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TheInternethasbecomepartofyoungpeople’slifE.____61
阅读下面材料在空白处填入适当的内容不多于3个单词或括号内单词的正确形式TheInternet____
短文填空ThecomputerandtheInternethavebecomepartofteens
Internetdatashowsthatyoungeradultshavebecomethemai
TheInternethasbecomepartofyoungpeopie'slief.46repo
阅读短文根据所给首字母提示用合适的单词填空ThecomputerandtheInternethave
TheInternethasbecomepartofyoungpeople’slifE.64repo
Theinternethasbecomepartofyoungpeople’slifE.___41_
TheInternet______41___becomepartofyoungpeople’slif
Theinternethasbecomepartofyoungpeople‘life___37___
Theinternethasbecomepartofyoungpeople’slifE.____26
SECTIONC.Directions:Completethefollowingpassagebyf
____81____Internethasbecomepartofyoungpeople’slifE
第二节语法填空共5小题;每小题1分满分5分阅读下面短文按照句子结构的语法性和上下文连贯的要求在空格处
TheInternetasitissetupnowoperatesatthreelevels.The
The storage of data and content for use by customers.
The transmission of data and content for use by customers.
The receiving of data and content from various websites.
The programming complicated softwar
缺词填空ThecomputerandtheInternethavebecomepartofteens
TheInternethasbecomepartofyoungpeople’slifE._1.___
阅读下面短文按照句子结构的语法性和上下文连贯的要求在空格处填一个适当的词或使用括号中词语的正确形式填
WhiletheInternetisinherentlyinsecurebusinessesstil
channels
Web browser
Internet data
Internet architecture
TheInternet_____________becomepartofyoungpeople’sl
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Themajorityofpeopleaboutnineoutoftenareright-handed.1untilrecentlypeoplewhowereleft-handedwereconsidered2andoncechildrenshowedthistendencytheywereforcedtousetheirrighthands.Todayleft-handednessisgenerally3butitisstilladisadvantageinaworld4mostpeopleareright-handed.Forexamplemosttoolsandimplementsarestill5forright-handedpeople. Insports6contrastdoingthingswiththelefthandorfootisoftenanadvantage.Throwingkickingpunchingorbattingfromthe"7"sidemayresultinthrowing8manyopponentswhoaremoreaccustomedtodealingwiththe9ofplayerswhoareright-handed.Thisiswhyinmany10ataprofessionallevela11proportionofplayersareleft-handedthaninthepopulationasawhole. Theword"right"inmanylanguagesmeans"correct"oris12withlaw-fulnesswhereasthewordsassociated13"left"suchas"sinister"generallyhave14associations.Moreoveramonganumberofprimitivepeoplesthereis15closeassociationbetweendeathandthelefthand. Inthepastin16Westernsocietieschildrenwereoftenforcedtousetheirrighthandsespeciallytowritewith.Insomecasesthelefthandwas17behindthechild’sbacksothatitcouldnotbeused.Ifinthefuturetheyareallowedtochoose18willcertainlybemoreleft-handersandprobably19peoplewithminorpsychologicaldisturbancesasaresultofbeingforcedtousetheir20hand. 3
Themajorityofpeopleaboutnineoutoftenareright-handed.1untilrecentlypeoplewhowereleft-handedwereconsidered2andoncechildrenshowedthistendencytheywereforcedtousetheirrighthands.Todayleft-handednessisgenerally3butitisstilladisadvantageinaworld4mostpeopleareright-handed.Forexamplemosttoolsandimplementsarestill5forright-handedpeople. Insports6contrastdoingthingswiththelefthandorfootisoftenanadvantage.Throwingkickingpunchingorbattingfromthe"7"sidemayresultinthrowing8manyopponentswhoaremoreaccustomedtodealingwiththe9ofplayerswhoareright-handed.Thisiswhyinmany10ataprofessionallevela11proportionofplayersareleft-handedthaninthepopulationasawhole. Theword"right"inmanylanguagesmeans"correct"oris12withlaw-fulnesswhereasthewordsassociated13"left"suchas"sinister"generallyhave14associations.Moreoveramonganumberofprimitivepeoplesthereis15closeassociationbetweendeathandthelefthand. Inthepastin16Westernsocietieschildrenwereoftenforcedtousetheirrighthandsespeciallytowritewith.Insomecasesthelefthandwas17behindthechild’sbacksothatitcouldnotbeused.Ifinthefuturetheyareallowedtochoose18willcertainlybemoreleft-handersandprobably19peoplewithminorpsychologicaldisturbancesasaresultofbeingforcedtousetheir20hand. 5
