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要配制一种浓度为10%的盐水，18克盐需要加水 克．
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一种盐水盐与水的比是1150要配制这种盐水755克需盐克需水克．
6，180
4，850
7，650
5，750
配制一种盐水放入盐25克水200克则盐和盐水的比是
1：8
1：9
1：10
一种农用盐水用盐和水按150配制而成．1要配制这种盐水255千克需要盐和水各多少千克2桶内备有300
一种农用盐水用盐和水按150配制而成． 1要配制这种盐水255千克需要盐和水各多少千克 2桶内
一种盐水的含盐率是20%现在有5克盐要配制这种盐水需要加入水多少克
配制一种药液药和水的质量比是160.75克药需要加水克．如要配制这种药水1525克要加药克．
一种盐水盐与水的比是1150如果有盐12克要配制这种盐水需加水
1800克
750克
7克
5克
有含盐8%的盐水40千克要配制含盐20%的盐水100千克需要加水和盐各多少千克
一种盐水盐与水的比是19要调制这样一杯90克的盐水需要放盐多少克
实验课上老师要配制一种盐水在2.5千克的水中加入100克盐盐和盐水质量的比是多少照这样计算15克盐需
一种盐水其盐与水的比是1150要配制这种盐水755千克需要盐和水各多少千克
配制一种盐水盐和水的质量比是120要配制这种盐水105克应放入5克盐．
配制一种盐水在200克水中放了20克盐盐和盐水的比是
1：11
1：10
10：11
10：1
配制一种盐水在200克水中放了20克盐盐和盐水的比是110．．判断对错
配制一种盐水10千克水中加2千克盐．现在要配制60千克这种盐水需要盐多少千克
一种盐酸的浓度是30%另一种盐酸的浓度是6%酸洗管道要配制浓度10%的盐酸60kg应取这两种盐酸各多
配制一种盐水．盐和水的重量比是131有盐10克应加水克．
31
30
310
一种盐水按盐和水1100配制而成．现要配制这种盐水8008克需要盐千克．
配置一种盐水用5克盐需加水200克现有水800克需盐克．
按盐和水的比为17配制一种盐水这种盐水的含盐率是%现有水98克配制这种盐水需要加盐克．
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有下列实验操作及对实验现象的描述其中错误的是 A．先用蒸馏水润洗pH试纸然后用玻璃棒蘸取少量稀盐酸滴在pH试纸上测定该HCl的pH值． B．酸式滴定管用蒸馏水洗净后先用标准液润洗然后再装入标准液． C．反应FeCl3+3KSCN⇌FeSCN3+3KCl达到平衡后向溶液中加入少量KCl固体溶液颜色变浅． D．CuSO4溶液中滴入少量NaOH得到新制的氢氧化铜然后再滴入少量乙醛加热至沸腾后可检验醛基． E．制取乙酸乙酯时为了使受热均匀一般采用水浴加热．
5千克棉花的比5千克铁的轻．．判断对错
30分Howdareyou!Myangerfinallyburstoutwhenmyson1togotothepianoclassesforthethirdtimethatday.Herolledhiseyesatmewhichmademeeven2.Icompletelylostmy3andscreamedatthetopofmylungsEnough!Youarenotmyboyanymore!Hedidn't4ortalkbacktome.Herespondedin5withalookofhelplessnessthatIhadneverseenbefore.Heusedtocryviolentlyandbegmeto6him.Theinnocenceshininginhisbigeyeswould7thathot﹣temperedbeastinmeawayintheend.8.thistime… Didwhathehaddonereallymakeme9?No.Didsuchangercomeentirelyfromhisimproper10?No.HadIevergivenitachancetolistentoand11him?No.Mydemandingjobmy12houseworkmykid'scryforcompany…allformedaminefield雷区andallthatwasneededto13itupwasafuse导火索.Mysonwasthe14. Therestofthedayhe15anoutdoorwalkarideintheparkandevenhisfavoritegamesandjustwantedtobealone.Icould16thegreatestsorrowandthemosttrueinnocenceinhiseyes.AfteradmittingmyownfaultIheldthistinytremblingcreature17inmyarmstearsswellinginmyeyes. ForthosewhobelieveSticksandstonesmaybreakthebonebut18canneverhurtanyoneIhaveapieceofheartfeltadvice.Donottrythismostpowerfulweapon19thepeopleyoulove.Itis20enoughtocutthedeepestintoasoul. 