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试解下列各题： 计算导数；
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函数在x=0处下列结论中哪个结论正确
左导数存在，右导数不存在
右导数存在，左导数不存在
左右导数都存在，但导数不存在
导数存在
函数在X=0处下列结论中正确的是
右导数存在，左导数不存在
左右导数存在，但导数不存在
左导数存在，右导数不存在
导数存在
试解下列各题计算导数[*]
试求函数y=arctanx在x=0处的各阶导数．
函数在x=0处下列结论中正确的是
左导数存在，右导数不存在
右导数存在，左导数不存在
左右导数存在，但导数不存在
导数存在
怎样理解导数算法在原理上存在着计算误差?
设fx在-∞+∞内存在二阶导数．且与某直线至少交于3个点．试证明至少存在一点ξ使fξ=0．
函数在X=0处下列结论中正确的是
左导数存在，右导数不存在
右导数存在，左导数不存在
左右导数存在，但导数不存在
导数存在
设fx在-∞+∞上有界且存在二阶导数．试证明至少存在一点ξ∈-∞+∞使fξ=0．
下列的计算结果不受系统频率变化的影响
两点乘积算法
三点乘积算法
导数算法
傅立叶算法
设函数fx在-∞+∞有界且导数连续又对于任意实数x有｜fx+f’x｜≤1．试证明｜fx｜≤1．
试解下列各题 利用积分性质比较的大小．
函数在x=0处下列结论中正确的是
左导数存在，右导数不存在
右导数存在，左导数不存在
左右导数存在，但导数不存在
导数存在
计算下列各题+3+－12＝________
如图1所示是一种电热水龙头和它的电路简图2.旋转手柄可使扇形开关S.同时接触两个相邻触点从而控制流出
写出下列函数的导数1的导数为.的导数为.
某测验共6道题50名被试在该测验的各题得分的方差是0.750.810.790.830.850.
设fx在[ab]上存在一阶导数在ab内存在二阶导数且fa=fbf’af’b＞0．试证明至少存在一点ξ
试解下列各题利用积分性质比较[*]的大小．
如图所示是一种电热水龙头和它的电路简图旋转手柄可使扇形开关S.同时接触两个相邻触点从而控制流出的水为
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设Fx是fx在ab上的一个原函数则fx+Fx在ab上
Scienceinpracticedependsfarlessontheexperimentsitpreparesthanonthepreparednessofthemindsofthemenwhowatchtheexperiments.SirIsaacNewtonsupposedlydiscoveredgravitythroughthefallofanapple.Appleshadbeenfallinginmanyplacesforcenturiesandthousandsofpeoplehadseenthemfall.ButNewtonforyearshadbeencuriousaboutthecauseoftheorbitalmotionofthemoonandplanets.WhatkepttheminplaceWhydidn’’ttheyfalloutoftheskyThefactthattheapplefelldowntowardtheearthandnotupintothetreeansweredthequestionhehadbeenaskinghimselfaboutthoselargerfruitsoftheheavensthemoonandtheplanets. HowmanymenwouldhaveconsideredthepossibilityofanapplefallingupintothetreeNewtondidbecausehewasnottryingtopredictanything.Hewasjustwondering.Hismindwasreadyfortheunpredictable.Unpredictabilityispartoftheessentialnatureofresearch.Ifyoudon’’thaveunpredictablethingsyoudon’’thaveresearch.Scientiststendtoforgetthiswhenwritingtheircutanddriedreportsforthetechnicaljournalsbuthistoryisfilledwithexamplesofit. Intalkingtosomescientistsparticularlyyoungeronesyoumightgathertheimpressionthattheyfindthescientificmethodasubstituteforimaginativethought.I’’veattendedresearchconferenceswhereascientisthasbeenaskedwhathethinksabouttheadvisabilityofcontinuingacertainexperiment.Thescientisthasfrownedlookedatthegraphsandsaidthedataarestillinconclusive.WeknowthatthemenfromthebudgetofficehavesaidbutwhatdoyouthinkIsitworthwhilegoingonWhatdoyouthinkwemightexpectThescientisthasbeenshockedathavingevenbeenaskedtospeculate. Whatthisamountstoofcourseisthatthescientisthasbecomethevictimofhisownwritings.Hehasputforwardunquestionedclaimssoconsistentlythathenotonlybelievesthemhimselfbuthasconvincedindustrialandbusinessmanagementthattheyaretrue.Ifexperimentsareplannedandcarriedoutaccordingtoplanasfaithfullyasthereportsinthesciencejournalsindicatethenitisperfectlylogicalformanagementtoexpectresearchtoproduceresultsmeasurableindollarsandcents.Itisentirelyreasonableforauditorstobelievethatscientistswhoknowexactlywheretheyaregoingandhowtheywillgetthereshouldnotbedistractedbythenecessityofkeepingoneeyeonthecashregisterwhiletheothereyeisonthemicroscope.Norifregularityandconformitytoastandardpatternareasdesirabletothescientistasthewritingofhispaperswouldappeartoreflectismanagementtobeblamedfordiscriminatingagainsttheoddballsamongresearchersinfavorofmoreconventionalthinkerswhoworkwellwiththeteam. Theauthorimpliesthattheresultsofscientificresearch____________.
