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铝合金是目前广泛使用的合金材料，已知某铝合金由Al、Fe、Cu三种金属构成，为了测定各种金属含量，取30g合金样品与盐酸反应，恰好消耗浓盐酸（质量分数36.5%）100g．另取30g合金样品与氢氧化...
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由于铝合金平顶的龙骨必须用铝合金材料制成故造价很高
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航空器上使用的铝合金板材通常是什么类型的材料
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硬铝合金
超硬铝合金
铸造铝合金
锻铝合金
汽车发动机目前广泛采用的活塞材料是铝合金铝合金的优点是
钢材与铝合金材料接触部位电化腐蚀超过时更换铝合金结构敞车
0.2
0.25
0.3
0.5
车体结构的新型材料主要采用______
中空铝合金材料
铸铝合金
不锈钢
耐候钢
铝合金是目前广泛使用的合金材料已知某铝合金由AlFeCu三种金属构成为了测定各种金属含量取12.5g
哪一种铝合金属于铸造铝合金
AL－Mg合金
AL－Zn合金
AL－Cu合金
AL－Si合金
下列减磨合金材料宜用于薄壁轴瓦的是
锡基白合金
高锡铝合金
铜铅合金
铅基白合金
下列材料中不属于变形铝合金
硬铝合金
超硬铝合金
铸造铝合金
锻铝合金
活塞广泛采用的是的铝合金材料
铝合金是目前广泛使用的合金材料已知某铝合金由AlFeCu三种金属构成为了测定各种金属含量取12.5g
下列铸造铝合金中强度高密度小有良好的耐蚀性但铸造性能不佳耐热性不良的是
Al-Mg铸造铝合金
Al-Si铸造铝合金
Al-Cu铸造铝合金
Al-Zn铸造铝合金
下列材料中不属于变形铝合金
锻铝合金
锻造铝合金
超硬铝合金
硬铝合金
2024铝合金是一种什么铝合金
AL－Mg合金
AL－Zn合金
AL－Cu合金
AL－Si合金
铝合金主要有超硬铝合金和铸造铝合金四种
硬铝合金和软铝合金
防锈铝合金、硬铝合金
超硬铝合金和耐磨铝合金
特殊铝合金和普通铝合金
7075铝合金是一种什么铝合金
AL－Mg合金
AL－Zn合金
AL－Cu合金
AL－Si合金
装饰工程中用得较多的铝合金材料有
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铝合金龙骨。
依据文章内容回答下列问题铝合金是工业中应用最广泛的一类有色金属结构材料在航空航天汽车机械制造船舶及化
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Almost10yearshavepassedsinceChinaappliedanationwidebanontheuseofplasticbagsforfreeandbannedtheproductionsaleanduseofenvironmentalunfriendlybags. TheJune1st2008banhasfailedtoremoveplasticbagsthinnerthan0.025millimetersfromthemarketwhicharestillgivenawayfreeatroadsidestallsandsmallshops.TheyarejustasmallpartofChina'splasticbagproblem.Largesupermarketsanddepartmentstoreschargeforthickerplasticbagsbutthefeeof0.2yuanor0.3yuanistoolowtostopcustomersfromusingthem.Therapiddevelopmentofonlineshoppingandfooddeliveryservicesmeansthecountryisundergreatpressuretodealwithitsincreasingplasticwaste. Thegovernmentrecentlypromisedtoexplorenewwaystoreducetheplasticwasteespeciallytheonlinesellersandtakeoutfoodwastepackaging.Thelessonsofthepastneedtobemadefulluseofforanynewmeasurestobeeffective. Thebanonultrathinplasticbagshasfailedbecauseoflax不严格的lawperformance.Alsomany oftheso﹣calledbiodegradable可生物降解的plasticbagsarenotreallybiodegradableandcosttwotothreetimesasanon﹣biodegradablebagwhichpreventscost﹣sensitivebusinessesfromusingthem. Ithasbeenprojectedthatby2050theamountofplasticintheoceanswilloutweighallthefish.Anditisworthbearinginmindthatasitbreaksupmicroplasticparticlescanenterthefoodchain.Itisnotonlybusinessesthatneedtochangetheirbehavioreffortsmustbemadetoraiseconsumers'awarenessoftheconsequencesofusingplasticbags. 1Whatdoweknowaboutthebanmentionedinthispassage? A.Itstillworkswellnowadays. B.Theeffectofitremainstobeseen. C.Itstopstheproductionofplasticbags. D.Ithascausedgreatdamagetotheoceans. 2Accordingtotheauthor'sopinionshouldberesponsibleforthehealthyenvironment. A.thegovernment B.businesses C.consumers D.everyone 3Whatmadetheplasticwasteproblemmoreseriousaccordingly? A.Poorlawperformance. B.Productionofthenewbags. C.Onlineshoppingandfooddelivery. D.Communityawareness. 4Whichofthefollowingmightbethebesttitleforthispassage? A.PlasticWaste B.LaxLawPerformance C.TheDisadvantagesofUsingPlasticBags D.ReducingPlasticWasteIsSharedResponsibility
