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子弹以速度v0(米/秒)与铁板垂直方向打入厚度为10厘米的铁板，穿过后以速度v1(米/秒)离开此板．设板对子弹的阻力与速度平方成正比． (Ⅰ) 求子弹穿过板5厘米时的速度； (Ⅱ) 求子弹穿过板所...
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某种导火线的燃烧速度是0.81厘米/秒爆破员跑开的速度是5米/秒为在点火后使爆破员跑到150米以外的
22厘米
23厘米
24厘米
25厘米
轻爆的爆炸传播速度为
数十厘米/秒至数米/秒
数米/秒至数百米/每秒
数厘米/秒至数十厘米/秒
在等腰△ABC中腰长10厘米底边长16厘米点P在底边上以0.5厘米/秒的速度从点B向点C移动当点P
某种导火线的燃烧速度是0.82厘米/秒爆破员跑开的速度是5米/秒为在点火后使爆破员跑到150米以外的
22厘米
23厘米
24厘米
25厘米
某种导火线的燃烧速度是0.81厘米/秒爆破员跑开的速度是5米/秒为在点火后使爆破员跑到150米以外的
22厘米
23厘米
24厘米
25厘米
某种导火线的燃烧速度是0.82厘米/秒爆破员跑开的速度是5米/秒为在点火后使爆破员跑到150米以外
22厘米
23厘米
24厘米
25厘米
如图四边形ABCD中AD∥BC∠A.=90°AD=1厘米AB=3厘米BC=5厘米动点P.从点B.出发
某种导火线的燃烧速度是0.82厘米/秒爆破员跑开的速度是5米/秒为在点火后使爆破员跑到150米以外的
22厘米
23厘米
24厘米
25厘米
某种导火线的燃烧速度是0.81厘米/秒爆破员跑开的速度是5米/秒为在点火后使爆破员跑到150米以外的
22厘米
23厘米
24厘米
25厘米
靠泊仪可指示船首尾距码头距离和入泊速度其量程和精度分别为
0～100米（±2%）；0～20厘米/秒（±1%）
0～120米（±1%）；0～25厘米/秒（±2%）
0～150米（±1%）；0～20厘米/秒（±1%）
0～200米（±2%）；0～25厘米/秒（±1%）
如图四边形ABCD的三边ABBCCD和BD的长度都为5厘米动点P.从A.出发A.→B.→D.到D.速
人工机器平信捆把的厚度要求分别是
8厘米10厘米
10厘米8厘米
10厘米15厘米
15厘米10厘米
在测定匀速直线运动的加速度实验中得到一条纸带如图纸带上的A.B.C.D.E.F是记数点每打五次点取一
某种导火线的燃烧速度是0.81厘米／秒爆破员跑开的速度是5米／秒为在点火后使爆破员跑到150米以外的
22厘米
23厘米
24厘米
25厘米
铁扒煎灶表面是一块厚的平整铁板
2～5毫米
5~10毫米
1～2厘米
5—6厘米
一个盛有水的圆柱体容器底面半径为8厘米高30厘米水深12厘米现将一个底面半径为6厘米铁圆锥垂直放入容
如图所示平面镜与桌面成45°角放置一只甲壳虫从
处沿桌面以20厘米/秒的速度向着平面镜
处爬动，那么，平面镜中甲壳虫的虚像向甲壳虫靠拢的速度的大小是:A.28.2厘米/秒;B.20厘米/秒;
14.1厘米/秒;
10厘米/秒.
一子弹穿透某铁板已知入射子弹的速度为v0穿出铁板时的速度为v1以子弹入射铁板时为起始时间又知穿透铁板
子弹以速度v0=200米/秒与板垂直的方向打入厚度为10米的板穿过后以速度v1=80米/秒离开此板设
北冰洋洋盆内冰速较小基本上在
1~4厘米/秒
2~5厘米/秒
3~7厘米/秒
7~10厘米/秒
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[A]DrDanielStanleyanoceanographerhasfoundvolcanicshardsinEgyptthathebelievesarelinkedtotheexplosion.ComputersimulationsbyMikeRampinoaclimatemodelerfromNewYorkUniversityshowthattheresultingashcloudcouldhaveplungedtheareaintodarknessaswellasgeneratinglightningandhailtwoofthe10plagues. [B]Thecloudcouldhavealsoreducedtherainfallcausingadrought.IftheNilehadthenbeenpoisonedbytheeffectsoftheeruptionpollutioncouldhaveturneditredashappenedinarecentenvironmentaldisasterinAmerica.Thesamepollutioncouldhavedrivenmillionsoffrogsontothelandthesecondplague.Onlandthefrogswoulddieremovingtheonlyobstacletoanexplosionoffliesandlice—thethirdandfourthplagues.Thefliescouldhavetransmittedfataldiseasestocattlethefifthplagueandboilsandblisterstohumansthesixthplague. [C]MoseswhichwillbebroadcastinDecember2002willsuggestthatmuchoftheBiblestorycanheexplainedbyasinglenaturaldisasterahugevolcaniceruptionontheGreekislandofSantoriniinthe16thcenturyBC. [D]Thehour-longdocumentaryarguesthateventhestoryofthepartingoftheRedSeawhichallowedMosestoleadtheHebrewstosafetywhilethepursuingEgyptianarmywasdrownedmayhaveitsoriginsintheeruption.Itrepeatsthetheorythat"RedSea"isamistranslationoftheSeaofReedsamuchshallowerswamp. [E]TheprogrammetellsthestoryofhowMosesledtheHebrewsoutofEgyptafteraseriesofplagueshaddevastatedthecountry.Butitalsousesnewscientificresearchtoarguethatmanyoftheeventssurroundingtheexoduscouldhavebeentriggeredbytheeruptionwhichwouldhavebeenathousandtimesmorepowerfulthananuclearbomb. [F]ComputersimulationsshowthattheSantorinieruptioncouldhavetriggereda600ft-hightidalwavetravelingatabout400milesanhourwhichwouldhavebeen6fthighandahundredmileslongwhenitreachedtheEgyptiandelta.Suchaneventwouldhavebeenrememberedforgenerationsandmayhaveprovidedtheinspirationforthestory. [G]FreshevidencethattheBiblicalplaguesandthepartingoftheRedSeawerenaturaleventsratherthanmythsormiraclesistobepresentedinanewBBCdocumentary. Order: 42
Inthepastyearalothaschangedinthefieldofhumanspaceflight.46InJanuaryPresidentGeorgeBushbrushedasidethefactthatAmerica’sentirespace-shuttlefleetwasgroundedwhenheannouncedgrandioseplanstoputpeoplebackonthemoonandthentolaunchamannedmissiontoMars.47InJuneButtRutananAmericanaeronauticalengineershowedthathumanspaceflightwasnolongerthepreserveofgovernmentsbysendingamantotheedgeofspaceinSpaceShipOneaprivatelyfinancedvehiclethatcostaboutthesametobuildasaluxuryyacht.ThatwasfollowedinSeptemberbySirRichardBransontheBritishentrepreneurbehindtheVirginbrandannouncingthathehadsignedadealwithMrRutantoworkonplansforafleetoffivesuborbitalvehiclesdevelopedfromSpaceShipOne. 48NowinthedyingdaysoftheyearAmerica’sCongresshaspassedabillthatunravelsatangleaboutwhowouldberesponsibleforregulatingthefledglingindustryandunderwhatterms.49ThebillalsoallowspassengerstoflyontheunderstandingthatthisnewgenerationofvehiclesmaynotbeassafeastakingacommercialflightbetweensayNewYorkandLondon. TheofficiallinefromVirginGalacticaasSirRichard’slatestventureismodestlynamedisthatthiscomingchangeinthelawmakesnopracticaldifferencetothefirm’splanssincetheydonotintendtoflyunlesstheycanmaketheirspacecraftassafeasaprivatejet.Butitmustsurelycomeassomesortofrelief.InanycaseWillWhitehorndirectorofcorporateaffairsatVirgin’sheadquartersinLondonandsoontobecomethepresidentofVirginGalacticasaysthatworkisunderwayonamockupoftheinteriorofanewspacecraftthatwillholdfivepassengers.50Virginhasalreadycommitted$20mtowardslicensingtheSpaceShipOnetechnologyfromMr.RutanandhisfinancialbackerPaulAllenasoftwarebillionaire. 46
已知α1=135-1Tα2=27a4Tα3=517-17TⅠ若α1α2α3线性相关求a的值Ⅱ当a=3时求与α1α2α3都正交的非零向量α4Ⅲ当a=3时证明α1α2α3α4可表示任一个4维列向量．
设积分区域D=|xy|0≤x≤20≤y≤1计算二重积分．
Directions: Studythefollowingpiechartscarefullyandwriteanessayinwhichyoushould 1describethedrawingbriefly 2explainitsintendedmeaningandthen 3giveyourexamples. Youshouldwriteabout160-200wordsneatlyonANSHWERSHEET2.
In1929JohnD.Rockefellerdecideditwastimetosellshareswhenevenashoe-shineboyofferedhimasharetip.DuringthepastweekTheEconomist’seconomicseditorhasbeen-advisedbyataxidriveraplumberandahairdresserthatyoucan’tgowronginvestinginhousing—themoreyouownthebetter.IsthisasignthatitistimetogetoutAttheveryleastashousepricesaroundtheworldclimbtoeverloftierheightsandmoreandmorepeoplejumpontothebuy-to-letladderitistimetoexposesomeofthefallaciesregularlytrottedoutbysomanyself-appointedhousingexperts.Onecommonerroristhathousepricesmustcontinuetorisebecauseofalimitedsupplyofland.ForinstanceitisarguedthathousepriceswillalwaysriseinLondonbecauselotsofpeoplewanttolivehere.Butthisconfusesthelevelofpriceswiththeirrateofchange.Homepricesareboundtobehigherinbigcitiesbecauseoflandscarcitybutthisdoesnotguaranteethaturbanhousepriceswillkeeprisingindefinitely—justlookatTokyo’shugeprice-dropssince1990.Andthoughitistruethatafixedsupplyofhomesmaypushuphousepricesifthepopulationisrisingthiswouldimplyasteadyriseinpricesnotthe20%annualjumpsofrecentyears.Asecondflawedargumentisthatlowinterestratesmakebuyingahomecheaperandsopushupdemandandprices.Lowerinterestratesmayhaveallowedsomepeoplewhootherwisecouldnothaveaffordedamortgagetobuyahome.Butmanyborrowerswhothinkmortgagesarecheaperaresufferingfrommoneyillusion.Interestratesarenotverylowinrealinflation-adjustedterms.Initialinterestpaymentsmayseemlowinrelationtoincomebutbecauseinflationisalsolowitwillnoterodetherealburdenofdebtasswiftlyasitoncedid.Soinlateryearsmortgagepaymentswillbemuchlargerinrealterms.Toarguethatlownominalinterestratesmakebuyingahomecheaperislikearguingthatacarloanpaidoffoverfouryearsischeaperthanonerepaidovertwoyears.FallacynumberthreeisafavouriteclaimofAlanGreenspanchairmanofAmerica’sFederalReserve.Thisisthatpricebubblesarelesslikelyinhousingthaninthestockmarketbecausehighertransactioncostsdiscouragespeculation.Infactseveralstudieshaveshownthatbothintheoryandinpracticebubblesaremorelikelyinhousingthaninshares.AstudybytheIMFfindsthatasharpriseinhousepricesisfarmorelikelytobefollowedbyabustthanisashare-priceboom.TheviewsofAlanGreenspanandtheauthorofthetextonpricebubblesare______.
