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汽车发动机的散热器用水做冷却剂，是由于水的 较大的缘故；发动机温度降低是通过 方式减少内能的．
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汽车的发动机选用水做冷却剂主要是由于水的比热容较的缘故烈日下操场上单杠的温度会升高这是通过的方式改变
汽车散热器常用水作为冷却剂这是利用了水的__________较大的性质当汽车散热器散热时通过____
汽车发动机的冷却剂主要成员是水用水作为冷却剂主要是因为水的
比热容较大
密度较大
凝固点较低
导热性好
汽车的发动机选用水做冷却剂主要是由于水的比热容较的缘故.烈日下操场上地面温度会升高这是通过的方式改变
汽车发动机工作时做功冲程实现能转化成机械能．发动机散热器常用水做冷却剂这是因为水的大．
当汽油在发动机内燃烧不充分时会冒黑烟这时发动机的效率选填升高不变或降低发动机散热器常用水做冷却剂这是
汽车发动机的散热器用水做冷却剂是由于水的较大的缘故发动机温度降低是通过方式减少内能的
汽车发动机常用水做冷却剂主要是因为水的
比热容较大
比热容较小
密度较大
密度较小
汽车发动机工作时当汽油在发动机内燃烧不充分时会冒黑烟这时发动机的效率______选填升高不变或降低.
汽车发动机的散热器用水做冷却剂是由于水的较大的缘故发动机温度降低是通过方式减少内能的．
汽车发动机的散热器用水做冷却剂是由于水的______较大的缘故发动机温度降低是通过______方式减
我们会看到汽车行驶过程中冒黑烟其原因是____________________这时发动机的效率相对较
汽车发动机上的散热器用水作为冷却剂这是利用了水的比热容较大的性质如果散热器中装有10kg的水在温度升
吸烟者吞云吐雾时会波及周围人群这是由于分子在不停地做运动造成的.汽车的发动机选用水做冷却剂主要是由于
汽车散热水箱中的冷却剂中主要含有水酒精和一些添加剂以防冻防沸防腐蚀以水为主要成份这是利用了水的较大的
汽车发动机的散热器用水做冷却剂是由于水的较大的缘故发动机温度降低是通过方式减少内能的．
汽车发动机的散热器常用水做冷却剂这是利用了水的的特点当汽油在发动机内燃烧不充分时会冒黑烟这时发动机的
汽车上的散热器用水作为冷却剂这是利用了水的▲较大的性质
汽车发动机选用水做冷却剂主要是由于水的________较大常用塑料泡沫做包装材料的原因是塑料泡沫的密
汽车上的散热器主要是通过的方式来为发动机散热的用水做冷却剂利用了水的较大的性质．
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Onedayin1995alargeheavymiddle﹣agedmanrobbedtwoPittsburghbanksinbroaddaylight.Hedidn'twearamaskandhesmiledatsurveillancecamerasbeforewalkingoutofeachbank.LaterthatnightpolicearrestedasurprisedMcArthurWheeler.WhentheyshowedhimthesurveillancetapesWheelerstaredindisbelief.ButIworethejuicehemumbled.ApparentlyWheelerthoughtthatrubbinglemonjuiceonhisskinwouldmakehiminvisibletovideotapecameras.Afteralllemonjuiceisusedasinvisibleinksoaslongashedidn'tcomenearaheatsourceheshouldhavebeencompletelyinvisible. ThecasecaughttheeyeofthepsychologistDavidDunningatCornellUniversitywhoenlistedhisgraduatestudentJustinKrugertoseewhatwasgoingon.Theyreasonedthatwhilealmosteveryoneholdsfavourableviewsoftheirabilitiesinvarioussocialandintellectualfieldssomepeoplemistakenlyassesstheirabilitiesasbeingmuchhigherthantheyactuallyare.ThisillusionofconfidenceisnowcalledtheDunning﹣Krugereffectanddescribesthecognitivebiastoinflateself﹣assessment. ToinvestigatethisphenomenoninthelabDunningandKrugerdesignedsomecleverexperiments.Inonestudytheyaskedundergraduatestudentsaseriesofquestionsaboutgrammarlogicandjokesandthenaskedeachstudenttoestimatehisorherscoreoverallaswellastheirrelativerankingscomparedtotheotherstudents.Interestinglystudentswhoscoredthelowestinthesecognitivetasksalwaysoverestimatedhowwelltheydid﹣byalot.Studentswhoscoredinthebottomestimatedthattheyhadperformedbetterthantwo﹣thirdsoftheotherstudents! Sureit'stypicalforpeopletooverestimatetheirabilities.Theproblemisthatwhenpeopleareincompetentnotonlydotheyreachwrongconclusionsandmakeunfortunatechoicesbutalsotheyarerobbedoftheabilitytorealizetheirmistakes.Inasemester﹣longstudyofcollegestudentsgoodstudentscouldbetterpredicttheirperformanceonfutureexamsgivenfeedbackabouttheirscoresandrankings.Howeverthepoorestperformersshowednorecognitiondespiteclearandrepeatedfeedbackthattheyweredoingbadly.Insteadofbeingconfusedorthoughtfulabouttheirincorrectwaysincompetentpeopleinsistthattheirwaysarecorrect.AsCharlesDarwinwroteinTheDescentofMan1871Ignorancemorefrequentlybegetsconfidencethandoesknowledge. Interestinglyreallysmartpeoplealsofailtoaccuratelyself﹣assesstheirabilities.AsmuchasD﹣andF﹣gradestudentsoverestimatetheirabilitiesA﹣gradestudentsunderestimatetheirs.Thedifferenceisthatcompetentpeoplecananddoadjusttheirself﹣assessmentgivenappropriatefeedbackwhileincompetentindividualscannot. 1WhichofthefollowingstatementsabouttheDunning﹣KrugereffectisTRUE? A.Theeffectistrueforeveryoneindailylife. B.Itsuggeststhatmostpeoplelackcognitiveabilities. C.Somepeopleareoverconfidentabouttheirabilities. D.Theconclusionisdrawnbasedonaseriesofbankrobberies. 2Whatdothecollegestudents'behaviorsmentionedintheexperimentsprove? A.Feedbackplaysasignificantroleinestimatingone'sability. B.Incompetentpeoplehavearigidattitudetowardstheirchoice. C.Goodstudentscanpredicttheirfutureperformanceaccurately. D.Peoplecan'trelyontheirpreviousbehaviortomakeadjustments. 3TheunderlinedwordbegetsinParagraph4canbereplacedby. A.givesriseto B.takesadvantageof C.makesupfor D.breaksawayfrom 4Whatcanweinferfromthepassage? A.Realknowledgeisknowingtheextentofone'signorance. B.Itisdifficultforpeopletoevaluatetheirrealcompetence. C.Illusionofconfidenceisthemajorsourceofpeople'sfailure. D.Thosewithgreatabilitiesoftenhavealowopinionofthemselves.