Scienceinpracticedependsfarlessontheexperimentsitpreparesthanonthepreparednessofthemindsofthemenwhowatchtheexperiments.SirIsaacNewtonsupposedlydiscoveredgravitythroughthefallofanapple.Appleshadbeenfallinginmanyplacesforcenturiesandthousandsofpeoplehadseenthemfall.ButNewtonforyearshadbeencuriousaboutthecauseoftheorbitalmotionofthemoonandplanets.WhatkepttheminplaceWhydidn’’ttheyfalloutoftheskyThefactthattheapplefelldowntowardtheearthandnotupintothetreeansweredthequestionhehadbeenaskinghimselfaboutthoselargerfruitsoftheheavensthemoonandtheplanets. HowmanymenwouldhaveconsideredthepossibilityofanapplefallingupintothetreeNewtondidbecausehewasnottryingtopredictanything.Hewasjustwondering.Hismindwasreadyfortheunpredictable.Unpredictabilityispartoftheessentialnatureofresearch.Ifyoudon’’thaveunpredictablethingsyoudon’’thaveresearch.Scientiststendtoforgetthiswhenwritingtheircutanddriedreportsforthetechnicaljournalsbuthistoryisfilledwithexamplesofit. Intalkingtosomescientistsparticularlyyoungeronesyoumightgathertheimpressionthattheyfindthescientificmethodasubstituteforimaginativethought.I’’veattendedresearchconferenceswhereascientisthasbeenaskedwhathethinksabouttheadvisabilityofcontinuingacertainexperiment.Thescientisthasfrownedlookedatthegraphsandsaidthedataarestillinconclusive.WeknowthatthemenfromthebudgetofficehavesaidbutwhatdoyouthinkIsitworthwhilegoingonWhatdoyouthinkwemightexpectThescientisthasbeenshockedathavingevenbeenaskedtospeculate. Whatthisamountstoofcourseisthatthescientisthasbecomethevictimofhisownwritings.Hehasputforwardunquestionedclaimssoconsistentlythathenotonlybelievesthemhimselfbuthasconvincedindustrialandbusinessmanagementthattheyaretrue.Ifexperimentsareplannedandcarriedoutaccordingtoplanasfaithfullyasthereportsinthesciencejournalsindicatethenitisperfectlylogicalformanagementtoexpectresearchtoproduceresultsmeasurableindollarsandcents.Itisentirelyreasonableforauditorstobelievethatscientistswhoknowexactlywheretheyaregoingandhowtheywillgetthereshouldnotbedistractedbythenecessityofkeepingoneeyeonthecashregisterwhiletheothereyeisonthemicroscope.Norifregularityandconformitytoastandardpatternareasdesirabletothescientistasthewritingofhispaperswouldappeartoreflectismanagementtobeblamedfordiscriminatingagainsttheoddballsamongresearchersinfavorofmoreconventionalthinkerswhoworkwellwiththeteam. Theauthorassertsthatscientists__________________.
