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已知：将矩形纸片ABCD折叠，使点A与点C重合（点D与D′为对应点），折痕为EF，连接AF、AC交EF于点O． （1）如图1，求证：四边形AECF为菱形； （2）如图2，若FC＝2OE，连接DO...
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矩形纸片ABCDAB＝9BC＝6在矩形边上有一点P且DP＝3．将矩形纸片折叠使点B与点P重合折痕所
在矩形纸片ABCD中AB=6BC=81将矩形纸片沿BD折叠使点A.落在点E.处如图①设DE和BC相交
把图一的矩形纸片ABCD折叠B.C.两点恰好重合落在AD边上的点P.处如图二.已知∠MPN=90°P
矩形纸片ABCDAB=9BC=6在矩形边上有一点P且DP=3．将矩形纸片折叠使点B与点P重合折痕所
如图12在矩形纸片ABCD中AD=6AB=9点M.N.分别在ABDC上M.不与A.B.重合N.不与C
把图一的矩形纸片ABCD折叠B.C.两点恰好重合落在AD边上的点P.处如图二已知∠MPN=900PM
矩形纸片ABCDAD=3AB若将矩形纸片ABCD折叠使点A与点C重合折痕交AC于点O经过点O的直线交
对给定的一张矩形纸片ABCD进行如下操作先沿CE折叠使点B.落在CD边上如图①再沿CH折叠这时发现点
如图将矩形纸片ABCD折叠使点A与点C重合折痕为EF若AB=4BC=2那么线段EF的长为.
如图对折矩形纸片ABCD使AB与DC重合得到折痕EF将纸片展平再一次折叠使点D.落到EF上G.点处并
，展平纸片后∠DAG的大小为 A.30°
45°
60°
75°
把图一的矩形纸片ABCD折叠B.C.两点恰好重合落在AD边上的点P.处如图二已知∠MPN=90°PM
将矩形纸片ABCD折叠使点C.与点A.重合然后展开折痕为EF连结AECF求证四边形AECF是菱形.
如图.矩形纸片ABCD中已知AD=8折叠纸片使AB边与对角线AC重合点B.落在点F.处折痕为AE且E
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1动手操作如图①将矩形纸片ABCD折叠使点D.与点B.重合点C.落在点处折痕为EF若∠ABE=20°
如图将矩形纸片ABCD折叠使点D.与点B.重合点C.落在点C.′处折痕为EF若∠ABE=20°那么∠
将一张矩形的纸片ABCD沿EF折叠使点D与点B重合如图请你观察图形有全等三角形吗请说明理由.
矩形纸片ABCDAB=9BC=6在矩形边上有一点P.且DP=3.将矩形纸片折叠使点B.与点P.重合折
矩形纸片ABCDAB=9BC=6在矩形边上有一点P.且DP=3.将矩形纸片折叠使点B.与点P.重合折
1动手操作如图①将矩形纸片ABCD折叠使点D.与点B.重合点C.落在点处折痕为EF若∠ABE=20°
将一张矩形的纸片ABCD沿EF折叠使点D与点B重合如图请你观察图形有全等三角形吗请说明理由.
