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金属在生产和生活中有广泛的应用．（1）下列金属制品中，利用金属导电性的是 （填字母序号）．（2）钢铁生锈的条件是 ．（3）工业上用一氧化碳和赤铁矿炼铁反应的化学方程式为 ．（4）利用废旧...
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材料在生产生活中应用广泛下列属于金属材料的是
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金属在生活和生产中有广泛的应用.1下列金属制品中利用金属导热性的是填字母序号.2铁生锈的条件是.3工
金属在生产和生活中有广泛的应用.1下列金属制品中利用金属导电性的是填字母序号.2铁制品在沙漠地区不易
金属在生活和生产中有广泛的应用.1下列金属制品中利用金属导热性的是填字母序号.2铁生锈的条件是.3工
金属材料在生产生活中有着广泛的应用.1大多数金属是人类从矿石中提取的.如用赤铁矿主要成分为Fe2O.
化学在生产和日常生活中有着重要的应用下列说法中不正确的是
铝比铁活泼，但铝制品比铁制品在空气中耐腐蚀
铝热反应不仅被用于焊接钢轨，而且还常被用于冶炼熔点较高的金属
电解AlCl
3
饱和溶液,可制得金属铝
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2
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3
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金属在我们的生产和生活中也具有十分广泛的应用⑴下列金属制品中利用金属导热性的是_________填字
金属在生产和生活中有广泛的应用.1下列金属制品中利用金属导电性的是填字母.2铁制品在沙漠地区不易锈蚀
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Haveyoueverrunintoacarelesscellphoneuseronthestreet?PerhapstheywerebusytalkingtextingorcheckingupdatesonWeChatwithoutlookingatwhatwasgoingonaroundthem.Asthenumberofthisnewspeciesofhumanhaskeptrising.Theyhavebeengivenanewname﹣phubbers低头族. RecentlyacartooncreatedbystudentsfromChinaCentralAcademyofFineArtsputthisgroupofpeopleunderthespotlight.Intheshortfilmphubberswithvarioussocialidentitiesburythemselvesintheirphones.Adoctorplayswithhiscellphonewhilelettinghispatientdieaprettywomantakesselfieinfrontofacaraccidentsiteandafatherloseshischildwithoutknowingaboutitwhileusinghismobilephone.Achainofsimilareventseventuallyleadstothedestructionoftheworld. Althoughtheendingsoundsoverstatedthedamagephubbingcanbringisreal. Yourhealthisthefirsttobeartheeffectandresultofit.ConstantlybendingyourheadtocheckyourcellphonecoulddamageyourneckGuangmingDailyquoteddoctorsassayingtheneckislikearopethatbreaksafterlongtermstretching.Alsostaringatcellphonesforlongperiodsoftimewilldamageyoureyesightgraduallyaccordingtothereport. Butthat'snotall.Beingaphubbercouldalsodamageyoursocialskillsanddriveyouawayfromyourfriendsandfamily.AtreunionswithfamilyorfriendsmanypeopletendtosticktotheircellphoneswhileothersarechattinghappilywitheachotherandthiscreatesastrangeatmosphereBeijingEveningNewsreported. Itcanalsocostyouyourlife.Therehavebeenlotsofreportsonphubberswhofelltotheirdeathsufferedaccidentsandwererobbedoftheircellphonesinbroaddaylight. 1ForwhatpurposedoestheauthorgivetheexampleofacartooninPara.3? A.Toadvertisethecartoonmadebystudents. B.Toinformpeopleofthebadeffectsofphubbing. C.Toindicatetheworldwillfinallybedestroyedbyphubbers. D.Towarndoctorsagainstusingcellphoneswhiletreatingpatients. 2WhichofthefollowingisNOTariskaphubbermayhave? A.Hissocialskillscouldbeaffected. B.Hisneckandeyesightwillbegraduallyharmed. C.Hemightgetseparatedfromhisfriendsandfamily. D.Hewillcausethedestructionoftheworld. 3Whichofthefollowingmaybetheauthor'sattitudetowardsphubbing? A.Supportive. B.Optimistic. C.Opposed. D.Objective. 4Whatmaythepassagetalkaboutnext? A.Measurestoreducetherisksofphubbing. B.Peopleaddictedtophubbing. C.Definitionofphubbers. D.Consequencesofphubbing.
