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设二维随机向量XY在边长为1的正方形区域内服从均匀分布该正方形的中心在坐标原点对角线在坐标轴上.Ⅰ求
已知集合{xy|x∈[02]y∈[-11]}.1若xy∈Z.求x+y≥0的概率2若xy∈R.求x+y
集合A.={x|1≤x≤5}集合B.={y|2≤y≤6}.1若x∈A.y∈B.且均为整数求x=y的概
设曲线y=yxx>0是微分方程2y+y’-y=4-6xe-x的一个特解此曲线经过原点且在原点处的切线
设y=yx是由[*]确定的隐函数求y’0和y0的值.
已知y与x﹣3成反比例且当x=4时y=5求1y与x之间的函数关系式2当x=2时求y的值3当y=1时求
已知函数y=-2x-6.1求当x=-4时y的值当y=-2时x的值.2画出函数图象.3如果y的取值范围
已知y=yl+y2y1与x成正比例y2与x成反比例并且当x=﹣1时y=﹣1当x=2时y=5.1求y关
在等式y=ax+b中当x=1时y=-3当x=-3时y=13.1求ab的值2当-1
设y=yx是一向上凸的连续曲线其上任意一点xy处的曲率为[*]且此曲线上点01处的切线方程为y=x+
假设xy的值都是0执行下列程序段dowhile.t.x=x+1y=y+xifx>=5exitendi
求0到5的和
求1到5的积
求0到4的和
不知道
已知x=10101100y=11110011求xVy=xΛy=x⊕y=x⊕y=
设y=yx是由方程[*]确定的隐函数求y’.
设二维离散型随机变量XY的概率分别为 Ⅰ求P{X=2Y}. Ⅱ求CovX-YY.
已知函数y=y1-y2y1与x成反比例y2与x-2成正比例且当x=1时y=-1当x=3时y=5.①求
函数y=ax2a≠0与直线y=2x-3交于点1b求1a和b的值2求抛物线y=ax2的解析式并求顶点坐
已知x=1+2my=1﹣m.1若点xy恰为抛物线y=ax2﹣ax+1的顶点求a的值2求y关于x的函数
设fxy=x-6y+8求函数fxy在点xy处的最大的方向导数gxy并求gxy在区域D=xy|x2+y
已知集合Z.={xy|x∈[02]y∈[-11]}1若xy∈Z.求x+y≥0的概率2若xy∈R.求x
设曲线y=yxx>0是微分方程2y+y’-y=4-6xe-x的一个特解此曲线经过原点且在原点处的切线
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感性知识分为感知和______两种水平理性知识包括概念和______两种形式.
Behindourhouseisthestartofafascinatingtrail小径.Thistrailisoneoftheoldroadsthatwindthroughuntoldmilesofforest.My36BeansandIwalkthetrailfrequently.NormallyBeanssniffsalongsidethetrailtofollowthesmellofadeertrackorexploresomecauseknownonlytohim. Beansisawhitedogquitehandsomeandverysmart.Henotonlyunderstandswhatwetellhimbutalsooftenmakessoundsasifheweretryingto37back. Onemorningwetookadifferentroutewhichledustoanunfamiliartrail.Iwassurethistrailwouldeventuallyleadustoourfamiliar38.Butno.Weseemedtobefaroffcourse.AftertwohoursIsuddenlyrealizedthatBeansprobably39thewayhome.SoIurged"Beanstakemehome."Herandownanewtrail.Butitmerelyledtoanintersection岔道口oftrails. Soonitbecame40thatweweregettingnowhere.Ibegantopicturetherestofthedayinthe41withoutfoodordrink.Wehadwalkedabouttenmiles.ButBeansseemedtotally42Thesniffingandexploringwasgoingwellforhim. Finallywe43acrossroadnearahighway.LadyLucksuggestedIshouldturnleft.Wedidand44reachedacottagebesideafield.Iknockedonthedoorandexplainedmysituationtoanoldman.Helaughedandthendroveushome. SinceouradventureI45thatBeansprobablyknewallalonghowtogethome. Hewasjusthavingtoomuchfanexploringnewtrails. 43
古希腊百科全书式的哲学家______首次提出了教育遵循自然的观点他倡导的和谐教育成为后来全面发展教育的思想渊源.