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RecentlyPewResearchCenterannouncedthatoveraquarterofAmericanshavesharedaselfieonline.Unsurprisinglythepracticeofphotographingoneselfandsharingthatimageviasocialmediahas51amongallagegroups.Evidenceofitsmainstreamnatureisseeninotheraspectsofourculturetoo.LastyearselfiewasnotonlyaddedtotheOxfordEnglishDictionarybutalsonamedWordoftheYear. Yetdespitethehugenumberofpeoplepracticingit52isalsosurroundingselfie.Anassumptionthatsharingselfiesisembarrassingrunsthroughoutthejournalisticandscholarlycoverageonthetopic.Negativewordslikeself﹣centeredand53haveinevitablybecomeapartofanyconversationaboutselfiesamongscholars. ButoveraquarterofallAmericansarerelyingonit.WhyTheusualreasonsgivenbyscholars﹣self﹣centerandfame﹣seeking﹣seemtoo54toexplainsuchacrowdacting.Thereisalwaysmoretoasocialculturalpracticethanwhat55. Simplyputphysicalanddigitaltechnologymakeitpossible.Theideathattechnology56thesocialworldandourliveshasbeenrecognizedbypeople.Tosomeextentworldisshapedbytechnologicalrevolutions.Theselfieisnotan57formofexpression.Artistshavecreatedself﹣portraitsforcenturiesfromcavetooilpaintingstoearlyphotographyandmodernart.Peopleare58theirfeelingsandthoughtsthroughcertainmedia.What'soriginalabouttoday'sselfieisitspublicpopularity.Technologicaladvancement59theself﹣portraitusedtoberestrictedtotheartworldandgaveittothemasses.Thosedigitalfront﹣facingcamerassocialmediaplatformsandwirelesscommunicationsconvenientlyavailablemakeselfieajob60anytimeanywhere. BesidesWearenot61beingslivingbyourselves.Wearesocialbeingswholiveinsocialcommunitiesandassuchourlivesarefundamentallyformedbysocialrelationswithotherpeople.Asphotosmeanttobe62selfiesarenotindividualacts;theyaresocialgestures.Selfiesaswellasourpresenceonsocialmediagenerallyareapartofidentitywork﹣﹣theworkthatwedoonadailybasisto63thatweareseenbyothersaswewishtobeseen.Infactthecraftinganddisplayofidentityhaslongbeenunderstoodasasocialprocess.Theselfieswetakeandshowaretopresenta64imageofussoastobecomeapartofouridentityformationand65. 51.A.flowered B.returned C.imposed D.functioned 52.A.negotiation B.criticism C.regret D.punishment 53.A.self﹣contained B.self﹣evident C.self﹣absorbed D.self﹣financed 54.A.necessary B.smart C.certain D.shallow 55.A.meetstheeye B.takesthelead C.raisesthealarm D.makesthepoint 56.A.operates B.produces C.structures D.ruins 57.A.advanced B.new C.intelligent D.available 58.A.offering B.revising C.inspiring D.conveying 59.A.liberated B.tagged C.honoured D.maintained 60.A.atlength B.withease C.atlarge D.withregards 61.A.isolated B.courageous C.traditional D.civilized 62.A.saved B.shared C.updated D.deleted 63.A.claim B.suppose C.ensure D.signal 64.A.fashionable B.skillful C.mysterious D.particular 65.A.summary B.evaluation C.monitoring D.exhibition
小明按图甲连接电路闭合开关灯泡L1的功率为P1．他将一个阻值大于L1的灯泡L2串联接入电路如图乙闭合开关后L1L2的功率分别为P1'P2'不计温度对灯泡电阻的影响电源电压恒定下列关系式正确的是
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MustafaKemalAtatürkthefounderoftheTurkishRepublicdevotedApril23tothechildrenoftheWorldtostressthat61werethefutureofnation.Since1920Turkeyhasbeen62celebrateApril23asNationalSovereigntyandChildren'sDay. Children'sDayprovides63uniqueopportunitytocontributetointernationalpeaceandsolidarity团结.InDubaioverthelastfouryears64thehelpoftheConsulateGeneraloftheTurkishRepublicinDubaiwehaveorganizedfour65successcharitycelebrationstomarkApril23Children'sDay.ManyinternationalschoolsandperformancegroupsofdifferentcountriesinDubaitookpart.Wereachedanaudienceofnearly4000peopleandthe66participateofmorethan50differentchildrenperformancegroups67includemorethan800children. ThisyearIam68honortoannounceourfifthcelebrationhappeningtoday.Thesuccessofthiseventlieswiththededicatedvolunteerworkofallorganization69partneraswellasthegenerousdonationsofthesponsors.InordertosupportDubaiAutismCenter'sannualautism自我中心主义awarenesscampaign70isorganizedforthewholemonthofAprilithasbeendecidedtodonatetheincomeoftheeventtotheDubaiAutismCenterDAC
