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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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一项工作甲单独完成要9天乙单独完成要12天丙单独完成要15天若甲丙先做3天后甲因故离开由乙接替甲的
一项工程甲单独完成要20天乙单独完成要25天现由甲先做2天然后甲乙合做余下的部分还要多少天才能完成
甲乙两人完成某项工作甲单独完成比乙单独完成快15天.如果甲单独先工作10天再由乙单独工作15天就可
一项工程甲单独完成要20天乙单独完成要25天现由甲先做2天然后甲乙合做余下的部分还要多少天才能完成这
某项工作若甲单独做需40天完成乙单独做需24天完成如果乙先做12天再由甲去完成问甲还要儆几天可以完成
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.一项工程甲单独做要10天完成乙单独做要15天完成两人合做4天后剩下的部分由乙单独做还需要几天完成
有甲乙两项工程张师傅单独完成甲工程需6天单独完成乙工程需30天李师傅单独完成甲工程需18天单独完成乙
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一件工程甲单独完成要12天乙单独完成需9天若甲先做若干天再乙单独完成共需10天甲单独做了几天
一项工程甲单独完成要20天乙单独完成要25天则由甲先做2天然后甲乙合做余下的部分还要天才能完成.
一项工程甲单独做要15天完成乙单独做要18天完成.如果甲先做5天剩下的由乙独做还要多少天才能完成
一项工作甲单独完成要9天乙单独完成要12天丙单独完成要15天若甲丙先做3天后甲因故离开由乙接替甲的
一项工程甲单独完成要20天乙单独完成要25天则由甲先做2天然后甲乙合做余下的部分还要天才能完成.
完成某项工程甲单独做需12天完成乙单独做需8天完成现在甲先做了3天乙再参加合做求完成这项工程甲乙合做
有甲乙两项工程张师傅单独完成甲工程需6天单独完成乙工程需30天李师傅单独完成甲工程需18天单独完成乙
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一项工程甲单独做要20天完成乙单独做要30天完成.现在甲先做6天后剩下的由乙单独做完.乙做了多少天
有一项工程若甲队单独做恰好在规定日期完成若乙队单独做要超过规定日期3天完成现在先由甲乙两队合做2天后
有甲乙两项工程张师傅单独完成甲工程需6天单独完成乙工程需30天李师傅单独完成甲工程需18天单独完成乙
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某项工程若由甲队单独施工刚好如期完成若由乙队单独施工则要超期3天完成.现由甲乙两队同时施工2天后剩下
有甲乙两项工程张师傅单独完成甲工程需6天.单独完成乙工程需30天李师傅单独完成甲工程需18天单独完成
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某项工作先由甲单独做45天再由乙单独做18天可以完成如果甲乙两人合作可30天完成.现由甲先单独做2
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下列各物质各物质中氯元素化合价最低的是
将一定量的锌粉加入到硫酸亚铁硫酸铜和硫酸镁的混合溶液中过一段时间后过滤向滤渣中加入稀盐酸有气泡产生则下列叙述正确的是 ①滤渣中一定含有锌 ②滤渣中一定含有铜可能含有锌 ③向滤渣中加入稀盐酸最后溶液一定变成浅绿色 ④滤液中溶质一定含有硫酸锌和硫酸镁 ⑤滤液的颜色不可能为浅绿色.
通过下列实验操作和现象能得出相应结论的是
用化学符号填空 1氧元素 22个碳原子 3氢氧根离子 4磁铁矿.