下列等式或结论正确的是
MoneyspentonadvertisingismoneyspentaswellasanyIknowof.Itservesdirectlytoassistarapiddistributionofgoodsatreasonablepricestherebyestablishingafirmhomemarketandsomakingitpossibletoprovideforexportatcompetitiveprices.Bydrawingattentiontonewideasithelpsenormouslytoraisestandardsofliving.Byhelpingtoincreasedemanditensuresanincreasedneedforlabourandisthereforeaneffectivewaytofightunemployment.Itlowersthecostsofmanyservices:withoutadvertisementsyourdailynewspaperwouldcostfourtimesasmuchthepriceofyourtelevisionlicencewouldneedtobedoubledandtravelbybusortubewouldcost20percentmore. Andperhapsmostimportantofalladvertisingprovidesaguaranteeofreasonablevalueintheproductsandservicesyoubuy.Apartfromthefactthattwenty-sevenActsofParliamentgovernthetermsofadvertisingnoregularadvertiserdarepromoteaproductthatfailstoliveuptothepromiseofhisadvertisements.Hemightfoolsomepeopleforalittlewhilethroughmisleadingadvertising.Hewillnotdosoforlongformercifullythepublichasthegoodsensenottobuytheinferiorarticlemorethanonce.IfyouseeanarticleconsistentlyadvertiseditisthesurestproofIknowthatthearticledoeswhatisclaimedforitandthatitrepresentsgoodvalue. AdvertisingdoesmoreforthematerialbenefitofthecommunitythananyotherforceIcanthinkof. ThereisonepointIfeelIoughttotouchon.RecentlyIheardawell-knowntelevisionpersonalitydeclarethathewasagainstadvertisingbecauseitpersuadesratherthaninforms.Hewasdrawingexcessivelyfinedistinctions.Ofcourseadvertisingseekstopersuade. Ifitsmessagewereconfinedmerelytoinformation―andthatinitselfwouldbedifficultifnotimpossibletoachieveforevenadetailsuchasthechoiceofthecolourofashirtissubtletypersuasiveadvertisingwouldbesoboringthatnoonewouldpayanyattention.Butperhapsthatiswhatthewell-knowntelevisionpersonalitywants. InthepassagewhichofthefollowingisNOTincludedintheadvantagesofadvertising
设且f[ψx]=lnx则∫ψxdx=______．
设则下列结论 ①在[-11]上f1x存在原函数②存在定积分③存在f'20 ④在[-11]上f2x存在原函数中正确的是
设则根据定积分的几何意义可知下列结论正确的是
设
WhataccountsforthegreatoutburstofmajorinventionsinearlyAmerica―breakthroughssuchasthetelegraphthesteamboatandtheweavingmachine AmongthemanyshapingfactorsIwouldsingleoutthecountry’’sexcellentelementaryschools;alaborforcethatwelcomedthenewtechnology;thepracticeofgivingpremiumstoinventors;andabovealltheAmericangeniusfornonverbalspatialthinkingaboutthingstechnological. WhymentiontheelementaryschoolsBecausethankstotheseschoolsourearlymechanicespeciallyintheNewEnglandandMiddleAtlanticstatesweregenerallyliterateandathomeinarithmeticandinsomeaspectsofgeometryandtrigonometry. AcuteforeignobserversrelatedAmericanadaptivenessandinventivenesstothiseducationaladvantage.AsamemberofaBritishcommissionvisitingherein1853reportedWithamindpreparedbythoroughschooldisciplinetheAmericanboydevelopsrapidlyintotheskilledworkman. Afurtherstimulustoinventioncamefromthepremiumsystemwhichprecededourpatentsystemandforyearsranparallelwithit.Thisapproachoriginatedabroadofferedinventorsmedalscashprizesandotherincentives. IntheUnitedStatesmultitudesofpremiumsfornewdeviceswereawardedatcountryfairsandattheindustrialfairsinmajorcities.Americansflockedtothesefairstoadmirethenewmachinesandthustorenewtheirfaithinthebeneficenceoftechnologicaladvance. GiventhisoptimisticapproachtotechnologicalinnovationtheAmericanworkertookreadilytothatspecialkindofnonverbalthinkingrequiredinmechanicaltechnology.AsEugeneFergusonhaspointedoutAtechnologistthinksaboutobjectsthatcannotbereducedtounambiguousverbaldescriptions;theyaredealtwithinhismindbyavisualnonverbalprocess...Thedesignerandtheinventor...areabletoassembleandmanipulateintheirmindsdevicesthatasyetdonotexist. Thisnonverbalspatialthinkingcanbejustascreativeaspaintingandwriting.RobertFultononcewroteThemechanicshouldsitdownamongleversscrewswedgeswheelsetc.likeapoetamongthelettersofthealphabetconsideringthemasanexhibitionofhisthoughtsinwhichanewarrangementtransmitsanewidea. Whenalltheseshapingforces―schoolsopenattitudesthepremiumsystemageniusforspatialthinking―interactedwithoneanotherontherichU.S.mainlandtheyproducedthatAmericancharacteristicemulation.Todaythatwordimpliesmereimitation.Butinearliertimesitmeantafriendlybutcompetitivestrivingforfameandexcellence. ItisimpliedthatadaptivenessandinventivenessoftheearlyAmericanmechanics_________________.
Inlessthan30years’’timetheStarTrekholodeckwillbeareality.Directlinksbetweenthebrain’’snervoussystemandacomputerwillalsocreatefullsensoryvirtualenvironmentsallowingvirtualvacationslikethoseinthefilmTotalRecall. 71.Therewillbetelevisionchatshowshostedbyrobotsandcarswithpollutionmonitorsthatwilldisablethemwhentheyoffend.72.Childrenwillplaywithdollsequippedwithpersonalitychipscomputerswithin-builtpersonalitieswillberegardedasworkmatesratherthantoolsrelaxationwillbeinfrontofsmell-televisionanddigitalagewillhavearrived. AccordingtoBT’’sfuturologistIanPearsontheseareamongthedevelopmentsscheduledforthefirstfewdecadesofthenewmillenniumaperiodof1000yearswhensupercomputerswilldramaticallyaccelerateprogressinallareasoflife. 73.Pearsonhaspiecedtogethertheworkofhundredsofresearchersaroundtheworldtoproduceauniquemillenniumtechnologycalendarthatgivesthelatestdateswhenwecanexpecthundredsorkeybreakthroughsanddiscoveriestotakeplace.Someofthebiggestdevelopmentswillbeinmedicineincludinganextendedlifeexpectancyanddozensofartificialorganscomingintousebetweennowand2040. Pearsonalsopredictsabreakthroughincomputer-humanlinks.BylinkingdirectlytoournervoussystemcomputerscouldpickupwhatwefeelandhopefullysimulatefeelingtoosothatwecanstarttodevelopfullsensoryenvironmentsratherliketheholidaysinTotalRecallortheStarTrekholodeckhesays.74.ButthatPearsonpointsoutisonlythestartofman-machineintegration:Itwillbethebeginningofthelongprocessofintegrationthatwillultimatelyleadtoafullyelectronichumanbeforetheendofthenextcentury. ThroughhisresearchPearsonisabletoputdatestomostofthebreakthroughsthatcanbepredicted.Howevertherearestillnoforecastsforwhenfaster-that-lighttravelwillbeavailableorwhenhumancloningwillbeperfectedorwhentimetravelwillbepossible.Buthedoesexpectsocialproblemsasaresultoftechnologicaladvances.Aboominneighborhoodsurveillancecameraswillforexamplecauseproblemsin2010whilethearrivalofsyntheticlifelikerobotswillmeanpeoplemaynotbeabletodistinguishbetweentheirhumanfriendsandthedroids.75.Andhomeapplianceswillalsobecomesosmartthatcontrollingandoperatingthemwillresultinthebreakoutofanewpsychologicaldisorder--kitchenrage.