现有氯化钠和碳酸钠的混合物24.4g为了除掉其中的碳酸钠配制氯化钠溶液李华同学将该混合物放入40g水中再向其中加入40g盐酸溶液恰好完全反应得到100g溶液求所得溶液中溶质的质量分数．
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TheCostofDishonesty DavidbeganstudyinginGermanytwoyearsago.Thecollegewasalittlefarfrom1helivedsohehadtotakethe2everyday.Thiscleverstudentsoonfounditwas3toescapebuyingsubwaytickets4heoftenwentandreturnedwithoutaticketto5money.Asaresulthehadbeencaughtwithno6inthesubwayfourtimesbuthe7tookthemtoheart.Hethoughtwhatheshouldpaymoreattention8washisstudy.Hedidworkveryhardinthelasttwoyearsandgraduatedwith9gradesamonthago. EveryoneincludingDavid10thoughthewouldgetagoodjobeasilyinGermanyandhaveabright11.Hewenttoabiglocalcompany12.Buttohissurprisehewasnot13givenhischanceforaninterview!Hethenwentto14famouscompanyonlytoreceivethesametreatment.Whenhewas15athirdtimehecouldn't16telephoningthecompanytoaskwhytheydidn't17him.TheanswerwassimpleWedon'tofferjobsto18peopleinGermany! Beingdishonestmaybringussomethingusefulsometimesbutthetruthwill19soonerorlaterandthecostishigh.Soremember20isthebestpolicy策略. 1A.which B.that C.where D.what 2A.bus B.car C.plane D.subway 3A.easy B.difficult C.free D.worth 4A.or B.so C.and D.but 5A.waste B.spend C.save D.cost 6A.ticket B.money C.cost D.pay 7A.never B.often C.sometimes D.always 8A.for B.in C.into D.to 9A.interesting B.disappointing C.poor D.amazing 10A.him B.himself C.his D.he 11A.result B.view C.future D.life 12A.confidently B.actively C.sincerely D.willingly 13A.only B.even C.just D.still 14A.other B.one C.another D.either 15A.refused B.accepted C.doubted D.requested 16A.imagine B.prefer C.enjoy D.help 17A.command B.want C.recognize D.vote 18A.reliable B.devoted C.dishonest D.lazy 19A.giveup B.breakin C.comeout D.keepon 20A.truth B.honesty C.dishonesty D.principle
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AMalianimmigrant移民whohasbeenpraisedasaheroforsavingasmallboythatwashangingfromabalconyinParisistobemadeaFrenchcitizenforhisselflessactofcourage. MamoudouGassamawonwidespreadpraiseafterclimbingtheoutsideofthebuildingtosavethefour﹣year﹣oldchild.Avideoshowedhimbeingcheeredonbypeopleashepulledhimselffrombalconytobalconytothefourthfloor.GassamawasverysoongrantedameetingattheElyseePalacewiththeFrance'sPresidentwhosaidGassamawouldbemadeacitizen.HethankedMr.Gassamagavehimamedalforcourageandsaidhewouldalsobeofferedaroleinthefireservice. MrGassamasaidhehadbeenwalkingpastwhenhesawalotofpeoplegatheredinfrontofthebuilding.HetoldPresidentMacronIjustdidn'thavetimetothink.Iranacrosstheroadtogoandsavehim.Hesaidthattheboywascryingwhenhepulledhimtosafetyandhehadalsosufferedaninjuredfoot.Firefightersarrivedtofindthechildhadalreadybeenrescued. It'ssaidthattheboy'sparentswerenotathomeatthetime.Thefatherhasbeenquestionedbypoliceonleavinghischildunattended.Theboy'sfatherwasarrestedandtoldpolicehehadlefthissonalonetogoshoppingandreturnedhomelaterthanplannedbecausehewasplayingarealitygameonhissmartphone.ThemotherwasnotinParisatthetimeitisbelieved. 1MrGassamawasmadeaFrenchcitizenfor. A.climbingupthefourthfloor B.savingthelittleboy C.puttingthefireout D.savingthepresident 2Theboy'sfatherwasarrestedbecause. A.hewaslostinthegame B.hedidn'tlivewithhiswife C.hewentshoppingbyhimself D.helefthis4﹣year﹣oldchildaloneathome 3Wherecanwereadthispassage? A.Inanovel. B.Onanewspaper. C.Onanadvertisement. D.Fromabiography.
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USprivaterocketcompanySpaceXhasannouncedthattwoprivatecitizenshavepaidtobesentaroundtheMoon.Themissionisplannedforlate2018.SpaceXCEOElonMusksaidThisgiveshumansanopportunitytoreturntodeepspaceforthefirsttimein45years. Thetwounnamedpeoplewillflyaboardaspaceshipwhichissetforitsfirstunmannedtestflightlaterthisyear.Theco﹣operationofAmerica'sNASAspaceagencyhadmadetheplanpossible.Mr.MusksaidThetwopassengerswilltravelfasterandfurtherintothesolarsystemthananybeforethem.LiketheApolloastronautsbeforethemtheseindividualswilltravelintospacecarryingthehopesanddreamsofallhumankinddrivenbytheuniversalhumanspiritofexploration. Weexpecttoconducthealthandfitnesstestsaswellasbegininitialtraininglaterthisyear.Thefirstmissionwouldbeunmannedandthenextone﹣withcrew﹣wasexpectedinthesecondquarterof2018therichbusinessmanandinventorsaidThefirstpassengersareenteringthiswiththeireyesopenknowingthatthereissomeriskhere.They'recertainlynotchildishandwe'lldoeverythingwecantoreducethatriskbutit'snotzero. ThespacetouristswouldmakeacirclearoundtheMoonscanningthelunarsurfaceandthengoingwellbeyond.Howeverthemissionwillnotinvolvealunarlanding.IfNASAdecidedtotakepartinalunarfly﹣bymissionthentheagencywouldhaveprivilege优先权.Mr.Musksaid.TheUShasnotsentastronautstotheMoonsincetheearly1970s. 1Whichofthefollowingstatementsistrueaccordingtothetext? A.Thetwotouristscan'taffordtoflyaroundthemoon. B.Spacetravelsarerootedinthespiritofhumanexploration. C.Initialtrainingisexpectedtobeconductedatthebeginningof2018. D.Thetwotouristsareexpectedtoflyataslowspeed. 2Theagencyhasprivilegebecause A.itneedsco﹣operationwithMr.Musk B.ithasprevioustechnicalskills C.itwillbeabletoremovealltherisks D.ithastomakemoneyforresearch 3Wherecanyoumostprobablyreadthetext? A.Inatextbook. B.Inasciencefiction. C.Inatravelbrochure. D.Onanewswebsite. 4Whatcanbeasuitabletitleforthetext? A.TheComingMoonTripofTwoPrivateCitizens B.AnOpportunitytoExploreSpacefortheFirstTime C.APaidTripPlannedbySpaceXto'LandontheMoon D.TwoUnmannedMissionsofCirclingaroundtheMoon
