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信息系统的组装测试中模块自顶向下的组合方式如下图所示按照先深度后宽度的增量测试方法测试顺序为
M1→M2→M4→M3→M5→M6
M1→M2→M3→M4→M5→M6
M4→M5→M6→M2→M3→M1
M1→M2→M4→M5→M6→M3
计算题已知铺贴花岗岩的水泥砂浆体积比为14求以重量计的水泥和砂子的用量砂的空隙率为32%砂的表观密度
箱包生产企业工人接触苯的情况为10mg/m3接触3h15mg/m3接触1h8mg/m3接触4h则该工
15.0mg/m3
9.6mg/m3
11.0mg/m3
8.0mg/m3
计算题检验某普通减水剂坍落度相同基准混凝土用水量为205㎏/m3受检混凝土用水量为195㎏/m3计算
生产性毒物按对人体危害程度分类为1极度危害
空气中水分含量约为空气
3-30g/m3空气
2-20g/m3空气
4-40g/m3空气
计算该吹填工程的吹填设计工程量不考虑固结与搅松
水的重度γ=9800N/m3试计算3m3水的重量
已知某工程的混凝土直接费为420元/m3间接费率为12%利润率为4%税率为3.41%以直接费为计算基
486.44
503.54
503.81
505.90
硫回收装置液硫贮槽中H2S的含量一般为
1.5×10-4m3气/m3液
1.7×10-4m3气/m3液
2×10-4m3气/m3液
2.5×10-4m3气/m3液
计算题根据图所示尺寸计算该建筑物的室内地面面层工程量墙厚240门宽M11.20mM20.90mM31
已知一管道的规格为Ф325*7长度为10km请计算该管道的水容积是
3.04(m3)
0.304(m3)
30.4(m3)
以上都不正确
某工程的AB两项土方工程工程量均为16万m3合同单价均为16元/m3 实际完成工程量超过15%以上时
计算题某水泥厂的无组织排放监测中在参照点M以等时间间隔采集四个样品测定浓度分别为0.25mg/m30
计算题检验高效减水剂坍落度相同基准混凝土用水量为205㎏/m3受检混凝土用水量为180㎏/m3计算其
计算如图所示地基中的自重应力已知细砂γ=17.5kN/m3ds=2.66w=20%黏土γ=18kN
庆阳市河川径流总量亿m3其中自产水亿m3入境水亿m3以河川自产径流量亿m3计算庆阳市人均占有水资源m
试计算材料消耗定额在某操作项目中某种材料的净用量88.725kg/m3合理操作损耗量是0.91kg/
已知某工程的混凝土干脆费为420元/m3间接费率为12%利润率为4%税率为3.41%以干脆费为计算基
486.44
503.54
503.81
505.90
计算某全室空调的工业车间的最小新风量已求出室内人员所需的最小新风量为M1补充设备局部排风所需新风量为
M1,M2,M3,M4四者中的最大值
M1,M2,M3,M4四者之和值
(M1+M2),(M3+M4)二者中的较大值
M1,(M2+M3+M4)二者中的较大值
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Intoday'sworldmanypeopleseemtobe1hungerformoney.Moneydoeshaveitsmostusefuleffectsonthepoor.2evenifapersonhasalreadygotplentyofmoney3happycan'tbeboughtbymoney.Ifmoneywerebeginningallmillionaires4havereallovetruefriendshipgoodhealthandalonglife.Howeverthisisnotalwayscorrect.Since5beginningoftimenothreewordshaveeverinvitedmore6pleasedthan'Iloveyou'.Butcanlovebebought?I'mafraidnotLove7meantogivenottotake.Toeverypersonhealthandalonglifeareboughtwithmoney?Theansweris'No'.Ofallthelongest8lifepeopleintheworldfewofthemaremillionaires.Truefriendshipcan'tbeboughteitherinaworldwheremoneyis9dreamtoomuchitcancausebrotherstoquarrelmarriagetoendloverstohateand10strangetofight.Nomatterhowmuchmoneyyouhaveitisstillnotenoughtomakeahappypersonifyouhavenoonetolaughwithnoonetocryfor.