1A.refused B.requested C.decided D.demanded 2A.calmer B.emptier C.happier D.angrier 3A.breath B.weight C.temper D.thought 4A.cry B.shout C.smile D.respond 5A.doubt B.relief C.silence D.surprise 6A.pardon B.praise C.abandon D.accompany 7A.put B.give C.throw D.drive 8A.Otherwise B.However C.Therefore D.Moreover 9A.satisfied B.puzzled C.moved D.annoyed 10A.advice B.behavior C.words D.argument 11A.hug B.blame C.forgive D.understand 12A.endless B.enough C.important D.meaningful 13A.put B.blow C.heat D.burn 14A.choice B.answer C.victim D.disaster 15A.declined B.shared C.enjoyed D.accepted 16A.retell B.forget C.read D.forecast 17A.rudely B.firmly C.loosely D.casually 18A.voice B.words C.force D.feelings 19A.for B.with C.beyond D.against 20A.hard B.soft C.sharp D.smooth
一个等腰三角形的一个顶角是26°它的底角是．
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Areyoutrulyhappy?Doyoueverknowwhatitmeanstobehappyandwhatittakestoachievehappiness?1.ThefollowingareafewtipsthatIfollowtocreatehappinessinmylife.※Makeaplanforachievinggoalsthatyoubelievewillmakeyouhappy.Yourmoodswillverylikelyincreaseifyouaregoingaftersomethingyouvalue.※Surroundyourselfwithhappypeople.Itiseasytobegintothinknegativelywhenyouaresurroundedbypeoplewhothinkthatway.2.※Whensomethinggoeswrongtrytofigureoutasolutioninsteadofbeingabsorbedinselfpity.Trulyhappypeopledon'tallowsetbackstoaffecttheirmoodbecausetheyknowthatwithalittlethoughttheycanturnthecircumstancesbacktotheirfavor.※3.Thesefewminuteswillgiveyoutheopportunitytofocusonthepositivethingsinyourlifeandwillleadyoutocontinuoushappiness.※4.Whetheryoutreatyourselftolunchtakealongrelaxingbathorsimplyspendafewextraminutesonyourappearanceyouwillbesubconsciously下意识地puttingyourselfinabettermood.※Findingthehumorinsituationscanalsoleadtohappiness.Findawaytomakelightofasituationthatwouldotherwisemakeyouhappy.※Keepinghealthyisanotherwaytoachievehappiness.5.A.Whatmakesonepersonhappymaybeverydifferentfromwhatmakessomeoneelsehappy.B.Onthecontraryifyouarearoundpeoplewhoarehappytheiremotionalstatewillbeinfectious.C.Beingoverweightornoteatingnutritiousfoodscanhaveanegativeeffectonyourmood.D.Theseareimportantquestionsforanyonewhoisseekinghappinesstoaskthemselves.E.Spendafewminuteseachdaythinkingaboutthethinsthatmakeyouhappy.F.Therearesometipsinlifethatleadtohappiness.G.It'salsoimportanttotakesometimeeachdaytodosomethingniceforyourself.