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DearbornHeightsMichigan﹣2.7millionchildrenunder18haveaparentinprisonandwomenputinlocalprisonsarethefastestgrowingpopulation.ShawnaReynoldshasseensomeofthosewomenupclosewhileworkinginthecorrectionssystem劳教所for17yearsandshewasencouragedtotrysomethingdifferent. AftersevenyearsofeducationandcollectingasmuchmoneyasshecouldShawnacreatedAboutFaceCourseCorrection﹣aone﹣yearrehabilitationprogram康复项目thatoffersamorepersonalwaytohelpnon﹣violentwomenprisoners.TheprogramincludesclassesforwomentofinishtheireducationfindajobandSoon.Youcan'texpectpeoplewhohavebeeninprisontostayinprisonShawnasays.YOUwantthemtobehelpfulpeoplebutifyouarenotgoingtohelpthemit'snotgoingtohappen. ThewomenlivefreeforayearinahouseinDearbornHeightsMichigan.Womenlike20﹣year﹣oldJenniferDouglaswhodroppedoutofschooltookdrugs__andhasspentyearsinandoutofprison.ShesaysIwasdoingthingsIwouldneverhavethoughtIwoulddoinmywholelife.BecauseofAboutFaceJennifer'slifeischanging.EveryoneisstartingtotrustmeagainandproudofmeandwhatI'mdoingshesays.It'shelpedmealot.Ithaskeptmeontherighttrack. TherearemanyotherwomenlikeJennifer.Everywoman'sstoryisdifferentbuteachwomanisimportant.AndShawnaisdeterminedtobreakthecycleandhelpthemturntheirlivesaround.Sheisusingherownmoneyanddonationstopayforthehouseandthisprogram.IfyouwouldliketodonatepleasevisittheirGoFundMeaccounthere. 1ShawnasetupAboutFacetohelpwomenwhohavebeeninprison. A.livemorehappily B.becomenon﹣violent C.escapefromprison D.goontherighttrack 2ShawnaReynoldscanbedescribedas. A.different B.educated C.proud D.warmhearted 3Thispassagemostprobablycomesfrom. A.theInternet B.amagazine C.anewspaper D.aposter 4What'sthewritingpurposeofthepassage? A.Tocollectsuggestionsfortheprogram. B.TotellastoryaboutJenniferDouglas. C.TointroduceShawnaandherprogram. D.ToshowShawnahasbeenintrouble.
目前市面上有一种新型饭盒“即热饭盒”其原理是在饭盒底部有两层一层存放水另一层存放镁和铁的混合物使用时打开隔离层即发生以下反应Mg+2H2O＝X+H2↑请根据以上信息回答下列问题 1已知X是一种碱则X的化学式是 2上述化学反应属于填写基本反应类型
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将下列固体分别放入水中溶液温度明显降低的是
英语课上老师要求同桌同学相互修改作文.假设以下小作文为你同桌所写请你对其进行修改.文中共有10处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. 增加:在缺词处加一个漏词符号^并在此符号下面写出该加的词. 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. 3.必须按答题要求做题 Akindoflittlecarmaysomedaytakeaplaceoftoday'sbigones.Ifpeopledrivesuchcarsinthefuturetherewilllesspollutionintheairandmorespacesforparkingcarsincities.Thestreetswillbelesscrowd.Anddrivingwillbesafeastheselittlecarscangoonly65km.perhour.Howeverthelittlecarswillbefineforgettingroundacitysotheywillnotbeusefulforlongtrips.Ifbigcarswerestillusedalongwiththesmallonestwosetsofroadsthatwillbeneededinthefuture.Onesetisforthebigfastcarsandtheanotherfortheslowsmallones.Whichisbelievedthatmorepublicresourceswillbewasted.