Companieshaveembarkedonwhatlookslikethebeginningsofare-runofthemergersandacquisitionsM＆Awavethatdefinedthesecondbubblyhalfofthe1990s.Thatperiodreadersmightrecallwascharacterizedbyacollectivesplurgethatsawthecreationofsomeofthemostindebtedcompaniesinhistorymanyofwhichlaterwentbankruptorwerethemselvesbrokenup.WildbiddingfortelecomsinternetandmediaassetsnottomentionthemadnessthatwasDaimler’s$40billionmotoringtakeoverin1998-1999ofChryslerortheTime-Warner/AOLmega-mergerin2000helpedtogivemergersathoroughlybadname.AconsensusemergedthatM＆Awasagreatwayforinvestmentbankstoreaprichfeesandasurewayforambitiousmanagerstobetrayinvestorsbytrashingthevalueoftheirshares.NowM＆Aisback.ItsreturnisaglobalphenomenonbutitisperhapsmoststrikinginEuropewheresofarthisyeartherehasbeenastreamofdealsworthmorethan$600billionintotalaround40%higherthaninthesameperiodof2004.ThelatesteffortcamethisweekwhenFrance’sSaint-Gobainabuilding-materialsfirmunveiledthedetailsofits￡3.6billion$6.5billionhostilebidforBPBaBritishrival.Inthefirsthalfoftheyearcross-borderactivitywasupthreefoldoverthesameperiodlastyear.EvenFranceTelecomwhichwasleftalmostbankruptattheendofthelastmergerwaverecentlyboughtAmenaaSpanishmobileoperator.Shareholder’sapprovalofallthesedealsraisesaninterestingquestionforcompanieseverywhere:areinvestorsrighttothinkthinthesemergersaremorelikelytosucceedthanearlieronesTherearetwoanswers.Thefirstisthatpastmergersmayhavebeenjudgedtooharshly.ThesecondisthatthepresentrashofEuropeandealsdoeslookmorerationalbut—andthecaveatiscrucial—onlysofar.Thepatternmaynothold.M＆A’spoorreputationstemsnotonlyfromthestringofspectacularfailuresinthe1990sbutalsofromstudiesthatshowedvaluedestructionforacquiringshareholdersin80%ofdeals.Butmorerecentstudiesbyeconomistshaveintroducedanoteofcaution.Investorsshouldlookatthenumberofdealsthatsucceedorfailtypicallymeasuredbytheimpactonthesharepriceratherthanasyoumightthinkweighingthembysize.ForexamplenoonedoubtsthattheDaimler-Chryslermergerdestroyedvalue.ThecombinedmarketvalueofthetwofirmsisstillbelowthatofDaimleralonebeforethedeal.ThissingledealaccountedforhalfofallGermanM＆Aactivitybyvaluein1998and1999andprobablydominatedpeople’sthinkingaboutmergerstothesamedegree.Throwinafewothersuchmonstersanditisnowonderthatbroadstudieshavetendedtofindthatmergersareabadidea.Thetruepictureismorecomplicated.ThecaseofDaimler-Chryslerisemployedinthetextas______.
Sometimeswehavespecificproblemswithourmother;sometimeslifewithhercanjustbehardwork.Iftherearedifficultiesinyour1it’sbesttodealwiththem2rememberthatany3shouldbedone4personorbyletter.Thetelephoneisnotagood5becauseitistooeasy6eithersideto7theconversation. Explaintoher8youfinddifficultinyourrelationshipandthen9somenewarrangementsthatyouthinkwouldestablisha10balancebetweenyou.Sometimeswehold11fromestablishingsuchboundariesbecauseweareafraidthatdoing12impliesweare13her.Weneedtorememberthatbeing14fromourmotherdoesnot15meanthatWenolongerloveher.Iftheconflictis16andyoucannotfindawayto17ityoumightdecidetogiveupyourrelationshipwithyourmotherforawhile.Someofmypatientshad18"trialseparations".The19allowedthingstosimmerdownenabling20. 14
Companieshaveembarkedonwhatlookslikethebeginningsofare-runofthemergersandacquisitionsM＆Awavethatdefinedthesecondbubblyhalfofthe1990s.Thatperiodreadersmightrecallwascharacterizedbyacollectivesplurgethatsawthecreationofsomeofthemostindebtedcompaniesinhistorymanyofwhichlaterwentbankruptorwerethemselvesbrokenup.WildbiddingfortelecomsinternetandmediaassetsnottomentionthemadnessthatwasDaimler’s$40billionmotoringtakeoverin1998-1999ofChryslerortheTime-Warner/AOLmega-mergerin2000helpedtogivemergersathoroughlybadname.AconsensusemergedthatM＆Awasagreatwayforinvestmentbankstoreaprichfeesandasurewayforambitiousmanagerstobetrayinvestorsbytrashingthevalueoftheirshares.NowM＆Aisback.ItsreturnisaglobalphenomenonbutitisperhapsmoststrikinginEuropewheresofarthisyeartherehasbeenastreamofdealsworthmorethan$600billionintotalaround40%higherthaninthesameperiodof2004.ThelatesteffortcamethisweekwhenFrance’sSaint-Gobainabuilding-materialsfirmunveiledthedetailsofits￡3.6billion$6.5billionhostilebidforBPBaBritishrival.Inthefirsthalfoftheyearcross-borderactivitywasupthreefoldoverthesameperiodlastyear.EvenFranceTelecomwhichwasleftalmostbankruptattheendofthelastmergerwaverecentlyboughtAmenaaSpanishmobileoperator.Shareholder’sapprovalofallthesedealsraisesaninterestingquestionforcompanieseverywhere:areinvestorsrighttothinkthinthesemergersaremorelikelytosucceedthanearlieronesTherearetwoanswers.Thefirstisthatpastmergersmayhavebeenjudgedtooharshly.ThesecondisthatthepresentrashofEuropeandealsdoeslookmorerationalbut—andthecaveatiscrucial—onlysofar.Thepatternmaynothold.M＆A’spoorreputationstemsnotonlyfromthestringofspectacularfailuresinthe1990sbutalsofromstudiesthatshowedvaluedestructionforacquiringshareholdersin80%ofdeals.Butmorerecentstudiesbyeconomistshaveintroducedanoteofcaution.Investorsshouldlookatthenumberofdealsthatsucceedorfailtypicallymeasuredbytheimpactonthesharepriceratherthanasyoumightthinkweighingthembysize.ForexamplenoonedoubtsthattheDaimler-Chryslermergerdestroyedvalue.ThecombinedmarketvalueofthetwofirmsisstillbelowthatofDaimleralonebeforethedeal.ThissingledealaccountedforhalfofallGermanM＆Aactivitybyvaluein1998and1999andprobablydominatedpeople’sthinkingaboutmergerstothesamedegree.Throwinafewothersuchmonstersanditisnowonderthatbroadstudieshavetendedtofindthatmergersareabadidea.Thetruepictureismorecomplicated.Accordingtothetexttheauthorwouldagreethat______.