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TakeActionforaBetterWorldVolunteersNeeded Sixmonths'preparationinDenmarkAfricastudiesteamworkcombinedwithsocialworkwithriskgroupteenagers. Sixmonths'communityworkinMalawiinPeopletoPeopleProjectsChildAidHIV/AIDSFigureand TeacherTraining. Qualifications18yearshardworkingandsocialengagement. Pleasecontactusbye﹣mailtakeaction@betterworld.Com. 1WhoissuitabletoworkasaCommunityRepresentativeinYOUTHInternational?. A.Onewhoenjoysworkingwithteenagersfromdifferentcountries. B.Onewhohopestotakeactioninfightingagainstdiseases. C.OnewhohasastrongdesiretoimprovehisorherEnglish. D.Onewhowantstoearnsomepocketmoneyintheprogram. 2WherewillJackavolunteerreceivethetrainingbeforeheissenttoworkinMalawi?. A.InsomelocalofficesintheU.S. B.InanESLorganizationinChina. C.InapreparationprograminDenmark. D.InanexchangestudentcenterinAfrica. 3IfMrs.BlackintheU.S.hopestolearnsomeChineseathomeshemaycontact. A.takeaction@betterworld.com B.ram3462@hotmall.com C.club3864@hotmail.com D.staff@youth.org 4WhatarevolunteersforanexperimentovertheInternetsupposedtodo?. A.Tointerviewpeopleonline. B.Todosomehousework. C.ToofferadviceonChildAid. D.Toprovidelanguageexercises.
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CH4超干重整CO2技术可得到富含CO的化工原料．回答下列问题 1CH4超干重整CO2的催化转化如图1所示 ①已知相关反应的能量变化如图2所示 过程Ⅰ的热化学方程式为． ②关于上述过程Ⅱ的说法不正确的是填序号． a．实现了含碳物质与含氢物质的分离 b．可表示为CO2+H2＝H2Og+CO c．CO未参与反应 d．Fe3O4CaO为催化剂降低了反应的△H ③其他条件不变在不同催化剂ⅠⅡⅢ作用下反应CH4g+CO2g＝2COg+2H2g进行相同时间后CH4的转化率随反应温度的变化如图3所示．a点所代表的状态填“是”或“不是”平衡状态b点CH4的转化率高于c点原因是． 2在一刚性密闭容器中CH4和CO2的分压分别为20kPa25kPa加入Ni/α﹣A12O3催化剂并加热至1123K使其发生反应CH4g+CO2g═2COg+2H2g． ①研究表明CO的生成速率vCO＝1.3×10﹣2•pCH4•pCO2mol••g﹣1•s﹣1某时刻测得pCO＝20kPa则pCO2＝kPavCO＝mol••g﹣1•s﹣1 ②达到平衡后测得体系压强是起始时的1.8倍则该反应的平衡常数的计算式为Kp＝kPa2．用各物质的分压代替物质的量浓度计算 3CH4超干重整CO2得到的CO经偶联反应可制得草酸H2C2O4．常温下向某浓度的草酸溶液中加入一定浓度的NaOH溶液所得溶液中cH2C2O4＝cC2O42﹣则此时溶液的pH＝．已知常温下H2C2O4的Ka1＝6×10﹣2Ka2＝6×10﹣5lg6＝0.8
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某种汽车的购车费用是10万元每年使用的保险费养路费汽油费约为0.9万元年维修费用第一年是0.2万元第二年是0.4万元第三年是0.6万元…以后逐年递增0.2万元．汽车的购车费用每年使用的保险费养路费汽油费维修费用的和平均摊到每一年的费用叫做年平均费用．设这种汽车使用xx∈N*年的维修费用为gx年平均费用为fx． 1求出函数gxfx的解析式 2这种汽车使用多少年时它的年平均费用最小最小值是多少
Everybodysleepsbutwhatpeoplestayuplatetocatch﹣orwakeupearlyinordernottomiss﹣variesbyculture.Fromdatacollecteditseemsthethingsthatcauseustolosethemostsleeponaveragearesportingeventstimechangesandholidays. Aroundtheworldpeoplechangedsleeppatternsthankstothestartorendofdaylightsavingstime.Russiansforexamplebegantowakeupaboutahalf﹣hourlatereachdayafterPresidentVladimirPutinshiftedthecountrypermanentlytowintertimestartingonOctober36. Russia'sotherlatenightsandearlymorningsgenerallycorrespondtopublicholidays.OnNewYear'sEveRussianshavetheworld'slatestbedtimehittingthehayataround330am. RussiansalsogetupanhourlateronInternationalWomen'sDaythedayfortreatingandcelebratingfemalerelatives. SimilarlyAmericans'latenightslatemorningsandlongestsleepsfallonthree﹣dayweekends. CanadagottheleastsleepoftheyearthenightitbeatSwedenintheOlympichockey冰球final. TheWorldCupisalsochieflyresponsibleforsleepdeprivation剥夺TheworstnightforsleepintheU.K.wasthenightoftheEngland﹣ItalymatchonJune15.Britsstayedupahalf﹣hourlatertowatchitandthentheywokeupearlierthanusualthenextmorningthankstosummernightsthephenomenoninwhichthesunbarelysetsinnortherncountriesinthesummertime.ThatwasnothingthoughcomparedtoGermansItaliansandtheFrenchwhostayeduparoundanhourandahalflateronvariousdaysthroughoutthesummertowatchtheCup. Itshouldbemadeclearthatnoteveryonehasadevicetorecordtheirsleeppatternsinsomeofthesenationsit'slikelythatonlytherichestpeopledo.Andpeoplewhoelecttotracktheirsleepmaytrytogetmoresleepthantheaverageperson.Evenifthat'sthecasethoughtheabovefindingsarestillstrikingIfthemosthealth﹣consciousamongushavesuchdeepswingsinourshut﹣eyelevelsthroughouttheyearhowmuchsleeparetherestofuslosing? 1Whatdoestheauthorsayaboutpeople'ssleepinghabits? A.Theyareculture﹣related. B.Theyaffectpeople'shealth C.Theychangewiththeseasons. D.Theyvaryfrompersontoperson. 2WhatdowelearnabouttheRussiansregardingsleep? A.Theydon'tsleepmuchonweekends. B.Theygetlesssleeponpublicholidays C.Theydon'tfallasleepuntilverylate. D.Theysleeplongerthanpeopleelsewhere. 3Whatisthemostprobablereasonforsomerichpeopletouseadevicetorecordtheirpatterns? A.Theyareinvolvedinasleepresearch. B.Theyhavetroublefallingasleep. C.Theywanttogetsufficientsleep. D.Theywanttogotobedonregularhours. 4Whatdoestheauthorimplyinthelastparagraph? A.Sleeplessnessdoesharmtopeople'shealth. B.Fewpeoplereallyknowtheimportanceofsleep. C.Itisimportanttostudyoursleeppatterns. D.Averagepeopleprobablysleeplessthantherich.
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用下列实验装置部分夹持装置略去进行相应的实验能达到实验目的是
OpenLettertoanEditor Ihadaninterestingconversationwithareporterrecently﹣onewhoworksforyou.Infacthe'soneofyourbestreporters.Hewantstoleave. Yourreportergavemeacopyofhisresumeandphotocopiesofsixstoriesthathewroteforyou.Theheadlinesshowedyouplayedthemproudly.Withgreatenthusiasmhetalkedabouthowhefindsissuesapproachesthemandwritesaboutthemwhichtellsmeheisoneofyourbest.I'msureyouwouldhatetolosehim.Surprisinglyyourreporterisnotunhappy.Infacthetoldmehereallylikeshisjob.Hehasagreatassignmentandsaidyourunagreatpaper.Itwouldbeeasyforyoutokeephimhesaid.Heknowsthatthepapervalueshim.Heappreciatestheresponsibilityyou'vegivenhimtakesownershipofhisprofessionandenjoyshisfreedom. Sowhyishelookingforawayout? Hetalkedtomebecausehewantshiseditorstodemandsomuchmoreofhim.Hewantstobepushed challengedcoachedtonewheights. Thereporterbelievesthatgoodstoriesspringfromgoodquestionsbuthiseditorsusuallyaskhowlongthestorywillbewhenitwillbeinwhereitcanplayandwhatthebudgetis. Helongsforconversationswithaneditorwhowillhelphimturnhisgoodideasintogreatones.Hewantssomeonetogetexcitedaboutwhathe'sdoingandtohelphimturnhisstoryideaupsidedownandinsideoutexploringthebestwaystoreportit.Hewantstobemorevaluableforyourpaper.That'swhatyouwantforhimtooisn'tit? Soyourreporterhassetmethinking. Ourbesthopeinkeepingourbestreporterscopyeditorsphotographersartists﹣everyone﹣istowork hardertomakesuretheygetthehelptheyaredemandingtoreachtheirpotential.Ifwecan'tdoitthey'llfindsomeonewhocan. 1Whatdoesthewriterthinkofthereporter?. A.Optimistic. B.Imaginative. C.Ambitious. D.Proud. 2Whoprobablywrotetheletter?. A.Aneditor. B.Anartist. C.Areporter. D.Areader. 3Theletteraimstoremindeditorsthattheyshould. A.keeptheirbestreportersatallcosts B.givemorefreedomtotheirreporters C.beawareoftheirreporters'professionaldevelopment D.appreciatetheirreporters'workingstylesandattitudes
化学与生产生活密切相关．下列说法错误的是
