgoingtomakeyoumorefit. C.Butrememberachild'sself﹣worthshouldnotbedistinguishedbyvictoryorloss. D.Ifyouplaygroupsportsyou'llbepartofateamthattakesdirectionfromacoach. E.Nearlyeverysportrequiresphysicalactivityandtheskillsneededtobecompetitive. F.Amongtheselearninghowtofunctionaspartofateamisthemostimportantadvantage. G.Onlywithstrictdisciplinecanyoubesuccessfulbothintheclassroomandinthesportsfield.
MyPerfectImperfectLife AfewyearsagoIwasstandingatthebarre扶手杠waitingformyadultballetclasswhenIheardavoicebehindme.Sodoyouhavethisperfectlife Myfirstreactionwasto1whowasbeingaskedsuchanoddquestion.ThenIrememberedtherewereonlytwoofusintheroom.WhenIturned2theotherwomanwaslookingstraightatme. Ihadnoideahowtoanswerit.Wasshe3WhohasaperfectlifeSureoccasionallyIdidfindtheperfectdressortheperfectpairofshoes4neverwouldIusethatwordtodescribeanythingaboutmeormylife.Ifeltatwingeofguiltforsomehowgivingherthat5. Shewatchedme.Ifinally6towhisperaquickNo. Bythentheteacherhadenteredtheroomandturnedonthemusictostartclass.Withasighof7Imovedmyfeetintothebestposition.ButassoonasmykneesbentforourfirstposeIrealizedmy8hadbeendisturbed.Thiswoman'swordswouldn't9echoinginmythoughts. Iwantedtoknowhowshecameupwithherverymistaken10.Ifsheknewanythingaboutmylifesheneverwouldhavehadthe11toaskmethatquestion. Ididmybesttodoourfloorexercisesinfrontofthemirror.ForafewmomentsIdidn'tseetheusual12ofmyolderselfattemptingtouseabeautifulartformto13mygracefulness.Ionlysawthelittlegirlwhosefatherdiedwhenshewastwothechildwhowalkedhomefromelementaryschooleverydaytoanemptyhousewholearnedtosewherownclothesto14money. Perfect.Mylifehadbeenfarfromit. Whenthosememories15IwasleftwithavisionofthewomanIhadbecomethewoman16byallthosethingsIconsideredimperfect.Inowsawthewomanwhohadlearnedtobeself﹣reliantwho17herfamilyandherfriendswhodidn'ttakelifeforgranted.Wasthattheperfectthiswomanhaddetected Istilldon'tknowbutInolongerfeel18orfeellikeImustkeeptrackofallthedifficulttimestoprovemylifeisn't19.IfeveragainaskedwhethermylifeisperfectIwouldhaveadifferent20.BecausenowIseethatdespiteallitsimperfectionitis. 1A.notice B.understand C.wonder D.expect 2A.up B.away C.over D.around 3A.fair B.serious C.anxious D.wise 4A.but B.or C.for D.and 5A.intention B.instruction C.impression D.information 6A.learned B.managed C.agreed D.planned 7A.sadness B.surprise C.pleasure D.relief 8A.concentration B.patience C.confidence D.effort 9A.escape B.keep C.stop D.stand 10A.idea B.advice C.reason D.theory 11A.right B.urge C.excuse D.honor 12A.reflection B.preference C.appearance D.expression 13A.experience B.describe C.replace D.improve 14A.collect B.earn C.spend D.save 15A.faded B.failed C.floated D.flashed 16A.buried B.shaped C.watched D.followed 17A.changed B.welcomed C.valued D.protected 18A.worried B.guilty C.cautious D.desperate 19A.comfortable B.ordinary C.perfect D.meaningful 20A.solution B.message C.approach D.answer