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Helpfultipsforcollege﹣boundseniors Researchingacollegeisoneofthemosttime﹣consumingtasksthatyou'llencounter.1Forexamplewhatclassesandfacilitiesthecollegehastoofferandwhatsportsitoffers.Afternarrowingyourchoicestoagroupofcollegesyou'llhavetostarttoresearchtheseindepth.2Heorshemaybeabletohelpyoufindthingsaboutthecollegesthatyoucouldnotgetyourself. Knowingwhatyouwanttostudyisanotherkeytolookingforacollege.3ByknowingwhatIwanttodoIcanthenlookatcollegesthatI'vebeenthinkingaboutapplyingtoandnarrowmychoicesdown.Ifacollegedoesn'thavethecoursesIneedthenit'sdefinitelyoutofthepicture. Anotherkeythingtolookforisthecollege'stestingrequirements.4SomecollegesalsorequireanSATIItestincertainareasforexampleEnglishorMath.Remembertolookatacollege'sGPArequirementstoo.Youmayfindacollegewherethere'severythingyouwantbutyourGPAisn'thighenoughtobeconsidered.Inthiscaseyoumayneedtoattendajuniorcollegeforoneortwoyears. 5Atthispointyoumaywanttohavealongdiscussionwithyourparentsandfindouthowmuchthey'rewillingandabletospendoncollege.Ifitisn'tenoughtocoveryourfulltuitionthenyoumaywanttoapplyforfinancialaidorascholarship.Andyourfinaloptionmaybelookingforacollegethatdoesn'tcostasmuch. A.AllcollegesrequireanSAToranACTtest. B.Andlastlybutdefinitelynottheleastistuition. C.Lookforacollegenowifyouplanonattendingone. D.Youneedtofindoutmanybasicsaboutpossiblecolleges. E.Ifyouwillbeaseniorinthenearfuturethisarticleisforyou. F.Iplantomajorinbusinessmanagementandminorincomputerapplications. G.Ifyouhaveacollegecounseloratyourschoolthiswouldbeagoodtimetoaskforadvice.
假定英语课上英语老师要求同桌之间互相修改作文请你修改你同桌的以下作文. 文中共有10处语言错误每句中最多有两处.错误涉及一个单词的增加删除或修改. 删除把多余的词用斜线\划掉. 增加在缺词处加一个漏字符号∧并在该词下面写出该加的词. 修改在错的词下划一横线在该词下面写出修改后的词. 注意1每处错误及修改均仅限一词. 2只允许修改10处多者从11处起不计分. Dearfriends ItisagreathonortosharewithyoumyexperienceinmakingEnglishspeeches. TotellatruthmyspokenEnglishusedtobeabigheadacheforme.DuetomyterriblepronunciationIoftengotmisunderstoodorevenlaughedbyothers.Ineversucceedinspeechcompetitions.ThereforeIrefusedtogiveup.EverydayIspenttwohourslistentoEnglishprogramstoimprovemyoralskills.Tomyjoymyeffortwasfinallypaidoff.Imadesteadilyprogressandmanagedtowinprizesinsomespeechcompetition. Soproblemscanhelpusgrowifwedealwithitbravelyandproperly.ThisiswhichI'velearnedfrommyexperience.
Whenadisasterstrikeshumanitarianagencies人道主义机构likeTheWorldFoodProgrammeWFPneedinformationmorethananythingelse.Theyneedaclearpictureofthedamagetoroadsandbridgesforexampletobeabletotakequickaction. WFPhaspublishedapictureofdamagetotheepicenter震中oftheearthquakewhichstruckHaiti.Thepicturewhichhasbeenproducedintheformofasatellite﹣basedmapshowsgreatdamagetotheepicenterwhere90%ofthebuildingsweredestroyed.Inthemaponepixel像素standsforhalfameterofland.That'saverycloselookofhowthingsareontheground.Ithelpedrescueteamsalot. WFP'sEmergencyPreparednessandResponseBranchproducedaseriesofclearmapsshowingthedamageofHaiti.ThemapshavebeenproducedinpartnershipwitharesearchanddevelopmentinstitutecalledInformationTechnologyforHumanitarianAssistanceCooperationandActionITHACA.TheorganizationwassetupyearsagoespeciallytoworkwithWFPinbringingdevelopmentsofsatellitetechnologyintoitsresponsetodisasters.Justafewyearsagothiswouldhavemeanthavingtowaitforhelicopterstooverflyareasandforhumanbeingstophysicallyseethedamage.Thesatelliteswhichoperatearoundhighaboveourheadsareofgreathelp.Theyareabletoseethroughcloudswhichishelpfulwhenweatherconditionspreventtheuseofopticalinstruments光学仪器. NowbothWFPandITHACAhaveteamsworkingaroundtheclocktomakeuseofmorenewtechnologiestohelppeopleactivelydealwithnaturaldisasters.Deathsandinjuriesfromnaturaldisasterscanbereducedifthedisastercanbepredicted.Severaldisasterpredictiontechnologieshavebeendevelopedovertheyears.WearealsoworkinghardtoprovideamoreeffectiveinstrumenttopredictnaturaldisasterssaidRiccardoRoscellipresidentofITHACA. 