设fx是-∞+∞上以T为周期的周期函数且．此外又存在常数L＞0使得对任何xy∈-∞+∞有|fx-fy|≤L|x-y|．求证．
Apairofdicerolledagainandagainwilleventuallyproducetwosixes.Similarlythevirusthatcausesinfluenzaisconstantlychangingatrandomandonedaywillmutateinawaythatwillenableittoinfectbillionsofpeopleandtokillmillions.Manyexpertsnowbelieveaglobaloutbreakofpandemicfluisoverdueandthatthenextonecouldbeasbadastheonein1918whichkilledsomewherebetween25mand50mpeople.Todayhoweveradvancesinmedicineofferrealhopethatanothersuchoutbreakcanbecontained—ifgovernmentsstartpreparingnow.Newresearchpublishedthisweeksuggeststhatarelativelysmallstockpileofanantiviraldrug—aslittleas3mdoses—couldbeenoughtolimitsharplyaflupandemicifthedrugsweredeployedquicklytopeopleintheareasurroundingtheinitialoutbreak.Thedrug’smanufacturerRocheistalkingtotheWorldHealthOrganisationaboutdonatingsuchastockpile.Thisisgoodnews.ButmuchmoreneedstobedoneespeciallywithanastystrainofavianfluspreadinginAsiawhichcouldmutateintoathreattohumans.SincetheSARSoutbreakin2003afewcountrieshavedevelopedplansinpreparationforsimilarepisodes.Butprogresshasbeenshamefullypatchyandthereisstillfartoolittleinternationalcoordination.Aglobalstockpileofdrugsalonewouldnotbemuchusewithoutanadequatesystemofsurveillancetoidentifyearlycasesandawayofdeliveringtreatmentquickly.Ifanoutbreakoccurredinaborderregionforexampleaswiftresponsewouldmostlikelydependonprioragreementsbetweendifferentcountriesaboutquarantineandcontainment.Reachingsuchagreementsisrarelyeasybutthatmakesthetaskallthemoreurgent.Richcountriestendtobebetterpreparedthanpooronesbutthisshouldbenoconsolationtothem.Fludoesnotrespectborders.Itisineveryone’sinteresttomakesurethatdevelopingcountriesespeciallyinAsiaarealsowellprepared.Manymaybridleatinterferencefromoutside.Butifrichernationswerewillingtodonateanti-viraldrugsandguaranteeasupplyofanyvaccinethatbecomesavailablepoorernationsmightbewillingtoreachagreementsoversurveillanceandpreparedness.Simplysortingoutafewdetailsnowwillhavelivesandrecriminationslater.WilltherebeenoughventilatorsmakesanddrugsWherewillpeoplebetreatedifthehospitalsoverflowWillfoodbedeliveredasnormalToomanycountrieshavenoanswerstothesequestions.Accordingtothetextwhichofthefollowingsisnotreadilymade
设y=fx二阶可导f’x≠0它的反函数是x=φy又f0=1f’0=f0=-1则=______．
Sometimeswehavespecificproblemswithourmother;sometimeslifewithhercanjustbehardwork.Iftherearedifficultiesinyour1it’sbesttodealwiththem2rememberthatany3shouldbedone4personorbyletter.Thetelephoneisnotagood5becauseitistooeasy6eithersideto7theconversation. Explaintoher8youfinddifficultinyourrelationshipandthen9somenewarrangementsthatyouthinkwouldestablisha10balancebetweenyou.Sometimeswehold11fromestablishingsuchboundariesbecauseweareafraidthatdoing12impliesweare13her.Weneedtorememberthatbeing14fromourmotherdoesnot15meanthatWenolongerloveher.Iftheconflictis16andyoucannotfindawayto17ityoumightdecidetogiveupyourrelationshipwithyourmotherforawhile.Someofmypatientshad18"trialseparations".The19allowedthingstosimmerdownenabling20. 16
Sometimeswehavespecificproblemswithourmother;sometimeslifewithhercanjustbehardwork.Iftherearedifficultiesinyour1it’sbesttodealwiththem2rememberthatany3shouldbedone4personorbyletter.Thetelephoneisnotagood5becauseitistooeasy6eithersideto7theconversation. Explaintoher8youfinddifficultinyourrelationshipandthen9somenewarrangementsthatyouthinkwouldestablisha10balancebetweenyou.Sometimeswehold11fromestablishingsuchboundariesbecauseweareafraidthatdoing12impliesweare13her.Weneedtorememberthatbeing14fromourmotherdoesnot15meanthatWenolongerloveher.Iftheconflictis16andyoucannotfindawayto17ityoumightdecidetogiveupyourrelationshipwithyourmotherforawhile.Someofmypatientshad18"trialseparations".The19allowedthingstosimmerdownenabling20. 18
设x≥0且fx=x求