Todaywebringyouanoldtale.It'sthestoryofthethreelittlepigsandthebigbadwolfthatblewdownahousemadeofstrawandonemadeofsticks.Theonlyhouseleftstandingwastheonemadeofbricks.Nowthereisnewevidencetosuggestthathousesbuiltwithbalesofstrawcanbeverystrong.Theyarealsoveryenvironmental.PeteWalkerisaprofessorattheUniversityofBathinBritain.Heandateamofresearcherstherehavebuiltahousemadeoutofstrawbalesandhempmaterial.Duringthenexttwelvemonthstheteamwillstudytheeffectivenessofthesematerialsinhomebuilding.ProfessorWalkersaystherearemanygoodreasonsforusingstraw.ProfessorWalker'Oneofthebenefitsisit'sarelativelyinexpensiverenewablematerialthat'sreadilyavailable.'Healsoagreesthatstrawtakesincarbondioxideasitgrowsandhelpstheenvironmentinotherways.Soitcanbeseenashavingnoharmfuleffectsontheenvironment.ProfessorWalker'Thestrawbalewallsarerelativelythckandsoallthatstrawprovidesverygoodthermalinsulation.Sowemakebuildingsthatrequireverylittleheatinginthewinterorindeedverylittlecoolinginthesummer.Sotheyrequireverylittleadditionalenergy.'ProfessorWalkersaysthisreduceshomeoperatingexpenses.Italsoreducestheeffectontheenvironment.Hesaysthecurrentinterestinstrawbalehousesisadirectresponsetotheproblemofclimatechange.DavidLanfearownsaneco﹣friendlyhomebuildingserviceintheUnitedStatescalledBaleonBaleConstruction.Hesayshelaughedwhensomefriendsfirsttoldhimabouthousesbuiltofstraw.Butafterdoinghisownresearchhelearnedthatbuildingwithstrawbalesmadealotofsense.Hehasnowhelpedtobuildmorethantenstrawbalehousesandsaysthebuildingmaterialisbecomingmorewidelyaccepted.Tobuildthehouseshefillsawoodframewithtightlypackedbalesofstraw.Nexthecoatsthewallsinsideandoutwithlayersofclayplaster.Hesaysthecommonideasaboutstrawhousescontinueincludingstoriesaboutthethreatoffire.Mr.Lanfearsaysstrawbalehouseshavedonewellwhentestedforfireresistance.Andhesayshisbuildersusethesamebuildingmethodsastraditionalbuilderstokeepoutrain.DavidLanfear'Weusewhatwecallgoodshoesandagoodhatandthatwouldbeasolidfoundationandareallygoodroof.'1What'sDavidLanfear'sattitudetowardsthestrawhousesatlast?A.Ridiculous.B.Approving.C.Defensive.D.Unbelievable.2Whatcanweinferfromthepassage?A.Usingstrawtobuildhousesisdearerthanusingbricks.B.Thehousesbuiltwithbalesofstrawarestrongerthanthosebuiltwithbricks.C.Strawwhichisconvenienttogetismuchcheaperthanthickbricks.D.Housesmadeofbricksarenobetterthanthosemadeofstraw.3Accordingtothepassageweknowthat.A.thereissomeexperienceinbuildingthestrawhousesB.thehousemadeofstrawbalesisthesameasthetraditionaloneC.thehousemadeofstrawbalesisstillunderresearchD.it'suncertainthatthestrawhousecanbeverystrong
I'vecheatedinschoolwhenIthoughtthatIcouldgetawaywithit.I'mnotproudofitandIdon'tusuallyfeelverygoodaboutmyselfafterwardsbutsometimesit'stheonlywaypossibletosurviveinapressurecooker.Myparentsarereallysetonmygettinggoodgrades.Theystudymyreportcardthesamewaytheyexaminethenewspaper'sstockmarketpage.AndtheymakemefeelthatI'vegottoliveuptotheirexpectations.Butoftenit'slikeeachteacheractsasifhisistheonlysubjectwehave.Theythinknothingofpilingonourhomeworkorgivingsurprisequizzes.Sometimeswehavetotaketwoorthreetestsindifferentsubjectsonthesameday.I'dliketoseealotofadultsIknowpreparingforthat.Whenthepressurebecomestoohighsomekidsmayresortto诉诸于cheating.Ifyouhavethreeorfoursubjectstostudyforyou'renotgoingtobeabletodevoteenoughtimetoeachsubjectinordertobewellpreparedforeachclass.Besidesitmaybetheonlywaylefttoliveuptoyourparents'expectationsandcompetewiththetopstudentsintheclass.Everybodyknowsthatifyoucheatit'simportantnottogetcaught.Fewthingscancausemoreofchaos.Oncemyelderbrothergotcaughtcheatingonamathfinal.Myparentsactedasthoughhe'dcommittedafederalcrime.TheassistantprincipalcalledthemtoschoolbutalthoughtheincidentcausedseveralconferencesIdon'tthinkthatanybodyeverreallyunderstoodwhatmybrotherwasgoingthrough.We'rejustsupposedtoperformoutstandinglyaswellasalwaysacthonestlybuthowmanyadultscanactuallyliveuptothestandardstheysetforus?Myfatherhasgottencountlesstrafficticketsforparkinginnoparkingzonesorfornotcomingtoafullstopatstopsigns.Andyou'vealwayshearingaboutpeoplewhodon'tfiletheirincomestaxhonestly.Howaboutallthecorruptioningovernment?Successfuladultsoftenacceptdishonestyinordertoachievetheirbusinessgoals.Arekidstheonlyoneswhoaresupposedtobeperfect?Mostofmyfriendshavecheatedontestsinschoolatonetimeoranother.Thekidswhonevercheatedareusuallyeitherafraidofgettingcaughtorjustdon'tknowhowtodoitsafely.Nobodywantstocheat.Butifit'sachoiceofbeinghonestorofgettingabettergrademostkidswilltryforthelatter.Thatmaysoundwrongbutwedidn'tmaketheruleswe'rejusttryingtogetby.1Whatisthebesttitleofthispassage?A.Everyonecanfightacheat!B.Everyonelikestocheat!C.Cheatingisreasonable!D.Noonewantstocheat!2eauthoroweschildren'scheattothefollowingEXPECT.A.parentsB.childrenC.teacherD.examinations3thefifthparagraphtheauthormainlywantstosay.A.someadultscannotliveuptothestandardstheysetforthechildrenB.kidsarealwayssupposedtobeperfectC.hisfatheralwayscheatsinhislifeD.childrenshouldn'tlearnfromsuccessfuladults4Whichofthefollowingistrueaccordingtothispassage?A.Theauthorthinksitischildren'srighttocheatinschool.B.Mostoftheauthor'sfriendslikecheatingonthetestsinschool.C.Theauthorthinksitwrongtocheatinschool.D.Theauthorshowsapositiveattitudetowardsasurprisequizinschool.
现有两份铝分别放入足量的盐酸和氢氧化钠溶液中放出的氢气在同温同压下的体积比为13则这两份铝消耗的盐酸和氢氧化钠物质的量之比为
10分假如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. Myfirsttriptothezoowasyearsbeforeduringanelementaryschoolfieldtrip.ItisanactivityIstillrememberedtothisday.ItwasforthefirsttimethatIhadfoundmesoclosetoanimalsliketigersandlions.Iwouldsaythatthetripwaswortheveryminuteoftimespending.Howeversomefeelthatanimalsshouldnotbekeptincagesandshouldratherbeletoutinthewild.Theythinkkeepinganimalincagesshowsthecruelofhumanbeings.AsfarasIconcernedwithoutzoosmanyofuswouldneverhavethechancetoseehowatigerorlionreallylookslike.
是元素周期表的一部分针对表中的①～⑩中元素用元素符号或化学式填空回答以下问题用序号回答问题的不给分 1①～⑩元素中化学性质最稳定的元素是其原子结构示意图为． 2在③～⑦元素中原子半径最大的元素是其在周期表中的位置为． 3①～⑩中元素的最高价氧化物对应的水化物碱性最强的物质电子式为该物质类型属于化合物“共价”或“离子”． 4②⑦和⑩三种元素非金属性由强到弱的顺序是．
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2017年1月15日全国科学技术名词审定委员会联合国家语言文字工作委员会组织化学物理学语言学界专家确认了117号元素Ts中文名称“”tián．关于Ts的叙述错误的是
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下列关于药品的使用和保存仪器选用正确的是
8分 YoungAmericansAreLessWealthyThanTheirParents