下列命题①若函数FxΦx是同一个函数fx在区间I上的两个原函数则其差Fx-Φx等于确定的常数②设F'xΦ'xfx在集合D上有定义且满足F'x=Φ'x=fx则Fx-Φx≡C③若取积分常数C=0则可积函数fx的原函数唯一④若fx在区间I上有原函数则fx的任意两个原函数之和必为2fx的原函数中正确的是
设则Fx
WhataccountsforthegreatoutburstofmajorinventionsinearlyAmerica―breakthroughssuchasthetelegraphthesteamboatandtheweavingmachine AmongthemanyshapingfactorsIwouldsingleoutthecountry’’sexcellentelementaryschools;alaborforcethatwelcomedthenewtechnology;thepracticeofgivingpremiumstoinventors;andabovealltheAmericangeniusfornonverbalspatialthinkingaboutthingstechnological. WhymentiontheelementaryschoolsBecausethankstotheseschoolsourearlymechanicespeciallyintheNewEnglandandMiddleAtlanticstatesweregenerallyliterateandathomeinarithmeticandinsomeaspectsofgeometryandtrigonometry. AcuteforeignobserversrelatedAmericanadaptivenessandinventivenesstothiseducationaladvantage.AsamemberofaBritishcommissionvisitingherein1853reportedWithamindpreparedbythoroughschooldisciplinetheAmericanboydevelopsrapidlyintotheskilledworkman. Afurtherstimulustoinventioncamefromthepremiumsystemwhichprecededourpatentsystemandforyearsranparallelwithit.Thisapproachoriginatedabroadofferedinventorsmedalscashprizesandotherincentives. IntheUnitedStatesmultitudesofpremiumsfornewdeviceswereawardedatcountryfairsandattheindustrialfairsinmajorcities.Americansflockedtothesefairstoadmirethenewmachinesandthustorenewtheirfaithinthebeneficenceoftechnologicaladvance. GiventhisoptimisticapproachtotechnologicalinnovationtheAmericanworkertookreadilytothatspecialkindofnonverbalthinkingrequiredinmechanicaltechnology.AsEugeneFergusonhaspointedoutAtechnologistthinksaboutobjectsthatcannotbereducedtounambiguousverbaldescriptions;theyaredealtwithinhismindbyavisualnonverbalprocess...Thedesignerandtheinventor...areabletoassembleandmanipulateintheirmindsdevicesthatasyetdonotexist. Thisnonverbalspatialthinkingcanbejustascreativeaspaintingandwriting.RobertFultononcewroteThemechanicshouldsitdownamongleversscrewswedgeswheelsetc.likeapoetamongthelettersofthealphabetconsideringthemasanexhibitionofhisthoughtsinwhichanewarrangementtransmitsanewidea. Whenalltheseshapingforces―schoolsopenattitudesthepremiumsystemageniusforspatialthinking―interactedwithoneanotherontherichU.S.mainlandtheyproducedthatAmericancharacteristicemulation.Todaythatwordimpliesmereimitation.Butinearliertimesitmeantafriendlybutcompetitivestrivingforfameandexcellence. Thebesttitleforthispassagemightbe_________________.
