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2014年全面施工的龙岩大桥建成后，将超过法国的本艾因大桥成为世界上最重的转体结构大桥，其效果图如图所示．高架桥限60km/h，主桥长340m，引桥总长1449m． （1）若轿车在正桥水平桥面上...
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南浦大桥于年建成通车
备受关注的港珠澳大桥年内开工预计2015年建成大桥将跨越珠江口是连接香港珠海澳门的大型跨海通道图为大
政治因素
自然因素
科技因素
经济因素
阅读资料完成下列要求杭州湾跨海大桥于2008年5月1日正式通车大桥南起宁波慈溪北至嘉兴海盐是世界上建
1957年我们建成了飞架长江南北的第一桥是
武汉长江大桥
南京长江大桥
长江湘江大桥
2014年全面施工的龙岩大桥建成后将超过法国的本艾因大桥成为世界上最重的转体结构大桥其效果图如图甲
截至目前世界上已建成的跨海大桥中最长的是
美国金门大桥
加拿大联邦大桥
中国东海大桥
中国湾大桥
2011年9月28日世界首座三塔两跨悬索桥——长江公路大桥钢箱梁吊装胜利合龙大桥的建设创造了五项世界
崇启
泰州
马鞍山
南溪
2011年12月24日跨越长江连接沪苏被称为长江入海第一桥的▲正式建成通车大桥由于地处长江入海口是所
苏通大桥
东海大桥
沪苏大桥
崇启大桥
长沙三汊矶大桥是2006年建成通车还是2008年建成通车的
杭州湾跨海大桥于2008年5月1日正式通车大桥南起宁波慈溪北至嘉兴海盐下图是世界上建造难度最大的跨海
1957年我们建成了飞架长江南北的第一桥是
武汉长江大桥
南京长江大桥
长江湘江大桥
长沙猴子石大桥是2000年建成通车还是2002年建成通车
舟山跨海大桥于2009年12月25日正式通车大桥建成后使舟山更紧密地融入长三角经济圈大桥设计要求最大
抗台风等级
最大通航等级
工程项目的管理水平
使用年限
1982年建成的哪座桥梁首次根据现代工程控制的基本思想有效地进行了主梁挠度和索塔水平位移的施工控制
武汉长江大桥
上海泖港大桥（主跨200m的斜拉桥）
上海卢浦大桥
杭州湾大桥
阅读图文材料回答问题杭州湾跨海大桥于2008年5月1日正式通车大桥南起宁波慈溪北至嘉兴海盐如图是世界
阅读资料完成下列要求杭州湾跨海大桥于2008年5月1日正式通车大桥南起宁波慈溪北至嘉兴海盐是世界上建
阅读资料完成下列要求杭州湾跨海大桥于2008年5月1日正式通车大桥南起宁波慈溪北至嘉兴海盐是世界上建
阅读资料完成下列要求杭州湾跨海大桥于2008年5月1日正式通车大桥南起宁波慈溪北至嘉兴海盐图6是世界
.阅读资料完成下列要求杭州湾跨海大桥于2008年5月1日正式通车大桥南起宁波慈溪北至嘉兴海盐是世界上
阅读资料完成下列要求杭州湾跨海大桥于2008年5月1日正式通车大桥南起宁波慈溪北至嘉兴海盐上图是世界
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下列物质中只含有分子的是
将一定量的丙烷C3H8和氧气置于一个密闭的容器中引燃并充分反应测得反应前后各物质的质量如表所示下列判断不正确的是
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用所学化学知识解释下列原理 1铵态氮肥为什么不能与碱性物质混合使用 250mL酒精与50mL水混合后从分子角度解释为什么总体积小于100mL
Manysmall﹣businessownerswatchedrecentrevelationsaboutFacebookwithmixedemotions.LikemostAmericanstheyweresurprisedtodiscoverhowmuchinformationthesocialmediagiantcollectedonitsusers.ButwhenitcomestosmallbusinessFacebookisatransformativeadvertisingplatformforsmallbusinessesnoteasytoreplace. Let'ssayyouownasmallseafoodrestaurantandTuesdaynightsare﹩1oyster牡蛎nights.Traditionaladvertisingmethodscostalotandmustbeplannedlonginadvanceandit'shit﹣or﹣missastowhetheryouactuallygetinfrontofoystereaters.WithFacebookonTuesdaymorningwithafewclicksyoucantargetFacebookusersinyourZipcodewholoveoystersandeatingoutandareoverage21sotheycanbuydrinkswhichiswhyyouhave﹩1oysternights.Andyoucandothisforaslittleas﹩20. Inmyworkwithsmallbusinessesformorethan25yearsI'veneverseenamoreeffectivemethodofmicro﹣targetingprospects.ThoughFacebookisaneffectivetoolforsmall﹣businessadvertisingdoesnotjustify证明合理thecompany'scollectingvastamountsofdataorallowingusers'datatobeinvaded. Ourprimaryconcernwaspeople'sexperienceonFacebooksaidDanLevyFacebook'sVicePresidentSmallBusiness