ThecostoflivingintheUnitedStatesisgoingupnoteswriterAlissaQuartz.AsisreportedinNewYorkPostQuartzpointstothecostsofhousingeducationandhealthcareinparticular.AtthesametimeanewstudythereportofwhichiscalledTheFadingAmericanDreamfoundthathalfofAmericansborninthe1980sarefallingbehindtheirparentseconomically. Thesefindingsshowthatmanyyoungeradultsareexperiencingdownwardmobility.Inotherwordstheyarenotdoingaswelleconomicallyastheirparentswereatthesameage.TheideaofdownwardmobilityisespeciallytroublingforAmericanswritesRobertSamuelsoninTheWashingtonPost.HesaysmostU.S.citizensbelievethatovertimetheamountofmoneytheyearnwillriseandlifewillgeteasier. AlissaQuartzwroteabookaboutthefinancialdifficultiesofAmericans.InthebookQuartztellsaboutteacherswhoarestrugglingtopayforregularcosts.OnehighschoolteacherdrivesforridesharingserviceUberatnighttoearnmoremoney.Hecorrectsstudents'papersbetweenriders.Acollegeprofessorturnedtogovernmentassistancetofeedherchildandpayforadoctor.Quartzsaysevenlawyersincreasinglycannotearnanincomethatenablesthemtomeettheirneeds.Theproblemofdecreasingincomesintheirfieldismadeworsebydebttheymayhavefromlawschool. Quartzandtheeconomistswhostudiedtheseissuessaymanythingshaveledtolowerincomesanddownwardmobility.Theeconomicrecessionof2007to2009ispartlytoblametheysay.Moderntechnologyalsoplaysapart.Quartzsaysrobotsthreatentoreducetheearningsofhealthcareworkersreportersandpeoplewhoworkatsupermarketsdrugstoresandtaxpreparationservices.InTheWashingtonPostRobertSamuelsonnotedthatpoorschoolsaweakhousingindustryandtoomanygovernmentrulesarealsotoblame. Withallthesethingsandmorepartlyresponsiblewhatisthesolution?Theseexpertssaytheansweriscomplex.Butallpointtooneissuethatneedstobeexaminedeconomicinequality.QuartzwritesthatwhileAmericaisoneoftherichestcountriesintheworlditalsohasoneofthebiggestdividesbetweenthewealthyandthepoor. TheresearchersinTheFadingAmericanDreamstudymakeasimilarobservation.TheysayraisingGDPwillnotsignificantlyimprovetheeconomicsituationofmostAmericans.AhigherGDPmayhelponlythosewhoarealreadydoingwell.InsteadtheeconomistssaytheUnitedStatescouldtrytorepeatsomethingAmericansborninthe1940sexperienced.Asthosechildrengrewuptheyalmostallbenefitedfromabettereconomy. 1TheauthormentionstworeportsinParagraph1inorderto. A.explaintheresultsoftworesearches B.introducehisopinionsabouttheissue C.attractreaders'attentiontohealthcare D.leadtothetopicofdownwardmobility 2What'sthemainideaofParagraph4? A.Thecausesofdownwardmobility. B.Theinfluencesofgovernmentrules. C.Thenegativeeffectsofmoderntechnology. D.TheresultsofeconomicrecessioninAmerica. 3Theauthorindicatesinthispassagethat. A.raisingGDPwillgreatlyhelpthepoor B.Americaneconomyhasabrightfuture C.youngAmericanswillrepeattheirparents'experience D.it'svitaltonarrowthegapbetweentherichandthepoor 4WecanlearnfromthepassagethatinAmerica. A.peoplemissthegoodolddaysinthe1940s B.peoplearesufferingfromaworseeconomy C.peoplearepessimisticaboutfutureeconomy D.peoplecomplainalotabouteconomicchanges
AfterashortvacationwithmyparentsIreturnedtothecountrywhereI'mvolunteering.ThenextdayIwasbackatmydesk.AndIwas1surprisetofindthatthesmilecardsIorderedwhileIwasawayhadarrived.Thoughtsofhowtousekindactstohelpthoseinneedbegandancinginmyhead2mademydayimmediatelylightup.ThefollowingdaysItookasmallpurseandasmilecardwithmewiththeintentionofgivingittosomeonewho3realneededabigsurprise.Marthaisaladyasinglemotheroffour4childwhocleansourofficegivesusteafoodetc.OnedayIfoundherintheofficetouchingherheadinexhaustionassheended5phonecall.AftertalkingwithherIlearnedthatoneofherchildren6sendbackhomefromschoolbecause7non﹣paymentoffeesandthatshehadjustbeenarrangingforthemoney.SoIdecided8helpmyfirsttargetMartha!WhenshewenttogetlunchIleftherthegiftinabagwithhernameasmilecardandabigsmile9drawonthebag.Later10Marthasawmeagainshesaid'Thankyouverymuch!Youmademyday.'