Companieshaveembarkedonwhatlookslikethebeginningsofare-runofthemergersandacquisitionsM＆Awavethatdefinedthesecondbubblyhalfofthe1990s.Thatperiodreadersmightrecallwascharacterizedbyacollectivesplurgethatsawthecreationofsomeofthemostindebtedcompaniesinhistorymanyofwhichlaterwentbankruptorwerethemselvesbrokenup.WildbiddingfortelecomsinternetandmediaassetsnottomentionthemadnessthatwasDaimler’s$40billionmotoringtakeoverin1998-1999ofChryslerortheTime-Warner/AOLmega-mergerin2000helpedtogivemergersathoroughlybadname.AconsensusemergedthatM＆Awasagreatwayforinvestmentbankstoreaprichfeesandasurewayforambitiousmanagerstobetrayinvestorsbytrashingthevalueoftheirshares.NowM＆Aisback.ItsreturnisaglobalphenomenonbutitisperhapsmoststrikinginEuropewheresofarthisyeartherehasbeenastreamofdealsworthmorethan$600billionintotalaround40%higherthaninthesameperiodof2004.ThelatesteffortcamethisweekwhenFrance’sSaint-Gobainabuilding-materialsfirmunveiledthedetailsofits￡3.6billion$6.5billionhostilebidforBPBaBritishrival.Inthefirsthalfoftheyearcross-borderactivitywasupthreefoldoverthesameperiodlastyear.EvenFranceTelecomwhichwasleftalmostbankruptattheendofthelastmergerwaverecentlyboughtAmenaaSpanishmobileoperator.Shareholder’sapprovalofallthesedealsraisesaninterestingquestionforcompanieseverywhere:areinvestorsrighttothinkthinthesemergersaremorelikelytosucceedthanearlieronesTherearetwoanswers.Thefirstisthatpastmergersmayhavebeenjudgedtooharshly.ThesecondisthatthepresentrashofEuropeandealsdoeslookmorerationalbut—andthecaveatiscrucial—onlysofar.Thepatternmaynothold.M＆A’spoorreputationstemsnotonlyfromthestringofspectacularfailuresinthe1990sbutalsofromstudiesthatshowedvaluedestructionforacquiringshareholdersin80%ofdeals.Butmorerecentstudiesbyeconomistshaveintroducedanoteofcaution.Investorsshouldlookatthenumberofdealsthatsucceedorfailtypicallymeasuredbytheimpactonthesharepriceratherthanasyoumightthinkweighingthembysize.ForexamplenoonedoubtsthattheDaimler-Chryslermergerdestroyedvalue.ThecombinedmarketvalueofthetwofirmsisstillbelowthatofDaimleralonebeforethedeal.ThissingledealaccountedforhalfofallGermanM＆Aactivitybyvaluein1998and1999andprobablydominatedpeople’sthinkingaboutmergerstothesamedegree.Throwinafewothersuchmonstersanditisnowonderthatbroadstudieshavetendedtofindthatmergersareabadidea.Thetruepictureismorecomplicated.Accordingtothetextacollectiveopiniononthemergersandacquisitionsalsoconcentrateson______.
Manycountrieshaveatraditionofinvitingforeignerstorulethem.TheEnglishcalledinWilliamofOrangein1688anddependingonyourinterpretationofhistoryWilliamofNormandyin1066.Bothdidratheragoodjob.ReturningthecomplimentAlbaniaaskedawell-bredEnglishmancalledAubgreyHerberttobetheirkinginthe1920s.Herefused—andtheyendedupwithseveralcovescalledZog.Americathecountryofimmigrantshasnotruckwithimportedforeigntalent.ArticletwooftheConstitutionsaysthatnopersonexceptanatural-borncitizen...shallbeeligibletotheofficeofthepresident.Thisisnowbeingchallengedbyaparticularlyirresistibleimmigrant:ArnoldSchwarzenegger.BarelyayearhaspassedsincetheerstwhilecyborgswepttovictoryinCalifornia’srecallelectionyetthereisalreadyanAmend-for-ArnoldcampaigncollectingsignaturestolettheAustrian-borngovernorhaveagoattheWhiteHouse.GeorgeBushseniorhasweighedinonhisbehalf.ThereareseveralArnoldamendmentsinCongress:oneallowsforeignerswhohavebeennaturalizedcitizensfor20yearstobecomepresident.TheAustrianbecameAmericanin1983.Itiseasytodismissthehooplaasanotherregrettableexampleofloopycelebritypolitics.Mr.Schwarzeneggerhasmadeadecentstartasgovernorbuthehasdonelittleasyettochangethestructureofhisdysfunctionalstate.IndeedevenifthelawwerechangedhecouldwellbeelbowedasidebyanotherincomerthistimefromCanada:theDemocraticgovernorofMichiganJenniferGranholmwhoappearstohavefewerskeletonsinherclosetthanthehedonisticactor.MoreoverchangingtheAmericanconstitutionisnododdle.Ithashappenedonly17timessince1791whenthefirsttenamendmentswerecodifiedasthebillofrights.Tochangetheconstitutionanamendmenthastobeapprovedbytwo-thirdsofbothhousesofCongressandthentoberatifiedbythree-quartersofthe50states.TheArnoldamendmentishardlyinthesamecategoryasabolishingslaveryorgivingwomenthevote.AndassomewagspointoutAustrianimportshaveaprettydodgyrecordofrunningmilitarysuperpowers.Itcanbeinferredfromtheconcludingparagraphtbat______.
