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用化学用语回答下列问题：硫酸钠的化学式 ．
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甲工厂排j出的废水中含有少量氢氧化钠和硫酸钠与乙工厂排出的废水混合后测得溶液的pH=7且只含有氯化钠
某固体粉末可能含有碳酸钙硫酸钠氯化钠氯化钡硫酸铜中的一种或几种为确定该固体粉末的成分进行了如下实验第
用化学用语回答下列问题．碳酸钠的化学式是．
用化学式或化学符号填空1硫酸钠2氧化铁中铁元素的化合价.
1写出下列物质的化学式①甲烷_________②硫酸铁_________.2写出下列反应的化学方程式
用化学用语表示12个氧分子2人体中含量最高的金属元素3写出硫酸钠的化学式并标出其中硫元素的化合价42
某固体粉末可能含有碳酸钙硫酸钠氧化钡硫酸铜中的一种或几种为确定该固体粉末的成分进行如下实验回答下列问
2012年4月16日修正药业等多家药企被曝采用工业明胶加工成药用胶囊溶胶调色的过程中加入一种名叫十二
十二烷基硫酸钠属于有机化合物
十二烷基硫酸钠由碳、氢、硫、氧、钠五种元素组成
十二烷基硫酸钠中碳元素与氧元素质量比为3:1
十二烷基硫酸钠分子中含有43个原子
最近网上有文章报道一些厂家为了使生产出来的米线更白净更筋道在米线中添加一些名为焦亚硫酸钠化学式Na2
某固体粉末可能含有碳酸钙硫酸钠氯化钡硫酸铜中的一种或几种为确定该固体粉末的成分进行如下实验53题图回
用化学用语回答下列问题.1人体缺乏后会引起贫血的元素2碳酸根离子3医用酒精中溶质的化学式.
回答下列问题1用化学用语填空①氧元素②硫酸钠中的阳离子③氯化铝④2个五氧化二磷分子2①Fe2+中2表
用化学用语表示12个氧分子2人体中含量最高的金属元素3写出硫酸钠的化学式并标出其中硫元素的化合价42
用化学用语填空12个氮分子______2硫酸根离子____3+2价的铁元素_______4碳酸钠__
最近网上有文章报道一些厂家为了使生产出来的米线更白净更劲道在米线中添加一些名为焦亚硫酸钠化学式Na2
用化学用语回答12个氯离子2氢氧化钙中钙显＋2价32个亚铁离子4氨气5硫酸钠的化学式________
用化学用语回答下列问题硫酸钠．
下列化学用语正确的是
硝酸铁的化学式为 Fe(NO)
3
硫酸钠的化学式是NaSO
4
乙醇的化学式为C
2
H
6
O
氖气的化学式为N
2
焦亚硫酸钠有毒不能直接用于食品加工市场上有不法商贩用其溶液浸泡生姜使生姜发黄发亮食用此种生姜可能使人
1用化学用语表示下列物质或粒子氧化铝碳酸钠2个硫酸根离子2下图是白磷和石墨的结构示意图白磷的化学式是
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重庆地区水资源总量较丰富下列有关水的说法错误的是
下列有关细胞结构和成分的叙述错误的是
如图是城市污水处理的流程图 阅读流程图回答下列问题 1在污水处理流程中一级处理过程中使用的处理方法发生的是变化填“物理”或“化学”该过程中的处理方法主要是除去物质 2在消毒清水池中常用二氧化氯这种物质对水进行消毒二氧化氯的化学式是其中氯元素的化合价是价 3硬水在日常生活工业生产中常带来不便长期饮用硬水会增加人体过滤系统结石的得病率．生活中常用的方法将硬水进行软化而区别硬水和软水常使用． 4该污水处理流程中活性炭的作用是． 5高铁酸钠Na2FeO4是水处理过程中使用的一种新型净水剂制取高铁酸钠的化学方程式如下 2FeNO33+16NaOH+3Cl2＝6NaNO3+2Na2FeO4+6x+8H2O则X的化学式是． 6节约用水是每个公民的义务下列用水方式应该提倡的有填字母序号 A．洗澡擦沐浴露时暂时关闭水龙头 B．不间断地边流水边洗衣 C．用淘米水和洗菜水浇花或冲厕所 D．用喷灌滴灌的方法浇灌农田和园林
小红对暗紫色粉末A进行实验实验过程如图所示．请回答下列问题 1写出下列物质的化学符号AEFG． 2写出A受热分解的化学符号表达式 3黑色固体G在无色气体B中得到H的化学符号表达式检验气体H的方法是．
DirectionsCompletethefollowingpassagebyusingthewordsinthebox.Eachwordcanonlybeusedonce.Notethatthereisonewordmorethanyouneed. Consideringhowmuchtimepeoplespendinofficesitisimportantthatworkbewelldesigned.Well﹣designedofficespaceshelpcreateacooperation'simage.Theymotivateworkersandtheymakeanimpressiononpeoplewhovisitandmightbepotentialor41customer.Theymakebusinessesworkbetterandtheyareapartofthecorporateculturewelivein. Aswemoveawayfromanindustrial﹣basedeconomytoaknowledge﹣basedoneofficedesignershavecomeupwith42tothetraditionalworkenvironmentsofthepast.Thedesignindustryhasmovedawayfromafixedofficesetupandcreatedmoreflexiblestrategicmanagementenvironments.These43solutionsaretomeanttosupportbetterorganizationalperformances. Asemployeehierarchies等级制度haveflattenedordecreasedofficedesigners‘responsetothischangehasbeentomoveopen﹣plainareastomoredesirablelocationswithintheofficeandcreatefewerformalprivateoffices.Theneedforincreasedflexibilityhasalsobeen44bychangesinworkstationdesign.Officesandworkspacesoftenarenot45toagivenpersononapermanentbasisbecauseofchangestomethodofworkingnewdesignsallowforexpansionormovementofdesksstorageandequipmentwithintheworkstation.Anotherimportantdesigngoaliscommunicationwhichdesignershaveimprovedbyloweringthewallsthat46workstations.Designershavealsocreatedinformalgatheringplacesandupgradedemployees'47toheavilytraffickedareassuchascopyandcoffeerooms. Corporateandinstitutionalofficedesignersoftenstruggletoresolveanumberofcompetingandoften48demandsincludingbudgetarylimitsemployeehierarchiesandtechnologicalinnovationespeciallyinrelationtocomputerization.Thesedemandsmustalsobebalancedwiththeneedtocreateinteriors内饰thatinsomewayenhanceestablishorpromoteacompany‘simageandwillenableemployeesto49attheirbest.Allthese50ofofficedesignarerelated.Themostsuccessfulofficedesignsarelikeagoodmarriage﹣﹣thewell﹣designedofficeandtheemployeesthatoccupyitareseeminglymadeforeachother. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50.
Giftfromastranger Mylocalsupermarketisalwaysbusy.ThefirstparkingspaceIfoundwasconvenientbutI'dnoticedawomaninabluecarcirclingforawhile.25IwasinagoodmoodIletherhaveit.OntheedgeofthecarparkIbackedintothenextavailablespot﹣itwasatightfit. PrettysoonI'dmademywaythroughthesupermarketandwasbackinthefreshair.FeelinggoodI26emptymypursechangeintothehandsofahomelessmanandhelpedastrugglingwomanreversepark. JustasIapproachedmycar1sawthewomanI'dlethavemycarspaceearlier.Shewasgivingme27oddlook﹣halfpuzzledhalfintent热切的.Ismiledandwishedherapleasantday.AsIsqueezedbackintomycarIspottedthesamelady28lookinatme.Helloshesaidhesitantly.This29soundcrazybutIwasonmywaytodropsomeofmymother'sthingsoffatthecharitybins.Youarejustsomuch30her.YouhelpedthosepeopleInoticedandyouseemedsohappy.Shelookedatmemeaningfullyandpassedaboxinthroughthewindow.Ithinkshewouldlikeyoutohaveit.31shockItookitfromherautomatically.Shesmiledandwalkedaway. AfterapauseIopenedthebox.Insidewasabeautifulgoldnecklacewithalargegreypearl.Itwas32nicegiftI'deverreceivedanditwasfromacompletestranger.Thenecklacewasaroundmyneckawarmreminderofhumankindness. 25. 26. 27. 28. 29. 30. 31. 32.
56.AccordingtotheCodevisitorsshouldact. A.withcareandrespect B.withreliefandpleasure C.withcautionandcalmness D.withattentionandobservation 57.WhatareyouencouragedtodowhentravellinginNewZealand? A.Takeyourowncampingfacilities. B.Buryglassfarawayfromrivers. C.Followthetrackforthesakeofplants. D.Observesignstoapproachnestingbirds.