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已知向量＝x11＝410||＝则x＝•＝．
如图F是椭圆C＝1a＞b＞0的右焦点直线ABx-2y+2＝0与椭圆C相切于点A Ⅰ若a＝求b Ⅱ若||＝||＝0求椭圆C的方程．
Therumoraboutmesoquicklythateverypersoninmycompanyknowsitinashorttime. A.develops B.transforms C.accelerates D.circulates
Whileabruteforceapproachtolearningmaygetthejobdoneit'snotnecessarilythebeststudyplan.Wedugthroughscientificresearchtoidentifyfivestudymethodsthatarerecommendedbycognitivescientists.Thesestudytipsmayimprovetheefficiencyofhowyoustudyhelpingyoutolearnmoreinlesstimeandkeepitlonger. Don'tWaitUntiltheLastMinute Parentsandteachersoftenwarnthatcrammingforexamsisn'tthebestwaytogetgoodgrades.There'ssciencetobackthisup.Researchersfoundthatfinaltestresultsimprovedwhenstudyingwasspacedoutovertime.Thisspacingeffecthasbeenrepeatedlystudiedandoneresearchexperimentfounda36%improvementingradesbecauseofspacingoutstudysessions.Byspacingoutstudysessionsthere'saneural神经的processoflearningforgettingalittlebitandre﹣learning.Thesecyclesarewhatbuildstrongermemory. UsePracticeTests Usingpracticetestswhilepreparingforexamscanhelpyouimproveyourperformance.Thislearningstrategyisn'tjustaboutbecomingfamiliarwithatestingformatit'saboutreinforcingthebrain'smemory. Rememberthatre﹣readingmaterialcanrefreshyourawarenessbutitwon'thelpyoubuildthememoryrecallskillsthatcanhelpyouknowthecorrectanswerduringyourexam.Abetterwaytostudyistouseflashcardsorsamplequizzesfromyourtextbook. DoOneThingataTime Researchshowsthatmultitaskingisn'tgoodforyourmemorysowhenyou'restudyingthat'stheonlythingyoushouldbedoing.ConsideryourbrainpowersimilartoyourInternetbandwidth.Multipledownloadsatthetimewillslowthingsdown.Similarlymultitaskingcausesanincreasedcognitiveloadforyourbrainreducingyourabilitytopayattentiontowhatyou'relearning. Infactresearchersfoundthatevenminimalmultitaskinghasaneffect.Somethingassimpleaswalkingaroundatrackwhilelearningvocabularywordscauseda17%reductionintestscores. AddVariety Whileit'sagoodideatoonlystudyforonesubjectatatimescientistsfoundthatalternatingbetweensubtopicscoulddramaticallyimprovememory. Thisprocessknownasinterleavingmeansthatyou'llcyclethroughaboutthreesubtopicslearningalittlebitmoreabouteachduringeachcycle.Onceyou'vefullystudiedthissetandhaveanunderstandingofthematerialyoucanmoveontothenextsetandrepeatthepattern. TeachaFriend It'slongbeensaidthatthebestwaytolearnsomethingistoteachittosomeoneelse.KnownastheprotégéeffectthislearningtheorydatesbacktoancientRome. Thereasonthestudytechniquehaslastedsolongisthatit'seffective.Researchersfoundthatevenexplainingclassmaterialtoyourselfcouldresultinthreetimesbettertestscoresthanthoseofotherstudentsputtingyouwellahead. Fivelearningstrategiestobe1inyourstudy Passageoutline Supportingdetails Don'twaituntilthelastminute ●Thereisscientificevidenceto2thefactthatcrammingforexamsdoesnotnecessarilybringaboutgoodgrades. ●Insteadofspacingoutstudysessionsstudentstendtopreparefortheirtestsina3. Usepracticetests ●Practicetestsarenotmerelyintendedtomakestudents4withtestingformatsbutreinforcedthebrain'smemory. ●Re﹣readingmaterialcanmakeyou5ofwhatyouhavelearntwhileflashcardsorsamplequizzescanbuildmemoryrecallskills. 6multitasking Multipletaskscanreducetheabilitytofocusonwhatisbeinglearned. Involvesubtopicsinyourstudy ●Studyingforonesubjectatatimeisrecommendedbutalternatingbetweensubtopicsleadstodramatic7inmemory. ●Interleavingisalearningprocesswherestudentslearnaboutthreesubtopicsineach8. Teachafriend ●Protégéeffectisalearningtheoryinwhichstudentscan9fromteachingsomeoneelse. ●Explainingclassmaterialtooneselfmay10.