下列实验方法能达到实验目的是
Theaccidentwhichleft15peopleonboarddeadifboththeangryfemalepassengerandthebusdriverhadkeptcalm. A.shouldhaveavoided B.shouldbeavoided C.couldhaveavoided D.couldhavebeenavoided
下列有关物质用途的说法正确的是
DevonGallagheracollegegraduatefromPhiladelphiawantstheworldtoknowexactlywhereshe'sbeenduringherworldwidevacationinaspecialway.Thetravelerwhowasbornwithabonediseasehadherrightlegamputated截肢attheageoffour.AlthoughtheamputationcausedsetbacksforGallagherearlyonshenowseesitasnothingshortofinspirationforlivingherbestlife.Tospreadthatmessage.Gallagherhastakentosocialmediawhereshesharesphotosofhertravelsacrosstheglobebutinsteadofsimplyusingageo﹣tagshewritesherlocationacrossherartificiallegbeforetakingapicture.NowshehasbeentakingpicturesacrosstheContinentwhichshowhercyclingoverthecanalinAmsterdamrelaxingonawalloverlookingthecityofBarcelonaposingwithawaffleinBrusselstakinginthespectacularParthenontempleinAthensandenjoyingarivercruiseinBudapestallwiththewell﹣knownlocationswrittenonherartificialleg.'IgetanewlegeverytwoyearsandIcanchoosethedesignonit.OnedayIhadasuddenthoughttogetachalk﹣board'Gallaghersaid.'Mymumandgrand﹣motherweren'ttookeenontheideabutmyfriendsthoughtitwasgreatandtoldmetogoforitsoIdid.'Gallaghersaidpeopleoftenstarewhenshe'swritingonherlegbutonceshesharesthephotosshereceivesonlypositivefeedback'Myleghasn'tstoppedmefromdoinganythingI'vewantedtodo'shesaid.'Idon'tknowifit'smydeterminationtoprovetomyselfthatIcandoitbutregardlessI'vebeenabletokeepupwithmypeersandleadaprettygreatlife.'Gallaghershowsusthatyoushouldneverletanythingstandinthewayofyourdreams.Andiflifegivesyouanartificiallegmakeart.1WhatmessagedidGallapherwanttospreadinherspecialway?A.Sheenjoyshertravellingacrosstheglobe.B.Shesufferslittlefromherlegsamputation.C.shelooksonhermisfortuneasanotherformofblessing.D.Shehasexactlyfalleninlovewithpostingphotosonline.2Whatdoestheword'which'underlinedinparagraph4referto?A.thecontinentB.thepicturesC.thelegD.thelocation3Gallaphercanbestbedescribedas.A.helpfulandambitiousB.friendlyandgenerousC.determinedandcreativeD.independentandsensible4Whichofthefollowingmightbethebesttitleforthetext?A.NeverTooLatetoshareB.ASpecialArtificialLegC.AnOutstandingPhotographerD.Gallagher'sSummerHolidays
已知反应2CO2+6H2CH2═CH2+4H2O可用于合成烯烃.下列有关该反应的说法错误的是
Youdidit!Yousurvivedthepassageoftimeand1ittoanotheryear.Pleaseenjoythemomentof2becausebeforeyouknowit2019willbecomejustasexhaustingandweird3thereAREsomefascinatingsignificantentertainingandpromisingthingscomingdowntheroadthatare4tobebrightspotsnomatterwhat20195.Let'senjoythemtogether.EveryyeartheClevelandClinic6themostimportantmedicaladvancementsforthecomingyearandatthetopoflistfor2019ispain7therapies疗法.Soexpectmoreofthesebreakthrough.Firstcamelovethen8andnowPrinceHarryandprincessMeghanare9theirfirstbaby.WEcanlookforwardtoabeautiful10totheroyalWindsorlinesometimeinthespringwhenthe11datecomes.Alsoexpect2019tobetheyearwhen3Dprintingreallyreallycomesintothe12.We'retalkingabout3Dbioprintinginthe13fieldadvanced3Dmetalprintingandevenmoreaccessible3Dprintingathome.JapanwillbemakinghistorywhenEmperorAkihito14inApril.HissonCrownPrinceNaruhitowillimmediatelytakeupthethrone王位inMay.Ifmoviesareyour15'AvengersEndgame'willbeoneofthemost16filmsoftheyearandit's17todropinApril.Butdon'tforgetaboutCaptainMarvelanotherhotDisney/Marvelpropertythatwill18intheatresinMarch.Areyoureadytohaveyoursoulabsolutely19bysomeamazingtelevision?Thefinalseasonof'GameofThrones'20inAprilsoanyGOTfanyouknowisgoingtobeawreck失去健康的人forafewmonths.1A.made B.managed C.got D.took2A.appreciate B.creation C.relaxation D.determination3A.However B.Therefore C.Besides D.Otherwise4A.adequate B.bound C.desperate D.reluctant5A.adopts B.advocate C.brings D.blesses6A.releases B.relieves C.reveals D.reserves7A.assessment B.judgement C.management D.development8A.friendship B.marriage C.admiration D.closeness9A.educating B.delivering C.expecting D.raising10A.attraction B.attention C.addiction D.addition11A.due B.sure C.done D.final12A.minimum B.margin C.majority D.mainstream13A.magical B.historical C.education D.medical14A.steppeddown B.tookdown C.letdown D.brokedown15A.matter B.thing C.issue D.topic16A.applied B.attached C.anticipated D.medical17A.driven B.adapted C.set D.advised18A.launch B.shoot C.land D.film19A.reserved B.rocked C.quaked D.honoured20A.drops B.approaches C.appeals D.returns
下列过程吸收热量的是
紫水晶在西方国家代表着“爱的守护石”其主要成分SiO2属于
Itisoftendifficultforfarmerstoidentifydiseasesquicklyenoughtoprotecttheircropsandthoseonneighboringfarms.Nowsomefarmersareusingasimpledevicedirectlyinthefieldtofindvirusesbeforetheyspread.InTanzaniaseveralvirusesareathreattocassavacrops.Farmersstruggletoidentifythediseasesinanurgentefforttoavoidseverecropdamage.Thediseaseidentificationprocessisoftendifficultwhenfarmersareactingontheirown.Iftheydonotknowwhatisattackingtheircropstheycannotdecidethebestwaytofightthedisease.AdevicefromBritishtechnologycompanyOxfordNanoporeischangingthat.ThedeviceextractsdeoxyribonucleicacidbetterknownasDNAfromplants.DNAisthecarrierofgeneticinformationinnearlyalllivingthings.Thedevicehelpsfarmersidentifywhatisharmingtheircropssotheycanchangetomoreresistantcrops.LauraBoykiniswiththeUniversityofWesternAustraliaandalsoworkswiththeCassavaVirusActionProject.ShebroughtthedevicetoaTanzanianfarmownedbyAshaMohamed.Shesaid'WeareherecollectingleafpunchesfrominfectedmaterialtotesttodoaDNAextractionandthenstartsequencing排序inthefield.'ThetestingidentifiedanumberofvirusesinthecassavafieldsnearMohamed'sfarm.Theprocessalsodiscoveredthatplantsconsideredresistanttodiseasehadaverylowvirallevel.OncetheviruseswereidentifiedAshaMohamedwasgiventwokindsofseedsthatareresistanttothediseases.InanothercaseDNAwascollectedfromapawpawtreefarminKenya.WiththattestthetechnologywasabletoidentifydiseasesaffectingNaomiMumo'scrops.NaomiMumosaid'AllmypawpawwereaffectedbyadiseaseandIdidn'tknowwhatkindofdiseaseitwas.ButnowIhavepeoplewhohaveidentifiedthediseaseusingnewtechnologyandwithinaveryshorttime.SoI'mveryhappy.'Thespeedatwhichfarmersidentifydiseasescanmeanthedifferencebetweenthesuccessorfailureonlargeareasofcropland.NowtheuseofsuchsimpleandeasilytransportableDNAsequencingdevicesismakingthatpossible.1What'sthemainideaofthewholepassage?A.FarmersInTanzaniastruggletoidentifythediseasesintheircropsB.HowLauraBoykinhelpedAshaMohamedtoidentifytheviruses.C.DNAsequencingdevicehelpsfarmerstofindvirusesandidentifythediseasesintheircropsquickly.D.ADNAsequencingdevicehelpsfarmerstoidentifythediseasesandkeephealthy.2Whichofthefollowingbestexplains'extracts'underlinedinparagraph2?A.producesB.createsC.refusesD.gets3WecaninferfromthepassagethatNaomiMumoiswiththeDNAsequencingdevice.A.relaxedB.satisfiedC.disappointedD.annoyed4Whichofthefollowingisnottrueaccordingtothepassage?A.Farmersoftenhavedifficultyinidentifyingdiseasesintheircropsquicklybythemselves.B.DNAcarriesgeneticinformationinnearlyalllivingthings.C.BothAshaMohamedandNaomiMumoarefarmersinTanzania.D.Iffarmerscanidentifydiseasesintheircropsquicklytheycanprotecttheircropsandsucceedonlargeareasofcropland.
下列物质的制备能够成功的是
challengesinChinascar﹣sharingeconomysharedmobilitystillhasapromisingfuture. A.Despite B.Besides C.Concerning D.Regarding
BritainandFrancearetwoimportantcountriesinEurope.Theyareneighborsseparatedonlybythe20﹣mileseawayoftheEnglishChannel.AndformostofthetimethatthetwocountrieshaveexistedtheFrenchandtheBritishhavebeenrivalsorevenenemies.Oneconflictbetweenthetwocountrieslastedover100yearsandtheBritishandFrenchwereatwarthroughthe18thcentury.Thereisnofightingnowofcourse.Butthereisstillastrongsenseofrivalry敌对betweenthetwonations.That'swhyarecentsurveyintheUKcausedamajorshock.Itrevealed揭露thatonethirdoftheBritishpeoplewouldliketoliveinFrance.Italsoshowedthattwenty﹣onepercentofBritishpeoplewouldactuallyprefertohavebeenborninFrance.Manyreasonsweregiven.FrancehasabetterclimateandamorerelaxedlifestylewithsomeofthelongestholidaysinEurope.Itisthoughttohavebetterpublicservicesineveryareafromhealthtotransport.PeopleinFranceworkshorterhoursandenjoylongervacations.Andthinkofthefoodandwine!Estimates估计ofthenumbersofBritonslivinginFrancerangefrom100000tohalfamillion.Butitisnotone﹣waytraffic.Around15000FrenchpeopleperyearcometoliveinBritainmainlysettlinginLondon.TheyareattractedbyhigherpayinBritainlowertaxesamoredynamiclifestyle.Nowitseemsthatpeoplecangototheplacethatsuitsthembest.1WhydosomeBritishpeopleliketoliveinFrance?A.Theypreferthelongerholidaysthere.B.EnglandhastheworstfoodinEurope.C.FranceisnotfarawayfromEngland.D.Thetwocountrieshavealwaysbeenfriends.2SomeFrenchpeoplemainlysetinLondonbecause.A.theylikebetterthemoredynamiclifestyleB.theythinktherearebetterpublicservicesinitC.theyliveinFranceforalongtimeD.theycanworkshorterhoursthere3Whichwouldbethemostidealwaytoliveforpeopleinbothcountries?A.WorkandliveinFrance.B.WorkandliveinLondon.C.WorkinLondonandliveinFrance.D.WorkinFranceandliveinLondon.4Whatasuggestiondoesthetextgive?A.Bothofthepeopleliketomovebetweentwocountries.B.BothofthepeoplearebecomingmoreEuropean.C.TheFrencharebecomingmoreBritish.D.TheBritisharebecomingmoreFrench.
