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芴酮可用作工程塑料的改进剂．某芴酮可通过下列反应得到： ①化合物Ⅱ中含氧官能团为 和 （写名称）． ②鉴别化合物Ⅰ和化合物Ⅱ可用的试剂为 （写化学式）． ③1mol化合物Ⅰ最多可...
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高三下学期化学《》真题及答案
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2－乙酰氨基芴2－AAF和2－氨基芴2－AF在机体内可形N－羟基芳酰胺和N－羟基芳胺为近致癌物再通过
甲基化
葡萄糖醛酸化
硫酸化
A+B
C+B
以上叙述所涉及的毒理学生物过程的最佳选择是
氧化反应
生物转化
生物代谢
代谢活化
结合反应
下列不能用作工程塑料的是
聚氯乙烯
聚碳酸酯
聚甲醛
聚酰胺
工程塑料PBT的结构简式为下列有关PBT的说法正确的是
PBT是通过加聚反应得到的高聚物
PBT分子中含有酯基
PBT的单体中有芳香烃
PBT的单体均能与Na、NaOH、Na
2
CO
3
反应
Ames试验中在鉴别各标准菌株对诱变剂的反应时的鉴别需在有代谢活化的条件下进行
柔毛霉素
ICR-191
敌克松
2-氨基芴
下列盐既可通过金属与酸反应得到也可以通过金属与单质反应得到的是
FeCl
3
FeCl
2
MgCl
2
CuCl
2
下列塑料中最适宜用作安全防护头盔的材料是
ABS工程塑料
环氧树脂
尼龙
聚碳酸酯
可用作扩散剂的物质是
联苯
芴
苊
甲基萘
苯芴酮比色法测定锡时在弱酸性溶液中四价锡离子与苯芴酮形成微溶性的橙红色络合物应在保护性胶体存在下与标
锡是罐头食品的必测项目国标方法中用光度法测定锡是利用锡离子与下列哪种物质反应生成微溶性橙红色络合物进
碘化钾
苯芴酮
氯化亚锡
二硫腙
1-萘酚
Ames试验中在鉴别各标准菌株对诱变剂的反应时可直接溶解在水中
柔毛霉素
ICR-191
敌克松
2—氨基芴
2－乙酰氨基芴2－AAF和2－氨基芴2－AF在机体内可形N－羟基芳酰胺和N－羟基芳胺为近致癌物再通过
氧化反应
生物转化
生物代谢
代谢活化
结合反应
利用氨基酸分析仪测定食品中氨基酸使用的显色剂是
茚三酮
苯芴酮
酒石酸
亚甲蓝
钼蓝
锡是罐头食品的必测项目国标规定锡离子与某种物质反应生成微溶性橙红色化合物这里的某种物质是
碘化钾
苯芴酮
氯化亚锡
二硫腙
1-萘酚
由何种结合反应形成N-羟基芳香胺
甲基化
葡萄糖醛酸化
硫酸化
A+B
C+B
物种差异影响化合物的毒性的例子是
大鼠、小鼠、狗体内发生N-羟化，N-2-乙酰氨基芴与硫酸结合变成致癌物
猴子体内可发生N-羟化，N-2-乙酰氨基芴与硫酸结合变成致癌物
家兔体内可发生N-羟化，N-2-乙酰氨基芴与硫酸结合变成致癌物
豚鼠体内可发生N-羟化，N-2-乙酰氨基芴与硫酸结合变成致癌物
猫体内可发生N-羟化，N-2-乙酰氨基芴与硫酸结合变成致癌物
某饱和一元醛和酮的混合物共3g与足量的银氨溶液反应得到16.2gAg下列说法正确的是
该酮为丙酮
可能含乙醛
一定有甲醛
醛与酮的质量比不能确定
锡是罐头食品的必测项目国标规定锡离子与什么物质反应生成微溶性橙红色化合物
碘化钾
苯芴酮
氯化亚锡
双硫腙
1－萘酚
以苯芴酮比色法测定某饮料中锡含量吸取5.0mL样品水浴蒸干后用灰化法消化最后定容至50mL吸取5.0
DMSO氮酮及某些表面活性剂可用作软膏剂的穿透促进剂
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OldTomhadfoursons.Hewantedthem1learnnottojudgethingstooquickly.Sohesentthemtolookatanappletreeindifferentseasons.Thefirstsonwentinwinterthesecondinspringthethirdinsummerandtheyoungestinautumn.Whentheyallcamebackhecalledthemtogethertodescribe2theyhadseen.Thesonshaddifferent3opinion.Tomthentoldthemthattheyshouldn'tjudgeatreeorapersonbyonlyoneseason.
已知函数fx是定义在R上的奇函数f1=0当x＞0时xf'x-fx＞0则不等式的解集是．
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
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.
2x-8的展开式中的常数项为．
已知a=log52b=log0.50.2c=0.50.2则abc的大小关系为
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
已知函数fx=若方程有八个不等的实数根则实数a的取值范围是．
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
点外卖现已成为上班族解决午餐问题的一种流行趋势．某配餐店为扩大品牌影响力决定对新顾客实行让利促销规定凡点餐的新顾客均可获赠10元或者16元代金券一张中奖率分别为和每人限点一餐且100%中奖．现有A公司甲乙丙丁四位员工决定点餐试吃． Ⅰ求这四人中至多一人抽到16元代金券的概率 Ⅱ这四人中抽到10元16元代金券的人数分别用XY表示记ξ=XY求随机变量ξ的分布列和数学期望．
设变量xy满足约束条件则目标函数z=-4x+y的最大值为
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
已知函数fx=2lnx-x2． Ⅰ求fx在点P2f2处的切线方程 Ⅱ若函数y=fx与y=m在内恰有一个交点求实数m的取值范围 Ⅲ令gx=fx-nx如果gx图象与x轴交于Ax10Bx20x1＜x2AB中点为Cx00求证g'x0≠0．
已知a∈R．设函数fx=若关于x的不等式fx≥0在R上恒成立则a的取值范围为
阅读如图的程序框图运行相应的程序输出S的值为
Everyone1lovesnow.Butwhenschoolstaysopendespitethesnowitcanbereallyannoying.Howeverthereisoneupsideofgoingtoschool2acoldwinterdayyoumightbesmarter.Sofarresearcherswhostudythebrain3findthatcoldtemperaturesmakeusthinkmorequicklysincemessagestravelfasteramongourbraincells.Sothescientistssay4hangoutonacoldmorningmayboosttheresultofanytestthatday.
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.
已知等差数列{an}的公差为2前n项和为Sn且S1S2S4成等比数列． Ⅰ求数列{an}的通项公式 Ⅱ令求数列{bn}的前n项和T2n Ⅲ若对于∀n∈N*恒成立求λ范围．
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
设a∈R直线ax-y+2=0和圆θ为参数相切则a的值为．
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＜．
下列实验所用试剂现象和结论均正确的是
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.
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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