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如图，足球图片正中的黑色正五边形的内角和是（ ）
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如图足球图片正中的黑色正五边形的内角和是
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正五边形的内角和为_________每个内角为_________
如图足球图片正中的黑色正五边形的内角和是
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C60分子的结构就像足球的外皮它是由个正五边形和个正六边形组成的中空碳球
正十二边形的内角和是.正五边形的外角和是.
如图足球图片正中的黑色正五边形的内角和是
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足球比赛用球是由红白两色皮子缝制的其中红色皮子为正五边形白色皮子为正六边形并且红色正五边形与白色正六
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我们知道形状为正五边形的地砖不能铺满地面但某公园的一段路面是用型号相同的特殊的五边形地砖铺成的.如图
如图足球图片正中的黑色正五边形的内角和是
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540°
720°
如图足球图片正中的黑色正五边形的内角和是
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如图足球图片正中的黑色正五边形的内角和是
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如图足球图片正中的黑色正五边形的内角和是
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正五边形的每个内角等于
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108°
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如图足球图片正中的黑色正五边形的内角和是
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720°
如图足球图片正中的黑色正五边形的内角和是
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如图足球图片正中的黑色正五边形的内角和是
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圆的内接五边形其内角都相等求证这个五边形为正五边形.
正五边形的内角和等于______度.
正五边形的每一个内角都等于
正五边形每个内角度数是°.
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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．
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.
假定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写的以下作文.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. Itwasraininghardlyoutsidewhichmadeitdifficultformetogohomeforlunch.JustasIwaswonderingwhatIshouldeatatnoonIsawafamiliarfigurepassedbyourclassroom.Irushedoutanditwasmymotheralreadyinfiftieswhichbroughtmelunchinspiteoftheheavyrain.InChinamanyparentsmakegreatsacrificesforourchildren.Butwhathadthechildrendoneinreturn?Alltoooftenmostchildrenjusttakeitforgrantedthattheirparentshouldserveforthemunconditionally.Mydearmumordadthankyouverymuchforbringingmeup.HowshallIdoforyou?
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
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下列物质的制备能够成功的是
化学与生活社会发展息息相关下列说法不正确的是
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．
“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．
在含有大量Ag+H+NO3﹣的溶液中还可能大量共存的离子是
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
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Actorsshouldbegoodobserverswatchingpeople'sbodylanguageandspeakingstyleandthisintotheirownabilitiestoprogressinacting. A.transferring B.transforming C.transporting D.transmitting
Itwasmyfirstnightinmycollegedormroom.AcoupleofmonthsagoIwaspreparedforfinals1andthedayIwouldkeepmypromise﹣2outassoonasIhadthechance.I3usedthreatwhenIwasangryorcouldn'tgetmyway.4myparentsjustgrinned.NowI5watchingTVprogramswithmyparents.Imissedthetimemyparentsspentwithme.ImissedthehomevideosI6withmybrotherandsister.Nowthosemomentsareonlymemories.SittingatmydeskwithmylaptopopenI7ane﹣mailtoaradiostationmymomlistenstoeverymorningbeforework.I8aspecialsongcalledDon'tForgettoRemember.Thenextmorningmymomgotoutofbedand9theradioasusual.Shewasamazedbythespeakers'10'Youknowhow11IwasweeksagobecauseIsentmylittlegirltoschoolforthefirsttime?Acollegestudent12usandsaidthatshemissesherparentsand13theyhavedoneforher.Shealsochoseaspecialsongin14ofthem.SowewanttothankCindyforthate﹣mail15itreallyeasedmyworryaboutmylittlegirlgrowingupand16aboutthingsparentsdoforthem'.Thesongbegantoplaywhilemymomranovertomydadand17himup.'Honey!Didyouhearthat?WasthatourCindy?Ourdaughterwhocouldn'twaitto18home?'Mydadjustbarelyopeninghiseyesrepliedwith'Ifitisthatisvery19ofher.'Igotacallfrommymomthatnight.IwassoexcitedtotellherthatI20myfirstdayofcollegeandwetalkedforaboutanhour.JustwhenwewereabouttosayourgoodbyesIaddedonelastplea'Momdon'tforgettorememberme.'1A.revision B.decision C.vacation D.graduation2A.work B.make C.move D.burst3A.even B.yet C.ever D.still4A.And B.So C.But D.Or5A.tried B.missed C.avoided D.imagine6A.sold B.found C.saved D.made7A.downloaded B.addressed C.deleted D.received8A.requested B.sang C.wrote D.produced9A.turnedup B.turnedon C.turneddown D.turnedoff10A.notice B.announcement C.conversation D.argument11A.upset B.excited C.annoy D.cold12A.telephoned B.e﹣mailed C.messaged D.informed13A.something B.anything C.everything D.nothing14A.favor B.defence C.celebration D.honor15A.though B.because C.unless D.until16A.quarreling B.complaining C.bothering D.forgetting17A.woke B.lifted C.raised D.picked18A.return B.get C.leave D.arrive19A.selfless B.honest C.patient D.sweet20A.survived B.hated C.wasted D.expected
Intoday'sworldmanypeopleseemtobe1hungerformoney.Moneydoeshaveitsmostusefuleffectsonthepoor.2evenifapersonhasalreadygotplentyofmoney3happycan'tbeboughtbymoney.Ifmoneywerebeginningallmillionaires4havereallovetruefriendshipgoodhealthandalonglife.Howeverthisisnotalwayscorrect.Since5beginningoftimenothreewordshaveeverinvitedmore6pleasedthan'Iloveyou'.Butcanlovebebought?I'mafraidnotLove7meantogivenottotake.Toeverypersonhealthandalonglifeareboughtwithmoney?Theansweris'No'.Ofallthelongest8lifepeopleintheworldfewofthemaremillionaires.Truefriendshipcan'tbeboughteitherinaworldwheremoneyis9dreamtoomuchitcancausebrotherstoquarrelmarriagetoendloverstohateand10strangetofight.Nomatterhowmuchmoneyyouhaveitisstillnotenoughtomakeahappypersonifyouhavenoonetolaughwithnoonetocryfor.
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.
下列关于有机物的说法不正确的是
紫水晶在西方国家代表着“爱的守护石”其主要成分SiO2属于
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
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
下列过程吸收热量的是
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.
下列有关物质用途的说法正确的是
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
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