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如图所示，斜面长20m、高10m，固定在水平地面上．一位同学用平行于斜面向上40N的拉力，在20s内把重60N的物体沿斜面向上匀速拉动了10m．在此过程中（ ） A．斜面的机械效率是66.7%...
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如图所示足够长的倾角θ=37°的光滑斜面体固定在水平地面上一根轻绳跨过定滑轮一端与质量为ml=1kg
斜面长10m高6m固定在水平地面上质量为10kg的物体在斜面底部受一个沿斜面向上的力作用由静止开始运
足够长的倾角θ=53°的斜面固定在水平地面上一物体以v0=6.4m/s的初速度从斜面底端向上滑行该物
足够长的倾角θ＝53°的斜面固定在水平地面上一物体以v0＝6.4m/s的初速度从斜面底端向上滑行该物
钢球沿20m长的斜面滚下又在水平地面上滚动25m后才停止．钢球在斜面和地面上滚动的时间分别是5s和
如图所示一质量为m的小物体可视为质点从高为h的斜面上端滑到斜面底端斜面固定在水平地面上此过程中重力对
如图所示一质量为m的小物体可视为质点从高为h的斜面上端滑到斜面底端斜面固定在水平地面上重力加速度为g
如图所示一质量为m的物体在沿斜面向上的外力作用下静止在质量为M.的斜面体上斜面体静止在水平地面上则
水平地面对斜面体的摩擦力水平向右
水平地面对斜面体无摩擦力
水平地面对斜面体的支持力小于（M+m）g
水平地面对斜面体的作用力方向竖直向上
倾角θ=370的斜面体固定在水平地面上一根轻绳跨过固定在斜面顶端的定滑轮绳的一端与质量为ml=1kg
如图所示倾角为θ=37°足够长的斜面体固定在水平地面上小木块在沿斜面向上的恒定外力F.作用下从斜面上
有一足够长的倾角θ=53°的斜面固定在水平地面上一质量为0.5Kg的物体以v0=6.4m/s的初速度
如图所示一质量为m的小物体可视为质点从高为h的斜面上端滑到斜面底端斜面固定在水平地面上重力加速度为g
足够长的倾角θ=53°的斜面固定在水平地面上一物体以v0=6.4m/s的初速度从斜面底端向上滑行该物
斜面长10m高6m固定在水平地面上质量为10kg的物体在斜面底部受一个沿斜面向上的力作用由静止开始运
质量均为m的物体A.和B.分别系在一根不计质量的细绳两端绳子跨过固定在倾角为30°的斜面顶端的定滑轮
质量均为m的物体A.和B.分别系在一根不计质量的细绳两端绳子跨过固定在倾角为30°的斜面顶端的定滑轮
质量均为m的物体A.和B.分别系在一根不计质量的细绳两端绳子跨过固定在倾角为30°的斜面顶端的定滑轮
斜面固定在水平地面上倾角θ=53°斜面足够长物体与斜面间的动摩擦因数μ=0.8如图所示.一物体以v0
钢球沿20m长的斜面滚下后又在水平地面上滚动25m距离才停止.钢球在斜面和地面上滚动时间分别是5s和
如图所示AB是高h1=0.6m倾角θ=37º的斜面固定在水平桌面上斜面下端是与桌面相切的一小段圆弧且
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8分RobotSurgeon外科医生SucceedswithoutHelpfromHumanDoctors Humansmakemistakes.Evensurgeonswithyearsofexperiencearenotinfallible.Butwhatifthesedoctorscouldpooltheirknowledgeandexperiencetogetherandcreateasurgicalstandardofcaretobecarriedoutbymachines That'stheideabehindsurgicalrobotswhichmaysoonperformmostsurgeriesfromsewinguptinywoundstoperformingheartprocedures.Manyoftheseoperationsareinfactalreadycompletedwiththeassistanceofrobots.Butarecenttestsuggeststhatrobotsintheoperatingroommaysoongoastepfurtherperformingonsofttissuecompletelyontheirownfromstarttofinish. TheSmartTissueAutonomousRobotSTARsuccessfullycompletedsurgeriesonpigs.We'rethefirstgrouptodevelopautonomousroboticsurgerywithsoft﹣tissuesurgeryandwhencomparedtostandardoperationit'sbettersaysPeterKimprofessorofsurgery.Theideaisnottoreplacesurgeonsitwillmakethesurgeonsbetterandmaketheproceduressafer. ArecentMayoClinicstudyfoundthatmajorsurgicalerrors﹣includingoperatingonthewrongsiteorsideofthebodyorevenleavingtoolsorobjectsinsidethepatient﹣occureveryoneoutof22000procedures.That'srarebutrobotslikeSTARwouldaimtolowerthenumberevenfurther. InthedaVincisurgicalsystemsurgeonsplacetheirarmsinsideinstrumentsandusetheirhandstocontrolthemovementofrobotictoolsontheoperatingtablefromafar.Therobot'severymajormoveiscontrolledbysurgeonsandthusitsresultsmayvarybasedonthesurgeon'strainingorexperience. STARontheotherhandisentirelyautonomous.It'snotonlyabletoworkonitsownandperformsurgerieswithamoreflexiblehandbutit'sabletoreacttotheunexpectedincidents.Cuttingintohardtissuelikebonesisonethingbutoperatingonmovingsofttissueisfarmorecomplex.STARreactstoachangingenvironmentsimilartohowself﹣drivingcarsareprogrammedtonotonlydriveonthehighwaybutalsoreacttoanotherdrivermakingamistakeandgettinginyourway. 63.TheunderlinedwordinfallibleinParagraph1probablymeans. A.alwaysright B.reallycreative C.ratherresponsible D.quitesmart 64.WecanlearnfromthepassagethatSTAR. A.hasbeenwidelyusedintheoperatingroom B.canperformtheoperationonitsown C.canmakesurgeriesmuchfaster D.willtaketheplaceofsurgeons 65.InthedaVincisurgicalsystem. A.robotsaretrainedfromafar B.surgeryresultsdependonsurgeons C.robotsalwaysmakemistakes D.surgeonshavetroublecontrollingrobots 66.Inthelastparagraphtheauthormentionsself﹣drivingcarsinordertoshow. A.howbadgettinginanotherdriver'swaymightbe B.howdifficultself﹣drivingonthehighwayis C.howsmartanautonomousrobotcanbe D.howdangerousoperatingonpeopleis.
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阅读理解 已知两点Mx1y1Nx2y2则线段MN的中点Kxy的坐标公式为x＝y＝． 如图已知点O为坐标原点点A﹣30⊙O经过点A点B为弦PA的中点．若点Pab则有ab满足等式a2+b2＝9． 设Bmn则mn满足的等式是
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6分EmbassySuitesbyHiltonSantaAnaOrangeCountyAirport NeighborhoodJohnWayneAirportSNAOrangeCounty 1325EastDyerRoadSantaAnaCA OVERALLGUESTSCORE VeryGood Basedon163GuestRatings FreeBreakfastFreeAirportShuttle FitnessCenterBusinessCenter HotelDescription BeingclosetoairportandfreewayaccessmakestheEmbassySuitesatopchoiceforourguestsinthearea.The300﹣roomEmbassySuitesoffershomeycomfortsforthoseonbusinessandvacationalike﹣suiteswithseparatelivingandsleepingareasrefrigeratorsmicrowavescoffeemakersWi﹣FiaccessandtwoTVs.Wakeuptoafreecooked﹣to﹣orderbreakfastandenjoytheindoorpoolandfitnesscenter.Atwo﹣houreveningreceptionoffersdrinksandappetizersandtheon﹣siterestaurantservesAmericanfavorites.Thepropertyalsohasabusinesscenterwithcopyandfaxservices.Parkingisavailableforanadditionalfee.LessthantwomilesfromI﹣405theEmbassySuitesiswithinahalf﹣mileofvariousrestaurantsandjustthreemilesfromJohnWayneAirport.OurguestssaytheEmbassySuites'locationbrilliantbreakfastandfriendlystaffmakeitoneoftheirfavoriteSantaAnaproperties. 56.makestheEmbassySuitesatopchoiceforitsguestsinthearea. A.Theconvenientlocation B.Thefriendlystaff C.Thebusinesscenter D.Wi﹣Fiaccess 57.Accordingtotheguestratingsalltheguestsaresatisfiedwithits. A.heatingsystem B.accommodations C.breakfast D.parkingfee 58.Thisadvertisementismademorebelievableby. A.interviewingtheguests B.usingguests'comments C.analyzingitsprosandcons D.providingtheexactaddress.