已知椭圆C1m2x2+y2＝10＜m＜1与双曲线C2n2x2-y2＝1n＞0有共同的焦点e1e2分别为C1C2的离心率则e1•e2的取值范围是
请阅读下面文字及图片并按照要求用英语写一篇150词左右的文章. SoCloseYetSoFar WhereamI?WhatamIdoing?Ifyou'reoneofmy500friendsonlineyou'llalwaysbethefirsttoknow.MyphoneandlaptopareneveroutoftouchingdistancesoI'mconstantlypostingupdatesonsocialmedia﹣whetherI'mhavingacoffeeonmywaytoschoolwatchingTV…evenwhenI'mintheshower.Ihaveanever﹣endingflowofmessagesandupdatesfromallthepeopleIassociatewithonline. Iliveinauniversitydormwithacoupleofgreatroommates.YetthetruthofthematterisIfeellonely.AfewdaysagoIwentoutforadinnerget﹣togetherwithsomefriends.Mybestfriendleftthetablefor30minutesbecausehehadtotakeacall.Somespentthedinnerbentovertheirphonestextingfriendsonlinebutignoringtheonewhosatrightinfrontofthem.Andtheextraordinarythingisnoonethoughtthiswasrudeit'sjusthowlifeisnowadays. 【写作内容】 1.用约30个单词概述上述文字所描述的现象 2.分析造成该现象的原因两至三点 3.请你给Mark提两到三条建议. 【写作要求】 1.写作过程中不能直接引用原文语句 2.作文中不能出现真实姓名和学校名称 3.不必写标题. 【评分标准】 内容完整语言规范语篇连贯词数适当.
InAHistoryofReadingtheCanadiannovelistAlbertoMangueldescribesaremarkabletransformationofhumanconsciousnesswhichtookplacearoundthe10thcenturyA.D.thearrivalofsilentreading.Humanbeingshavebeenreadingforthousandsofyearsbutinancienttimesthenormalthingwastoreadaloud.WiththearrivalofsilentreadingManguelwrites…thereaderwasatlastabletoestablishanunrestrictedrelationshipwiththebookandthewords.Thewordsnolongerneededtooccupythetimerequiredtopronouncethem.Thereader'sthoughtsinspectedthematleisuredrawingnewideasfromthemallowingcomparisonsfrommemoryorfromotherbooks. ①Toreadsilentlyistofreeyourmindtoreflecttoremembertoquestionandcompare.ThecognitivescientistMaryanneWolfcallsthisfreedomthesecretgiftoftimetothink.Athousandyearslatercriticsfearthatdigitaltechnologyhasputthisgiftindanger.TheInternet'sfloodofinformationtogetherwiththedistractionsofsocialmediathreatenstooverwhelmthespaceofreadingleavingusinwhatthejournalistNicholasCarrhascalledtheshallows.InCarr'sviewtheendlesstemptingbuzzoftheInternetendangersourverybeingOneofthegreatestdangerswefacehewritesaswegiveupcontrolovertheflowofourthoughtsandmemoriestoapowerfulelectronicsystemisaslowdamagetoourhumannessandourhumanity. ②There'snoquestionthatdigitaltechnologypresentschallengestothereadingbrain.Butseenfromahistoricalperspectivedigitalreadingandsilentreadinglooklikedifferencesofdegreeratherthanofkind.Totheextentthatdigitalreadingrepresentssomethingnewitspotentialcutsbothways.DonebadlytheInternetreducesustomindlessclickersracingnumblytothebottomofabottomlessfeedbutdonewellithasthepotentialtoexpandtheverycontemplative沉思的spacethatwehaveprizedinourselveseversincewelearnedtoreadwithoutmovingourlips. ③InthefifthcenturyB.C.Socratesworriedthatwritingwouldweakenhumanmemoryandstifle扼杀judgment.InfactasWolfnotesinher2007bookProustandtheSquidtheStoryandScienceoftheReadingBraintheoppositehappenedFacedwiththewrittenpagethereader'sbraindevelopsnewcapacities. ④TheInternetmaycauseourmindstowanderoffandyetaquicklookatthehistoryofbookssuggeststhatwehavebeenwanderingoffallalong.Whenwereadtheeyedoesnotprogresssteadilyalongthelineoftextitalternatesbetweensaccades﹣littlejumps﹣andbriefstopsnotunlikethemovementofthemouse'scursoracrossascreenofhypertext. ⑤It'struethatstudieshavefoundthatreadersgiventextonascreendoworseonrecallandcomprehensionteststhanreadersgiventhesametextonpaper.Buta2015studybytheGermaneducatorJohannesNaumannsuggeststheopposite.Hegaveagroupofhigh﹣schoolstudentsthejoboftrackingdowncertainpiecesofinformationonwebsiteshefoundthatthestudentswhoregularlydidresearchonlinewerebetteratthistaskthanstudentswhousedtheInternetmostlytosendemailchatandblog. ⑥Anewgenerationofdigitalwriterspreferstoincludeinteractivefeatures.The2014iPadnovelPrytellsthestoryofademolition爆破expertreturninghomefromthefirstGulfWar.Thestoryistoldintextphotographsvideoclipsandaudio.Itusesaninterface界面thatallowsyoutofollowtheactionandshiftbetweenlevelsofawareness.Asyoureadtextonthescreendescribingcharactersandplotyoudrawyourfingersapartandseeaphotographofthechiefcharacterhiseyesopeningontheworld.Pinchyourfingersshutandyouvisithistroubledunconsciouswordsandimagesracebyasifyouareinsidehismemory.Pryistheoppositeofashallowworkitswholeplayisbetweenthesurfaceandthedepthsofthehumanmind.Readingitisstimulating. 1InAlbertoManguel'sopinionsilentreading. A.isanabnormalthingtohumanconsciousness B.offersreaders'mindfreedomandtimetothink C.strengthensreaders'powerofmemoryandreflection D.allowsreaderstogainaninsightintobooksandwords 2Whyisdigitaltechnologyconsideredtohaveendangeredourbeing? A.Itpresentschallengestothereadingbrain. B.Itharmsourhumannessandhumanitygradually. C.Itisverylikelytoexpandourcontemplativespace. D.Itleavesourthoughtsandmemoriesoutofcontrol. 3ThesentenceThefearoftechnologyisnotnew.shouldbeplacedin. A.① B.② C.③ D.④ 4WhatcanweinferfromJohannesNaumann'sstudy? A.It'seasiertocollectinformationontheInternetthaninbooks. B.People'shabitofusingtheInternetinfluencestheirperformance. C.TheInternetisn'tsupposedtobeusedasatoolofentertainment. D.Paperreadingisbetterthanscreenreadinginimprovingcomprehension. 5The2014iPadnovelPryismentionedinthelastparagraphto. A.introducetheoccurrenceofareadingrevolution B.showthetechnologyemployedindigitalreading C.provedigitalreadingnotshallowbutattractive D.illustratetheimpactdigitalreadinghasonourlife 6Whatisprobablythebesttitleforthepassage? A.Thedeepspaceofdigitalreading B.Thetimelyarrivalofsilentreading C.Thedevelopmentoftraditionalreading D.Thepotentialdamageofelectronicbooks
HowtoStrengthenWillpower Manypeoplebelievewithmorewillpowertheywouldalleatrightexerciseregularlyavoiddrugsandalcoholstopprocrastinating拖延andachieveallsortsofnoblegoals.Willpowerisnotanewconceptbutwestilldonothavewidespreadawarenessofit. Asitturnsoutyourwillpowerislikeamuscle.Andsimilartohowyourmusclesgettiredattheendofaworkoutthestrengthofyourwillpowerfadesasyoumakemoredecisions.Thismakessense.InaresearchstudypublishedbytheNationalAcademyofSciencespsychologistsexaminedthefactorsthatimpactwhetherornotajudgeapprovesacriminalforparole假释.Atthebeginningofthedayajudgewillgiveeachcaseafairshot.Butastheirenergystartstofade?Denydenydeny. Alargebodyofresearchhasbeendevelopedinrecentyearstoexplainmanyaspectsofwillpower.Mostoftheresearchersexploringself﹣controldosowithanobviousgoalinmindHowcanwillpowerbestrengthened? Avoidingtemptationisoneeffectivestrategyformaintainingself﹣control.InWalterMischel'smarshmallow软糖studythechildrenwhostareddirectlyatthetreatwerelesslikelytoresistitthanwerekidswhoclosedtheireyesturnedawayorotherwisedistractedthemselves.Thisprincipleappliestoadultstoo.Onerecentstudyforinstancefoundofficeworkerswhokeptcandyinadeskdraweratelessthanwhentheykeptthecandyinplainsight. Anotherhelpfultechniqueforimprovingself﹣controlisanimplementation履行intention.ForexamplesomeonewhoiswatchingtheiralcoholintakemightsaybeforeapartyIfanyoneoffersmeadrinkthenI'llaskforclubsoda.Researchamongadolescentsandadultshasfoundthatimplementationintentionsimproveself﹣controlevenamongpeoplewhosewillpowerhasbeenreducedbylaboratorytasks. Justlikeamusclethatgetstiredwithheavyusethereisanotheraspecttothemusclecomparison.Whilemusclesbecomeexhaustedbyexerciseintheshorttermtheyarestrengthenedbyregularexerciseinthelongterm.Similarlyregularlyexercisingself﹣controlmayimprovewillpowerstrength. Theevidencefromwillpower﹣depletionstudiesalsosuggeststhatmakingalistofresolutions心愿onNewYear'sEveistheworstpossibleapproach.Beingusedinoneareacanreducewillpowerinotherareassodon'ttrytoquitsmokingadoptahealthydietandstartanewexerciseplanatthesametime.Takinggoalsonebyoneisabetterapproach.Onceagoodhabitisinplaceyou'llnolongerneedtodrawonyourwillpowertomaintainthebehavior.Eventuallyhealthyhabitswillbecomeroutineandwon'trequiremakingdecisionsatall. Sonexttimeinthefaceoftemptationyoudon'thavetoworryaboutthedrainonyourwillpower.Withproperapproachesyoucantrainyourwillpowertostaystrong. A1resource ★Justlikemusclewillpowerdecreasesasyouuseitmore. Intheparoleinstancethejudgemademore2judgementsastimepassed. Waystostrengthenwillpower ★Willpowercanbemaintainedby3awayfromtemptations. Researchfoundthatofficeworkersatelesscandywhenitwasoutof4. ★Havinga5aheadoftimewillnotexhaustyourwillpowerwhenmakingdecisions. Forexampleonemaydecidebeforeapartythatifofferedadrinkaskforsoda6. ★Willpowercanbestrengthenedthroughregular7. ★Don'ttrytoaccomplishtoomanygoalsata8. AsevidenceshowsNewYearresolutionsdon'tworkbecauseyourwillpoweris9up. Good10aboutwillpower Peoplecanstrengthentheirwillpowerwiththerightapproaches.
已知双曲线＝1a＞0b＞0的一条渐近线方程为y＝-2x则此双曲线的离心率为
MykidssitinGee'slivingroomandcautiouslyliftantiqueChristmasornaments饰品outofawell﹣lovedcardboardbox.Geestandsbesidethemquietly1eachtreasure.ShetellsmethatsheandTombuilttheirornament2piecebypieceduringeachyear'safter﹣Christmassale.She3asweleavewiththebox.Herprecioustreasuresgatheredoveralifetimehavefoundanew4. WefirstmetTomandGeeintheearlydaysofourmarriage.Someonehadbeen5ourgarbagecanstothegarageeachgarbagedayandJimandIhad6who.Thenonedaywe7himanelderlymanwholivedacrossthestreet. Ibakedcookiesandleftthemonastooloutsidethegaragewithathank﹣younote.Whenwegothomefromworkthatdayatypedletterhad8thegift.TheletterwasfromTomandexplainedhowhehadcometowalktheneighborhoodongarbagedayreturningcansforpeoplehe9knew.Backwhenhe'dbeenfightingawarIwasn't10toseehisyoungwifeGeehadfoundherselflivingalone.Neighborshadtakenthetimetohandlehergarbagecans11shedidn'thavetoandheneverforgot.Nowhe12itforwardbydoingthesameforallofus. Afewyearsafterwe'dmovedinTom13.Wephotocopiedthat14andattachedittooneofourownforGee.Wetoldherhow15Tomhadbeentousandhowwegrievedforher.Shewrotebackandtoldusshe16talkedtoTomeveryday.WhenGeeinvitedusovertolookthroughChristmasornamentsIrealizedhowharditmustbeto17withthatboxapieceofTom. JimandIagreeto18ourtreewithGee'sornamentsthisChristmasoutoftheboxthatis19inTom'shandwriting.MaybeI'lltalktohimjustasGeestilldoes.ThankyouI'llsayforteachinguswhatit20tobeaneighbor. 