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Anexaminationisaveryimportantpartoflifewhichisusedtotestaperson'sability.Butasyouknowmanyofushas51andareafraidofit.Thoughtheyknowthatexamsaretherefortheirbenefittheystillhavealotoffearforit.Itisveryoftenwefindsuchpeople.Youwillfindsuchpeoplealittleanxiousandalittlestressedabouttheirexams.Manyatimesuchnervescanbe52andusefultoyouforothersit'snervewrecking. Toovercomethesenerveswegotsometipsforyou.Don'tgettooexcitedabouttheexamsandforthatdon'tdrinktoomuchofthecoffeeorteatocopeupwiththeexam53.Eatahealthyandproperdietanddon'tworryabouttheexamswhileeating.Stresscanbeharmfultoyou54sometimes.Itcancausealotofproblemsinyourbodywhichcanbeincreasedheartbeatandbreathsweatingpalmsnervousattitudestressedaboutexamsetc… Beforemovingtotheexaminationhallyoupreparethoroughlyabouttheexams.Forthatfirstlymakealistofwhatistobestudiedandthenmakeanoverlookforthat.Nowdivideeachsubjectintosomeeasysub﹣classes.Gothroughsome55questionpapersandstudyyourearliermistakesmadeinit.Makeaperfectscheduleforyourstudy.Overlookthe56usedforansweringthequestionsImeantheirpatternandstyleofwriting.Solvefewmorequestionpaperstoachieveapropertime57.Takesomequickbreaksinyourstudytimesothatyoucan58aninterestinyourstudy. Nowwhiletakingtheexamsjustrelaxcontrolyourbreathandbelieveinyourself.Don'tpanicandbeoptimistic.Trytoreduceyourstressandbehappy.Don't59atleastanhourbeforetheexamsjustgetyourselfcalmeddown.Keepyourfocusonthepaperandtellyourselfthatyouare60prepared.Forexamsreachbeforethetimeandtryto61inthesurroundings.Don'tlistentoanyoftheexamrumoursbeforeexams.Ifyoustillcan'tcontrolyourexamstressthengoforsomemeditationorhypnosis冥想或催眠. Yeshypnosisarealgoodand62waytocontrolyournervesandreduceyourstress.Itcanbeseenthataperson'swholelifechangescompletelyonlyfromfewofthe63instructions.Inhypnosisapersondirectlydealsyou'reyoursubconsciousmindinsteadofyourconsciousmind.Thefactisyoursubconsciousmindisalotmore64andfollowingthanyourconsciousmindsoinstructingcorrectlytoyoursubconsciousmindresultsterrificinreducingyournerves.Hypnosisreducesyourfearoffailureand65asenseofconfidenceinyou.Itdecreasesyournegativityandforcesyoutothinkpositivelyaboutyourexams.Youalsomultiplesyourpotential.YousimplyneedtogetyourhandsonthehypnosisforexaminationMP3.Thisiseasilydownloadableandyou'llbewellonyourpathtocombatingandovercomingthecondition. 51.A.interest B.panic C.faith D.concept 52.A.motivating B.suffering C.shocking D.spreading 53.A.participation B.motivation C.expansion D.tension 54.A.mentally B.physically C.continuously D.exhaustingly 55.A.previous B.patient C.personal D.current 56.A.preparations B.lessons C.schedules D.techniques 57.A.administration B.management C.limitation D.scale 58.A.entertain B.contain C.maintain D.complain 59.A.revise B.rush C.instruct D.discuss 60.A.normally B.informally C.comparatively D.completely 61.A.mix B.resolve C.adjust D.focus 62.A.instructive B.significant C.effective D.romantic 63.A.appropriate B.splendid C.original D.negative 64.A.impatient B.obedient C.ordinary D.desirable 65.A.enjoys B.shakes C.generates D.generalizes
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为了解火箭升空过程中的相关运动状况兴趣小组制作了一模型火箭重为8牛不包含燃料发射后获取模型火箭的飞行高度与时间的关系如图所示． 1模型火箭燃料耗尽后仍能向上飞行一段距离这是因为模型火箭具有． 2图中标注的ABC三个位置中模型火箭的重力势能最小的是． 3模型火箭从最高点B下落到地面重力做功的功率是瓦．
将一蜡烛放在装有水的烧瓶前调整蜡烛和烧瓶至如图所示位置在墙壁上得到清晰的像．该像的性质是