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如图已知a∥b∠1＝58°则∠2的大小是
10分短文改错 假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及二个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1每处错误及其修改均仅限一词 2只允许修改10处多者从第11处起不计分. Smartphoneshadbecomepartofourdailylife.Nomatterwhowearewecanseepeoplebusyplaywiththeirsmartphones.Smartphonesarebenefittous.Theyhelpusescapethepressuresoflifeorgetinformation.Thereforeifwespendtoomuchtimeonthemwewon'thavetimecontactfacetofaceourfriendsandfamily.Andourlifestudyandworkwillbehurt.Inmyviewweshouldlimittoourusingsmartphonesexceptforapurposeoflearning.Meanwhileit'sabsolutenecessaryforustotakepartinmoreoutdooractivities.
方程＝1的解是
如图菱形ABCD中作BE⊥ADCF⊥AB分别交ADAB的延长线于点EF． 1求证AE＝BF 2若点E恰好是AD的中点AB＝2求BD的值．
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不等式组的解集是
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8分Itdoesn'tmatterifbooksaredeliveredinprintorbysmartphoneandthemainthingistogetlostinreadingthem. WhyshouldwebotherreadingabookAllchildrensaythisoccasionally.Manyadultswithreadingdifficultiesrepeatittothemselvesdaily.Inaworldofacceleratingtechnologyincreasingtimepovertyanddecreasingattentionlengthsshouldtheydevoteprecioustimesinkingintoagoodbook Thediscoveryisthatanextraordinarybookhasatransformativeeffectonthewayweviewtheworld.Thistransformationonlytakesplacewhenweloseourselvesinabookabandoningtheemotionalandmentalchatoftherealworld.That'swhystudieshavefounddeepreadingmakesusmoreattentivetotheinnerlivesofothers. Weknowreadingisthefoundationstoneofalleducationandanessentialstrengthoftheknowledgeeconomy.Butperhapsevenmoresignificantisitsemotionalroleasthestartingpointforindividualdevelopmentandpleasure.Bookscanopenupemotionalimaginativeandhistoricalviewsthatequalandextendthecorridors通道oftheweb. Ifreadingweretodeclinesignificantlyitwouldchangetheverynatureofourspecies.Ifweinthefuturearenolongerwiredforourownreflectionandcreativethoughtwewillbeweaker.Howevertechnologythrowsupsolutionsasmanyaschallengesforeverydooritclosesanotheropens.Sotheabilityofferedbyequipmentslikee﹣readerssmartphonesandtabletstocarryanentirelibraryinyourhandisanamazingopportunity.Weshouldconcentrateonthemessagenotworriedaboutthemedium. Wemustalsogetbetteratcontrollingtheabilityoftheinternettoinformreadersandpotentialreadersaboutallthenewbooksthatarepublishedeveryyearandtorenewtheiracquaintancewiththebestofrichliterarytradition.Ifwestopreadingwewillbedifferentpeoplelesscomplexlessinteresting.Therecanhardlybeabetterreasonforfightingtoprotectthefutureofthebook. 32.Whydoesdeepreadingmakeusmoreattentivetotheinnerlivesofothers A.Becausewehavevarietiesofresourcesofreading. B.Becauseweareinaworldofacceleratingtechnology. C.Becauseitwillweakentheverynatureofhumanbeings. D.Becauseanextraordinarybookmakesouroutlookbrighter. 33.Accordingtothetexttheauthorthinks. A.readingontheinternetismoreimportantandconvenientthanbooks B.weshouldfocusonthemeansofgaininginformationratherthanthecontent C.withthehelpoftheinternetpeoplecanaccessthebestofrichliterarytradition D.thewebisbetteratshapingemotionalimaginativeandhistoricalviewsthanbooks 34.Theunderlinedwordtabletsisclosesttoinmeaning. A﹣Pills B.pads C.forms D.desks. 35.Whatistheauthor'sattitudetowardsreading A.Critical. B.Objective. C.Indifferent. D.Approving.
