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一个正方体棱长为6厘米，它的表面积是 ，体积是 ．
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一个正方体的棱长为6厘米它的表面积和体积相比是
一样大
表面积大
体积大
不能比较
把一个棱长是8厘米的正方体切成棱长是2厘米的小正方体可以得到多少个小正方体它的表面积之和比原来大正
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
一个正方体它的体积是棱长为4厘米的正方体的体积的一半则这个正方体的棱长是______________
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
用12个棱长1厘米的小正方体拼成一个长3厘米宽与高都是2厘米的大长方体再将它去掉一个小正方体如图所示
一个正方体的棱长之和是36厘米它的表面积是平方厘米体积是立方厘米一个正方体的棱长总和是48厘米它的
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在浓硝酸和浓氢氧化钠溶液中均不能溶解的单质是
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
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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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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
能量转化率大氧化剂和还原剂可以不断从外部输入电极产物可以不断输出且能代替汽油作为汽车的动力能持续使用的新型电池为
10.7g氯化铵和足量的氢氧化钙混合后充分加热再将所生成的气体完全溶于水后得50mL溶液计算 1可生成标准状况下的氨气多少升． 2所得溶液的物质的量浓度是多少．
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.
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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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