RelaxduringajobinterviewFewpeopleactuallylikejobinterviewing.It'snerve﹣wracking摧残神经的tryingtoshowyourbestselftoaperfectstranger.36EThat'snoteasy.Buttherearesomewaystopullyourselftogetherandfeelmoreconfident.Preparesolidtalkingpoints.It'salwaysbesttoover﹣prepareforpossiblequestionsbynotonlyresearchingthecompanyandthepersoninterviewingyoubutalsobypreparinganswersandpracticingthoseresponses.Reviewtheskillsandexperiencesrequestedinthejobannouncementandhavetwotothreeexampleshowyouhavedemonstratedeachone.37GRemember:It'satwo﹣waystreet.Thisisconversationnotaninterrogation审问.38FRememberingthatthisisabackandforthdiscussionwhereyoucanandshouldaskquestionsaswellasanswerthemcanhelpyoufeelmorecomfortable.Justbreathe.39DYourbodywillrelaxlot.Youwanttoavoidupperchestbreathingasittendstojustmoveyoustressupwardtoyourface.40Aifyougointoaninterviewpickingapartyouroutfitorimperfectresponsesyou'reonlyhurtingyourchancesofcomingoffascalmandcollected.Turnoffyournegativeself﹣talkandthencreateadifferentself﹣talkmessagelikeIamheretosharethebestofmyabilityandthatisallIcanreallydo.Workitout.Puttinginsomegymtimethemorningofyourinterviewcanhelpyougetridofanynervoustension.Exercisehelpscalmyournervoussystemandtendstoreducetheintensityofphysicalmanifestations表现形式ofstresssuchasrestlessness.A.Stopthenegativethoughts.B.Putyourideaintopractice.C.Whenfacedwithanintervieweryoumaybenervous.D.Beforeyouwalkintoyourinterviewtakeafewdeepbreaths.E.You'retryingtoproveyou'retheoneforthejobandthatyoucanhandlestressfulsituations.F.Don'tforgetthatyou'renottheonlyonebeinginterviewed﹣you'realsointerviewingtheorganization.G.Thiswillstrengthenyouranswersandallowyoutoshowhowyourexperienceisrelevanttothejobororganizationforwhichyou'reinterviewing.
用伏安法测电阻时某电表的示数如图所示其示数为
Fewwouldarguethattherehasnotbeensignificanttechnologicalprogressinthefieldofself﹣drivingcarsinrecentyears.Asidefromthetechnologyquestionthelegislativeissuegivestheworldaworseheadache.Thecontentofthetroublecentresonthequestionofwhoistoblameinacrash.Thelegalfieldtendstohavetheownerstakeresponsibilityforthemessestheircoldlifelessmachinemakesforwhichcaseanexplosionoflawsuitsarewellexpected.Todaymanyofthecarmanufacturersandtheirsuppliersareresearchingself﹣drivingtechnologybutitisunclearwhytheywouldwanttorollitoutquickly.AconsumerinAmericaforexampleuseshisorhercarforapproximatelyonehourperday.Thereisthereforealargeamountoffreecapacityinthepersonalvehicleusemarket.Imagineaworldwhereyoucanbedriventoworkandwhereyourcarcanthenturnaroundanddrivehomesothatyourpartneroranybodyelsecanuseitduringtheday.Thissharedusepatterncouldcertainlystoptheneedtoownasecondcar.Takentoitslogicalconclusionitcouldevenbethebiggestreasontoeliminatetheneedtoownacaratall.Theeffectsoncarsalesvolumescouldbedestructive.Thepossibleviolationofprivacyisalsoabigissueonthemap.Weallknowthatconsumerdataisbigbusiness.Aself﹣drivingcarwouldeasilylogwhereyouvisitedthetimeofthedayyouwentandmuchmore.Thoughyourpurchasepreferencesmightescapesecretpeepingtheleakageofyourwhereaboutsseemsinevitableasit'shardtodowhatyouarealwaysdoingtoyoursmartphonetowardthesoletooloftransportation.Poweroffthebigsteelfellowandyouarestuckontheroad.Thenowexcitedlyexpectingpublicaresuretobeannoyedsoon.Muchdiscussedthepoorapplicationofthetechnologyoutweighsthepreviousfactors.Incarindustrynewvehiclefeaturestakealongtimetogettobroadmarketmass.Featuresaretypicallylaunchedfirstonhigh﹣endvehiclesandthentrickledownoncethereissufficientspaceinthemarkettogeneratethescaleaffordableforthevolumevehicles.Withacarmodel'slifecyclebeingbetweenfiveandsevenyearsitishardtoseeself﹣drivingtechnologybeingfittedasstandardsofthemass﹣marketbrands.Westillhavealongwayofffromaworldofcompletelyself﹣drivingcars.Note:AnswerthequestionsorcompletethestatementsinNOMORETHANEIGHTWORDS.78.Thelikelihoodtotakethecarownersastheguiltypartyintrafficaccidentswillgiveriseto.79.Whatfeatureoftheself﹣drivingcarwouldmainlyaffectcarsales80.Howcanwepreventourpersonaldatafrombeingmonitoredbytheself﹣drivingcar81.Themostseriousproblemfacingtheself﹣drivingcaris.