请阅读下面图画和文字并按照要求用英语写一篇150词左右的文章. 【写作内容】 1.上面图文信息中的Mati的情况实际上反映了一种社会现象请以约30词阐述这种现象的主要内容 2.你认为人们该以什么样的态度来对待这种社会现象?是将它当做一种社会问题加以干涉还是当做一种正常现象给予理解?请给出理由论证你的观点至少三点 【写作要求】 1.写作过程中不能直接引用原文语句 2.作文中不能出现真实姓名和学校名称 3.不必写标题 【评分标准】 内容完整语言规范语篇连贯词数适当.
假设你校英语学习报在组织一个关于城市生活问题的讨论.你也想在报上谈谈你的看法.你谈的主要内容如下 1.城市中有许多高楼大厦繁忙的街道舒适的生活环境但也有许多的污染如噪音和烟尘等 2.乡村生活平静安宁但也有如城市中的问题 3.你的看法. 注意1.词数100个左右 2.可适当增加细节以使行文连贯.
下列关于有机物的说法不正确的是
InFlorida.agroupofparentsknownas'thebreakmoms'hasbeenfightingtopassalawguaranteeingthestate'selementary﹣schoolstudentsatleast20minutesofdailyfreeplay.Inasurveyofschool﹣districtadministratorsroughlyathirdsaidtheirdistrictshadreducedoutdoorplayintheearly2000s.Disadvantagedkidshavebeenthemostlikelytobeshortchanged克扣.Accordingtoa2003studyjust56percentofchildrenlivingatorbelowthepovertylinehadbreakcomparedwith83percentofthoseabovethepovertylineasimilardisparity差异existedbetweenblackchildrenandtheirwhitepeers.Thebenefitsofbreakmightseemobvious﹣timetorunaroundhelpskidsstayfit.Butalargebodyofresearchsuggeststhatitalsopromotescognition认知.Manystudieshavefoundthatregularexerciseimprovesmentalfunctionandacademicperformance.Andananalysisofstudiesthatfocusedspecificallyonbreakfoundpositiveassociationsbetweenphysicalactivityandtheabilitytoconcentrateinclass.Inoneseriesofexperiments.researcherscontrolledbreakstarttimes.Somedayschildrenwereletoutat10am.andotherdaysat1030.Thekidsattentivenessdecreasedwhentheyhadtowaitlongerforbreakandrefreshedthemselvesaftertheyplayed.Andwhenfourth﹣gradersinabreak﹣freeschoolweregivenaweeklybreak.Anothergroupofresearchersfoundthattheyhadaneasiertimestayingontaskandweremuchlessrestless.Theseexperimentalfindingsaresupportedbyananalysisof10000questionnairesfilledoutbythird﹣gradeteachersEvenasingle15﹣minutedailybreakwasconnectedwithmore﹣positiveratingsofclassroombehavior.Perhapsmostimportantbreakallowschildrentodesigntheirowngames.totesttheirabilitiestorole﹣playandtosettletheirownconflicts﹣activitiesthatarekeytodevelopingsocialskillsandmanagingcomplicatedsituations.InitialresultsfromanongoingstudyinTexassuggestthatelementary﹣schoolchildrenwhoaregivenfour15﹣minutebreaksadayaresignificantlymoresympathetictowardtheirpeersthanarekidswhodontgetbreak.1Whatcauses'thebreakmoms'tostartafight?A.Pupilslackofoutdoorplay.B.Poorschoolmanagement.C.Absenceofeducationlaws.D.Inequalityamongstudents.2Inoneseriesofexperimentsresearchersfindthat.A.childrenbehavebetterwhenletoutearlierB.kidswaitinglongerareunabletostayfocusedagainC.third﹣gradershavedifficultyinfocusingontaskD.fourth﹣gradersaremoreconcentratedwithoutabreak3Whatcanweinferifwecanensurechildrenacertainamountofdailybreak?A.TheyescapefromlifeconflictsB.TheymaystrengthendependenceC.TheyaremoreconsideratetowardsothersD.Theyareeagertomanagecomplicatedsituations.