Manycountrieshaveatraditionofinvitingforeignerstorulethem.TheEnglishcalledinWilliamofOrangein1688anddependingonyourinterpretationofhistoryWilliamofNormandyin1066.Bothdidratheragoodjob.ReturningthecomplimentAlbaniaaskedawell-bredEnglishmancalledAubgreyHerberttobetheirkinginthe1920s.Herefused—andtheyendedupwithseveralcovescalledZog.Americathecountryofimmigrantshasnotruckwithimportedforeigntalent.ArticletwooftheConstitutionsaysthatnopersonexceptanatural-borncitizen...shallbeeligibletotheofficeofthepresident.Thisisnowbeingchallengedbyaparticularlyirresistibleimmigrant:ArnoldSchwarzenegger.BarelyayearhaspassedsincetheerstwhilecyborgswepttovictoryinCalifornia’srecallelectionyetthereisalreadyanAmend-for-ArnoldcampaigncollectingsignaturestolettheAustrian-borngovernorhaveagoattheWhiteHouse.GeorgeBushseniorhasweighedinonhisbehalf.ThereareseveralArnoldamendmentsinCongress:oneallowsforeignerswhohavebeennaturalizedcitizensfor20yearstobecomepresident.TheAustrianbecameAmericanin1983.Itiseasytodismissthehooplaasanotherregrettableexampleofloopycelebritypolitics.Mr.Schwarzeneggerhasmadeadecentstartasgovernorbuthehasdonelittleasyettochangethestructureofhisdysfunctionalstate.IndeedevenifthelawwerechangedhecouldwellbeelbowedasidebyanotherincomerthistimefromCanada:theDemocraticgovernorofMichiganJenniferGranholmwhoappearstohavefewerskeletonsinherclosetthanthehedonisticactor.MoreoverchangingtheAmericanconstitutionisnododdle.Ithashappenedonly17timessince1791whenthefirsttenamendmentswerecodifiedasthebillofrights.Tochangetheconstitutionanamendmenthastobeapprovedbytwo-thirdsofbothhousesofCongressandthentoberatifiedbythree-quartersofthe50states.TheArnoldamendmentishardlyinthesamecategoryasabolishingslaveryorgivingwomenthevote.AndassomewagspointoutAustrianimportshaveaprettydodgyrecordofrunningmilitarysuperpowers.ComparedwithJenniferGranholmMr.Schwarzeneggerisatdisadvantagedueto______.
[A]DrDanielStanleyanoceanographerhasfoundvolcanicshardsinEgyptthathebelievesarelinkedtotheexplosion.ComputersimulationsbyMikeRampinoaclimatemodelerfromNewYorkUniversityshowthattheresultingashcloudcouldhaveplungedtheareaintodarknessaswellasgeneratinglightningandhailtwoofthe10plagues. [B]Thecloudcouldhavealsoreducedtherainfallcausingadrought.IftheNilehadthenbeenpoisonedbytheeffectsoftheeruptionpollutioncouldhaveturneditredashappenedinarecentenvironmentaldisasterinAmerica.Thesamepollutioncouldhavedrivenmillionsoffrogsontothelandthesecondplague.Onlandthefrogswoulddieremovingtheonlyobstacletoanexplosionoffliesandlice—thethirdandfourthplagues.Thefliescouldhavetransmittedfataldiseasestocattlethefifthplagueandboilsandblisterstohumansthesixthplague. [C]MoseswhichwillbebroadcastinDecember2002willsuggestthatmuchoftheBiblestorycanheexplainedbyasinglenaturaldisasterahugevolcaniceruptionontheGreekislandofSantoriniinthe16thcenturyBC. [D]Thehour-longdocumentaryarguesthateventhestoryofthepartingoftheRedSeawhichallowedMosestoleadtheHebrewstosafetywhilethepursuingEgyptianarmywasdrownedmayhaveitsoriginsintheeruption.Itrepeatsthetheorythat"RedSea"isamistranslationoftheSeaofReedsamuchshallowerswamp. [E]TheprogrammetellsthestoryofhowMosesledtheHebrewsoutofEgyptafteraseriesofplagueshaddevastatedthecountry.Butitalsousesnewscientificresearchtoarguethatmanyoftheeventssurroundingtheexoduscouldhavebeentriggeredbytheeruptionwhichwouldhavebeenathousandtimesmorepowerfulthananuclearbomb. [F]ComputersimulationsshowthattheSantorinieruptioncouldhavetriggereda600ft-hightidalwavetravelingatabout400milesanhourwhichwouldhavebeen6fthighandahundredmileslongwhenitreachedtheEgyptiandelta.Suchaneventwouldhavebeenrememberedforgenerationsandmayhaveprovidedtheinspirationforthestory. [G]FreshevidencethattheBiblicalplaguesandthepartingoftheRedSeawerenaturaleventsratherthanmythsormiraclesistobepresentedinanewBBCdocumentary. Order: 44
Sometimeswehavespecificproblemswithourmother;sometimeslifewithhercanjustbehardwork.Iftherearedifficultiesinyour1it’sbesttodealwiththem2rememberthatany3shouldbedone4personorbyletter.Thetelephoneisnotagood5becauseitistooeasy6eithersideto7theconversation. Explaintoher8youfinddifficultinyourrelationshipandthen9somenewarrangementsthatyouthinkwouldestablisha10balancebetweenyou.Sometimeswehold11fromestablishingsuchboundariesbecauseweareafraidthatdoing12impliesweare13her.Weneedtorememberthatbeing14fromourmotherdoesnot15meanthatWenolongerloveher.Iftheconflictis16andyoucannotfindawayto17ityoumightdecidetogiveupyourrelationshipwithyourmotherforawhile.Someofmypatientshad18"trialseparations".The19allowedthingstosimmerdownenabling20. 20
Apairofdicerolledagainandagainwilleventuallyproducetwosixes.Similarlythevirusthatcausesinfluenzaisconstantlychangingatrandomandonedaywillmutateinawaythatwillenableittoinfectbillionsofpeopleandtokillmillions.Manyexpertsnowbelieveaglobaloutbreakofpandemicfluisoverdueandthatthenextonecouldbeasbadastheonein1918whichkilledsomewherebetween25mand50mpeople.Todayhoweveradvancesinmedicineofferrealhopethatanothersuchoutbreakcanbecontained—ifgovernmentsstartpreparingnow.Newresearchpublishedthisweeksuggeststhatarelativelysmallstockpileofanantiviraldrug—aslittleas3mdoses—couldbeenoughtolimitsharplyaflupandemicifthedrugsweredeployedquicklytopeopleintheareasurroundingtheinitialoutbreak.Thedrug’smanufacturerRocheistalkingtotheWorldHealthOrganisationaboutdonatingsuchastockpile.Thisisgoodnews.ButmuchmoreneedstobedoneespeciallywithanastystrainofavianfluspreadinginAsiawhichcouldmutateintoathreattohumans.SincetheSARSoutbreakin2003afewcountrieshavedevelopedplansinpreparationforsimilarepisodes.Butprogresshasbeenshamefullypatchyandthereisstillfartoolittleinternationalcoordination.Aglobalstockpileofdrugsalonewouldnotbemuchusewithoutanadequatesystemofsurveillancetoidentifyearlycasesandawayofdeliveringtreatmentquickly.Ifanoutbreakoccurredinaborderregionforexampleaswiftresponsewouldmostlikelydependonprioragreementsbetweendifferentcountriesaboutquarantineandcontainment.Reachingsuchagreementsisrarelyeasybutthatmakesthetaskallthemoreurgent.Richcountriestendtobebetterpreparedthanpooronesbutthisshouldbenoconsolationtothem.Fludoesnotrespectborders.Itisineveryone’sinteresttomakesurethatdevelopingcountriesespeciallyinAsiaarealsowellprepared.Manymaybridleatinterferencefromoutside.Butifrichernationswerewillingtodonateanti-viraldrugsandguaranteeasupplyofanyvaccinethatbecomesavailablepoorernationsmightbewillingtoreachagreementsoversurveillanceandpreparedness.Simplysortingoutafewdetailsnowwillhavelivesandrecriminationslater.WilltherebeenoughventilatorsmakesanddrugsWherewillpeoplebetreatedifthehospitalsoverflowWillfoodbedeliveredasnormalToomanycountrieshavenoanswerstothesequestions.Accordingtothetextitisupsettingthat______.