求级数的收敛域及和函数
WhatreallyworkstomakesustainablechangesindietandlifestyleIt’sprobablynotwhatyouthink.Yearsofclinicalresearchprovesthattherealkeysarepleasurejoyandfreedomnotourpowerofwillorausterity苦行.Joyoflivingissustainable;fearofdyingisnot.WhyBecauselifeistobeenjoyed.There’snopointingivingupsomethingyouenjoyunlessyougetsomethingbackthat’sevenbetterandquickly.Whenpeopleeatmorehealthfullyexercisequitsmokingmanagestressbetterandlovemoretheyfindthattheyfeelsomuchbettersoquicklyitreconstructthereasonformakingthesechangesfromfearofdyingtojoyofliving.Fortunatelythelateststudiesshowhowdynamicandpowerfularethemechanismsthatcontrolourhealthandwell-being.Whenyouexerciseandeatright:Yourbrainreceivesmorebloodflowandoxygensoyoubecomesmarterthinkmoreclearlyhavemoreenergyandneedlesssleep.Twostudiesshowedthatjustwalkingforthreehoursperweekforonlythreemonthscausedsomanynewnervecellstogrowthatitactuallyincreasedthesizeofpeople’sbrains!Yourfacereceivesmorebloodflowsoyourskinglowsmoreandwrinklesless.Youlookyoungerandmoreattractive.Incontrastanunhealthydietlastingemotionalstressandsmokingreducebloodflowtoyourfacesoyouagemorequickly.Smokingaccelerateagingbecausenicotine尼古丁causesyourbloodvesseltobecomenarrowerwhichdecreasesbloodflowtoyourfaceandmakesitwrinkleprematurely.Thisiswhysmokerslookyearsolderthantheyreallyare.Oneofthemostinterestingfindingsinthisstudywasthatthemothers’perceptionsofstressweremoreimportantthanwhatwasobjectivelyoccurringintheirlives.Theresearchersmadeasurveyamongwomenandaskedthemtorateonathree-pointscalehowstressedtheyfelteachdayandhowoutofcontroltheirlivesfelttothem.Thewomenwhoperceivedthattheywereunderheavystresshadsignificantlyshortenedanddamagedtelomeres染色体端粒comparedwiththosewhofeltmorerelaxed.Converselysomeofthewomenwhofeltrelaxeddespiteraisingadisabledchildhadmorenormal-appearingtelomeres.Inotherwordsifyoufeelstressedyouarestressed.Accordingtothepassagewhat’sthebenefitofexercisingandeatingright
设fxy连续且①其中D=xy|0≤x≤10≤y≤1．求．
Themajorityofpeopleaboutnineoutoftenareright-handed.1untilrecentlypeoplewhowereleft-handedwereconsidered2andoncechildrenshowedthistendencytheywereforcedtousetheirrighthands.Todayleft-handednessisgenerally3butitisstilladisadvantageinaworld4mostpeopleareright-handed.Forexamplemosttoolsandimplementsarestill5forright-handedpeople. Insports6contrastdoingthingswiththelefthandorfootisoftenanadvantage.Throwingkickingpunchingorbattingfromthe"7"sidemayresultinthrowing8manyopponentswhoaremoreaccustomedtodealingwiththe9ofplayerswhoareright-handed.Thisiswhyinmany10ataprofessionallevela11proportionofplayersareleft-handedthaninthepopulationasawhole. Theword"right"inmanylanguagesmeans"correct"oris12withlaw-fulnesswhereasthewordsassociated13"left"suchas"sinister"generallyhave14associations.Moreoveramonganumberofprimitivepeoplesthereis15closeassociationbetweendeathandthelefthand. Inthepastin16Westernsocietieschildrenwereoftenforcedtousetheirrighthandsespeciallytowritewith.Insomecasesthelefthandwas17behindthechild’sbacksothatitcouldnotbeused.Ifinthefuturetheyareallowedtochoose18willcertainlybemoreleft-handersandprobably19peoplewithminorpsychologicaldisturbancesasaresultofbeingforcedtousetheir20hand. 7