GOINGTOUNIVERSITYissupposedtobeamind﹣broadeningexperience.Thatstatementisprobablymadeincomparisontotrainingforworkstraightafterschoolwhichmightnotbesoencouraging.ButisitactuallytrueJessikaGolleoftheUniversityofTübingeninGermanythoughtshewouldtrytofindout.Herresulthoweverisnotquitewhatmightbeexpected.AsshereportsinPsychologicalSciencethisweekshefoundthatthosewhohavebeentouniversitydoindeedseemtoleavewithbroaderandmoreinquiringmindsthanthosewhohavespenttheirimmediatepost﹣schoolyearsinvocational职业的trainingforwork.Howeveritwasnotthecasethatuniversitybroadenedminds.Ratherworkseemedtonarrowthem. Dr.Gollecametothisconclusionaftersheandateamofcolleaguesstudiedtheearlycareersof2095Germanyoungsters.Theteamusedtwostandardizedteststoassesstheirvolunteers.Onewasofpersonalitytraitsincludingopennessconscientiousness认真andsoon.Theotherwasofattitudessuchasrealisticinvestigativeandenterprising.Theyadministeredbothteststwice﹣oncetowardstheendofeachvolunteer'stimeatschoolandthenagainsixyearslater.Oftheoriginalgroup382wereontheintermediatetrackfromwhichtherewasachoicebetweentheacademicandvocationalroutesanditwasonthesethattheresearchersfocused.Universitybeckonedfor212ofthem.Theremaining170chosevocationaltrainingandajob. WhenitcametothesecondroundoftestsDr.Gollefoundthatthepersonalitiesofthosewhohadgonetouniversityhadnotchangedsignificantly.Thosewhohadundergonevocationaltrainingandthengotjobswerenotthatmuchchangedinpersonalityeither﹣exceptinonecrucialrespect.Theyhadbecomemoreconscientious. Thatsoundslikeagoodthingcertainlycomparedwiththecommonpublicimageofundergraduatesasabunchoflazybones.Butchangesinattitudethattheresearchersrecordedwereratherworrying.Intheuniversitygroupagainnoneweredetectable.Butthosewhohadchosenthevocationalrouteshowedmarkeddropsininterestintasksthatareinvestigativeandenterprisinginnature.Andthatmightrestricttheirchoiceofcareers. Someinvestigativeandenterprisingjobssuchasscientificresearchareindeedbeyondthedegreeless.ButmanyparticularlyinGermanywithitstraditionofvocationaltrainingarenot.Theresearchersmentionforexamplecomputerprogrammersandfinance﹣sectorworkersascareersrequiringthesetraits.IfDr.GolleiscorrectandchangesinattitudebroughtaboutbytheverytrainingGermanypridesitselfonarenarrowingpeople'schoicesthatisindeedamatterworthyofseriousconsideration. 1WhichofthefollowingcanbestreplacebeckonedforinParagraph2 A.Examined. B.Attracted. C.Organized. D.Recognized. 2Whatcanwelearnfromtheresearch A.Thedegreelesshavenotchangedinpersonalities. B.Goingtouniversityisamind﹣broadeningexperience. C.Workingstraightafterschoolnarrowspeople'sminds. D.Collegestudentspridethemselvesontheireducation. 3Accordingtothelasttwoparagraphs. A.collegestudentsenjoyaverygoodpublicimage B.theundergraduateshavechangedsignificantlyinattitude C.thedegreelessaremuchbetteratdealingwithchallengingtasks D.peopleshowlessinterestininvestigativejobsduetovocationaltraining 4Whatistheauthor'sattitudetowardsthefinding A.Concerned. B.Optimistic. C.Unclear. D.Sceptical.
丹参醇可由化合物X在一定条件下反应制得 下列有关化合物XY和丹参醇的说法正确的是
冰晶石又名六氟铝酸钠Na3AlF6是白色固体微溶于水常用作电解铝工业的助熔剂．工业上用萤石主要成分是CaF2浓硫酸氢氧化铝和碳酸钠溶液通过湿法制备冰晶石某化学实验小组模拟工业上制取Na3AlF6的装置图如下该装置均由聚四氟乙烯仪器组装而成． 已知CaF2+H2SO4CaSO4+2HF↑ 1实验仪器不能使用玻璃仪器的原因是． 2仪器a的作用是装置Ⅲ的作用为． 3实验过程中装置Ⅱ中有CO2气体逸出同时观察到有白色固体析出请写出该反应的离子方程式． 4实验过程中先向装置Ⅱ中通入HF气体然后再滴加Na2CO3溶液而不是先将Na2CO3和AlOH3混合后再通入HF气体其原因是． 5装置Ⅱ反应后的混合液经过过滤可得到Na3AlF6晶体在过滤操作中确定沉淀已经洗涤干净的方法是． 6在电解制铝的工业生产中阳极的电极反应式为．
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