如图是浙江大学机器人研究团队研发的名为“绝影”的四足机器狗它能稳健地爬陡坡它的出现让我国四足机器人技术达到国际一流水平．机器狗质量为70千克每只脚与地面接触面积为50平方厘米． 1以行走的机器狗为参照物旁边的台阶是选填“静止”或“运动”的． 2机器狗行走时两脚着地它对地面的压强为多少帕 3机器狗爬上3米高的陡坡时克服自身重力做功为多少焦
MauriceMountainisaretiredlawyerinWashingtonD.C.Hedevelopedaprototype原型机foradevicehecallsthePrestoEmergencyBoatLadder.Hisinventionisasmallfoldingladderthatattachestothesideofaboattohelppeoplewhofallintothewater.Mr.Mountainplanstomass﹣producehisboatladder. HecreatedhisinventionataworkshopcalledTechShop.Mr.MountainsaysIthinkitencouragesinnovation.Ithinkpeoplewhoprobablyhavehadideasrollingaroundinthebackoftheirmindsforyearsbuthaveneverhadtheopportunitytoactuallyputthemintoproductionorevenexperimentwiththemwouldfindthisplacewonderful.MembersofTechShopusehigh﹣techequipmenttodevelopandproduceideastheyhaveforinventions.IsabellaMusachiomanagesaTechShopinArlingtonVirginia.Shesaystheshophasmanydifferentkindsofequipment. TechShopisado﹣it﹣yourselfmakerspace.Sowhenyoucomeinwehaveallthesedifferentareasoftheshopandwehaveametalshopwoodshoplasers3Dprinterselectronics.Imeanwehavesomanydifferentareasandwehavealltheequipmentthatisavailahletoanybodyabovetheageof12. MembershipcostsforTechShopstartatjustover$100permonth.Membersareabletousecostlymachinesincluding3Dmodelingtoolsandlasercutters.IsabellaMusachiosaysTechShophelpsitsmembersbuildtheirdreams. Ourmottois‘buildyourdreamshere'becauseyoucanreallycomeinwithjustanideaandthenwiththehelpofTechShopmakethatleapfromanideatobuildingyourprojectoyourprototypeorevenyourbusiness. JimNewtonisthefounderofTechShop.HefirstintroducedtheideaforthetechnologyworkshopsatanartsandscienceseventcalledMakerFaireinSanMateoCaliforniain2006.HisideaattractedhundredsofmembersduringthateventNowthereareeightTechShoplocationsintheU.S.Inalltherearemorethan6000members.Twomore﹣TechShoplocationsinthecitiesofSt.LouisandLookAngeleswillbesetup. 28.TheinventionMr.Mountaininventedwillbeusedto. Asavethedrowningpeople B.helppeopleclimbtheladder C.maketheboatsafer D.lettheboatfloatsafely 29.WhatcanbeinferredfromwhatMr.MountainsaysinParagraph2. A.Peoplewithimaginationcanachievetheirdreams. B.TechShopcanhelpturnsomepeople'sideasintoreality. C.TechShopisaplacewherepeoplecanputforwardtheirnewideas. D.It'shardforpeopletoputtheirideasintopractice. 30.Fromthelastparagraphwecanknow. A.JimNewtonisaverygreatinvention B.peopledidn'tlikeTechShopatfirst C.TechShopwillbecomemoreandmorepopular D.TechShopgreetedwithbadreviewsin2006 31.WhatcanweknowaboutTechShopfromthepassage A.TechShopisfoundedbyMauriceMountain. B.TechShopputshigh﹣techdreamswithinreach. C.TechShopisanon﹣profitorganization. D.TechShopoffersitsmembersmoreideas.