下列有关过滤和蒸馏的说法不正确的是
OneoftheexecutivesgatheredattheAspenInstituteforaday﹣longleadershipworkshopusingtheworksofShakespearewasdiscussingtheroleofBrutusinthedeathofJuliusCaesar.Brutuswasnotanhonorablemanhesaid.Hewasatraitor叛徒.Andhemurderedsomeoneincoldblood.TheagreementwasthatBrutushadactedwithcrueltywhenotheroptionswereavailabletohim.Hemadeabaddecisiontheysaid﹣atleastasitwaspresentedbyShakespeare﹣totaketheleadinmurderingJuliusCaesar.AndthoughoneoftheexecutivesacknowledgedthatBrutushadthegoodoftherepublicinmindCaesarwasneverthelesshissuperior.Youhavetoendeavortheexecutivessaidourpolicyistoobeythechainofcommand. DuringthelastfewyearsbusinessexecutivesandbookwriterslookingforanewwaytoadvisecorporateAmericahavebeenexploitingShakespeare'swisdomforprofitableends.NonemoresothanhusbandandwifeteamKennethandCarolAdelmanwell﹣knownadviserstotheWhiteHousewhostartedupatrainingcompanycalledMoversandShakespeares.TheyareamateurShakespearescholarsandShakespeareloversandtheyhavecombinedtheirpassionandtheirhighlevelcontactsintoamanagementtrainingbusiness.Theyconductbetween30and40workshopsannuallyfocusingonhalfadozendifferentplaysmostlyforcorporationsbutalsoforgovernmentagencies. Theworkshopsalltakethesameformfocusingonasingleplayasakindofcasestudyandusingindividualscenesasspecificlessons.InJuliusCaesarslyprovocation狡诈的挑唆ofBrutustotakeuparmsagainstthewhatwasabasisforadiscussionofmethodsofteambuildingandgrassrootsorganism. AlthoughneitheroftheAdelmansisacademicallytrainedinliteraturetheprogrammescontainplentyofShakespearetraditionandbackground.TheirworkshoponHenryVforexampleincludesahelpfulexplanationofHenry'swinningstrategyattheBattleofAgincourt.Buttheydocometothetextwithafewbiases偏向theirreadingofHenryVminimizeshismisuseofpower.Insteadtheyemphasizethestoryoftheyouthwhoseizesopportunityandbecomesamasterfulleader.AndattheworkshoponCaesarMr.AdelmanshadlittlegoodtosayaboutBrutussayingthenoblestRomanofthemallcouldn'tmakehismindupaboutthings. ManyoftheparticipantspointedtoveryspecificelementsintheplaythattheyfeltrelatedCaesar'spridewhichledtohismurderandBrutus'smistakesinleadingtheafterthemurdertheysaidraisevitalquestionsforanyoneservingasabusinesswhenandhowdoyouresisttheboss? 73.Accordingtoparagraph1whatdidalltheexecutivesthinkofBrutus?. A.Cruel. B.Superior. C.Honourable. D.Rude 74.AccordingtothepassagetheAdelmanssetupMoversandShakespearesto. A.helpexecutivestounderstandShakespeare'splaysbetter B.giveadviceonleadershipbyanalyzingShakespeare'splays C.providecasestudiesofShakespeare'splaysinliteratureworkshops D.guidegovernmentagenciestofollowthecharactersinShakespeare'splays. 75.WhydotheAdelmansconductaworkshoponHenryV? A.Tohighlighttheimportanceofcatchingopportunities. B.Toencouragemasterfulleaderstoplanstrategiestowin. C.Toillustratetheharmofprejudicesinmanagement. D.Towarnexecutivesagainstpowermisuse. 76.Itcanbeinferredfromthepassagethat. A.theAdelmans'programmeprovesbiasedastherolesofcharactersaremaximized. B.executivesfeelboredwithtoomanyspecificelementsofShakespeare'splays. C.theAdelmanswillmakemoreprofitsiftheyareprofessionalscholars. D.Shakespearehasplayedanimportantroleinthemanagementfield. 77.Thebesttitleforthepassageis. A.Shakespeare'splaysExecutivesreconsidercorporateculture B.Shakespeare'splaysAnessentialkeytobusinesssuccess C.Shakespeare'splaysalessonforbusinessmotivation D.Shakespeare'splaysDramatictrainingbringsdramaticresults.