Themajorityofpeopleaboutnineoutoftenareright-handed.1untilrecentlypeoplewhowereleft-handedwereconsidered2andoncechildrenshowedthistendencytheywereforcedtousetheirrighthands.Todayleft-handednessisgenerally3butitisstilladisadvantageinaworld4mostpeopleareright-handed.Forexamplemosttoolsandimplementsarestill5forright-handedpeople. Insports6contrastdoingthingswiththelefthandorfootisoftenanadvantage.Throwingkickingpunchingorbattingfromthe"7"sidemayresultinthrowing8manyopponentswhoaremoreaccustomedtodealingwiththe9ofplayerswhoareright-handed.Thisiswhyinmany10ataprofessionallevela11proportionofplayersareleft-handedthaninthepopulationasawhole. Theword"right"inmanylanguagesmeans"correct"oris12withlaw-fulnesswhereasthewordsassociated13"left"suchas"sinister"generallyhave14associations.Moreoveramonganumberofprimitivepeoplesthereis15closeassociationbetweendeathandthelefthand. Inthepastin16Westernsocietieschildrenwereoftenforcedtousetheirrighthandsespeciallytowritewith.Insomecasesthelefthandwas17behindthechild’sbacksothatitcouldnotbeused.Ifinthefuturetheyareallowedtochoose18willcertainlybemoreleft-handersandprobably19peoplewithminorpsychologicaldisturbancesasaresultofbeingforcedtousetheir20hand. 19
证明并说明此结果的概率含义．
=______．
设A是n阶方阵且E+A可逆证明若A为反对称矩阵则E-AE+A-1是正交矩阵．
设二次型满足=2AB=O其中．用正交变换化二次型为标准形并求所作的正交变换
设fxgx在点x=0的某邻域内连续且fx具有一阶连续导数满足则______．
求微分方程y-3y’-4y=10x-7e-x+34sinx的通解．
Themajorityofpeopleaboutnineoutoftenareright-handed.1untilrecentlypeoplewhowereleft-handedwereconsidered2andoncechildrenshowedthistendencytheywereforcedtousetheirrighthands.Todayleft-handednessisgenerally3butitisstilladisadvantageinaworld4mostpeopleareright-handed.Forexamplemosttoolsandimplementsarestill5forright-handedpeople. Insports6contrastdoingthingswiththelefthandorfootisoftenanadvantage.Throwingkickingpunchingorbattingfromthe"7"sidemayresultinthrowing8manyopponentswhoaremoreaccustomedtodealingwiththe9ofplayerswhoareright-handed.Thisiswhyinmany10ataprofessionallevela11proportionofplayersareleft-handedthaninthepopulationasawhole. Theword"right"inmanylanguagesmeans"correct"oris12withlaw-fulnesswhereasthewordsassociated13"left"suchas"sinister"generallyhave14associations.Moreoveramonganumberofprimitivepeoplesthereis15closeassociationbetweendeathandthelefthand. Inthepastin16Westernsocietieschildrenwereoftenforcedtousetheirrighthandsespeciallytowritewith.Insomecasesthelefthandwas17behindthechild’sbacksothatitcouldnotbeused.Ifinthefuturetheyareallowedtochoose18willcertainlybemoreleft-handersandprobably19peoplewithminorpsychologicaldisturbancesasaresultofbeingforcedtousetheir20hand. 9
Themajorityofpeopleaboutnineoutoftenareright-handed.1untilrecentlypeoplewhowereleft-handedwereconsidered2andoncechildrenshowedthistendencytheywereforcedtousetheirrighthands.Todayleft-handednessisgenerally3butitisstilladisadvantageinaworld4mostpeopleareright-handed.Forexamplemosttoolsandimplementsarestill5forright-handedpeople. Insports6contrastdoingthingswiththelefthandorfootisoftenanadvantage.Throwingkickingpunchingorbattingfromthe"7"sidemayresultinthrowing8manyopponentswhoaremoreaccustomedtodealingwiththe9ofplayerswhoareright-handed.Thisiswhyinmany10ataprofessionallevela11proportionofplayersareleft-handedthaninthepopulationasawhole. Theword"right"inmanylanguagesmeans"correct"oris12withlaw-fulnesswhereasthewordsassociated13"left"suchas"sinister"generallyhave14associations.Moreoveramonganumberofprimitivepeoplesthereis15closeassociationbetweendeathandthelefthand. Inthepastin16Westernsocietieschildrenwereoftenforcedtousetheirrighthandsespeciallytowritewith.Insomecasesthelefthandwas17behindthechild’sbacksothatitcouldnotbeused.Ifinthefuturetheyareallowedtochoose18willcertainlybemoreleft-handersandprobably19peoplewithminorpsychologicaldisturbancesasaresultofbeingforcedtousetheir20hand. 17
