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如图，在⊙O中，CD为⊙O的直径，点A为弧BC的中点，AF⊥CD，垂足为F，射线AF交CB于点E． （1）如图（1），求证：EA＝EC． （2）如图（2），连接EO并延长交AC于点G，求证：2F...
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问题背景:如图a点A.B.在直线l的同侧要在直线l上找一点C.使AC与BC的距离之和最小我们可以作出
如图圆O.的直径为5在圆O.上位于直径AB的异侧有定点C.和动点P.已知BC∶CA＝4∶3点P.在半
如图已知AB为⊙O.的直径F.为⊙O.上一点AC平分∠BAF且交⊙O.于点C.过点C.作CD⊥AF于
如图AC⊥BCAC=BC=4以BC为直径作半圆圆心为O.以点C.为圆心BC为半径作弧AB过点O.作A
如图AB是⊙O.的直径C.P.是弧AB上两点AB＝13AC＝51如图1若点P.是弧AB的中点求PA的
如图a点A.B.在直线l的同侧要在直线l上找一点C.使AC与BC的距离之和最小我们可以作出点B.关于
如图AB是⊙O.的直径AB=8点M.在⊙O.上∠MAB=20°N.是弧MB的中点P.是直径AB上的一
4
5
6
7
已知如图在△ABC中AB=AC点D.是边BC的中点.以CD为直径作⊙O.交边AC于点P.连接BP交A
如图2AB是⊙O.的直径弦CD⊥AB于G.F.是CG的中点延长AF交⊙O.于E.点CF＝2AF＝3则
如图1Rt△ABC中∠ACB=90°AB=5BC=3点D在边AB的延长线上BD=3过点D作DE⊥AB
已知⊙O中弦AB⊥弦CD于Etan∠ACD=1如图1若AB为⊙O的直径BE=8求AC的长2如图2若A
如图AB为⊙O.的直径点C.为⊙O.上一点将弧BC沿直线BC翻折使弧BC的中点D.恰好与圆心O.重合
如图△ABC中∠ACB=90°D.为AB上一点以CD为直径的圆O.交BC于点E.连接AE交CD于点P
如图已知⊙O.的半径为2AB为直径CD为弦AB与CD交于点M.将弧CD沿着CD翻折后点A.与圆心O.
如图在△ABC中AB＝AC以AB为直径的半圆O.交BC于点D.DE⊥AC垂足为E.1求证点D.是BC
如图AB为⊙O.的直径F.为弦AC的中点连接OF并延长交弧AC于点D.过点D.作⊙O.的切线交BA的
如图圆O的直径为5在圆O上位于直径AB的异侧有定点C和动点P已知BCCA=43点P在半圆弧AB上运动
如图在边长为2的正方形ABCD中E.F.O.分别是ABCDAD的中点以O.为圆心以OE为半径画弧EF
如图所示AB是⊙O的直径点C为⊙O上一点过点B作BD⊥CD垂足为D连接BCBC平分∠ABD.求证CD
已知如图在△ABC中BC=AC=6以BC为直径的⊙O.与边AB相交于点D.DE⊥AC垂足为点E.1求
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DeltaCollegestartsStreetFair SanJoaquinDeltaCollegewillintroduceitsnewSummerStreetFairwhichrunsfromnoonto8p.meveryFridaystatingthisweekthroughAug.9inDelta'sL﹣lparkinglotnearPacificAvenueandMarchLane.ThefairgoeswithDelta'sweekendfleamarket. Thisweek'sfeaturedperformersareguitaristTravisMatsumotofromnoonto3p.m.andJulioandhisJazzTriofrom3to6p.m. LodeFarmersMarketopens TheAngelsCampCertifiedFarmersMarketbeginsitsyearlyrunfrom5p.m.toduskthisFridayinUticaParkindowntownAngelsCamp.Openingnightwillfeaturewinetastingfromaward﹣winningFourWindsCellarsandlivemusicbyguitaristNicholasLeffler.Visitorswillfindfreshlocallygrownproduceandspecialtyfoods.TherewillalsobebarbecueandCalifornia. Mexicanfusioncuisine. JoinRiverRaftingforagoodcause WhitewaterenthusiastscanparticipateinMokelumneRiveRaftingAdventuresonJune16inMokelumneHill.LocaloutfitterO.A.R.S.isdonatingitsservicestohelpwiththeevent.Departuresareat8a.m.noonor4p.m.Thetripshouldlastaboutthreehours. Thetripisappropriateforthose7andolderandtheabilitytoswimisnotrequired.Thecostis70perperson. Filmscenteronpaddlingwater Thefestivalisanannualcontestthatawardswinningfilmsthatfocusonpaddlinginriverslakesandoceansinavarietyoflocales.Ticketstothefilmfestivalare12inadvanceand$15atthedoorandarealsoavailableonlineatticketriver.com/event/7002﹣reel﹣paddling﹣film﹣festival. Theeveningalsoincludesadrawing.PrizesincludewhitewatertripsontheSouthForkoftheAmericanRiver. 1IfyouwanttogototheSummerStreetFair. A.youmustbeastudentfromDeltaCollege B.youcangothereontheafternoonofFriday C.youshouldlivenearthePacificAvenue D.youmustgiveaperformanceinthemarket 2Ifyouwanttoenjoythetastyfoodsyoucangoto. A.thenewSummerStreetFairofDeltaCollege B.LodeFarmersMarket C.MokelumneRiverRaftingAdventures D.thefilmfestivalcenteringonpaddlingwater 3Ifyouareinterestedinpaddlinginrivers. A.youcanknowalltheAmericanrivers B.youmusttryhardtogetmanyprizes C.youcangetticketsfromawebsite D.youmustkeepsilentintheevening.
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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.
必须清楚地意识到自己的长处和短处之后才能合理地制定人生目标无怨无悔地为之奋斗.before.
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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