设y=sin4x则yn=______．
反常积分=______．
Sometimeswehavespecificproblemswithourmother;sometimeslifewithhercanjustbehardwork.Iftherearedifficultiesinyour1it’sbesttodealwiththem2rememberthatany3shouldbedone4personorbyletter.Thetelephoneisnotagood5becauseitistooeasy6eithersideto7theconversation. Explaintoher8youfinddifficultinyourrelationshipandthen9somenewarrangementsthatyouthinkwouldestablisha10balancebetweenyou.Sometimeswehold11fromestablishingsuchboundariesbecauseweareafraidthatdoing12impliesweare13her.Weneedtorememberthatbeing14fromourmotherdoesnot15meanthatWenolongerloveher.Iftheconflictis16andyoucannotfindawayto17ityoumightdecidetogiveupyourrelationshipwithyourmotherforawhile.Someofmypatientshad18"trialseparations".The19allowedthingstosimmerdownenabling20. 12
设有一半椭球形水池深为b池口是半径为a的圆若以每秒v单位的速度向池内注水则水深增加的速度与水深h的关系是______．
Manycountrieshaveatraditionofinvitingforeignerstorulethem.TheEnglishcalledinWilliamofOrangein1688anddependingonyourinterpretationofhistoryWilliamofNormandyin1066.Bothdidratheragoodjob.ReturningthecomplimentAlbaniaaskedawell-bredEnglishmancalledAubgreyHerberttobetheirkinginthe1920s.Herefused—andtheyendedupwithseveralcovescalledZog.Americathecountryofimmigrantshasnotruckwithimportedforeigntalent.ArticletwooftheConstitutionsaysthatnopersonexceptanatural-borncitizen...shallbeeligibletotheofficeofthepresident.Thisisnowbeingchallengedbyaparticularlyirresistibleimmigrant:ArnoldSchwarzenegger.BarelyayearhaspassedsincetheerstwhilecyborgswepttovictoryinCalifornia’srecallelectionyetthereisalreadyanAmend-for-ArnoldcampaigncollectingsignaturestolettheAustrian-borngovernorhaveagoattheWhiteHouse.GeorgeBushseniorhasweighedinonhisbehalf.ThereareseveralArnoldamendmentsinCongress:oneallowsforeignerswhohavebeennaturalizedcitizensfor20yearstobecomepresident.TheAustrianbecameAmericanin1983.Itiseasytodismissthehooplaasanotherregrettableexampleofloopycelebritypolitics.Mr.Schwarzeneggerhasmadeadecentstartasgovernorbuthehasdonelittleasyettochangethestructureofhisdysfunctionalstate.IndeedevenifthelawwerechangedhecouldwellbeelbowedasidebyanotherincomerthistimefromCanada:theDemocraticgovernorofMichiganJenniferGranholmwhoappearstohavefewerskeletonsinherclosetthanthehedonisticactor.MoreoverchangingtheAmericanconstitutionisnododdle.Ithashappenedonly17timessince1791whenthefirsttenamendmentswerecodifiedasthebillofrights.Tochangetheconstitutionanamendmenthastobeapprovedbytwo-thirdsofbothhousesofCongressandthentoberatifiedbythree-quartersofthe50states.TheArnoldamendmentishardlyinthesamecategoryasabolishingslaveryorgivingwomenthevote.AndassomewagspointoutAustrianimportshaveaprettydodgyrecordofrunningmilitarysuperpowers.Theauthorofthetextmakesacontrastin______.