设fx及gx在[ab]上连续则下列命题①若在[ab]上fx≥0则fx≠0②若在[ab]上fx≥0且则在[ab]上fx=0③若fx在[ab]的任意子区间[αβ]上有则fx=0④若在[ab]上fx≤gx且则在[ab]上fx≡gx中正确的是
设a≠b则A______B______．
It’’safunnythinghappiness.Peoplerefertoitassomethingtheywantsomethingmissingasifitcouldbesecurediftheyonlyknewwheretofindit.Lackofitisblamedonpastrelationshipsandhopeforitplacedonfuturelovers.Desireforitbecomesarestlessquest.Yetoverandagainintherapyitisclearthatahungrypursuitfortheillusivestateofhappinessonlyendsinfrustrationandyetmoreunhappiness. WhenIaskamanwho’’sjustturned40andwantstotrypsychotherapytotellmeaboutthedisappointmentshementionshereelsoffalist:aloveaffairthatlostitszest;aworkprojectruinedbyacolleague;aholidayspoiledbytheweather;aplanhaltedbyillhealth.Allwerepotentialroutestohappiness.Anditisthisendlessfeelingofthingsbeingspoiltthatmakeshimfeelletdownbylifeandunhappy. Hetellsmethathehadbeenawillfulchild.Hewashesaysspoiltrottenbyverylovingparents.Theyhadsufferedmuchhardshipintheirownlivesandwhenhardworkandgoodluckmadethemwellofftheydecidedthathetheironlysonwouldhavealltheyhadlackedandmore. Hehadwantedfornothing.Yetthiscamewithacost.Forhavingeverythingonaplatebeforehehadevendevelopedanappetitehadrobbedhimofthechancetoreachandstruggleforsomethingmeaningfulandofhisveryown.Therehadneverbeenanemptyspacehehadenjoyedworkingtofill.Littlewonderhewasunabletoremainattachedtoanythingoranyoneafterfrustrationsetin.Workingthroughdifficultysimplyhadn’’teverbeenaskedofhim. Whilehopefullyaby-productofdevelopingemotionalmaturityhappinesswasnotItoldhimaspecifictherapeuticaim.Buttherapycouldofferthechallengetostaywithandsograduallyunderstandthemeaningofhisunhappinessratherthanboltingwhenthegoinggotrough.Thenotionthatwecanuncoverameaningwithinoursufferingsupportsthewholetherapeuticventure.Byworkingtowardsunderstandingthereasonsforhisdisappointmentsthismanhadthechancetobeginreshapinghisownlifejourney.Thiswasunlikelytogivehimhappinessasagivenconstantbutcouldenablehimtodevelopsomethingfarmoreimportant.AsC.G.JungthefounderofAnalyticalPsychologysaid:Theprincipalaimofpsychotherapyisnottotransportthepatienttoanimpossiblestateofhappinessbuttohelphimacquiresteadfastnessandphilosophicpatienceinthefaceofsuffering.Lifedemandsforitscompletionandfulfillmentabalancebetweenjoyandsorrow. ThephraseremainattachedtoPar.4mostprobablymeanscontinueto
Inlessthan30years’’timetheStarTrekholodeckwillbeareality.Directlinksbetweenthebrain’’snervoussystemandacomputerwillalsocreatefullsensoryvirtualenvironmentsallowingvirtualvacationslikethoseinthefilmTotalRecall. 71.Therewillbetelevisionchatshowshostedbyrobotsandcarswithpollutionmonitorsthatwilldisablethemwhentheyoffend.72.Childrenwillplaywithdollsequippedwithpersonalitychipscomputerswithin-builtpersonalitieswillberegardedasworkmatesratherthantoolsrelaxationwillbeinfrontofsmell-televisionanddigitalagewillhavearrived. AccordingtoBT’’sfuturologistIanPearsontheseareamongthedevelopmentsscheduledforthefirstfewdecadesofthenewmillenniumaperiodof1000yearswhensupercomputerswilldramaticallyaccelerateprogressinallareasoflife. 