.Ourteamshavealsobeenspeakingtosmallbusinessesandtheywanttomakesurewe'readdressingthesituationandweare. OneconcernsmallbusinesseswantFacebooktoaddressisprotectingtheiruploadedlists.Noonewantstheircustomers'informationmisusedoraccessedbyothersespeciallycompetitors. Small﹣businessownersarerightfullyconcernedaboutprivacy.Theydon'twantFacebooktoknoweverythingaboutthemandtheydon'twanttheircustomerlisttobeletouttoothers. Butsmallbusinessesdon'twanttolosethiseffectiveadvertisingmediumeither.MostFacebookadsarenotinvasiveoroffensive.Andmanyreceiversmayactuallybenefitfromreceivinghighlytargetedads﹣afterallthoseoysterloverslikelearningaboutTuesdaynight﹩1oysternight. 1HowdoestheauthorexplainFacebook'sfunctioninparagraph2? A.Byperforminganexperiment. B.Bygivinganexample. C.Byanalyzingthedata. D.Byleadingasurvey. 2Whatistheauthor'sattitudetowardsFacebookmentionedinparagraph3? A.Supportive. B.Objective. C.Doubtful. D.Respectful. 3WhatmakessmallbusinessesconcernedaboutFacebookaccordingtothetext? A.WhatpeopleexperienceonFacebook. B.ThatFacebookupdatesthelistsconstantly. C.ThatFacebookwillletouttheircustomers'privacy. D.ThattheircompetitorsbenefitmorefromFacebook. 4Whatcanbethebesttitleofthetext? A.Facebookisbenefitingsmallbusiness B.Facebookapowerfuladvertisementtool C.Facebookisprotectingcustomers'privacy D.Facebookamixedbagforsmallbusiness
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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塑料矿泉水瓶底部常见的可回收标志是
分类法是化学研究的重要方法．以下分类不正确的是
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现欲从含有CuSO4的废液中收铜同时得到工业原料硫酸亚铁晶体设计方案如图 1滤液A的成分是C物质是． 2从提高硫酸亚铁晶体回收率的角度分析该方案的一个不足之处是．
下列说法不正确的是
Iamthedirectorofwww.bethelindia.orginIndia.Withoutputtingourhandsoutand1askformoneyfrompeoplewegiveclotheswarm2blanketmedicineandeducationalsupporttopoorkids.Mostofthetimeweasafamilysufferwithwantsandneedsbutthesmilewebringinthefaceofsufferingisrewarding. Recentlyaladyinavillagehadaveryseriouslywoundedfootduetoinjuries.Thefoot3infectandthedoctorproposedimmediatesurgery4cutoffthefoot.Herhusbandandherfouryoungchildren5areinschoolwere6help.ItwasalmostinthemiddleofthenightwhenIcollectedmoneyfrommy89yearoldmothermydaughterandfrommyuncle.Iaddedtothisdonationandwenttothehouseofthewoman15kilometersawayfromourcampus. Wehandedoverthedonationforthe7operate.Thedoctorchangedhismindovernightand8nextdayhedecidedtodressthedeepwoundeveryotherdayforthreemonths.Thetreatmentcontinuedandfinallythedeepbloodypain9be100%healed.Wecongratulated10herhealthandthefamilyofthewomanisnowdoingwell.Wearesohappy.