下列属于置换反应的是
Actorsshouldbegoodobserverswatchingpeople'sbodylanguageandspeakingstyleandthisintotheirownabilitiestoprogressinacting. A.transferring B.transforming C.transporting D.transmitting
在含有大量Ag+H+NO3﹣的溶液中还可能大量共存的离子是
下列气体既能用排水法又能用向下排空气法收集的是
yourecognizeanidiomwhenitisbeinguseditiseasytomisunderstandwhatyoureadorhearspoken. A.Unless B.After C.Once D.Since
Theworldistoobigtotakeinallatonce.Tomakesenseandbeautyofityouhavetolookatasmallpartatatime.Inusingacamerayouchooseasmallpartthroughheviewfinder.Youmovethecamera'framing'picturesuntilyouseeonethatpleasesyou.Then﹣click!Ifyoumakeagoodchoiceyourpicturewillpleaseothersaswellasyourself.'Whereveryouare'saysphotographerErnstHaas'youaresurroundedbypictures.Thetrickistorecognizethem.'Hisphotographofatwistofbarbedwireshowswhathemeans.Mr.Haastellsusofwaystopracticeseeing.Makeasimpleframeofblackcardboard.Takeitoutofthedoorsandlookthroughitateverydaythingslargeorsmallfarawayornear.Atfirstyoumayseenothingtointerestyou.Butsoonpicturesseemtoleap跳atyouthroughtheframe.Oilfloatingonwatermakesapictureinrainbowcolors.Threepeopleonthestepsofanoldhouseformapicturethatseemstotellsastory.Didyounoticesuchthingsbeforeyouusedtheframe?Perhapsnot.Butwithpracticeyousoondonotneeditshelp.Youseethingsasartistsdo.Everywhereshapesandcolorscatchyoureye.Yourmindtakes'snapshots快照'oftheirpatterns.Thenifyouwishyoucansharewhatyouseebytakingaphotographorbymakingadrawingorapainting.Sometimesit'sfunto'seesmall'.Didyouevernoticethedesignoftheseedsinslicedbananas?Haveyoulookeddeepinsidealily?Orseenthestarburstinthecenterofaweticecube?Doyouseecolorsastheyreallyare?Whenyoupainttreetrunksyouwouldmakethembrownorblack.Buttreetrunksarereallygraypurpleyellow﹣green﹣almostanycolorexceptbrownorblack!Doyounoticedetail?Doingsocanbeinmanyways.Rememberingwhatyouseeisoftenusefultoo.Practicecanhelpyou.Atrickforhelpingyoutorememberdetailisthedoubletake.Look﹣don'tlook﹣thenlookagain.1Whatdoestheunderlinedword'trick'inParagraph3probablymean?A.jokeB.magicC.habitD.skill2Whatdoestheauthorwanttotellus?A.Thebetteryoulearntoseethemorealiveyouare.B.Walkinginthecountryyoushouldlookcloselyatthetrunks.C.Abranchwithafewleavesfillstheframewithabeautifuldesign.D.Closeyoureyesandtrytorememberhowitlooks.3Whichofthefallowingistrueaccordingtothetext?A.Whenyoupainttreesyouwouldmakethemgray.B.Glanceatabillandyourememberhowitlooked.C.Seeingisonewayofliving.D.Giveasecondlookandyourememberallthedetail.4Whatisthemainideaofthetext?A.Theworldistoobigtotravelaround.B.Lookaround﹣andsee!C.Whereveryouareacameraisimportant.D.Agoodwaytoseeistocarryacamera
短周期主族元素XYZW的原子序数依次增大X是原子半径最小的原子Y原子最外层电子数是其内层电子总数的3倍W原子的核电荷数等于XZ原子核电荷数之和X和Z同主族.下列说法正确的是
“绿水青山就是金山银山”良好的生态环境是实现美丽中国的基础 ①下列做法与上述观点符合的是填字母. A.作物秸秆露天焚烧 B.废干电池就地填埋 C.植树造林 D.废旧塑料随意丢放 ②生活垃圾的无害化处理包含堆肥法封闭焚烧和. ③居室装修应使用合格板材以防止挥发的甲醛超标.写出甲醛的结构简式.