73.Pearsonhaspiecedtogethertheworkofhundredsofresearchersaroundtheworldtoproduceauniquemillenniumtechnologycalendarthatgivesthelatestdateswhenwecanexpecthundredsorkeybreakthroughsanddiscoveriestotakeplace.Someofthebiggestdevelopmentswillbeinmedicineincludinganextendedlifeexpectancyanddozensofartificialorganscomingintousebetweennowand2040. Pearsonalsopredictsabreakthroughincomputer-humanlinks.BylinkingdirectlytoournervoussystemcomputerscouldpickupwhatwefeelandhopefullysimulatefeelingtoosothatwecanstarttodevelopfullsensoryenvironmentsratherliketheholidaysinTotalRecallortheStarTrekholodeckhesays.74.ButthatPearsonpointsoutisonlythestartofman-machineintegration:Itwillbethebeginningofthelongprocessofintegrationthatwillultimatelyleadtoafullyelectronichumanbeforetheendofthenextcentury. ThroughhisresearchPearsonisabletoputdatestomostofthebreakthroughsthatcanbepredicted.Howevertherearestillnoforecastsforwhenfaster-that-lighttravelwillbeavailableorwhenhumancloningwillbeperfectedorwhentimetravelwillbepossible.Buthedoesexpectsocialproblemsasaresultoftechnologicaladvances.Aboominneighborhoodsurveillancecameraswillforexamplecauseproblemsin2010whilethearrivalofsyntheticlifelikerobotswillmeanpeoplemaynotbeabletodistinguishbetweentheirhumanfriendsandthedroids.75.Andhomeapplianceswillalsobecomesosmartthatcontrollingandoperatingthemwillresultinthebreakoutofanewpsychologicaldisorder--kitchenrage. Inlessthan30years’’timetheStarTrekholodeckwillbeareality.Directlinksbetweenthebrain’’snervoussystemandacomputerwillalsocreatefullsensoryvirtualenvironmentsallowingvirtualvacationslikethoseinthefilmTotalRecall. 71.Therewillbetelevisionchatshowshostedbyrobotsandcarswithpollutionmonitorsthatwilldisablethemwhentheyoffend.72.Childrenwillplaywithdollsequippedwithpersonalitychipscomputerswithin-builtpersonalitieswillberegardedasworkmatesratherthantoolsrelaxationwillbeinfrontofsmell-televisionanddigitalagewillhavearrived. AccordingtoBT’’sfuturologistIanPearsontheseareamongthedevelopmentsscheduledforthefirstfewdecadesofthenewmillenniumaperiodof1000yearswhensupercomputerswilldramaticallyaccelerateprogressinallareasoflife. 73.Pearsonhaspiecedtogethertheworkofhundredsofresearchersaroundtheworldtoproduceauniquemillenniumtechnologycalendarthatgivesthelatestdateswhenwecanexpecthundredsorkeybreakthroughsanddiscoveriestotakeplace.Someofthebiggestdevelopmentswillbeinmedicineincludinganextendedlifeexpectancyanddozensofartificialorganscomingintousebetweennowand2040. Pearsonalsopredictsabreakthroughincomputer-humanlinks.BylinkingdirectlytoournervoussystemcomputerscouldpickupwhatwefeelandhopefullysimulatefeelingtoosothatwecanstarttodevelopfullsensoryenvironmentsratherliketheholidaysinTotalRecallortheStarTrekholodeckhesays.74.ButthatPearsonpointsoutisonlythestartofman-machineintegration:Itwillbethebeginningofthelongprocessofintegrationthatwillultimatelyleadtoafullyelectronichumanbeforetheendofthenextcentury. ThroughhisresearchPearsonisabletoputdatestomostofthebreakthroughsthatcanbepredicted.Howevertherearestillnoforecastsforwhenfaster-that-lighttravelwillbeavailableorwhenhumancloningwillbeperfectedorwhentimetravelwillbepossible.Buthedoesexpectsocialproblemsasaresultoftechnologicaladvances.Aboominneighborhoodsurveillancecameraswillforexamplecauseproblemsin2010whilethearrivalofsyntheticlifelikerobotswillmeanpeoplemaynotbeabletodistinguishbetweentheirhumanfriendsandthedroids.75.Andhomeapplianceswillalsobecomesosmartthatcontrollingandoperatingthemwillresultinthebreakoutofanewpsychologicaldisorder--kitchenrage.