儿童多动综合征是小学生中最为常见的一种以注意力缺陷和活动过度为主要特征的行为障碍综合征其高峰发病年龄为.
Directions:TranslatethefollowingsentencesintoEnglish.没有仔细考虑之前不要做决定
Opinionpollsarenowbeginningtoshowthatwhoeveristoblameandwhateverhappensfromnowonhighunemploymentisprobablyheretostay.Thismeansweshallhavetofindwaysofsharingtheavailableemploymentmorewidely.Butweneedtogofurther.Wemustasksomefundamentalquestionsaboutthefuturework.ShouldwecontinuetotreatemploymentasthenormShouldwenotratherencouragemanywaysforself-respectingpeopletoworkShouldwenotcreateconditionsinwhichmanyofuscanworkforourselvesratherthanforanemployerShouldwenotaimtorevivethehouseholdandtheneighborhoodaswellasthefactoryandtheofficeascentersofproductionandworkTheindustrialagehasbeentheonlyperiodofhumanhistoryinwhichmostpeople’sworkhastakentheformofjobs.Theindustrialagemaynowbecomingtoanendandsomeofthechangesinworkpatternswhichitbroughtmayhavetobereversed.Thisseemsadauntingthought.Butinfactitcouldoffertheprospectofabetterfutureforwork.Universalemploymentasitshistoryshowshasnotmeanteconomicfreedom.Employmentbecamewidespreadwhentheenclosuresofthe17thand18thcenturiesmademanypeopledependentonpaidworkbydeprivingthemoftheuseofthelandandthusofthemeanstoprovidealivingforthemselves.Thenthefactorysystemdestroyedthecottageindustriesandremovedworkfrompeople’shomes.Laterastransportimprovedfirstbyrailandthenbyroadpeoplecommutedlongerdistancestotheirplacesofemploymentuntileventuallymanypeople’sworklostallconnectionwiththeirhomelivesandtheplacesinwhichtheylive.Meanwhileemploymentputwomenatadisadvantage.Inpreindustrialtimesmenandwomenhadsharedtheproductiveworkofthehouseholdandvillagecommunity.Nowitbecamecustomaryforthehusbandtogoouttopaidemploymentleavingtheunpaidworkofthehomeandfamiliestohiswife.Taxandbenefitregulationsstillassumethisnormtodayandrestrictmoreflexiblesharingofworkrolesbetweenthesexes.Itwasnotonlywomenwhoseworkstatussuffered.Asemploymentbecamethedominantformofworkyoungpeopleandoldpeoplewereexcluded—aproblemnowasmoreteenagersbecomefrustratedatschoolandmoreretiredpeoplewanttoliveactivelives.Allthismaynowhavetochange.Thetimehascertainlycometoswitchsomeeffortandresourcesawayfromtheidealistgoalcrea-tingjobsforalltotheurgentpracticaltaskofhelpingmanypeopletomanagewithoutfull-timejobs.WhichoftheibllowingisNOTsuggestedasapossiblemeanstocopewiththecurrentsituation9
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Opinionpollsarenowbeginningtoshowthatwhoeveristoblameandwhateverhappensfromnowonhighunemploymentisprobablyheretostay.Thismeansweshallhavetofindwaysofsharingtheavailableemploymentmorewidely.Butweneedtogofurther.Wemustasksomefundamentalquestionsaboutthefuturework.ShouldwecontinuetotreatemploymentasthenormShouldwenotratherencouragemanywaysforself-respectingpeopletoworkShouldwenotcreateconditionsinwhichmanyofuscanworkforourselvesratherthanforanemployerShouldwenotaimtorevivethehouseholdandtheneighborhoodaswellasthefactoryandtheofficeascentersofproductionandworkTheindustrialagehasbeentheonlyperiodofhumanhistoryinwhichmostpeople’sworkhastakentheformofjobs.Theindustrialagemaynowbecomingtoanendandsomeofthechangesinworkpatternswhichitbroughtmayhavetobereversed.Thisseemsadauntingthought.Butinfactitcouldoffertheprospectofabetterfutureforwork.Universalemploymentasitshistoryshowshasnotmeanteconomicfreedom.Employmentbecamewidespreadwhentheenclosuresofthe17thand18thcenturiesmademanypeopledependentonpaidworkbydeprivingthemoftheuseofthelandandthusofthemeanstoprovidealivingforthemselves.Thenthefactorysystemdestroyedthecottageindustriesandremovedworkfrompeople’shomes.Laterastransportimprovedfirstbyrailandthenbyroadpeoplecommutedlongerdistancestotheirplacesofemploymentuntileventuallymanypeople’sworklostallconnectionwiththeirhomelivesandtheplacesinwhichtheylive.Meanwhileemploymentputwomenatadisadvantage.Inpreindustrialtimesmenandwomenhadsharedtheproductiveworkofthehouseholdandvillagecommunity.Nowitbecamecustomaryforthehusbandtogoouttopaidemploymentleavingtheunpaidworkofthehomeandfamiliestohiswife.Taxandbenefitregulationsstillassumethisnormtodayandrestrictmoreflexiblesharingofworkrolesbetweenthesexes.Itwasnotonlywomenwhoseworkstatussuffered.Asemploymentbecamethedominantformofworkyoungpeopleandoldpeoplewereexcluded—aproblemnowasmoreteenagersbecomefrustratedatschoolandmoreretiredpeoplewanttoliveactivelives.Allthismaynowhavetochange.Thetimehascertainlycometoswitchsomeeffortandresourcesawayfromtheidealistgoalcrea-tingjobsforalltotheurgentpracticaltaskofhelpingmanypeopletomanagewithoutfull-timejobs.Whatisthemainideaofthepassage
如图O中弦AD∥BCDA=DC∠AOC=160°则∠BCO等于
已知集合M=x|x2<4N=x|x2-2x-3<0则集合M∪N
Behindourhouseisthestartofafascinatingtrail小径.Thistrailisoneoftheoldroadsthatwindthroughuntoldmilesofforest.My36BeansandIwalkthetrailfrequently.NormallyBeanssniffsalongsidethetrailtofollowthesmellofadeertrackorexploresomecauseknownonlytohim. Beansisawhitedogquitehandsomeandverysmart.Henotonlyunderstandswhatwetellhimbutalsooftenmakessoundsasifheweretryingto37back. Onemorningwetookadifferentroutewhichledustoanunfamiliartrail.Iwassurethistrailwouldeventuallyleadustoourfamiliar38.Butno.Weseemedtobefaroffcourse.AftertwohoursIsuddenlyrealizedthatBeansprobably39thewayhome.SoIurged"Beanstakemehome."Herandownanewtrail.Butitmerelyledtoanintersection岔道口oftrails. Soonitbecame40thatweweregettingnowhere.Ibegantopicturetherestofthedayinthe41withoutfoodordrink.Wehadwalkedabouttenmiles.ButBeansseemedtotally42Thesniffingandexploringwasgoingwellforhim. Finallywe43acrossroadnearahighway.LadyLucksuggestedIshouldturnleft.Wedidand44reachedacottagebesideafield.Iknockedonthedoorandexplainedmysituationtoanoldman.Helaughedandthendroveushome. SinceouradventureI45thatBeansprobablyknewallalonghowtogethome. Hewasjusthavingtoomuchfanexploringnewtrails. 37
Behindourhouseisthestartofafascinatingtrail小径.Thistrailisoneoftheoldroadsthatwindthroughuntoldmilesofforest.My36BeansandIwalkthetrailfrequently.NormallyBeanssniffsalongsidethetrailtofollowthesmellofadeertrackorexploresomecauseknownonlytohim. Beansisawhitedogquitehandsomeandverysmart.Henotonlyunderstandswhatwetellhimbutalsooftenmakessoundsasifheweretryingto37back. Onemorningwetookadifferentroutewhichledustoanunfamiliartrail.Iwassurethistrailwouldeventuallyleadustoourfamiliar38.Butno.Weseemedtobefaroffcourse.AftertwohoursIsuddenlyrealizedthatBeansprobably39thewayhome.SoIurged"Beanstakemehome."Herandownanewtrail.Butitmerelyledtoanintersection岔道口oftrails. Soonitbecame40thatweweregettingnowhere.Ibegantopicturetherestofthedayinthe41withoutfoodordrink.Wehadwalkedabouttenmiles.ButBeansseemedtotally42Thesniffingandexploringwasgoingwellforhim. Finallywe43acrossroadnearahighway.LadyLucksuggestedIshouldturnleft.Wedidand44reachedacottagebesideafield.Iknockedonthedoorandexplainedmysituationtoanoldman.Helaughedandthendroveushome. SinceouradventureI45thatBeansprobablyknewallalonghowtogethome. Hewasjusthavingtoomuchfanexploringnewtrails. 41