研究人员分别测试生长素类似物甲和乙对莴苣幼根生长的影响部分结果如表．下列分析正确的是
﹣GoandsaysorrytoyourMomDave. ﹣I'dliketobutI'mafraidshewon'tbehappywithmy. A.requests B.excuses C.apologies D.regrets
近日中国在四川某地发现了一个超大规模的锂矿储量高达52万吨被称之为“中国锂谷”．锂矿是重要的国家战略资源有着21世纪改变世界格局的“白色石油”和“绿色能源金属”之称．如图是锂原子结构示意图和锂元素在元素周期表中的相关信息．下列说法不正确的是
下列叙述完全符合质量守恒定律的是
下列物质由分子构成的是
某科学兴趣小组的同学设计了如下四个实验装置天平略来验证质量守恒定律． 1上述的四个实验装置中装置能直接用于验证质量守恒定律 2①装置A中发生反应的化学符号表达式实验过程中气球的变化是． ②点燃红磷的实验过程中固体质量变化如图1所示参加反应的氧气质量为g． 3CD反应的微观示意图如图2所示实际生成的物质分子数目之比为．
下列古代生产工艺或文明中主要利用化学变化的是
某群落最初主要有针茅早熟禾等多年生草本植物．放牧和烧荒后逐渐演替为以草本和灌木为优势种的群落．其中灌木分泌的樟脑聚集在土壤中会抑制周围1m﹣2m内草本植物生长而形成裸地．下列分析正确的是
Supposeyoubecomealeaderinanorganization.It'sverylikelythatyou'llwanttohavevolunteerstohelpwiththeorganization'sactivities.Todosoitshouldhelptounderstandwhypeopleundertakevolunteerworkandwhatkeepstheirinterestinthework. Let'sbeginwiththequestionofwhypeoplevolunteer.Researchershaveidentifiedseveralfactorsthatmotivatepeopletogetinvolved.Forexamplepeoplevolunteertoexpresspersonalvaluesrelatedtounselfishnesstoexpandtheirrangeofexperiencesandtostrengthensocialrelationships.Ifvolunteerpositionsdonotmeettheseneedspeoplemaynotwishtoparticipate.Toselectvolunteersyoumayneedtounderstandthemotivationsofthepeopleyouwishtoattract. Peoplealsovolunteerbecausetheyarerequiredtodoso.Toincreaselevelsofcommunityservicesomeschoolshavelaunchedcompulsoryvolunteerprograms.Unfortunatelytheseprogramscanshiftpeople'swishofparticipationfromaninternalfactore.g.Ivolunteerbecauseit'simportanttometoanexternalfactore.g.IvolunteerbecauseI'mrequiredtodoso.Whenthathappenspeoplebecomelesslikelytovolunteerinthefuture.Peoplemustbesensitivetothispossibilitywhentheymakevolunteeractivitiesamust. Oncepeoplebegintovolunteerwhatleadsthemtoremainintheirpositionsovertime?Toanswerthisquestionresearchershaveconductedfollow﹣upstudiesinwhichtheytrackvolunteersovertime.Forinstanceonestudyfollowed238volunteersinFloridaoverayear.Oneofthemostimportantfactorsthatinfluencedtheirsatisfactionasvolunteerswastheamountofsufferingtheyexperiencedintheirvolunteerpositions.Althoughthisresultmaynotsurpriseyouitleadstoimportantpracticaladvice.Theresearchersnotethatattentionshouldbegiventotrainingmethodsthatwouldpreparevolunteersfortroublesomesituationsorprovidethemwithstrategiesforcopingwiththeproblemtheydoexperience. Anotherstudyof302volunteersathospitalsinChicagofocusedonindividualdifferencesinthedegreetowhichpeopleviewvolunteerasanimportantsocialrole.Itwasassumedthatthosepeopleforwhomtheroleofvolunteerwasmostpartoftheirpersonalidentitywouldalsobemostlikelytocontinuevolunteerwork.ParticipantsindicatedthedegreetowhichthesocialrolematteredbyrespondingtostatementssuchasVolunteeringinHospitalisanimportantpartofwhoIam.Consistentwiththeresearchers'expectationstheyfoundapositivecorrelation正相关betweenthestrengthofroleidentityandthelengthoftimepeoplecontinuedtovolunteer.TheseresultsonceagainleadtoconcreteadviceOnceanindividualbeginsvolunteeringcontinuedeffortsmightfocusondevelopingavolunteerroleidentity…ItemslikeT﹣shirtsthatallowvolunteerstoberecognizedpubliclyfortheircontributionscanhelpstrengthenroleidentity. 61.Peoplevolunteermainlyoutof. A.academicrequirements B.socialexpectations C.financialrewards D.internalneeds 62.WhatcanwelearnfromtheFloridastudy? A.Follow﹣upstudiesshouldlastforoneyear. B.Volunteersshouldgetmentallyprepared. C.Strategytrainingisamustinresearch. D.Volunteersareprovidedwithconcreteadvice. 63.Whatismostlikelytomotivatevolunteerstocontinuetheirwork? A.Individualdifferencesinroleidentity. B.PubliclyidentifiablevolunteerT﹣shirts. C.Roleidentityasavolunteer. D.Practicaladvicefromresearchers. 64.Whatisthebesttitleofthepassage? A.HowtoGetPeopletoVolunteer B.HowtoStudyVolunteerBehaviors C.HowtoKeepVolunteers'Interest D.HowtoOrganizeVolunteerActivities.