1A.confirming B.explaining C.revealing D.touching 2A.shelf B.basement C.art D.collection 3A.smiles B.weeps C.sighs D.hesitates 4A.home B.destination C.function D.chance 5A.distributing B.exposing C.returning D.attaching 6A.discovered B.wondered C.foreseen D.investigated 7A.spotted B.impressed C.acknowledged D.grasped 8A.answered B.replaced C.delivered D.rewarded 9A.especially B.thoroughly C.previously D.barely 10A.willing B.voluntary C.alive D.keen 11A.so B.before C.because D.if 12A.brought B.carried C.paid D.pushed 13A.survived B.withdrew C.retired D.died 14A.note B.gift C.letter D.treasure 15A.grateful B.close C.special D.superior 16A.still B.even C.just D.ever 17A.live B.finish C.go D.part 18A.supply B.manage C.decorate D.arm 19A.drafted B.labeled C.signed D.preserved 20A.reflects B.desires C.anticipates D.means
用数学归纳法证明“1-+-+…+＝n∈N*”第一步应验证的等式是从“n＝k”到“n＝k+l”左边需增加的代数式是
已知F为抛物线y2＝4x的焦点过点F且斜率为1的直线交抛物线于AB两点设|FA|＞|FB|则＝．
若函数fx＝mx3+2x2-3x-1存在单调递增区间则实数m的值可以为
Someoftheworld'smostfamousmusiciansrecentlygatheredinParisandNewOrleanstocelebratethefirstannualInternationalJazzDay.UNESCOUnitedNationsEducationalScientificandCulturalOrganizationrecently1April30asadaytoraiseawarenessofjazzmusicitssignificanceanditspotentialasaunifying联合voice2cultures. Despitethecelebrations3intheU.S.thejazzaudiencecontinuesto4andgrowolderandthemusichasfailedtoconnectwith5generations. It'sJasonMoran'sjobtohelpchangethat.AstheKennedyCenter'sartistic6forjazzMoranhopesto7theaudienceforjazzmakethemusicmore8andpreserveitshistoryandculture. Jazzseemslikeit'snotreallyapartoftheAmerican9MorantellsNationalPublicRadio.WhatI'mhopingtoaccomplishisthatmygenerationandyoungerstartto10andunderstandthatjazzisnotblackandwhiteanymore.It'sactually11andit'sactuallydigital. Moransaysoneofthe12withjazztodayisthattheentertainmentaspectofthemusichasbeenlost.Themusiccan'tbe13todaythewayitwasin1908or1958.Ithastocontinuetomovebecausethewaytheworldworksis14saysMoran. LastyearMoranworkedonaprojectthat15FatsWaller'smusicforadancepartyjusttokindofputitbackinthemindthatWallerisdancemusic16itisconcertmusicsaysMoran.Formeit'stherecontextualization情景重构.Inmusicwheredoesthe17lie?Areweashumansgainingany18intohowwetalkaboutourselvesand19somethingasabstractasaCharlieParkerrecordgetsusintoadialogueaboutouremotionsandourthoughts?SometimeswelosesightthatthemusichasawidercontextsaysMoransoIwanttocontinuethose20. 1A.saluted B.set C.marked D.laid 2A.through B.around C.across D.outside 3A.regardless B.thus C.though D.rather 4A.expand B.boycott C.extend D.shrink 5A.younger B.smaller C.elder D.larger 6A.inventor B.adviser C.visitor D.officer 7A.widen B.strengthen C.enforce D.enrich 8A.available B.admirable C.avoidable D.accessible 9A.category B.appeal C.appetite D.recipe 10A.reconstruct B.reshape C.restore D.reconsider 11A.colorful B.meaningful C.creative D.sensitive 12A.connections B.problems C.satisfactions D.conflicts 13A.described B.revealed C.presented D.exposed 14A.transferring B.changing C.recovering D.processing 15A.managed B.arranged C.conveyed D.conducted 16A.asmuchas B.aslongas C.asfaras D.assoonas 17A.reality B.emotion C.melody D.future 18A.comprehension B.access C.appreciation D.insight 19A.why B.which C.how D.what 20A.trends B.dialogues C.messages D.contexts