Opinionpollsarenowbeginningtoshowthatwhoeveristoblameandwhateverhappensfromnowonhighunemploymentisprobablyheretostay.Thismeansweshallhavetofindwaysofsharingtheavailableemploymentmorewidely.Butweneedtogofurther.Wemustasksomefundamentalquestionsaboutthefuturework.ShouldwecontinuetotreatemploymentasthenormShouldwenotratherencouragemanywaysforself-respectingpeopletoworkShouldwenotcreateconditionsinwhichmanyofuscanworkforourselvesratherthanforanemployerShouldwenotaimtorevivethehouseholdandtheneighborhoodaswellasthefactoryandtheofficeascentersofproductionandworkTheindustrialagehasbeentheonlyperiodofhumanhistoryinwhichmostpeople’sworkhastakentheformofjobs.Theindustrialagemaynowbecomingtoanendandsomeofthechangesinworkpatternswhichitbroughtmayhavetobereversed.Thisseemsadauntingthought.Butinfactitcouldoffertheprospectofabetterfutureforwork.Universalemploymentasitshistoryshowshasnotmeanteconomicfreedom.Employmentbecamewidespreadwhentheenclosuresofthe17thand18thcenturiesmademanypeopledependentonpaidworkbydeprivingthemoftheuseofthelandandthusofthemeanstoprovidealivingforthemselves.Thenthefactorysystemdestroyedthecottageindustriesandremovedworkfrompeople’shomes.Laterastransportimprovedfirstbyrailandthenbyroadpeoplecommutedlongerdistancestotheirplacesofemploymentuntileventuallymanypeople’sworklostallconnectionwiththeirhomelivesandtheplacesinwhichtheylive.Meanwhileemploymentputwomenatadisadvantage.Inpreindustrialtimesmenandwomenhadsharedtheproductiveworkofthehouseholdandvillagecommunity.Nowitbecamecustomaryforthehusbandtogoouttopaidemploymentleavingtheunpaidworkofthehomeandfamiliestohiswife.Taxandbenefitregulationsstillassumethisnormtodayandrestrictmoreflexiblesharingofworkrolesbetweenthesexes.Itwasnotonlywomenwhoseworkstatussuffered.Asemploymentbecamethedominantformofworkyoungpeopleandoldpeoplewereexcluded—aproblemnowasmoreteenagersbecomefrustratedatschoolandmoreretiredpeoplewanttoliveactivelives.Allthismaynowhavetochange.Thetimehascertainlycometoswitchsomeeffortandresourcesawayfromtheidealistgoalcrea-tingjobsforalltotheurgentpracticaltaskofhelpingmanypeopletomanagewithoutfull-timejobs.Itcanbeinferredfromthepassagethat______.
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假设美国某中学的学生明天来你校访问交流主题是高中生对文理科的选择你用英语写一篇发言稿向他们介绍你所做的选择并说明选择的理由注意①词数120左右②短文中不能出现与本人相关的信息参考词汇文科arts理科science
Behindourhouseisthestartofafascinatingtrail小径.Thistrailisoneoftheoldroadsthatwindthroughuntoldmilesofforest.My36BeansandIwalkthetrailfrequently.NormallyBeanssniffsalongsidethetrailtofollowthesmellofadeertrackorexploresomecauseknownonlytohim. Beansisawhitedogquitehandsomeandverysmart.Henotonlyunderstandswhatwetellhimbutalsooftenmakessoundsasifheweretryingto37back. Onemorningwetookadifferentroutewhichledustoanunfamiliartrail.Iwassurethistrailwouldeventuallyleadustoourfamiliar38.Butno.Weseemedtobefaroffcourse.AftertwohoursIsuddenlyrealizedthatBeansprobably39thewayhome.SoIurged"Beanstakemehome."Herandownanewtrail.Butitmerelyledtoanintersection岔道口oftrails. Soonitbecame40thatweweregettingnowhere.Ibegantopicturetherestofthedayinthe41withoutfoodordrink.Wehadwalkedabouttenmiles.ButBeansseemedtotally42Thesniffingandexploringwasgoingwellforhim. Finallywe43acrossroadnearahighway.LadyLucksuggestedIshouldturnleft.Wedidand44reachedacottagebesideafield.Iknockedonthedoorandexplainedmysituationtoanoldman.Helaughedandthendroveushome. SinceouradventureI45thatBeansprobablyknewallalonghowtogethome. Hewasjusthavingtoomuchfanexploringnewtrails. 45
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Directions:TranslatethefollowingsentencesintoEnglish.希望您在这儿过得愉快