Looktomanyofhistory'sculturalsymbolsandthereyou'llfindanancestorofFrostythesnowmaninthemovieFrozen.Itappearedonsomeofthefirstpostcardsstarredinsomeoftheearliestsilentmoviesandwasthesubjectofacoupleoftheearliestphotosdatingallthewaybacktothe1800s.Idiscoveredevenmoreaboutoneofhumanity'searliestformsoflifeartduringseveralyearsofresearcharoundtheworld. ForexamplesnowmenwereaphenomenonintheMiddleAgesbuiltwithgreatskillandthought.Atatimeoflimitedmeansofexpressionsnowwaslikefreeartsuppliesdroppedfromthesky.Itwasapopularactivityforcouplestoleisurelywalkthroughtowntoviewthetemporaryworksofchillyart.Somewerecreatedbyfamousartistsincludinga19﹣year﹣oldMichelangelowhoin1494wasappointedbytherulerofFlorenceItalytobuildasnowmaninhismansion'scourtyard. TheMiracleof1511tookplaceduringsixfreezingworkscalledtheWinterofDeath.ThecityofBrusselswascoveredinsnowmen﹣animpressivescenethattoldstoriesoneverystreetcorner.Somewerepoliticalinnaturecriticizingthechurchandgovernment.Somewereareflectionofpeople'simagination.ForthepeopleofBrusselsthiswasadefiningmomentofdefiningfreedom.Atleastuntilspringarrivedbywhichtimetheyweredealingwithdamagingfloods. Ifyoufeartheheydayofthesnowmanhaspasseddon'tworryI'velearnedthatsomeexplosivesnowmanhistoryisstillbeingmadetoday.Everyyearsince1818thepeopleofZurichSwitzerlandcelebratethebeginningofspringbyblowingupasnowman.OnthethirdMondayofApriltheholidaySechselauteniskickedoffwhenacottonsnowmancalledtheBooggisstuffedwithexplosiveandparadedthroughtownbybakersandothertradesmenwhothrowbreadtothecrowds.TheparadeendswiththeBooggbeingplacedona40﹣footpileoffirewood.AfterthebellsoftheChurchofSt.Peterhaverungsixtimesrepresentingthepassingofwinterthepileislit.Whenthesnowmanexplodeswinterisconsideredofficiallyover﹣thequickeritisburntdownthelongersummerissaidtobe. 66.AccordingtothepassagewhydidsnowmenbecomeaphenomenonintheMiddleAges? . A.Peoplethoughtofsnowasholyartsupplies. B.Peoplelongedtoseemasterpiecesofsnow. C.Buildingsnowmenwasawayforpeopletoexpressthemselves. D.Buildingsnowmenhelpedpeopledeveloptheirskillandthought. 67.Theheydayofthesnowmanparagraph4meansthetimewhen. A.snowmenweremademainlybyartists B.snowmenenjoyedgreatpopularity C.snowmenwerepoliticallycriticized D.snowmencauseddamagingfloods 68.InZurichtheblowingupoftheBooggsymbolizes. A.thestartoftheparade B.thecomingofalongersummer C.thepassingofthewinter D.thesuccessoftradesmen 69.Whatcanbeconcludedaboutsnowmenfromthepassage? A.Theywereappreciatedinhistory B.Theyhavelosttheirvalue C.Theywererelatedtomovies D.Theyvaryinshapeandsize.