Darkstairwayscanbeabitdangerousespeciallywhenitbecomeswetordamp.Arailingandsufficientlightningisimportantbutthecosttoinstallwiringcanbeabitexpensive.Sostoptryingtofindwaysinthedarkandoptforstylishalternativesthataresafeandeffective.1Theyalsosavemoneyonpermanentadditionsthatwouldcostalittlebitmore. ●InvolveCandleLanterns Ifyouwanttoaddvintage复古styletotheoutdoorstairwaythenaddaseriesofcandlelanterns.Surroundflamelesscandleswithsmallsmoothstonesinsidetheglassglobes.Thestoneswilladdnaturalbeautytothehome.2Itwilllookgreatandprovideadequateamountoflight. ●Addweatherproofflamelesscandlesonbothsideofthestaircase Batteryoperatedcandlesneednottobestored.Weather﹣proofcandlesandframelesscolumnswouldlookgreatonanoutdoorstairwayespeciallyifthestepsaresurroundedbyflowers.3.Aslongaswindisnotaproblemitwillworkexceptionallywelltolightway. ●4 Inanareawherestrongwindsgushesthereareapossibilitythewindowwillblowawaythecandle.Accordinglyconsiderusingsolidlights.Surroundthepostswithlowgrowingflowers.5Considerimpatiens凤仙花fordarklocationinhardinesszones3﹣10andmazusinsunnyarea.Withduecaretheywillgrowbeautifullyandsolarlightswilllightupthestairwaysadequately. A.Artificiallightisnotagoodchoice B.Forthesoilwillkeepthepostsfirmlyontheplace C.Itisoftenthemostneglectedthingwhiledecorating D.Decoratethesidesofoutdoorstepswithsolarlights E.Considerthesesmallbudgetideasandlightthehome F.Arrangethecolumncandlesingradualsizeonbothsidesofthesteps G.Furthermorethestoneswillweighdownthelanternstopreventgentlewind
从分子的角度分析下列解释不正确的是
IwaswanderingaroundtheAlbuquerqueairport.MyflighthadbeendelayedandIheardanannouncementIfanyonenearGateA﹣4understandsArabic阿拉伯语pleasecometothegateimmediately.GateA﹣4wasmyowngatesoIwentthere. Anolderwomanwascrumpled瘫倒onthefloorcryingloud.InhertraditionalPalestiniandresssheremindedmeofmygrandmother. Talktoherurgedtheflightagent.Wetoldhertheflightwasgoingtobelateandshedidthis. Ibentovertoputmyarmaroundthewomanandspokeuncertainly.Shu﹣dow﹣ashu﹣bid﹣uckhabibtiStanischwayminfadlickshu﹣bit﹣se﹣weeShestoppedcrying.Shethoughttheflighthadbeencanceled.SheneededtobeinElPasoforamedicaltreatmentthenextday.IsaidYou'llgettherejustlate.WhoispickingyouupLet'scallhim. Wecalledherson.InEnglishItoldhimthatIwouldstaywithhismotheruntilwegotontheplane.Shetalkedwithhim.Thenwecalledherothersonsjustforfun.ThenwecalledmydadandtheyspokeforawhileinArabicandfoundoutthattheyhadseveralsharedfriends.AfterthatIcalledsomePalestinianpoetsIknowandletthemchatwithher. Shewaslaughingalotbythenpattingmykneeandansweringquestions.Shepulledasackofhomemadecookiesfilledwithdatesandnutsandtoppedwithsugarfromherbagandofferedthemtothewomenatthegate.Tomyamazementnoonedeclined.Itwaslikeasacrament圣餐.ThetravelerfromArgentinathemomfromCaliforniathelovelywomanfromLaredo﹣wewereallsmilingcoveredwiththesamesugar. IlookedaroundthatgateandthoughtThisistheworldIwanttoliveinonewithnoapprehension.ThiscanstillhappenanywhereIthought.Noteverythingislost. 1Whydidtheolderwomanburstintotearsattheboardinggate A.Herflightwascanceled. B.Shecouldn'tmakeherselfunderstood. C.Shelostherairticket. D.Shethoughtshewouldn'tmakeitforhertreatment. 2HowdidtheolderwomanfeelaftertheauthortalkedtoherinArabic A.Confused. B.Delighted. C.Relieved. D.Disappointed. 3Whatdoestheunderlinedwordapprehensioninthelastparagraphmean A.Argument. B.Anxiety. C.Conflict. D.Restriction. 4Whatcouldbethebesttitleforthispassage A.CookiesatGateA﹣4. B.AnOddPalestinianWoman. C.AHarmoniousWorld. D.FlightDelayinAlbuquerque.
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处错误每句中最多有两处每处仅涉及一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. Thetermiscomingtoanend.Inordertoenrichlifeofexchangestudentsourschoolwillorganizeanadventurecampforusthissummervacation.Thatthesummercampfocusonistogetclosetonaturethroughhikingclimbingwildlifeobservationaswellaseducationalexperiences.Theywillhaveawonderfultimeexplorethenaturalworld.Meanwhilewewillmakefriendandlearnsomethingconnectingwithnature.ThosewhowereinterestedareaskedtosignupimmediatelyastheregistrationdeadlineforthecampisonJune10.Besideswearerequiredtosendtheentryformtostudentsunion@126.comandsubmitittotheStudents'UnionOffice.Whatachancetoexperiencenature!