已知抛物线y＝mx2和直线y＝﹣x+b都经过点M﹣24点O为坐标原点点P为抛物线上的动点直线y＝﹣x+b与x轴y轴分别交于AB两点． 1求mb的值 2当△PAM是以AM为底边的等腰三角形时求点P的坐标 3满足2的条件时求sin∠BOP的值．
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若式子在实数范围内有意义则x的取值范围是．
30分第一节完形填空 UsingpublictoiletsinChinacanoftenbeachallengingundertakingparticularlyforthosenotpracticedintheartofsittingdeep.41researchersinChinahavecomeupwithanew42thattheysaycanhelp43apoisonousproblembotheringChina'spublictoiletstheoverpoweringodor恶臭. Unlikechemicalsolutions44areexpensiveandcan45theenvironmentthenewbiotreatmentisbeingthoughtasacost﹣effectivewayofprotectingtheenvironmentto4675percentofthebadsmellinbathroomsaccordingtoresearchersfromtheChineseAcademyofSciences.The47behindthetreatmentliesinaspecial48oftwotypesofbacteria﹣﹣﹣lactobacilliussp乳杆菌类细菌andstreptococcusthermopiles嗜热链球菌﹣﹣﹣aswellastheelementsoforanges.Thepreparedmixturewhichcomesinliquidorpowderformfeedsonhumanwastewhenappliedthus49thegrowthofodor﹣makingbacteria.Howevernotyetavailablein50theodor﹣killingtechnologyisstillundergoing51.Manyexperimentswiththesolutionarebeing52intheHuanglongNaturePreserveandJiuzhaigouNationalPark. Wecanseethetechnologyisespeciallysuitedforuseinthenonflushing非冲水toiletsoftenfoundinthesetypesofnaturepreservessincewaterregulationsintheseareasareoftenvery53andpipesaredifficultto54.Portablebathroomswhile55arerelativelyexpensivetomaintaincomparedwiththebiosolution. Thisway56canseethatnotonlyareyour57nicebutthetoiletsandtheotherfacilitiesatthesitearepleasantaswellandthetechnologyhasother58aswellsuchasthetreatmentofrubbishsaidtheadministratorofJiuzhaigouNationalPark. If59toitseffectivenessprovetruethetechnologyislikelytobe60bytheChinesehealthauthorities. 41.A.Because B.If C.But D.While 42.A.technology B.way C.machine D.psychology 43.A.confirm B.analyze C.findout D.dealwith 44.A.which B.they C.that D.those 45.A.benefit B.protect C.harm D.influence 46.A.leadto B.takein C.keepout D.makeuseof 47.A.identity B.science C.instruction D.procedure 48.A.seed B.poison C.mixture D.discovery 49.A.preventing B.keeping C.causing D.forbidding 50.A.gardens B.forests C.homes D.supermarkets 51.A.discussing B.using C.testing D.analyzing 52.A.planned B.simplified C.classified D.debated 53.A.strict B.harmonious C.drafted D.canceled 54.A.polish B.twist C.make D.fix 55.A.optional B.clean C.superb D.convenient 56.A.lawyers B.tourists C.burglars D.merchants 57.A.goods B.animals C.mountains D.guides 58.A.phenomena B.disadvantages C.applications D.characteristics 59.A.results B.guesses C.doubts D.claims 60.A.accepted B.refused C.abandoned D.banned
6分DearGod NowthatIamnolongeryoungIhavefriendswhosemothershavepassedaway.Ihaveheardthesesonsanddaughterssaytheyneverfullyappreciatedtheirmothersuntilitwastoolatetotellthem. Iamblessedwiththedearmotherwhoisstillalive.Iappreciatehermoreeachday.MymotherdoesnotchangebutIdo.AsIgrowolderandwiserIrealizewhatanextraordinarypersonsheis.HowsadthatImunabletospeakthesewordsinherpresencebuttheyfloweasilyfrommypen. HowdoesadaughterbegintothankhermotherforlifeitselfForthelovepatienceandjusthardworkthatgointoraisingachildForrunningafteratoddlerforunderstandingamoodyteenagerfortoleratingacollegestudentwhoknowseverythingForwaitingforthedaywhenadaughterrealizeshowwisehermotherreallyis HowdoesagrownwomanthankamotherforcontinuingtobeamotherForbeingreadywithadvicewhenaskedorremainingsilentwhenitismostappreciatedFornotsayingItoldyousowhenshecouldhaveutteredthesewordsdozensoftimesForbeingessentiallyherself﹣﹣lovingthoughtfulpatientandforgiving Idon'tknowhowdearGodexcepttoblessherasrichlyasshedeservesandtohelpmeliveuptotheexampleshehasset.IpraythatIwilllookasgoodintheeyesofmychildrenasmymotherlooksinmine. 25.Theauthorpreferstoshowappreciationtohermother. A.totellhermotherfacetoface B.tomakeacall C.nevertotellhermother D.towriteitout 26.Accordingtothelastparagraphtheauthortendsto. A.followhermother'sexample B.prayforfriends'mother C.askGodmorequestions D.showlovetohermother 27.Whatistheauthor'spurposeofwritingthepassage A.Totellushowtoraiseachild. B.Tomemorizeherfriends'mothers. C.Tothankhermotherandbeagoodmother. D.Toexpectsomethingspecialfromherchildren.