Technologymeansdifferentthingstodifferentpeople.Aphysicianmightthinkoftechnologyasawaytoproduceanewmedicine.Toaspaceengineeritmightmeanmakingbetterrocketengines.Technologyissowidespreadthatitispartofeveryone'slife.OriginallythewordtechnologycomesfromtheGreekwordtechnewhichmeansart.Youmightthinkthatartmeansonlypaintingsorsculpture.ButtheGreeksbelievedanartistcouldmakeusefulproductsfromnaturalmaterialssuchastreesrocksandplants.WhatschoolsubjectsarerelatedtotechnologyThoughpeople'sopinionsvaryonwhatgroupsoftechnologyshouldbebrokendowntoyouwheninschoolmayhavethequestion:WhyshouldyoustudytechnologyThatquestioniseasytoanswer.Technologyisfunrewardingandexciting.Itisfunbecauseyougettoworkwithyourhands.Itisrewardingbecauseyougettoseetheresultsofyourwork.Eachdayitbringsnewideasandnewchallengeswhichmaketechnologyexciting.Studyingtechnologywillalsohelpyoudevelopyourproblem﹣solvingskills.Youcanlearntoidentifyaproblemandcomeupwithasolution.Youwillalsofindthattechnologyisrelatedtoothersubjectsthatyoustudyinschoolsuchas:MathematicsScienceSocialstudiesEnglishlanguageartsArtYoumightenjoyallofyourclassesmoreafteryoubegintoseetherelationshipsbetweentechnologyandothersubjects.DoyouknowwhattechnologicallyliteratemeansTechnologyisofteninthenews.Ajournalistmightreportonaparticularelectricalpowerplantafoodadditiveorasafetydeviceonanautomobile.Itisimportantthatyouunderstandtheimportanceoftechnology.Everydayinmanywaystechnologyaffectsthelivesofpeoplearoundtheworld.Forexampleautomobileairbagshavesavedmanylivesincollisions.Howevertheyinflatesoquicklythattheyhavecausedinjuryanddeathinsomecases.Asaresultthefederalgovernmentallowscarownerstoinstallanon/offswitchfortheairbags.DoyouthinkthegovernmentshouldletpeopledothisToanswerthisquestionyoufirstneedtoknowsomethingaboutthetechnologybeingdiscussed.DoesworkingonasmallenginesounddifficulttoyouWithabasicunderstandingoftechnologyitmightnotbeashardasyouthink.Beingtechnologicallyliteratemeansunderstandingtechnologyandfeelingcomfortablewithit.Sometimesthereisnoonecorrectanswertoaproblem.Youneedtothinkaboutandevaluateeachsituationandthenmakeadecision.Whenyoucandothisyouwillbetechnologicallyliterate.78.Whatcanthetitleofthefirstparagraphbetomatchtheothertwo.79.Youcanhavesincewhenstudyingtechnologyeverydayyouworkwithyourhandsseetheresultsofyourworkandhavenewideasandnewchallenges.80.Whyarecarownersallowedtoswitchofftheirairbags.81.Atechnologicalliteratecanbeapersonwho.Note:AnswerthequestionsorcompletethestatementsinNoMoreThanFifteenWords.
假定你是李华你所喜爱的GlobalMirror周报创刊五周年之际征集读者意见.请你依据以下内容给主编写封信内容主要包括: 1.说明你是该报的忠实读者 2.赞赏该报优点:1兼顾国内外新闻2介绍名人成功故事 3.提出建议:刊登指导英语学习的文章 注意:1.词数100左右开头语已为你写好; 2.可以适当增加细节以使行文连贯. DearEditorinChief Congratulationsonthe5thanniversaryofGlobalMirror! Sincerelyyours. LiHua
某工厂发货传输分拣线示意如图等间距排列的相同货物先被传送带匀速运送到工作台在工作台AB上匀速下滑时被扫描后滑至水平工作台BC最后在C点静止时被机械手臂取走进行分类．传送带与ABAB与BC都平滑连接AB与BC材料相同且长度均为1米空气阻力忽略不计． 1若货物对AB的压力小于对BC的压力则货物在AB上减小的机械能选填“大于”“等于”或“小于”在BC上减小的机械能． 2若机械手臂每隔3秒钟取走一件货物传送带运动的速度为0.8米/秒为防止货物的碰撞与堆积货物之 间的距离d至少为米．
她的父母忙于工作因此她在年幼时就学会了照顾自己.age.