1AccordingtoParagraph1whatdoesWFPextremelyneedafteradisaster? A.Doctorsandvolunteers. B.Medicalandfoodsupplies. C.Theinformationaboutthedamage. D.Thedetailsaboutthecausesofthedisaster. 2WhatdoestheauthormainlywanttoshowuswhenhementionstheHaitianearthquakeinParagraph2? A.Thesatellite﹣basedmapisuseful. B.Itwasaveryseriousearthquake. C.Itcausedmanyinjuriesanddeaths. D.Thepictureofthedamageisunclear. 3Whatistheuniqueadvantageofthesatellitescomparedwithopticalinstruments? A.Theycanbeusedasthesubstitutionofhelicopters. B.Theycanreducedeathsandinjuriesfromnaturaldisasters. C.Theycanbeoperatedaroundhighaboveourheads. D.Theycanseethroughcloudsinbadweatherconditions. 4WhatcanwelearnfromRiccardoRoscelli'swordsinthelastparagraph? A.Itisnoteasyforpeopletopredictnaturaldisasters. B.Naturaldisasterscancausemoreterribleconsequences. C.Theyaretryingtofindoutabetterdisasterpredictioninstrument. D.Theyhavestudieddisasterpredictiontechnologiesforyears.
某研究性学习小组的同学将钠置于充满CO2的集气瓶中进行燃烧充分反应后集气瓶内有黑色固体和白色固体生成.该研究性学习小组的同学经分析得知白色固体中不可能有NaOH原因是.他们对白色固体成分进一步探究. 【提出问题】白色固体是什么 【查阅资料】Na2O2+H2O═2NaOH2Na+2H2O═2NaOH+H2↑CaC12溶液呈中性. 【猜想与假设】Ⅰ.白色固体是Na2O Ⅱ.白色固体是 Ⅲ.白色固体还可能是Na2O与Na2CO3组成的棍合物. 【设计实验】 【得出结论】钠在CO2中燃烧的化学方程式为. 【反思与交流】①钠着火可以选用的灭火物质是填字母代号. A.水B.干沙土C.二氧化碳 ②在元素周期表中KNa属同一族元素它们具有相似的化学性质请写出K在CO2中燃烧的化学方程式.
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HighlightsofIceland Day1 OurrepresentativewillmeetyouattheairportandabuswillbringyoutoyourhotelinthecapitalReykjavik.Aftercheckinginyourguidewillleadyoutovisitsomeofthecity'shighlights. Day2 WetourIceland^GoldenCircletakinginThingvellirNationalParkandgullfossWaterfallandseeTrokkurwhichspouts喷射a100﹣footjetofwaterintotheairevery3﹣5minutes. Day3 Day3isleftfreesothatyoucantryoutouroptionaltours.ExploretheThorsmorkValleyonajeepride.Anotheroptionistodriveoutontotheglaciers冰川andtakeasnowmobiletour.Whale﹣watchingboattripsarealsoavailablefromReykjavikharbour. Day4 Thetourendsatthecityairport. UsefulInformation •ThelocalcurrencyistheIcelandicKronaISK.Theoptionaltoursonday3costextraandaminimumof4peopleisrequiredforboththejeepandsnowmobilingtours. CurrentcostsThorsmorkJeeptour27000ISKsnowmobiletour34200ISKwhale﹣watchingsummeronly9000ISK. •Tippingisvoluntarybutisexpectedinthispartoftheworldforworkersinthetourismindustry. •Youmusthavetravelinsurancetotravelonourtours.Youcanarrangeforthisyourselforbuyitthroughourcompany. •Youcaneitherbookaflightwithusorarrangeyourownflight.Ifyouchoosethelatteryouwillhavetomakeyourownwaytothehoteldetailsofwhichwillbesenttoyouinadvance. 1OnwhichdaycanthetouristsseeGullfossWaterfall? A.Day1. B.Day2. C.Day3. D.Day4. 2Whatcanbelearnedaboutthewhale﹣watchingtour? A.Itisoneoftheoptionaltours. B.Itisavailableallyearround. C.Itcostsmorethanthesnowmobiletour. D.Itrequiresatleastfourpeopleforeachtour. 3Whatisrequiredofthetourists? A.Tippingtheirguides. B.Bookingaflightwiththetourcompany. C.Reachingtheirhotelinadvance. D.Buyingtravelinsurance.