WhenIlivedinSpainsomeSpanishfriendsofminedecidedtovisitEnglandbycar.Beforetheylefttheyaskedmeforadviceabouthowtofindaccommodation.IsuggestedthattheyshouldstayatbedandbreakfasthousesbecausethiskindofaccommodationgivesaforeignvisitoragoodchancetospeakEnglishwiththefamily.Myfriendslistenedtomyadvicebuttheycamebackwithsomefunnystories.Wedidn’tstayatbedandbreakfasthousestheysaidbecausewefoundthatmostfamilieswereawayonholiday.Ithoughtthiswasstrange.FinallyIunderstoodwhathadhappened.MyfriendsspokelittleEnglishandtheythoughtVACANCIESmeantholidaysbecausetheSpanishwordforholidayisvacation.SotheydidnotgotohousewherethesignoutsidesaidVACANCIESwhichinEnglishmeanstherearefreerooms.ThenmyfriendswenttohousewherethesignsaidNOVACANCIESbecausetheythoughtthismeantthepeoplewhoownedthehousewerenotawayonholiday.Buttheyfoundthatthesehouseswereallfull.Asaresulttheystayedathotels!Welaughedaboutthisandaboutmistakesmyfriendsmadeinreadingothersigns.InSpanishthewordDIVERSIONmeansfun.InEnglishitmeansthatworkmenarerepairingtheroadandthatyoumusttakeadifferentroad.WhenmyfriendssawthewordDIVERSIONonaroadsigntheythoughttheyweregoingtohavefun.Insteadtheroadisblockedbyacrowd.Englishpeoplehaveproblemstoowhentheylearnforeignlanguages.OnceinPariswhensomeoneofferedmesomemorecoffeeIsaidThankyouinFrench.ImeantthatIwouldlikesomemore.Howevertomysurprisethecoffeepotwastakenaway!LaterIfoundoutthatThankyouinFrenchmeansNothankyou.WhensomeoneofferedmemorecoffeeandIsaidThankyouinFrenchI______.
Behindourhouseisthestartofafascinatingtrail小径.Thistrailisoneoftheoldroadsthatwindthroughuntoldmilesofforest.My36BeansandIwalkthetrailfrequently.NormallyBeanssniffsalongsidethetrailtofollowthesmellofadeertrackorexploresomecauseknownonlytohim. Beansisawhitedogquitehandsomeandverysmart.Henotonlyunderstandswhatwetellhimbutalsooftenmakessoundsasifheweretryingto37back. Onemorningwetookadifferentroutewhichledustoanunfamiliartrail.Iwassurethistrailwouldeventuallyleadustoourfamiliar38.Butno.Weseemedtobefaroffcourse.AftertwohoursIsuddenlyrealizedthatBeansprobably39thewayhome.SoIurged"Beanstakemehome."Herandownanewtrail.Butitmerelyledtoanintersection岔道口oftrails. Soonitbecame40thatweweregettingnowhere.Ibegantopicturetherestofthedayinthe41withoutfoodordrink.Wehadwalkedabouttenmiles.ButBeansseemedtotally42Thesniffingandexploringwasgoingwellforhim. Finallywe43acrossroadnearahighway.LadyLucksuggestedIshouldturnleft.Wedidand44reachedacottagebesideafield.Iknockedonthedoorandexplainedmysituationtoanoldman.Helaughedandthendroveushome. SinceouradventureI45thatBeansprobablyknewallalonghowtogethome. Hewasjusthavingtoomuchfanexploringnewtrails. 39
WhenIlivedinSpainsomeSpanishfriendsofminedecidedtovisitEnglandbycar.Beforetheylefttheyaskedmeforadviceabouthowtofindaccommodation.IsuggestedthattheyshouldstayatbedandbreakfasthousesbecausethiskindofaccommodationgivesaforeignvisitoragoodchancetospeakEnglishwiththefamily.Myfriendslistenedtomyadvicebuttheycamebackwithsomefunnystories.Wedidn’tstayatbedandbreakfasthousestheysaidbecausewefoundthatmostfamilieswereawayonholiday.Ithoughtthiswasstrange.FinallyIunderstoodwhathadhappened.MyfriendsspokelittleEnglishandtheythoughtVACANCIESmeantholidaysbecausetheSpanishwordforholidayisvacation.SotheydidnotgotohousewherethesignoutsidesaidVACANCIESwhichinEnglishmeanstherearefreerooms.ThenmyfriendswenttohousewherethesignsaidNOVACANCIESbecausetheythoughtthismeantthepeoplewhoownedthehousewerenotawayonholiday.Buttheyfoundthatthesehouseswereallfull.Asaresulttheystayedathotels!Welaughedaboutthisandaboutmistakesmyfriendsmadeinreadingothersigns.InSpanishthewordDIVERSIONmeansfun.InEnglishitmeansthatworkmenarerepairingtheroadandthatyoumusttakeadifferentroad.WhenmyfriendssawthewordDIVERSIONonaroadsigntheythoughttheyweregoingtohavefun.Insteadtheroadisblockedbyacrowd.Englishpeoplehaveproblemstoowhentheylearnforeignlanguages.OnceinPariswhensomeoneofferedmesomemorecoffeeIsaidThankyouinFrench.ImeantthatIwouldlikesomemore.Howevertomysurprisethecoffeepotwastakenaway!LaterIfoundoutthatThankyouinFrenchmeansNothankyou.NOVACANCIESinEnglishmeans______.
若函数fx=x2·lna-2x+2在区间12内有且只有一个零点那么实数a的取值范围是
Directions:TranslatethefollowingpassageintoChinese.Tomakeyourfirstencounterapositiveonestartwithafirmhandshake.Iftheinterviewerdoesn’tinitiatethegestureofferyourhandfirst.Wheneveryou.haveachoiceofseatsselectachairbesidehisorherdeskasopposedtooneacrossfromit.Thatwaytherearenobarriersbetweenthetwoofyouandtheeffectissomewhatlessconfrontational.Ifyoumustsitfacingthedeskshiftyourchairslightlyasyousitdownorangleyourbodyinthechairsoyou’renotdirectlyinfrontofyourinterviewer.
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WhereisloveHowcanwefindloveThepastagesofmanhaveallbeencarefullylabeledbyanthropologists.DescriptionslikePaleolithicManNeolithicManetc.neatlysumupthewholeperiods.WhenthetimecomesforanthropologiststoturntheirattentiontothetwentiethcenturytheywillsurelychoosethelabelLeglessMan.Historiesofthetimewillgosomethinglikethis:inthetwentiethcenturypeopleforgothowtousetheirlegs.Menandwomenmovedaboutincarsbusesandtrainsfromaveryearlyage.Therewereliftsandescalatorsinalllargebuildingstopreventpeoplefromwalking.Thissituationwasforceduponearthdwellersofthattimebecauseofmileseachday.Butthesurprisingthingisthattheydidn’tusetheirlegsevenwhentheywentonholiday.Theybuiltcablerailwaysskiliftsandroadstothetopofeveryhugemountain.Allthebeautyspotsonearthweremarredbythepresenceoflargecarparks.Thefuturehistorybooksmightalsorecordthatweweredeprivedoftheuseofoureyes.Inourhurrytogetfromoneplacetoanotherwefailedtoseeanythingontheway.Airtravelgivesyouabird’seyeviewoftheworld—orevenlessifthewingoftheaircrafthappenstogetinyourway.Whenyoutravelbycarortrainablurredimageofthecountrysideconstantlysmearsthewindows.Cardriversinparticularareforeverobsessedwiththeurgetogoonandon:theyneverwanttostop.IsitthelureofthegreatmotorwaysorwhatAndasforseatravelithardlydeservesmention.Itisperfectlysummedupinthewordsoftheoldsong:IjoinedthenavytoseetheworldandwhatdidIseeIsawthesea.ThetypicaltwentiethcenturytraveleristhemanwhoalwayssaysI’vebeenthere.YoumentiontheremotestmostevocativeplacenamesintheworldlikeE1DoradoKabulIrkutskandsomeoneisboundtosayI’vebeenthere—meaningIdrovethroughitat100milesanhouronthewaytosomewhereelse.Whenyoutravelathighspeedthepresentmeansnothing:youlivemainlyinthefuturebecauseyouspendmostofyourtimelookingforwardtoarrivingatsomeotherplace.Butactualarrivalwhenitisachievedismeaningless.Youwanttomoveonagain.Bytravelinglikethisyoususpendallexperience;thepresentceasestobeareality:youmightjustaswellbedead.Thetraveleronfootontheotherhandlivesconstantlyinthepresent.Forhimtravelingandarrivingareoneandthesamething:hearrivessomewherewitheverystephemakes.Heexperiencesthepresentmomentwithhiseyeshisearsandthewholeofhisbody.Attheendofhisjourneyhefeelsadeliciousphysicalweariness.Heknowsthatsound.Satisfyingsleepwillbehis:thejustrewardofalltruetravelers.Whatisthepurposeoftheauthorinwritingthispassage
如图点P1P2…P10分别是四面体顶点或棱的中点那么在同一平面上的四点组P1PiPjPk1<i<j<k≤10有个.