设a＞0fx在[-aa]上连续则在[-aa]上
下列命题正确的是
设fx在-∞+∞内连续则下列叙述正确的是
MoneyspentonadvertisingismoneyspentaswellasanyIknowof.Itservesdirectlytoassistarapiddistributionofgoodsatreasonablepricestherebyestablishingafirmhomemarketandsomakingitpossibletoprovideforexportatcompetitiveprices.Bydrawingattentiontonewideasithelpsenormouslytoraisestandardsofliving.Byhelpingtoincreasedemanditensuresanincreasedneedforlabourandisthereforeaneffectivewaytofightunemployment.Itlowersthecostsofmanyservices:withoutadvertisementsyourdailynewspaperwouldcostfourtimesasmuchthepriceofyourtelevisionlicencewouldneedtobedoubledandtravelbybusortubewouldcost20percentmore. Andperhapsmostimportantofalladvertisingprovidesaguaranteeofreasonablevalueintheproductsandservicesyoubuy.Apartfromthefactthattwenty-sevenActsofParliamentgovernthetermsofadvertisingnoregularadvertiserdarepromoteaproductthatfailstoliveuptothepromiseofhisadvertisements.Hemightfoolsomepeopleforalittlewhilethroughmisleadingadvertising.Hewillnotdosoforlongformercifullythepublichasthegoodsensenottobuytheinferiorarticlemorethanonce.IfyouseeanarticleconsistentlyadvertiseditisthesurestproofIknowthatthearticledoeswhatisclaimedforitandthatitrepresentsgoodvalue. AdvertisingdoesmoreforthematerialbenefitofthecommunitythananyotherforceIcanthinkof. ThereisonepointIfeelIoughttotouchon.RecentlyIheardawell-knowntelevisionpersonalitydeclarethathewasagainstadvertisingbecauseitpersuadesratherthaninforms.Hewasdrawingexcessivelyfinedistinctions.Ofcourseadvertisingseekstopersuade. Ifitsmessagewereconfinedmerelytoinformation―andthatinitselfwouldbedifficultifnotimpossibletoachieveforevenadetailsuchasthechoiceofthecolourofashirtissubtletypersuasiveadvertisingwouldbesoboringthatnoonewouldpayanyattention.Butperhapsthatiswhatthewell-knowntelevisionpersonalitywants. Intheauthor’’sopinion__________________.
Inlessthan30years’’timetheStarTrekholodeckwillbeareality.Directlinksbetweenthebrain’’snervoussystemandacomputerwillalsocreatefullsensoryvirtualenvironmentsallowingvirtualvacationslikethoseinthefilmTotalRecall. 71.Therewillbetelevisionchatshowshostedbyrobotsandcarswithpollutionmonitorsthatwilldisablethemwhentheyoffend.72.Childrenwillplaywithdollsequippedwithpersonalitychipscomputerswithin-builtpersonalitieswillberegardedasworkmatesratherthantoolsrelaxationwillbeinfrontofsmell-televisionanddigitalagewillhavearrived. AccordingtoBT’’sfuturologistIanPearsontheseareamongthedevelopmentsscheduledforthefirstfewdecadesofthenewmillenniumaperiodof1000yearswhensupercomputerswilldramaticallyaccelerateprogressinallareasoflife. 73.Pearsonhaspiecedtogethertheworkofhundredsofresearchersaroundtheworldtoproduceauniquemillenniumtechnologycalendarthatgivesthelatestdateswhenwecanexpecthundredsorkeybreakthroughsanddiscoveriestotakeplace.Someofthebiggestdevelopmentswillbeinmedicineincludinganextendedlifeexpectancyanddozensofartificialorganscomingintousebetweennowand2040. Pearsonalsopredictsabreakthroughincomputer-humanlinks.BylinkingdirectlytoournervoussystemcomputerscouldpickupwhatwefeelandhopefullysimulatefeelingtoosothatwecanstarttodevelopfullsensoryenvironmentsratherliketheholidaysinTotalRecallortheStarTrekholodeckhesays.74.ButthatPearsonpointsoutisonlythestartofman-machineintegration:Itwillbethebeginningofthelongprocessofintegrationthatwillultimatelyleadtoafullyelectronichumanbeforetheendofthenextcentury. ThroughhisresearchPearsonisabletoputdatestomostofthebreakthroughsthatcanbepredicted.Howevertherearestillnoforecastsforwhenfaster-that-lighttravelwillbeavailableorwhenhumancloningwillbeperfectedorwhentimetravelwillbepossible.Buthedoesexpectsocialproblemsasaresultoftechnologicaladvances.Aboominneighborhoodsurveillancecameraswillforexamplecauseproblemsin2010whilethearrivalofsyntheticlifelikerobotswillmeanpeoplemaynotbeabletodistinguishbetweentheirhumanfriendsandthedroids.75.Andhomeapplianceswillalsobecomesosmartthatcontrollingandoperatingthemwillresultinthebreakoutofanewpsychologicaldisorder--kitchenrage.
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