WhatreallyworkstomakesustainablechangesindietandlifestyleIt’sprobablynotwhatyouthink.Yearsofclinicalresearchprovesthattherealkeysarepleasurejoyandfreedomnotourpowerofwillorausterity苦行.Joyoflivingissustainable;fearofdyingisnot.WhyBecauselifeistobeenjoyed.There’snopointingivingupsomethingyouenjoyunlessyougetsomethingbackthat’sevenbetterandquickly.Whenpeopleeatmorehealthfullyexercisequitsmokingmanagestressbetterandlovemoretheyfindthattheyfeelsomuchbettersoquicklyitreconstructthereasonformakingthesechangesfromfearofdyingtojoyofliving.Fortunatelythelateststudiesshowhowdynamicandpowerfularethemechanismsthatcontrolourhealthandwell-being.Whenyouexerciseandeatright:Yourbrainreceivesmorebloodflowandoxygensoyoubecomesmarterthinkmoreclearlyhavemoreenergyandneedlesssleep.Twostudiesshowedthatjustwalkingforthreehoursperweekforonlythreemonthscausedsomanynewnervecellstogrowthatitactuallyincreasedthesizeofpeople’sbrains!Yourfacereceivesmorebloodflowsoyourskinglowsmoreandwrinklesless.Youlookyoungerandmoreattractive.Incontrastanunhealthydietlastingemotionalstressandsmokingreducebloodflowtoyourfacesoyouagemorequickly.Smokingaccelerateagingbecausenicotine尼古丁causesyourbloodvesseltobecomenarrowerwhichdecreasesbloodflowtoyourfaceandmakesitwrinkleprematurely.Thisiswhysmokerslookyearsolderthantheyreallyare.Oneofthemostinterestingfindingsinthisstudywasthatthemothers’perceptionsofstressweremoreimportantthanwhatwasobjectivelyoccurringintheirlives.Theresearchersmadeasurveyamongwomenandaskedthemtorateonathree-pointscalehowstressedtheyfelteachdayandhowoutofcontroltheirlivesfelttothem.Thewomenwhoperceivedthattheywereunderheavystresshadsignificantlyshortenedanddamagedtelomeres染色体端粒comparedwiththosewhofeltmorerelaxed.Converselysomeofthewomenwhofeltrelaxeddespiteraisingadisabledchildhadmorenormal-appearingtelomeres.Inotherwordsifyoufeelstressedyouarestressed.Whatcanwelearnaboutthestudycarriedoutonmothers
设四阶行列式则第3列各元素的代数余子式之和A13+A23+A33+A34=______．
Themajorityofpeopleaboutnineoutoftenareright-handed.1untilrecentlypeoplewhowereleft-handedwereconsidered2andoncechildrenshowedthistendencytheywereforcedtousetheirrighthands.Todayleft-handednessisgenerally3butitisstilladisadvantageinaworld4mostpeopleareright-handed.Forexamplemosttoolsandimplementsarestill5forright-handedpeople. Insports6contrastdoingthingswiththelefthandorfootisoftenanadvantage.Throwingkickingpunchingorbattingfromthe"7"sidemayresultinthrowing8manyopponentswhoaremoreaccustomedtodealingwiththe9ofplayerswhoareright-handed.Thisiswhyinmany10ataprofessionallevela11proportionofplayersareleft-handedthaninthepopulationasawhole. Theword"right"inmanylanguagesmeans"correct"oris12withlaw-fulnesswhereasthewordsassociated13"left"suchas"sinister"generallyhave14associations.Moreoveramonganumberofprimitivepeoplesthereis15closeassociationbetweendeathandthelefthand. Inthepastin16Westernsocietieschildrenwereoftenforcedtousetheirrighthandsespeciallytowritewith.Insomecasesthelefthandwas17behindthechild’sbacksothatitcouldnotbeused.Ifinthefuturetheyareallowedtochoose18willcertainlybemoreleft-handersandprobably19peoplewithminorpsychologicaldisturbancesasaresultofbeingforcedtousetheir20hand. 13