分类是化学学习研究的重要方法.下列物质中属于混合物的是
水是人类生活不可缺少的物质下列有关水的叙述错误的是
AsanoldEnglishsayinggoeshonestyisthebestpolicy.Itismorethananoldcliché陈词滥调but1goodwaytoliveyourlife. Firsthonestyisthe2easychoicethatwecanmake.Whenpeoplegetcaughtinliesitalwayscoststhemsomething.Manyrelationshipscanbedestroyedbylies. Secondhonestygivesusmuch3free.Manypeoplebelievethatbeinghonestlimitstheminlifebutthatisnottrue.Soonerorlaterthosedishonestpeople4payapricefortheiractsonthecontrarywhenwearehonestweare5truefree. Ifthereweretwopeople6standbeforeyouapersonwitharecordofbeinghonestandaperson7isknowntobedishonestwhowouldyoubemorelikely8believe?I'msuremostpeoplewouldsidewiththehonestperson.Weliveeitherinthetruth9inlies.Truthsetsusfreeandliesleaveusinnothingbutmoretroubles.Honestyisachoicethatwemakeeachday.Thechoiceis10you.Whatwillyouchoose?
要除去下列物质中的少量杂质括号内物质为杂质下列实验方案设计中不合理的是
下列鉴别物质所用的方法或试剂中错误的是
新装修房室内存在甲醛CH2O苯C6H6等有害物质.下列叙述正确的是
黄铜矿主要成分为CuFeS2经初步处理后所得溶液甲中的溶质为Fe2SO43CuSO4及H2SO4.某同学通过废铁屑与溶液甲反应制取补血剂原料碳酸亚铁并回收铜.主要步骤如图1所示 1操作a的名称是. 2步骤Ⅰ中生成铜的化学方程式为. 3Fe2SO43与铁反应的化学方程式为xFe2SO43+yFe═zFeSO4其中xyz为化学计量数z的值为. 4步骤Ⅱ中加入一种可溶性试剂可实现其转化从复分解反应发生的条件分析该试剂可以是填化学式. 5为了测定试剂b的溶质质量分数该同学做了以下实验将等质量的镁铁锌三种金属分别放入三份均为mg的试剂b中生成H2的质量与反应时间的关系如图2所示则金属x是填化学式下同肯定有剩余的金属是.