10分SocialPhobia It'snaturaltofeelnervousorshyinfrontofothersattimes.Mostpeoplemanagetogetthroughthesemomentswhentheyneedto.71It'sprobablymorethanshyness.Itmaybuildupintoapowerfulfear.Asaresultpeoplefeeluncomfortableparticipatingineverydaysocialactivities.Thisiscalledsocialphobiaalsocalledsocialanxiety. 72Itpreventsthemfromchattingwithfriendsinthelunchroomjoininganafter﹣schoolcluborgoingtoaparty.Sometimestheyevenfeeltoonervoustoaskaquestioninclassorgotoateacherforhelp.Socialphobianotonlypreventspeoplefromtryingnewthings.Italsopreventsthemfrommakingthenormaleverydaymistakesthathelppeopleimprovetheirskillsstillfurther. Itisreallysadisn'titButthegoodnewsisthatpeoplewithsocialphobiacanlearntomanagefeardevelopconfidenceandcommunicatingskillsandstopavoidingthingsthatmakethemnervous.Ofcourseit'snotalwayseasy.Dealingwithsocialphobiatakespatiencecouragetofacefearsandthewillingnesstopractice.73 Therapists治疗师canhelppeoplecreateaplanforfacingsocialfearsandbuildtheskillsandconfidencetoovercomeit.Andfamilyorfriendsareespeciallyimportantforthem.74Friendsandfamilycanencouragethemtopickasmallgoaltoaimforremindthemtogoforitandbetherewhentheymightfeeldiscouraged.Goodfriendsandfamilyaretheretocelebrateeachsmallsuccessalongtheway. Littlebylittlesomeonewhodecidestodealwithextremeshynesscanlearntobemorecomfortable.75Asshynessandfearsbegintomeltconfidenceandpositivefeelingsbuild.Prettysoonthepersonisthinkinglessaboutwhatmightfeeluncomfortableandmoreaboutwhatmightbefun. A.Friendscanovercometheirfears. B.Butforsometheanxietycanbeextreme. C.Theyarenotabletomakeeyecontactwithclassmates. D.Socialphobiamakespeoplelonelyordisappointedovermissedopportunities. E.Italsotakesacommitmenttogoforwardratherthanbackawaywhenfeelingshy. F.Eachsmallstepforwardhelpsbuildenoughconfidencetotakethenextsmallstep. G.Thesupportfromthosekeypeoplehelpsthemgatherthecouragetotrysomethingnew.
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如图1在平面直角坐标系中抛物线y＝x2+x﹣与x轴交于点AB点A在点B右侧点D为抛物线的顶点点C在y轴的正半轴上CD交x轴于点F△CAD绕点C顺时针旋转得到△CFE点A恰好旋转到点F连接BE． 1求点ABD的坐标 2求证四边形BFCE是平行四边形 3如图2过顶点D作DD1⊥x轴于点D1点P是抛物线上一动点过点P作PM⊥x轴点M为垂足使得△PAM与△DD1A相似不含全等． ①求出一个满足以上条件的点P的横坐标 ②直接回答这样的点P共有几个
求式子÷的值其中m＝﹣2019．
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