TheScottishcountrysidewillsoonbehometocreatureswhichisstrangetoBritain.Thisspring17beavers海狸willbereleasedintoaremoteareaofriversandforests.HuntedtoextinctionthroughoutEuropebeavershaven’troamedBritain’swildernessforalmost500years.Ecologistswouldliketoinvitebackotherlong-lostspeciestohelprestorethenaturalbalance.Tosavethecountry’splantsfromdeerwhichhavedoubledto2millionsincethestartofthisdecadeanOxfordUniversitybiologistlatelastyearcalledforreintroducingthelynx猞猁—awildcatthatdiedoutinBritain1300yearsago.NaturehaslongbeenapopularcauseinEurope.BritishpeoplelovetheircountrysideoffencesandfieldstheFrenchtheirvineyards葡萄园andtheGermanstheirhikingforests.ButinrecentyearsconservationistshavesettheirsightsonthemoredistantpastwhenEurope’sforestsandmeadowswerefullofelephantshippo-potamuses河马rhinoceroses犀牛andbigcats.Someambitiousconservationistsarenowadvocatingareturntonormsofwildernessthatdatebackto11000yearsagowhenthebiggestmammalswereatthetopofthefoodchain.Nobodyisadvocatingallowingelephantsandlionstoruncrazilyinthisdenselypopulatedregion.Butwildingsupporterswouldgivefreecontroltoalonglistoflessermammalsincludingthebeaverandthelynxwhichsomepeoplefearcouldbedestructive.Somelandownerswithdrawatthethoughtofbeaverscuttingdowntreeswiththeirteethandfloodingtheirproperty;theScottishParliamentrejectedseveralearliereffortstoreintroducethemammal.ProposalstosetloosewolvesandbearsinBritainhavealsoencounteredresistance.AlthoughrhinosandhipposthrivedinEuropethousandsofyearsagonooneissurewhateffecttheywouldhaveonecosystemsnow.Theideaofbringingbackbigmammalsisinterestingbutwhenyougetdowntothenutsandboltsthere’salotofquestionssaysomebiologists.ForexampleelephantscoulddestroywhatlittleforestandgrasslandEuropehasleft.ThebeaversofTierradelFuegoprovideacautionarytale.Whenafailedcommercialfurfarmreleaseditsfewremainingbeaversintothewild60yearsagothepopulationexplodedandtheyarestillrevengingthelocalpeople.IsthisBritain’sfutureSupporterssaynothebeaverwillfitrightin.Destroyingnatureisnotajobforthemild.WhatcanwelearnfromPara.3
设AB均为四阶方阵rA＝3rB＝4其伴随矩阵分别为A*B*则rA*B*=______．
TheScottishcountrysidewillsoonbehometocreatureswhichisstrangetoBritain.Thisspring17beavers海狸willbereleasedintoaremoteareaofriversandforests.HuntedtoextinctionthroughoutEuropebeavershaven’troamedBritain’swildernessforalmost500years.Ecologistswouldliketoinvitebackotherlong-lostspeciestohelprestorethenaturalbalance.Tosavethecountry’splantsfromdeerwhichhavedoubledto2millionsincethestartofthisdecadeanOxfordUniversitybiologistlatelastyearcalledforreintroducingthelynx猞猁—awildcatthatdiedoutinBritain1300yearsago.NaturehaslongbeenapopularcauseinEurope.BritishpeoplelovetheircountrysideoffencesandfieldstheFrenchtheirvineyards葡萄园andtheGermanstheirhikingforests.ButinrecentyearsconservationistshavesettheirsightsonthemoredistantpastwhenEurope’sforestsandmeadowswerefullofelephantshippo-potamuses河马rhinoceroses犀牛andbigcats.Someambitiousconservationistsarenowadvocatingareturntonormsofwildernessthatdatebackto11000yearsagowhenthebiggestmammalswereatthetopofthefoodchain.Nobodyisadvocatingallowingelephantsandlionstoruncrazilyinthisdenselypopulatedregion.Butwildingsupporterswouldgivefreecontroltoalonglistoflessermammalsincludingthebeaverandthelynxwhichsomepeoplefearcouldbedestructive.Somelandownerswithdrawatthethoughtofbeaverscuttingdowntreeswiththeirteethandfloodingtheirproperty;theScottishParliamentrejectedseveralearliereffortstoreintroducethemammal.ProposalstosetloosewolvesandbearsinBritainhavealsoencounteredresistance.AlthoughrhinosandhipposthrivedinEuropethousandsofyearsagonooneissurewhateffecttheywouldhaveonecosystemsnow.Theideaofbringingbackbigmammalsisinterestingbutwhenyougetdowntothenutsandboltsthere’salotofquestionssaysomebiologists.ForexampleelephantscoulddestroywhatlittleforestandgrasslandEuropehasleft.ThebeaversofTierradelFuegoprovideacautionarytale.Whenafailedcommercialfurfarmreleaseditsfewremainingbeaversintothewild60yearsagothepopulationexplodedandtheyarestillrevengingthelocalpeople.IsthisBritain’sfutureSupporterssaynothebeaverwillfitrightin.Destroyingnatureisnotajobforthemild.ThewordroamedLine3Para.1mostprobablymeans______.