Inthepastyearalothaschangedinthefieldofhumanspaceflight.46InJanuaryPresidentGeorgeBushbrushedasidethefactthatAmerica’sentirespace-shuttlefleetwasgroundedwhenheannouncedgrandioseplanstoputpeoplebackonthemoonandthentolaunchamannedmissiontoMars.47InJuneButtRutananAmericanaeronauticalengineershowedthathumanspaceflightwasnolongerthepreserveofgovernmentsbysendingamantotheedgeofspaceinSpaceShipOneaprivatelyfinancedvehiclethatcostaboutthesametobuildasaluxuryyacht.ThatwasfollowedinSeptemberbySirRichardBransontheBritishentrepreneurbehindtheVirginbrandannouncingthathehadsignedadealwithMrRutantoworkonplansforafleetoffivesuborbitalvehiclesdevelopedfromSpaceShipOne. 48NowinthedyingdaysoftheyearAmerica’sCongresshaspassedabillthatunravelsatangleaboutwhowouldberesponsibleforregulatingthefledglingindustryandunderwhatterms.49ThebillalsoallowspassengerstoflyontheunderstandingthatthisnewgenerationofvehiclesmaynotbeassafeastakingacommercialflightbetweensayNewYorkandLondon. TheofficiallinefromVirginGalacticaasSirRichard’slatestventureismodestlynamedisthatthiscomingchangeinthelawmakesnopracticaldifferencetothefirm’splanssincetheydonotintendtoflyunlesstheycanmaketheirspacecraftassafeasaprivatejet.Butitmustsurelycomeassomesortofrelief.InanycaseWillWhitehorndirectorofcorporateaffairsatVirgin’sheadquartersinLondonandsoontobecomethepresidentofVirginGalacticasaysthatworkisunderwayonamockupoftheinteriorofanewspacecraftthatwillholdfivepassengers.50Virginhasalreadycommitted$20mtowardslicensingtheSpaceShipOnetechnologyfromMr.RutanandhisfinancialbackerPaulAllenasoftwarebillionaire. 50
Inthepastyearalothaschangedinthefieldofhumanspaceflight.46InJanuaryPresidentGeorgeBushbrushedasidethefactthatAmerica’sentirespace-shuttlefleetwasgroundedwhenheannouncedgrandioseplanstoputpeoplebackonthemoonandthentolaunchamannedmissiontoMars.47InJuneButtRutananAmericanaeronauticalengineershowedthathumanspaceflightwasnolongerthepreserveofgovernmentsbysendingamantotheedgeofspaceinSpaceShipOneaprivatelyfinancedvehiclethatcostaboutthesametobuildasaluxuryyacht.ThatwasfollowedinSeptemberbySirRichardBransontheBritishentrepreneurbehindtheVirginbrandannouncingthathehadsignedadealwithMrRutantoworkonplansforafleetoffivesuborbitalvehiclesdevelopedfromSpaceShipOne. 48NowinthedyingdaysoftheyearAmerica’sCongresshaspassedabillthatunravelsatangleaboutwhowouldberesponsibleforregulatingthefledglingindustryandunderwhatterms.49ThebillalsoallowspassengerstoflyontheunderstandingthatthisnewgenerationofvehiclesmaynotbeassafeastakingacommercialflightbetweensayNewYorkandLondon. TheofficiallinefromVirginGalacticaasSirRichard’slatestventureismodestlynamedisthatthiscomingchangeinthelawmakesnopracticaldifferencetothefirm’splanssincetheydonotintendtoflyunlesstheycanmaketheirspacecraftassafeasaprivatejet.Butitmustsurelycomeassomesortofrelief.InanycaseWillWhitehorndirectorofcorporateaffairsatVirgin’sheadquartersinLondonandsoontobecomethepresidentofVirginGalacticasaysthatworkisunderwayonamockupoftheinteriorofanewspacecraftthatwillholdfivepassengers.50Virginhasalreadycommitted$20mtowardslicensingtheSpaceShipOnetechnologyfromMr.RutanandhisfinancialbackerPaulAllenasoftwarebillionaire. 48
与矩阵可以交换的矩阵是______．
In1929JohnD.Rockefellerdecideditwastimetosellshareswhenevenashoe-shineboyofferedhimasharetip.DuringthepastweekTheEconomist’seconomicseditorhasbeen-advisedbyataxidriveraplumberandahairdresserthatyoucan’tgowronginvestinginhousing—themoreyouownthebetter.IsthisasignthatitistimetogetoutAttheveryleastashousepricesaroundtheworldclimbtoeverloftierheightsandmoreandmorepeoplejumpontothebuy-to-letladderitistimetoexposesomeofthefallaciesregularlytrottedoutbysomanyself-appointedhousingexperts.Onecommonerroristhathousepricesmustcontinuetorisebecauseofalimitedsupplyofland.ForinstanceitisarguedthathousepriceswillalwaysriseinLondonbecauselotsofpeoplewanttolivehere.Butthisconfusesthelevelofpriceswiththeirrateofchange.Homepricesareboundtobehigherinbigcitiesbecauseoflandscarcitybutthisdoesnotguaranteethaturbanhousepriceswillkeeprisingindefinitely—justlookatTokyo’shugeprice-dropssince1990.Andthoughitistruethatafixedsupplyofhomesmaypushuphousepricesifthepopulationisrisingthiswouldimplyasteadyriseinpricesnotthe20%annualjumpsofrecentyears.Asecondflawedargumentisthatlowinterestratesmakebuyingahomecheaperandsopushupdemandandprices.Lowerinterestratesmayhaveallowedsomepeoplewhootherwisecouldnothaveaffordedamortgagetobuyahome.Butmanyborrowerswhothinkmortgagesarecheaperaresufferingfrommoneyillusion.Interestratesarenotverylowinrealinflation-adjustedterms.Initialinterestpaymentsmayseemlowinrelationtoincomebutbecauseinflationisalsolowitwillnoterodetherealburdenofdebtasswiftlyasitoncedid.Soinlateryearsmortgagepaymentswillbemuchlargerinrealterms.Toarguethatlownominalinterestratesmakebuyingahomecheaperislikearguingthatacarloanpaidoffoverfouryearsischeaperthanonerepaidovertwoyears.FallacynumberthreeisafavouriteclaimofAlanGreenspanchairmanofAmerica’sFederalReserve.Thisisthatpricebubblesarelesslikelyinhousingthaninthestockmarketbecausehighertransactioncostsdiscouragespeculation.Infactseveralstudieshaveshownthatbothintheoryandinpracticebubblesaremorelikelyinhousingthaninshares.AstudybytheIMFfindsthatasharpriseinhousepricesisfarmorelikelytobefollowedbyabustthanisashare-priceboom.Whatistherelationshipbetweentheopeningparagraphandtherestofthetext
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