ATennesseewomancelebratedherbirthdaywithabittersweetgiftfrombeyondthegrave﹣﹣flowersfromherfatherwhodiedfiveyearsago. MichaelWilliamSellerspre﹣paidforabouquetof1tobedeliveredtohisdaughterBaileyevery2untilsheturned21.AndonFridayBailey3thegiftherlastfromherdad. Mydad4whenIwas16fromcancerandbeforehediedhepre﹣paidflowerssoIcouldreceivethemeveryyearonmybirthdaytheshe.Thisismy21stbirthdayflowersandthe5. Baileysaidthespecialgiftmadebirthdays6.SincethatdayI'vehatedmybirthday7healwaysmadeitsospecialBaileysaidIwasespecially8my21stbecauseIknewitwouldbethelastyear. Baileysaidthisyear'sgiftandbirthdaycardwereespecially9.Ibrokedownshesaid.Thatletterwasvery10andsadallatthesametime. Thisismylastlovelettertoherfather11.Idonotwantyoutodropanother12formeforIamina13place.Healsotoldhertoalwaysrespecthermotherandstay14toherself.Behappyandlivelifetothefullesthewrote.Iwillbewithforeverjust15andIwillbe. Thatwasmydadshesaid.Hewastryingtomakemybirthday16. Socialmediausers17thepostcallingitbothheartwarmingandheartbreaking. Otherspraisedherfathercallinghimaan18ofwhatagoodmanislike Hewouldbevery19Baileysaidhe'dbeveryproudthatit20alotofpeople. 1A.flowers B.cakes C.presents D.grapes 2A.wedding B.birthday C.funeral D.exam 3A.sold B.cheated C.received D.threw 4A.passeddown B.passedout C.passedby D.passedaway 5A.first B.last C.best D.most 6A.tough B.happy C.natural D.honest 7A.because B.but C.so D.if 8A.liking B.expecting C.hating D.preparing 9A.expensive B.careful C.beautiful D.meaningful 10A.difficult B.sweet C.fortunate D.selfish 11A.smiled B.forgot C.wrote D.sighed 12A.coin B.hair C.tear D.leaf 13A.better B.hotter C.colder D.worse 14A.hard B.wealthy C.foolish D.true 15A.walkaround B.putforward C.lookaround D.giveup 16A.tiring B.amazing C.boring D.embarrassing 17A.respondedto B.ledto C.contributedto D.cameto 18A.joke B.story C.prize D.example 19Avivid B.proud C.nervous D.ashamed 20A.knocked B.fired C.informed D.touched
下列过程仅发生物理变化的是
运用图示法可以帮助我们巧学化学.下列化学知识用相应图示表示正确的是
下列符号与其叙述对应一致的是
假定你是李华你校将迎接英国学生代表团.作为学校书法社团部长请你写一篇发言稿要点如下 1.介绍书法用品 2.阐述书法学习的好处 3.邀请英国学生参加书法练习活动 注意 1.词数100左右 2.可以适当增加细节以使行文连贯 3.开头已为你写好. 参考词汇书法calligraphy 文房四宝theFourTreasuresoftheStudywritingbrushinkstickpaperinkslab Dearfriends We'dliketoshareourculturewithyoubyintroducingyoutotheartofChinesecalligraphy.
柳州工农业发达有众多名牌产品如①柳钢船用钢板②三江茶油③“大力”牌氯化铵④“鱼峰”牌水泥⑤“网山”牌白砂糖⑥柳城蜜橘⑦“大力”牌甲醛溶液⑧融水香鸭.选择适当的物质填在下列横线上填序号 1使用金属材料制成的是 2属于氮肥的是 3属于无机非金属建筑材料的是 4主要成分是蔗糖的是 5富含蛋白质的是 6含有丰富维生素C的是 7可用于浸泡动物标本的是 8属于油脂的是.
假如你是新华中学的学生会__李华你校学生会应英国WestminsterSchool邀请暑假将到该校进行交流访问向该校学生介绍中国传统文化.请你给该校联系人Mr.Smith写一封邮件要点如下 1.感谢对方的邀请 2.询问食宿活动安排和说明要介绍的传统文化内容 3.祝愿交流活动成功. 注意1.词数100左右 2.可以适当增加细节以使行文连贯 3.开头和结尾已给出不计入总词数. DearMr.Smith IamLiHuachairmanoftheStudentUnionofXinHuaHighSchool. Yours LiHua
科学家证明了“一氧化氮气体分子是保持心血管系统健康的信号分子”.通常情况下一氧化氮是一种无色无味的有毒气体难溶于水.其在常温下易与氧气反应生成有毒的二氧化氮气体.二氧化氮又能与水反应生成一种酸和一氧化氮在该反应中氮元素的化合价既升高又降低.结合材料回答下列问题 1一氧化氮的物理性质是回答一点即可其与氧气反应的化学方程式为. 2二氧化氮与水反应的化学方程式是.