证明方程xe2x-2x-cosx+x2/2=0有且仅有两个根．
Themajorityofpeopleaboutnineoutoftenareright-handed.1untilrecentlypeoplewhowereleft-handedwereconsidered2andoncechildrenshowedthistendencytheywereforcedtousetheirrighthands.Todayleft-handednessisgenerally3butitisstilladisadvantageinaworld4mostpeopleareright-handed.Forexamplemosttoolsandimplementsarestill5forright-handedpeople. Insports6contrastdoingthingswiththelefthandorfootisoftenanadvantage.Throwingkickingpunchingorbattingfromthe"7"sidemayresultinthrowing8manyopponentswhoaremoreaccustomedtodealingwiththe9ofplayerswhoareright-handed.Thisiswhyinmany10ataprofessionallevela11proportionofplayersareleft-handedthaninthepopulationasawhole. Theword"right"inmanylanguagesmeans"correct"oris12withlaw-fulnesswhereasthewordsassociated13"left"suchas"sinister"generallyhave14associations.Moreoveramonganumberofprimitivepeoplesthereis15closeassociationbetweendeathandthelefthand. Inthepastin16Westernsocietieschildrenwereoftenforcedtousetheirrighthandsespeciallytowritewith.Insomecasesthelefthandwas17behindthechild’sbacksothatitcouldnotbeused.Ifinthefuturetheyareallowedtochoose18willcertainlybemoreleft-handersandprobably19peoplewithminorpsychologicaldisturbancesasaresultofbeingforcedtousetheir20hand. 15
Themajorityofpeopleaboutnineoutoftenareright-handed.1untilrecentlypeoplewhowereleft-handedwereconsidered2andoncechildrenshowedthistendencytheywereforcedtousetheirrighthands.Todayleft-handednessisgenerally3butitisstilladisadvantageinaworld4mostpeopleareright-handed.Forexamplemosttoolsandimplementsarestill5forright-handedpeople. Insports6contrastdoingthingswiththelefthandorfootisoftenanadvantage.Throwingkickingpunchingorbattingfromthe"7"sidemayresultinthrowing8manyopponentswhoaremoreaccustomedtodealingwiththe9ofplayerswhoareright-handed.Thisiswhyinmany10ataprofessionallevela11proportionofplayersareleft-handedthaninthepopulationasawhole. Theword"right"inmanylanguagesmeans"correct"oris12withlaw-fulnesswhereasthewordsassociated13"left"suchas"sinister"generallyhave14associations.Moreoveramonganumberofprimitivepeoplesthereis15closeassociationbetweendeathandthelefthand. Inthepastin16Westernsocietieschildrenwereoftenforcedtousetheirrighthandsespeciallytowritewith.Insomecasesthelefthandwas17behindthechild’sbacksothatitcouldnotbeused.Ifinthefuturetheyareallowedtochoose18willcertainlybemoreleft-handersandprobably19peoplewithminorpsychologicaldisturbancesasaresultofbeingforcedtousetheir20hand. 11
已知随机变量XY的联合密度函数为则t的二次方程t2-2Xt+Y=0有实根的概率为______．
设钢管内径X服从正态分布Nμσ2规定内径在98到102之间的为合格品超过102的为废品不是98的为次品．已知该批产品的次品率为15.9%内径超过101的产品在总产品中占2.28%求整批产品的合格率．