Nowlet'sdiscusssomethingaboutpeople'shabits.1Someofthemaregoodonesbutsomeofthemmaybebadones.Canyourememberanyofthebadhabitsyouusedtohavewhenyouwereveryyoung?2Ofcourseyoudonotdothatanymorebutyoucansurelyrememberyourmotherseffortstotrainyou.Thegoodhabitsyounowhaveinsuchmattersaspersonalcleanlinesswerepartofthisearlytraining.Wemaynotsuckourthumbsanymorebutaswegetolderwegetotherbadhabits.3Anyonewhohastriedtogiveupsmokingknowsthisverywell!4Inbabyhoodit'sthumbsuckingInchildhoodit'snail﹣biting.Inourteensit'ssmoking5Andifanyonetellsyouthathehasnobadhabitsyoucanbesurethathemusthavetheworsthabitofall.Isn'tthattrue?A.Wecan'tgivethemupeasilyeither.B.Eachperiodbringsitsownproblems.C.Generallyspeakingaboylikesbitingnails.D.Everyonehashisorherownhabits.E.Webenefitfromourfriendskindhelp.F.Inmiddle﹣ageit'sover﹣eatingandsoon.G.Perhapsasababyyouusedtosuckyourthumb拇指.
有机物X是合成青蒿素原料之一. ①X分子中官能团的名称为醛基和. ②X分子中一定在同一平面上的碳原子有个. ③1molX最多能与molH2发生反应.
有关物质的转化关系如图所示部分物质和条件已略去.X是最常见的无色液体B是红色粉末状的物质CD的组成元素相同且D常用于编织物的漂白. 请回答下列问题 1X的电子式为. 2E的化学式为. 3写出反应①的化学方程式. 4写出反应②的离子方程式.
Ifyouarenotreadingthisonascreenthenyouholdinyourhandsoneofhumanity'sworld﹣changinginventions.Yetthatpowerhasnotbeenmatchedbyfamepaperdelightsinself﹣modestypointingyoutothewordsonitssurfaceandsoactingonlyasastageforideasandargumentsthathavechangedhistory.Withoutthatstagethewrittenandprintedwordwouldhaveattractedonlyasmallaudience.Allthealternativestopapercommonlyusedthroughoutourpre﹣digitalhistoryhavebeentooraretooheavytooexpensiveortooinconvenienttodeliverwordstoawidenumberofpeopleletaloneamassreadershipPaperhasenabledwriterstoreachunprecedented前所未有numbersthroughouthistory.AmongthemweretheBuddhistmissionarytranslatorsfromSouthandCentralAsiawhobroughttheirreligiontoChinaalmosttwothousandyearsago.ThepaperagehasitsoutstandingpersonalitiesLevNikolayevichTolstoyandJohannWolfgangvonGoethewhosecollectedworkswhencombinedfillmorethan200volumes.Formanyofusithasonlybeentheriseofdigitalmediathathasfinallyopenedoureyestopapersstrikingexistenceeverywhere.Ofcoursepaperhasfoundthousandsofrolesforitselfwritingaside.Yourbedsidelampglowsthroughapapercoverandthecupsintheofficecoffeemachinearemadefrompaper.Itcanbeascommonandpracticalasabusticketoritcanbetreasuredandexpensiveasthecarrieroftheworldsbest﹣lovedpainting.Itisclearthatmanypredictionsofpaper'sextinctionhavebeenpremature﹣andgreatlyoverstated.Muchofthe400milliontonsofpaperproducedannuallyisabsolutelynecessarytoourwayoflife.Thebiggerquestionofcourseconcernstheonerolepaperhashadthathasbeentransformativefortheworld.namelyasthecarrierofwrittenorprintedtext.Alreadyitisleavingmuchofthedifficultworkofwordstodigitalmediaandmanyofitscenturies﹣oldroleshavealreadybeenlargelytransferredtothescreen.Thereisalsoasenseinwhichpaperhasitselfbecomeasubjectratherthansimplyamedium.Thisbegantobecomeclearinartseveraldecadesago.aspaperbecamenotsimplythebackdrop背景forartbutinafewcasesthestuffoftheartitself.Thisdoesn'tmeanthatpapersusesasavehicleforwordswillendbutitdoessignalaslowingdown.Morethanthatitsignalsthatpaper'sgreatestvirtuesarenolongergoodenough.Thosevirtuesenabledunprecedentedperiodsofculturalexpansiveness.justastheyencouragedknowledgebeliefsandideastomovefurtherdownthesocio﹣cconomicladder.Yetsuchtransformativequalitiesaresharedbypaper'sdigitalopponent对手andpapercannolongercompeteonspeedofdeliveryscaleofinformationimmediatelyavailableoreaseofaccess.Paper'shistoricdynamism活力hasreceiveditsfirstgreatchallengeandinmanyaspectsitappearstobelosingNostalgia怀旧simplydismissespapertoamuseumpiece.Buttherearereasonstothinkthatthedynamismthatpaperhasexhibitedoversome20centurieswillnotbetransferredtotallytodigitalmedia.Thereareafewpracticalreasons.Electricpowerisalwaysneededfordigitalmediaofcourse.Moreimportantlyanythingonlinecanpotentiallybehackedinto.Yourownreadingchoicescanbeviewedfromtheothersideoftheworld.Evenwhatyouwritecanbeviewedandchangedordeleted.Butitistheownershipofknowledgethatmattersmost.AsAmazonrecentlyremindedakindlereaderwhohadlostthetextofabookhewasreading.youdonot'own'yourbooksonKindleasyouownaphysicalbook.Yousimplyhavetherighttoaccessthem.Thedigitalrevolutioncertainlyprovidesunprecedentedaccesstoknowledge.Butitisaccessonly.Textthatyoucanholdshelveandownduetopaperwillalwayshaveamagicallitsown.1Whydoespapernothavewell﹣deservedfame?A.Muchinformationisavailableonascreen.B.Ittakesgreatdelightinbeingmodest.C.Onlyasmallcrowdenjoysthebenefitsofit.D.Italwaysguidesreaderstofocusmoreonitself.2TheunderlinedpartinParagraph4impliesthatthedigitalmedia.A.ignorestheexistenceofpaperB.promotesthewideuseofpaperC.replacesthefunctionsofpaperD.helpsusrealizetherolesofpaper3Onereasonwhypaperwon'tcometoanendisthat.A.itisbeingmass﹣producedB.itismorethanamediumC.ithasacenturies﹣oldroleD.itisawell﹣knowninvention4What'sthepurposeofmentioningthebestvirtuesofpaperinParagraph6?A.Toshowitsfastdevelopment.B.Toproveitsunchangedstrength.C.Toindicateitslossofcompetitiveness.D.Tobringbackitspastbrilliance.5Whatisthebiggestproblemthedigitalmediaface?A.Itdependsonelectricpower.B.Personalprivacyiseasytoleak.C.Usersonlyhavetherighttouse.D.Thejoyofreadingishardtofeel.6Whatisthebesttitleforthepassage?A.TheHistoryofPaperB.ThePowerofPaperC.TheDevelopmentofPaperD.TheApplicationofPaper
材料是人类社会发展的物质基础 港珠澳大桥是世界最长的跨海大桥建造过程中使用了多种新型材料. ①撑起这座海上“钢铁巨龙“的“不锈基座“所用的是双相不锈钢钢筋这是利用了双相不锈钢钢筋的强度高填字母下同的性质. A.导热性B.导电性C.耐腐蚀性 ②建造大桥需用重达6000吨的钢筋混凝土预制件海上吊装钢筋混凝土预制件的吊带是超高分子量聚乙烯纤维组成.这种超高分子量聚乙烯纤维属于. A.金属材料B.无机非金属材料C.复合材料 ③建造大桥的过程中还使用了大量的钢结构这些钢结构露置在潮湿的环境中易发生电化学腐蚀写出发生电化学腐蚀时负极的电极反应式.
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