ACanadianwomanwholostherdiamondring13yearsagowhilecleaninghergardenonthefamilyfarmiswearingitproudlyagainafterhewdaughter﹣in﹣lawpulleditfromthegroundoracarrot. MaryGrams84saidshecan'tbelievetheluckycarrotactuallygrewthroughandaroundthediamondringshehadlonggivenuphopeoffinding.ShesaidshenevertoldherhusbandNormanthatshelosttheringbutonlytoldherson.Herhusbanddiedfiveyearsago. IfeelgladandhappyGramssaidthisweek.Igrewintothecarrot.Ifeelitamazing Herdaughter﹣in﹣lawCalleenDaleyfoundtheringwhilegettingcarrotsinforsupperwithherdogBillyatthefarmnearArmenaAlbertawhereGramsusedtolive.Thefarmhasbeeninthefamilyfor105years.DaleysaidwhileshewaspullingthecarrotsandnoticedoneofthemlookedstrangeShealmostfedittoherdogbudecidedtokeepitWhenshewaswashing;thecarrotsshenoticedtheringandspoketoherhusbandGrams'sonaboutwhatshehadfound. TheyquicklycalledGrams.ItoldherwefoundherringinthegardenShecouldn'tbelieveitDaleysaid.Itwassostrangethatthecarrotgrewperfectlythroughthatring. GramssaidshewantedtotrytheringonagainaftersomanyyearsWithherfamilylookingonshewashedtheringwithalittlesoaptogetthedirtoff.Itmovedonherfingeraseasilyasididwhenherhusbandgaveittoher. Wewerelaughingshesaid.Itfits.Aftersomanyyearsitstillfitsperfectly. 1HowoldwasGramswhenshelostherdiamondring? A.13. B.71. C.84. D.105. 2Whofoundthewoman'slong﹣lostdiamondring? A.MaryGrams. B.Norman. C.ColleenDaley. D.Billy. 3Thispassagemainlytellsusthat. A.aCanadianwomanlostherring B.along﹣lostringwasfound C.thefamilyfarmhasalonghistory D.astrangecarrotwaspulled
假定你是李华你的外教老师Mr.Brown即将回国请你给他写一封感谢信.内容包括: 1.表达感激之情; 2.回忆他在英语学习方面给你的帮助; 3.祝他回国旅途愉快. 注意:1.词数80左右; 2.可以适当增加细节以使行文连贯.
下列关于二氧化碳的用途描述错误的是
JohnSmithwasawriterwhowrotedetectivestoriesformagazinesthoughheneverdealtwithcriminals.Oneeveninghecouldnotfinishanendforastory.Hesatinhisstudybuthehadnoideas.Sohedecidedtogotothecinema. Whenhecamebackhefoundthathehadhadavisitor.Someonehadbrokenintohishouse.Thevisitorhadhadadrinksmokedseveralofhiscigarettesandhadreadhisstory.Thevisitorlefthimanote. IhavereadyourstoryandIdon'tthinkitisverygood.Pleasereadmysuggestionsandyoucanfinishit.BythewayIamathief.I'mnotgoingtostealanythingtonight.ButifyoubecomeasuccessfulwriterIwillreturn. Johnreadthethief'ssuggestions.Thenhesatdownandwrotetherestofthestory.Heisstillnotasuccessfulwriterandheiswaitingforhisvisitortoreturn.Beforehegoesoutintheeveninghealwaysleavesahalf﹣finishedstoryinhisstudy. 1Johnwenttothecinemabecause. A.hewastootired B.hewantedtolookforathief C.hecouldnotfinishhisstoryandhopedtogetsomeideas D.hewantedtoenjoyhimselfinthecinema 2ThevisitorcametoJohn'shouseinorderto. A.stealsomething B.readthestory C.haveadrink D.visitthewriter 3Thevisitor. A.stayedinJohn'shouseforanight B.tooksomeofJohn'sthingsaway C.leftJohnsomeadvice D.wasagoodfriendofJohn's 4Johnwouldliketo. A.haveatalkwithhisvisitor B.getmoreideasfromthevisitor C.makefriendswiththevisitor D.catchthevisitorandtakehimtothepolice
有XYZ三种金属把Y投入XNO32溶液中Y表面有X析出把X投入ZNO32溶液中X表面有Z析出．XYZ三种金属的活动性由强到弱的顺序是
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