ThisafternoonIspokewithGovernorMalloyandFBIDirectorMueller.IofferedGovernorMalloymycondolences吊唁慰问onbehalfofthenationandmadeitclearthathewillhaveeverysingleresourcethatheneeds33investigatethisheinous令人发指的crimecareforthevictimscomforttheirfamilies. 34enduretoomanyofthesetragediesinthepastfewyears.AndeachtimeIlearnthenewsIreactnotasaPresidentbutasanybodyelsewould﹣asaparent.Andthatwasespeciallytruetoday.Iknowthere'snotaparentinAmericawhodoesn'tfeelthesameoverwhelminggriefthatIdo. Themajorityofthose35diedtodaywerechildren﹣beautifullittlekidsbetweentheagesof5and10yearsold.Theyhadtheirentirelivesaheadofthem﹣birthdaysgraduationsweddingskidsoftheirown.Amongthe36fallwerealsoteachers﹣menandwomenwhodevotedtheirlivesto37helpourchildrenfulfilltheirdreams. Soourheartsarebrokentoday﹣fortheparentsandgrandparentssistersandbrothersoftheselittlechildrenandforthefamiliesoftheadultswho38lose.Ourheartsarebrokenfortheparentsofthesurvivorsaswellforasblessedastheyaretohavetheirchildrenhometonighttheyknowthattheirchildren'sinnocencehasbeentornawayfromthemtooearlyandtherearenowordsthatwilleasetheirpain. Asacountrywehavebeenthroughthistoomanytimes.39it'sanelementaryschoolinNewtownorashoppingmallinOregonoratempleinWisconsinoramovietheaterinAuroraorastreetcornerinChicago﹣theseneighborhoodsareourneighborhoodsandthesechildrenareourchildren.Andwe'regoingtohavetocometogetherandtakemeaningfulactiontopreventmoretragedies40thisregardlessofthepolitics.
如图是上肢力量健身器示意图杠杆AB可绕O点在竖直平面内转动AB＝3BO配重的重力为120牛重力为500牛的健身者通过细绳在B点施加竖直向下的拉力为F1时杠杆在水平位置平衡配重对地面的压力为85牛在B点施加竖直向下的拉力为F2时杠杆仍在水平位置平衡配重对地面的压力为60牛．已知F1F2＝23杠杆AB和细绳的质量及所有摩擦均忽略不计下列说法正确的是
Anewreportsaidmiddleclassworkerscouldstillbeworking1theyareattheageof70tohelpouttheirgrownupchildren. Middleclassworkers2age50andabovearebeingforcedtodelaytheirretirementwithmanyblamingtheirchildrenareportrevealedyesterday. Tomanymiddleclassworkers3botheredthemfromworkcouldn'tcomparewiththepossibilitythattheymightpostponetheirretirementdatebyaroundfiveyears. Itisnotjusttherisingcostoflivingthatiscausingthedelay.Manypointedtothefactthattheyareconstantlyhavingtoprovidefortheirgrown﹣upchildrenatanage4theyassumedtheyshouldbefinanciallyindependent. Actuallyoneinfivemiddleclassworkers5keepworkinginordertosupporttheirchildren.Manyworkersstruggledallalongtotheretirementdateonly6realizethattheyhadtoswitchtoapart﹣timeworkingpatternalsocalledsemi﹣retirement.Rarely7peoplehearoftheconceptofsemi﹣retirementinthepastbutnowsemi﹣retirementhasbecometheroutineamongwealthierpeopleintheir50sand60sregardedas8signofthecountry'son﹣goingworseningeconomy.
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