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如图所示，乒乓球漂浮在水面上，请画出乒乓球受力的示意图．
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如图所示乒乓球漂浮在水面上请画出乒乓球受到的重力G和浮力F浮的示意图．
如图所示小明把一个乒乓球丢入水中乒乓球会漂浮在水面上请画出乒乓球在水中静止时受力的示意图．
如图14所示乒乓球漂浮在水面上请画出乒乓球受力的示意图
如图所示乒乓球漂浮在水面上请画出乒乓球受力的示意图．
如图所示乒乓球漂浮在水面上请画出乒乓球受到浮力的示意图．
1如图乒乓球漂浮在水面上请画出乒乓球受到的重力G.和浮力F.浮的示意图.2在图中画出悬挂着的吊灯的受
如图所示乒乓球漂浮在水面上请画出乒乓球受力的示意图．
如图所示装有水和乒乓球的烧杯静止在斜面上请在该图中画出乒乓球受力的示意图
如图所示一个乒乓球在水中加速上升请画出乒乓球所受力的示意图
如图所示乒乓球漂浮在水面上请画出乒乓球受力的示意图．
如图所示乒乓球漂浮在水面上请画出乒乓球受力的示意图.
如图所示乒乓球漂浮在水面上请画出乒乓球受到的重力G.和浮力F.浮的示意图.
如图所示装有水和乒乓球的烧杯静止在斜面上请在该图中画出乒乓球受力的示意图
如图11所示乒乓球漂浮在水面上请画出乒乓球受力的示意图．
按照题目要求作图1如图甲请作出物体AB在平面镜中所成的像A.′B.′.2图乙中乒乓球漂浮在水面上画出
如图所示乒乓球漂浮在水面上请画出乒乓球受力的示意图．
如图所示乒乓球漂浮在水面上请画出乒乓球受力的示意图.
如图所示乒乓球漂浮在水面上请画出乒乓球受力的示意图.
按要求作图1物体M是静止在一水平匀速行驶的车厢里的一木箱.如图所示请作出M.所受力的示意图.2如图所
如图所示一乒乓球漂浮在水面上在如图中画出乒乓球受力的示意图．
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某同学用溶质质量分数为6%的氯化钠溶液密度约为1.04g/cm3配制50g溶质质量分数为3%的氯化钠溶液． 1配制该溶液需要6%的氯化钠溶液准确到0.1mL． 2若量取氯化钠溶液时仰视读数则会导致所配制溶液的质量分数填“＞““＜”或“＝”3%．
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在“宏观﹣﹣微观﹣﹣符号”之间建立联系是化学学科特有的思维方式．如图是某反应的微观示意图下列说法正确的是
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Coffeeshopsarecool.HoweverinWilmingtonNorthCarolinaBitty&Beau'sCoffeeisknownforits1. Attheheartoftheshop'spopularityisits2staffalmosteveryonewhoworkstherehasan3ordevelopmentaldisabilityrangingfromDownsyndrome唐氏综合征toautism自闭症tocerebralpalsy脑瘫.Formanyemployeesit'stheirfirstjobandtheir4fillstheair. It'sthevisionofWilmingtoncitizenAmyWright5bytwoofherfourchildren﹣BeauandBittywhohaveDownsyndrome. WhenWrightandherhusbanddiscoveredthatnearly70%ofadultswiththosedisabilitiesdonothave6theyweredeterminedtodosomethingaboutit. It7melikeaflashoflightningacoffeeshop!Wrightsaid.Irealizeditwouldbethe8environmentforbringingpeopletogether.Seeingthestafftakingorders9coffee﹣they'drealizehow10theyare. TheshopopenedinJanuary2016and11hadlinesoutthedoor.Nationalpressattention12andsixmonthslaterithadtomovetoa13space. TodaytheWilmingtonstore1440peoplewithdisabilitiesaswellastwomanagerswhohavedegreesinspecial15.Theteamworkslikeawell﹣oiled16. Ourwaitingtimeisnolongerthananyofour17Wrightsaid.They'veallgottenreallygoodattheirjobsandstep18ifsomebodyelseneedshelp. Allthe19fromthecoffeeshopgotoWright'snonprofitAbletoWorkUSA.Butshe'smost20ofthebridgesit'sbuiltinthecommunity. 1A.taste B.price C.warmth D.management 2A.nursing B.qualified C.senior D.unique 3A.intellectual B.visual C.physical D.emotional 4A.fear B.surprise C.joy D.love 5A.admired B.inspired C.cheered D.persuaded 6A.friends B.cures C.jobs D.chances 7A.struck B.awoke C.scared D.convinced 8A.familiar B.perfect C.clean D.commercial 9A.pouring B.consuming C.acquiring D.serving 10A.hardworking B.gifted C.admirable D.capable 11A.immediately B.unusually C.apparently D.fortunately 12A.shifted B.followed C.continued D.counted 13A.nearer B.larger C.cooler D.greener 14A.assists B.attracts C.represents D.employs 15A.profession B.administration C.education D.condition 16A.machine B.tool C.device D.computer 17A.agents B.neighbors C.customers D.competitors 18A.in B.up C.aside D.down 19A.profits B.facilities C.donations D.employees 20A.typical B.certain C.proud D.worthy