WhereisloveHowcanwefindloveThepastagesofmanhaveallbeencarefullylabeledbyanthropologists.DescriptionslikePaleolithicManNeolithicManetc.neatlysumupthewholeperiods.WhenthetimecomesforanthropologiststoturntheirattentiontothetwentiethcenturytheywillsurelychoosethelabelLeglessMan.Historiesofthetimewillgosomethinglikethis:inthetwentiethcenturypeopleforgothowtousetheirlegs.Menandwomenmovedaboutincarsbusesandtrainsfromaveryearlyage.Therewereliftsandescalatorsinalllargebuildingstopreventpeoplefromwalking.Thissituationwasforceduponearthdwellersofthattimebecauseofmileseachday.Butthesurprisingthingisthattheydidn’tusetheirlegsevenwhentheywentonholiday.Theybuiltcablerailwaysskiliftsandroadstothetopofeveryhugemountain.Allthebeautyspotsonearthweremarredbythepresenceoflargecarparks.Thefuturehistorybooksmightalsorecordthatweweredeprivedoftheuseofoureyes.Inourhurrytogetfromoneplacetoanotherwefailedtoseeanythingontheway.Airtravelgivesyouabird’seyeviewoftheworld—orevenlessifthewingoftheaircrafthappenstogetinyourway.Whenyoutravelbycarortrainablurredimageofthecountrysideconstantlysmearsthewindows.Cardriversinparticularareforeverobsessedwiththeurgetogoonandon:theyneverwanttostop.IsitthelureofthegreatmotorwaysorwhatAndasforseatravelithardlydeservesmention.Itisperfectlysummedupinthewordsoftheoldsong:IjoinedthenavytoseetheworldandwhatdidIseeIsawthesea.ThetypicaltwentiethcenturytraveleristhemanwhoalwayssaysI’vebeenthere.YoumentiontheremotestmostevocativeplacenamesintheworldlikeE1DoradoKabulIrkutskandsomeoneisboundtosayI’vebeenthere—meaningIdrovethroughitat100milesanhouronthewaytosomewhereelse.Whenyoutravelathighspeedthepresentmeansnothing:youlivemainlyinthefuturebecauseyouspendmostofyourtimelookingforwardtoarrivingatsomeotherplace.Butactualarrivalwhenitisachievedismeaningless.Youwanttomoveonagain.Bytravelinglikethisyoususpendallexperience;thepresentceasestobeareality:youmightjustaswellbedead.Thetraveleronfootontheotherhandlivesconstantlyinthepresent.Forhimtravelingandarrivingareoneandthesamething:hearrivessomewherewitheverystephemakes.Heexperiencesthepresentmomentwithhiseyeshisearsandthewholeofhisbody.Attheendofhisjourneyhefeelsadeliciousphysicalweariness.Heknowsthatsound.Satisfyingsleepwillbehis:thejustrewardofalltruetravelers.Travellingathighspeedmeans______.
在1000个数据中用适当的方法抽取50个作为样本进行统计频数分布表中54.5~57.5这一组的频率是0.12那么估计总体数据落在54.5~57.5之间的约有
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