We'reallusedtothelatestgenerationsofmobiletelecoms﹣sois5Gjustanotherupgrade?Farfromit﹣5Gisahugeleapforward﹣liketheshiftfromthehorseandcarttocars.Anditisn'tjustanetwork5Gwillbecomethefoundationoftheentireglobaldigitaleconomycapableofgeneratingtrillionsofpoundsofvalue. Everyoneandeveryindustrywillfeelitseffects.Comparedtotoday5Gwillbe10to20timesfasterandsupportbillionsofdigitaldeviceswithmuchgreaterreliabilityandsecurity.5GprovidestheplatformfortheInternetofThings﹣everythingfromself﹣drivingcarstoenhancedmedicalandsocialcaretoallmannerofnewindustrialandbusinessapplications.Wellestablishedonlineserviceslikemediaandentertainmentwillseesignificantimprovementssuchasultra﹣highdefinitionvideoandverylowlatency延时onlinegaming. 5Gcouplesafullfibrefixednetworkapproachwithhighcapacityhighreliabilityandlowlatencymobileplusadvancedsoftwareapproachessuchasedgecomputingandnetworkvirtualisation.Newtechniquessuchasnetworkslicingallowdifferenttypesofservicestorunatthesametimevastlyincreasingthescopeofapplicationsandservicesthatcanbesupported.Ineffectone5Gnetworkcanactasthousandsorevenbillionsofvirtualnetworkseachspecialisedforaparticulartaskordedicatedtoasinglecustomerbutallrunningononephysicalinfrastructure. Whileconsumersmaybethemostobviousbeneficiariesoffastermoreintelligentandusefulservices5Gwillalsobringenormousbenefitsandopportunitiestobusinessesbyallowingenhancementsanddifferentiatorstoexistingproductsandservicesorbyprovidingaplatformforentirelynewdigitalservices.5Gisanindustrialgame﹣changerandonethatyoucan'tignore.Withtrialsenablingtechnologyalreadyunderwayaroundtheworld5Gwillbecomeanincreasingrealitywithinthenextcoupleofyears. 5GisofsuchcriticalimportancetotheUKeconomythattheGovernmentisstronglybackingeffortstohelptheUKbecomeamarketleaderinexploitingthetechnology.IthasrecentlypublishedastrategytocreateanexcitingUK5Gworldandarrangetheactionsneededtospeeditsintroduction.Itisactivelycoordinatingeffortstoacceleratemaking5Garealityandisfundingtrialsofthetechnologyground﹣breakingapplicationsandinnovativebusinesspartnershipsacrossawiderangeofurbanandruralapplications. 1Whatcanwelearnabout5Gfromthisarticle? A.5Gwillbearegularupgradeofthelatestgenerationsofmobiletelecoms. B.5Gwillbemorereliableandsecurethantheearliergenerationsofmobiletelecoms. C.5Gwillalloweverysinglecustomertohaveonephysicalinfrastructuretorun. D.5Gwillbeontrialaroundtheworldwithinthenextcoupleofyears. 2Whatdoestheunderlinedwordbeneficiariesinparagraph4probablymean? A.Peoplewhomakecontributions. B.Peoplewhomakegains. C.Peoplewhohavecreativity. D.Peoplewhosufferlosses. 3WhatattitudedoestheUKholdtowards5G? A.Hesitant. B.Cautious. C.Concerned. D.Ambitious.
已知抛物线y2＝4x过焦点F作斜率为k1的直线交抛物线于AB两点．1若|AB|＝5求k1．2过焦点F再作斜率为k2的直线交抛物线于CD两点且MN分别是线段ABCD的中点若k1+k2＝1证明直线MN过定点．
已知向量满足||＝1||＝||•＝0．若对每一确定的||最大值和最小值分别为mn则对任意m-n的最小值是．
复数z＝1-ii为虚数单位的虚部为
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