分析处理图表信息是学习的一种重要方法如表是氯化钠和硝酸钾在不同温度下的溶解度． 这两种固体物质在水中的溶解度曲线如图所示 请仔细阅读图表后回到下列问题 1A曲线表示的是的溶解度曲线．填“NaCl”或“KNO3” 2P点的含义是． 3t2℃时将等质量的A和B的饱和溶液降温至t1℃所得溶液的质量分数关系是AB．填“＜”“＞”或“＝”
Whateverholidayyoucelebrateonethingisforsure﹣you'llfindeventsforchildrenonLongIslandthroughoutthemonthofDecember.FromholidayperformancestocraftslightshowsSantabreakfastsandmoreherearesomeofourfavorites. TheMagicalPolarExpress Familiestravelviatrolley有轨电车toTheNorthPoleatop﹣secretspotwherefamiliescangrabhotcocoaandcookiesthenmeetSantaelvesandothercharactersforabout30minutesbeforereturningtopointsofdeparture.Trolleyridesfeaturemusicandstorytelling.Pajama﹣wearingisencouragedphoto﹣takingisfree.TrolleydepartsfromAll﹣StarBowlinginRiverheadandTheOmniHamptonJitneyTerminalinSouthampton7p.m.﹣930p.m.FridaysSaturdaysSundaysrunningthroughDec.23additionaltimesmaybeavailablearrive30minutesinadvance ACharlieBrownChristmas CharlieBrownandhisfriendslearnwhatthetruemeaningofChristmasisinthistouchingplay.StayafterforphotoswithSantaandMrs.Clausandtomakeaholidaycraft. WHEN|WHERE3p.m.Dec.2123p.m.Dec.27attheNYCBTheatreatWestbury960BrushHollowRoadWestbury LongIslandFestivalofTrees The28thannualLongIslandFestivalofTreestakesplaceatCradleofAviationMuseumCharlesLindberghBlvd.GardenCity.Itfeaturesdisplayofdesignersdecoratedtreesgingerbreadcreationscookiedecoratingcostumedcharactersandvendorsfrom10a.m.﹣6p.m.Nov.24﹣25and10a.m.﹣5p.m.Nov.26. ImaginationMoversReindeerParty TheEmmyAward﹣winningrockbandforfamiliesisthrowingaReindeerPartyforLongIsland.Comeandlistentotheirpositivehitsongswithatouchofholidaycheerandsongsinthemix.Price﹩15﹩10forchildrenages2to12freeages1andyoungerticketsavailableinadvanceatcradleofaviationorg. 1Atwhicheventwillthevisitorsenjoyaplay? A.ACharlieBrownChristmas. B.TheMagicalPolarExpress. C.LongIslandFestivalofTrees. D.ImaginationMoversReindeerParty. 2WhatcanthevisitorsdoattheMagicalPolarExpress? A.Goontrolleyrides. B.Enjoytheliveconcert. C.Learnphotographforfree. D.Experiencetraditionalcrafts. 3Howmuchwillamotherwithtwo4﹣year﹣oldtwinspaytoattendaReindeerParty? A.﹩50. B.﹩54. C.﹩34. D.﹩35.
假定你是李华你校国际部在招聘一名兼职人员.你有意应聘请按要求用英语写一封应聘信. 要点1.有英语优势 2.协助外教的工作经历. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
假定你是李华.你市博物院将举行中国传统民俗文化展请给你校交换生Peter写一封电子邮件.要点如下 1.展览时间 2.展览内容 3.邀请参加. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
碳和碳的化合物是初中学习的重要内容． 1金刚石石墨和C60都是碳元素的单质下列说法正确的是填字母代号． A．它们都是同种物质B．它们的原子排列方式不同 C．它们都能导电D．常温下它们都能与氧气反应 2实验室制取二氧化碳的原理是用化学方程式表示．若要得到干燥纯净的二氧化碳则 发生装置产生的二氧化碳按气流方向连接顺序为填导管接口字母CO2→→→→→． 3实验结束后装置B锥形瓶中废液中溶质的成分是什么 【猜想与假设】猜想一CaCl2猜想二CaCl2HCl 猜想三CaCl2HClCaCO3该同学认为猜想三是错误的理由是． 【实验验证】同学们对猜想与假设进行验证【结论】分析图象数据得出废液中含有的阳离子有．OA段发生的反应为用化学方程式表示AB段溶液的pH变大不变或变小． 4现取含碳酸钙80%的石灰石12.5g和94.4g稀盐酸恰好完全反应石灰石中的杂质不溶于水也不与稀盐酸反应求恰好完全反应后所得溶液中溶质的质量分数．
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
向一定质量的AgNO3和FeNO32的混合溶液中加入mgZn粉充分反应后过滤将滤液洗涤干燥后称量得到的固体质量仍为mg．下列说法正确的是
下列各组物质中能相互反应且反应后溶液质量增加的是
整理一批数据由一人做80小时现在计划先由一些人做2小时再增加5人做8小时完成这项工作的先做2小时的有多少人
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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