Forhealthyadultsexpertssaythateatingalotoffruitisunlikelytogetyouintotroubleaslongasit'spartof1normaldiet. Themainconcernwithovereatingfruitis2itnaturalsugaryetresearchhasalwayslinkedwhole﹣fruiteatingtoa3reduceriskforobesityandotherdiseases.That'sbecausewholefruithasafewbuilt﹣in4advaniagethatseemtoreduceanysugar﹣drivenhealthrisks.Itcontainstwokindsoffiberwhichformabarrierontheinsideofthesmallintestine肠.Thisbarrierlimitstherateofsugarabsorbingsothattheliver肝isnotharmedjustlikestoppingalargewave5buildinganunderwaterwall.Fruitfiberalso6helpfoodreachthefinalpartofyoursmallintestinesoonersoyoutendtofeelfull7quickaftereatingfruit.Asaresultthechancesyouwillovereatfruitarerelativelylow. Somefruitsmaybebetter8eatthanothers.Forexampleberrieshavebeenlinkedtobothbetterheartandbetterbrainhealth.9grapesmayneedmoreself﹣control.They'remainlylittlebagsofsugar. Ifyoulovewholefruitthere'slittleevidencetoshow10eatingit一evenawholelotofit﹣isbadforyourhealth.
BeneaththewaterintheChina'sQiandaoLakeliesahiddentreasure.TheancientcityofShiChengalsoknownasLionCitylocatedintheprovinceofZhejianghasbeensubmergedunderwaterfor53years.ShiChengwasfoundedabout1300yearsagoinavalleysurroundedbytheFiveLionMountains.WhentheChinesegovernmentdecidedtheyneededanewhydroelectricpowerstation水力发电站adamandman﹣madelakewereconstructedandthecitywasleftatthebottomofthisnewbodyofwater.Nowitsitsatdepthsrangingfrom85feettoabout103feet. MuchliketheMachuPicchuruinsinPeruthisunderwatercityremainedforgottenuntilsomerenewedinterestsleadtoitsrediscovery.QiuFengalocalofficialinchargeoftourismthoughtaboututilizingShiChengforentertainmentonthelakeandasadestinationfordivingclubs.OnSeptember182001scubadiversmadetheirfirstattemptunderwater.Wewerelucky.AssoonaswedivedintothelakewefoundtheoutsidewallofthetownandevenpickedupabrickQiutoldGuangzhouDailyinaninterview.Moreresearchwasconductedanditwasdiscoveredthattheentiretownwasintactt881includingwoodenbeamsandstairs.Aftertheinitialfindingsinternationalarchaeologistsandafilmcrewthenrecordedthepreservationofthelostruins. Lookingatsurfaceofthelakedottedwithover1000islandsyou'dneverknowthatanentirecitywasbelow. It'sincredibletothinkthatafterallthistimethestructurestillremainsintactandwecouldonedayvisitit.UntilthenShiChengwillcontinuetoremaininconspicuouslysubmerged. 1WhywasShiChengcoveredbywateraccordingtothepassage? A.Becausethecityhasalonghistory. B.Becausethegovernmentcouldattractmoretouristsbydoingso. C.Becausethegovernmentneededtobuildapowerstationwhereitwas. D.Themountainssurroundingthecityledtotheconsequence. 2Whatdoestheunderlinedwordinitialmeaninparagraph2? A.Original B.Great C.Wonderful D.Amazing 3WhatisthemostunbelievablepartofShiChengaccordingtothepassage? A.IthassomethingtodowithMachuPicchuruinsinPeru. B.Noonewasinterestedinthelostcityforalongtime. C.Itsstructurekeepsperfectinthewaterforalongtime. D.Thereareover1000islandsprotectingthelostcity. 4Whowillmostprobablycometovisitthelostcity? A.Someonewholikesswimming. B.Someonewholikesdiving. C.Someonewholikesclimbingmountains. D.Someonewholikestakingpictures.
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