BagsofLove LastyearIwasassignedtoworkatanofficenearmymother'shousesoIstayedwithherforamonth.DuringthattimeIhelpedoutwiththehouseworkandcontributedtothegroceries. AfterlessthanaweekIstartednoticingthatthegrocerieswererunningoutprettyquickly﹣wewerealwayssuddenlyoutofsomething.1wonderhowmymumcouldconsumethemsoquicklyIbeganobservingherdailyroutinefortwoweeks.TomysurpriseIfoundthatshewouldpackapaperbagfullofcannedgoodsandheadouteverymorningataboutnine.EventuallyIdecidedtofollowherand2happenedtrulyamazedme.Shewastakingthefoodtotherefugeecampin3shedistributedittochildren. Iaskedaroundandfoundoutthatmymumwasverywellknowninthearea.Thekidswereveryfriendlywithherandevenlookeduptoherasifshe4theirownmother.Thenit5hitme﹣shywouldshemotwanttotellmeaboutwhatshe6do?WassheworriedabouthowIwouldreactorthatIwouldstop7buythegroceriesifIfoundout? WhenshegothomeItoldheraboutmydiscovery.8shecouldreactIgaveherabighugandtoldhershedidn'tneedtokeepitasecret9me.Shetoldmethatsomeofthechildrenlivedwithanolderladyinashelterwhileotherssleptonthestreets.Foryearsmymumhasbeenhelpingoutbygivingthemwhateverfoodshecouldspare.Iwassoimpressedby10selflessshewas.
Ifyouwanttolearnanewlanguagetheveryfirstthingtothinkaboutiswhy.Doyouneeditfora1reasonsuchasyourjoboryourstudies?2perhapsyouareinterestedinthe3filmsorthemusicofadifferentcountryandyouknowhowmuchitwillhelptohavea4ofthelanguage. Mostpeoplelearnbestusingavarietyof5buttraditionalclassesareanidealstartformanypeople.They6anenvironmentwhereyoucanpracticeunderthe7ofsomeonewho'sgoodatthelanguage.Wealllead8livesandlearninglanguagetakes9.Youwillhavemoresuccessifyoustudyregularlysotrytodevelopa10.Itdoesn'tmatterifyouhaven'tgotlong.Becoming11inalanguagewilltakeyearsbutlearningtogetbytakesalotless. Manypeoplestartlearningalanguageandsoongivenup.I'mtoo12theysay.Yeschildrendolearnlanguagesmore13thanadultsbutresearchhasshownthatyoucanlearnalanguageatany14.Andlearningisgoodforthehealthofyourbraintoo.I'vealsoheardpeople15aboutthemistakestheymakewhen16.Wellrelaxandlaughaboutyour17andyou'remuchlesslikelytomakethemagain. Learninganewlanguageisnever18.Butwithsomeworkanddevotionyou'llmakeprogress.Andyou'llbe19bythepositivereactionofsomepeoplewhenyousayjustafewwordsin20wonlanguage.Goodluck! 1A.technical Bpolitical C.practical D.physical 2A.After B.So C.Though D.Or 3A.literature B.transport C.agriculture D.medicine 4A.view B.knowledge C.form D.database 5A.paintings B.regulations C.methods D.computers 6A.protect B.change C.respect D.provide 7A.control B.command C.guidance D.pressure 8A.busy B.happy C.simple D.normal 9A.courage B.time C.energy D.place 10A.theory B.business C.routine D.project 11A.bored B.fluent C.interested D.devoted 12A.old B.nervous C.weak D.tired 13A.closely B.quickly C.privately D.quietly 14A.age B.speed C.distance D.school 15A.worry B.hesitate C.think D.quarrel 16A.singing B.working C.bargaining D.learning 17A.progress B.mistakes C.cleverness D.clumsiness 18A.tiresome B.hard C.interesting D.easy 19A.blamed B.amazed C.interrupted D.informed 20A.their B.his C.our D.your
常温时向20mL0.1mol•L﹣1的CH3CH2COOH溶液中滴加0.1mol•L﹣1的NaOH溶液溶液的pH与滴加NaOH溶液体积V的关系如图所示．下列说法正确的是
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Pleaseacceptthisgiftin感激ofallyou'vedoneforus.
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