空气中体积分数最大的气体化合物是地壳中含量最多的金属元素与氯元素所形成化合物的化学式为．
AnumberofAmericanspredictthatdriverlesscarswillrevolutionizetheformoftravellingincitiesandhighways.HoweverexperimentshaveshownthatautonomousvehiclesalsohavethepotentialtoimprovethequalityoflifeformillionsofAmericansespeciallytheelderlyanddisabledsolongasthegovernmentandlawmakerscarryoutsmartpoliciesthatpavethewayforinnovation. AretirementcommunityinAlabamawhichhasbeentransformedbyasmallgroupofdriverlesstaxisshowsthepotentialofself﹣drivingcarstochangepeople'slivesinAmerica.AlthoughthemodifiedFordFusionsarecurrentlylimitedtoatwo﹣mileroadresidentsarealreadyhavingthebenefitsoftheseautonomousvehicleswhichallowthemtotakepartinsocialactivitieswhichwouldotherwisebeunabletoenjoysimplybecausetheycouldnotgettothem. Whentheexperimentalrunfinallyreaches15milesofroadtheseresidentswhoseaverageageis77willalsohaveaconvenientandreliablewaytokeeptheirappointments.BecausethesecarscontinuetoserveresidentsthereitisnotdifficulttounderstandwhyCaliforniaisgraduallysimplifyingregulationsforthebusiness. InNewJerseyahead﹣thinkingpolicieshavethepotentialtounlockotherhiddenbenefitsofautonomousvehicleespeciallyforthosewithphysicaldisabilities.TheNewJerseyDisabilityRightsCoalitionhasstronglyadvocatedforthedevelopmentofthistechnologysayingthatitcouldgivepeoplewithdisabilitiesgreateropportunitiesintheworkforceandenablethemtoleadmoresatisfyingandindependentlives. ManyAmericansadmitthatautonomousvehicleswillbethefutureoftransportationbutitistoooftenoverlookedthatthisfuturecannotarrivefastenoughformillionsofAmericanswhoareforcedtodependonothersforday﹣to﹣daytravel.ThepolicymakersshouldfollowtheleadofplaceslikeCaliforniaandNewJerseyandpassregulationstounlockthesehiddenbenefitsofdriverlesscars. 1WhatistheattitudeofmostAmericanstothefutureofautonomousvehicles A.Uncertain. B.Doubtful. C.Indifferent. D.Optimistic. 2WhatdoesFordFusioninParagraph2referto A.Thecollectionofsocialactivities. B.Thenameofaretirementcommunity. C.Atypeofautonomousvehicle. D.Atwo﹣mileroadforself﹣drivingcars. 3WhatdotheexamplesinCaliforniaandNewJerseyshow A.Theprogressofdriverlesstechnologyisheldback. B.Theuseofdriverlessvehiclesisnotsatisfactoryyet. C.Theagedanddisabledbenefitfromdriverlessvehicles. D.Commonpeoplehavenoaccesstodriverlessvehicles. 4Whatdoestheauthortrytoexpressinthelastparagraph A.Theconceptofautonomousvehicleshasn'tbeenrecognized. B.Theweakgroupsareoverlookeddespitetechnologyadvances. C.Futuredevelopmentofautonomousvehicleslooksdoubtful. D.Regulationsshouldgohandinhandwithdriverlesstechnology.
某项工程甲单独完成要45天乙单独完成要30天若乙先单独做20天剩余的由甲去完成问甲乙一共用几天可全部完成任务
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