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把一个棱长5厘米的正方体木块放在桌面上占桌面的面积是平方厘米．
8分WhenLinawasawokenbythesoundofthundershewasaloneontheisland.Theairwascoolandbullfrogscroaked.Itwasthatbriefmomentwhenthesummersunhadsetbutthestarshadn'tyetappeared.Linarubbedhereyesandlookedaround. Hello?shecalled.Celia?Marie? Therewasnoresponse. Themoonwasrisingnowsheddinglightontheisland.TheyhadalwayscalleditForgottenIslandbecausenoonebuttheyseemedtorememberitsexistence.Itwasn'tonanyofthemapstheycouldfindandeventheforestrangersdidn'tknowaboutit.Linalovedthattheislandhiddeninaheavily﹣woodedsidestreamoftheriverwasasecretbetweenthethreefriends﹣herCeliaandMarie. ButnowLinawasherealoneanditwasnight.Worsestillitwasherownfault.ComeonLinaletMarierowtheboat.Celiahadsaid.MariewastwoyearsolderthanLinabutshewasahopelessrower.That'swhyLinarefusedandrowedtheboattotheisland.Theargumentthatfollowedtherefusaltooktheusualform.CeliatookMarie'ssideasshealwaysdid.Linahadexplodedandyelledatthemtojustleave.Sotheygotbackintheboatandleft. Aboltoflightningcrossedthedarkenedskyaccompaniedbyadeafeningthunderclap.Thestormwashere.AsthefirstcoldraindropsliddownherneckLina'smindreturnedtohercurrentproblem.Shewasstuckherebyherself.Shejusthopedshedidn'tbecomeasforgottenastheisland.Thethoughtofitsentachill寒意downherback. SuddenlyLinaspottedsomethinginthewater.ItwasaboatandinsideitwereMarieCeliaandMarie'sdadwhowassteeringthroughthefastflowingwaters.AstheboatapproachedtheysawLinawavingandtheworriedexpressionsontheirfacesturnedtorelief. InherexcitementLinajumpedintotheriver.Onlyonceshewasintheicywaterdidsherememberhowfastthewaterwasmoving.Luckilyastrongarmreachedintothewaterandpulledherout.ShesmiledweaklyatMarie'sdadandwithoutawordhuggedCeliaandMarie.Theydidn'tseemtomindbecomingwet. 1Whatcanbeinferredabouttheisland? A.Itisveryneartheocean. B.Itisapopularplaceforboating. C.Itissurroundedbythickforest. D.Ithasneverbeenreachedbyothers. 2WhydidLinagetangry? A.Mariewouldnothelprowtheboat. B.Linawasleftaloneontheisland. C.Mariedidn'tknowhowtorowtheboat. D.CeliasupportedMarieinthedisagreement. 3WhatcausedLinatofeelachill? A.Hershameabouttheunnecessaryargument. B.Thefirstraindropsoftheapproachingstorm. C.Theideathatnoonewouldcometosaveher. D.Thedropintemperatureasthesunwentdown. 4WhopulledLinaoutofthewater? A.Marie'sfather. B.Linaherself. C.Marie. D.Celia.
工业上常用铝土矿主要成分为Al2O3SiO2和Fe2O3等杂质为原料制备铝氢化钠铝氢化钠NaAlH4是有机合成的重要还原剂工艺流程如图 已知SiO2在“碱液”中转化为铝硅酸钠Na2Al2SixO8沉淀． 1过量NaOH溶液溶解铝土矿时为了提高浸出率使所有要提取的金属尽量溶解可采取的措施是．任写一种 2写出Al2O3被过量的NaOH溶液溶解的离子方程式． 3操作1和操作2使用的操作方法是． 4一定条件下往铝中通入纯净Cl2反应会生成填写化学式已知该物质是由分子构成不含离子则相邻原子间形成的化学键为键该物质与NaH反应生成NaAlH4和一种与厨房中常用的调味品成分相同的物质反应Ⅰ请写出反应Ⅰ的化学方程式．
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