TheScottishcountrysidewillsoonbehometocreatureswhichisstrangetoBritain.Thisspring17beavers海狸willbereleasedintoaremoteareaofriversandforests.HuntedtoextinctionthroughoutEuropebeavershaven’troamedBritain’swildernessforalmost500years.Ecologistswouldliketoinvitebackotherlong-lostspeciestohelprestorethenaturalbalance.Tosavethecountry’splantsfromdeerwhichhavedoubledto2millionsincethestartofthisdecadeanOxfordUniversitybiologistlatelastyearcalledforreintroducingthelynx猞猁—awildcatthatdiedoutinBritain1300yearsago.NaturehaslongbeenapopularcauseinEurope.BritishpeoplelovetheircountrysideoffencesandfieldstheFrenchtheirvineyards葡萄园andtheGermanstheirhikingforests.ButinrecentyearsconservationistshavesettheirsightsonthemoredistantpastwhenEurope’sforestsandmeadowswerefullofelephantshippo-potamuses河马rhinoceroses犀牛andbigcats.Someambitiousconservationistsarenowadvocatingareturntonormsofwildernessthatdatebackto11000yearsagowhenthebiggestmammalswereatthetopofthefoodchain.Nobodyisadvocatingallowingelephantsandlionstoruncrazilyinthisdenselypopulatedregion.Butwildingsupporterswouldgivefreecontroltoalonglistoflessermammalsincludingthebeaverandthelynxwhichsomepeoplefearcouldbedestructive.Somelandownerswithdrawatthethoughtofbeaverscuttingdowntreeswiththeirteethandfloodingtheirproperty;theScottishParliamentrejectedseveralearliereffortstoreintroducethemammal.ProposalstosetloosewolvesandbearsinBritainhavealsoencounteredresistance.AlthoughrhinosandhipposthrivedinEuropethousandsofyearsagonooneissurewhateffecttheywouldhaveonecosystemsnow.Theideaofbringingbackbigmammalsisinterestingbutwhenyougetdowntothenutsandboltsthere’salotofquestionssaysomebiologists.ForexampleelephantscoulddestroywhatlittleforestandgrasslandEuropehasleft.ThebeaversofTierradelFuegoprovideacautionarytale.Whenafailedcommercialfurfarmreleaseditsfewremainingbeaversintothewild60yearsagothepopulationexplodedandtheyarestillrevengingthelocalpeople.IsthisBritain’sfutureSupporterssaynothebeaverwillfitrightin.Destroyingnatureisnotajobforthemild.Whatcanbeinferredfromthepassage
设fx是-∞+∞内的以T为周期的连续奇函数则下列函数中不是周期函数的是______．
Themajorityofpeopleaboutnineoutoftenareright-handed.1untilrecentlypeoplewhowereleft-handedwereconsidered2andoncechildrenshowedthistendencytheywereforcedtousetheirrighthands.Todayleft-handednessisgenerally3butitisstilladisadvantageinaworld4mostpeopleareright-handed.Forexamplemosttoolsandimplementsarestill5forright-handedpeople. Insports6contrastdoingthingswiththelefthandorfootisoftenanadvantage.Throwingkickingpunchingorbattingfromthe"7"sidemayresultinthrowing8manyopponentswhoaremoreaccustomedtodealingwiththe9ofplayerswhoareright-handed.Thisiswhyinmany10ataprofessionallevela11proportionofplayersareleft-handedthaninthepopulationasawhole. Theword"right"inmanylanguagesmeans"correct"oris12withlaw-fulnesswhereasthewordsassociated13"left"suchas"sinister"generallyhave14associations.Moreoveramonganumberofprimitivepeoplesthereis15closeassociationbetweendeathandthelefthand. Inthepastin16Westernsocietieschildrenwereoftenforcedtousetheirrighthandsespeciallytowritewith.Insomecasesthelefthandwas17behindthechild’sbacksothatitcouldnotbeused.Ifinthefuturetheyareallowedtochoose18willcertainlybemoreleft-handersandprobably19peoplewithminorpsychologicaldisturbancesasaresultofbeingforcedtousetheir20hand. 1
fx=sint2dt当x→0时fx是x的n阶无穷小则n=______．
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