如图是用红磷燃烧法测定空气里氧气含量的装置图有关此实验的结论与分析正确的是
科研人员为探究植物A生长的最佳光照强度设计了下面的实验．首先取若干生长状况相同的植物A的植株平均分为5组分别放在密闭的玻璃容器中．实验开始时测定CO2的浓度12小时后再次测定CO2的浓度．实验结果如下表．请分析回答下列问题 1第1组实验在12小时后CO2浓度变化的原因是由于． 2本实验中无关变量有答出两点即可． 3从根据表中实验数据能/不能确定80%普通阳光是植物A生长的最佳光照强度理由是．
﹣Whydidn'tyouinviteJohntoyourbirthdayparty? ﹣Wellyouknowhe's. A.anearlybird B.awetblanket C.aluckydog D.atoughnut
下列物质中属于纯净物的是
Peopleselectnewsinexpectationofareward.Thisrewardmaybeeitheroftwokinds.OneisrelatedtowhatFreudcallsthePleasurePrincipletheothertowhathecallstheRealityPrinciple.Forwantofbetternamesweshallcallthesetwoclassesimmediaterewardanddelayedreward.Ingeneralthekindofnewswhichmaybeexpectedtogiveimmediaterewardarenewsofcrimeandcorruptionaccidentsanddisasterssportssocialeventsandhumaninterest.Delayedrewardmaybeexpectedfromnewsofpublicaffairseconomicmatterssocialproblemsscienceeducationandhealth. Newsofthefirstkindpaysitsrewardsatonce.Areadercanenjoyanindirectexperiencewithoutanyofthedangersorstressesinvolved.Hecantremblewildlyatanaxe﹣murdershakehisheadsympatheticallyandsafelyatahurricaneidentifyhimselfwiththewinningteamlaughunderstandinglyatawarmlittlestoryofchildrenordogs.Newsofthesecondkindhoweverpaysitsrewardslater.Itsometimesrequiresthereadertotolerateunpleasantnessorannoyance﹣asforexamplewhenhereadsofthethreateningforeignsituationthemountingnationaldebtrisingtaxesfallingmarketscarcehousingandcancer.Ithasakindofthreatvalue.Itisreadsothatthereadermaybeinformedandprepared.Whenareaderselectsdelayedrewardnewshepullshimselfintotheworldofsurroundingrealitytowhichhecanadapthimselfonlybyhardwork.Whenheselectsnewsoftheotherkindheusuallywithdrawsfromtheworldofthreateningrealitytowardthedreamworld. Foranyindividualofcoursetheboundariesofthesetwoclassesarenotstable.Forexampleasociologistmayreadnewsofcrimeasasocialproblemratherthanforitsimmediatereward.Acoachmayreadasportsstoryforitsthreatvaluehemayhavetoplaythatteamnextweek.Apoliticianmayreadanaccountofhislatestsuccessfulpublicmeetingnotforitsdelayedrewardbutverymuchashiswifereadsanaccountofaparty.Inanygivenstoryofcorruptionordisasterathoughtfulreadermayreceivenotonlytheimmediaterewardofindirectexperiencebutalsothedelayedrewardofinformationandpreparedness.Thereforewhilethedivisionofcategoriesholdsingeneralanindividual'stendencymaytransferanystoryfromonekindofreadingtoanotherordividetheexperiencebetweenthetwokindsofreward. 71. 72. 73. 74. 75. 76. 77. 78. 79. 80.
下列化学用语正确的是
美食是人们造访上海的乐趣之一.visit.
按要求填空 1用化学符号填空 2个硫酸根氖气地壳中含量最多的金属元素氧化铁中铁元素化合价． 2写出下列微粒符号中“2”的含义 2O3表示NO2表示Zn2+表示O． 3下列物质①臭氧②蒸馏水③纯净的空气④铜片⑤高锰酸钾⑥硫在氧气中燃烧的生成物⑦澄清石灰水⑧河水⑨碳酸钠 属于混合物的有填序号下同属于单质的有属于氧化物的有．
“尾气催化转换器”将汽车尾气中的有毒气体转变为无毒气体．其微观过程如图所示其中不同的圆球代表不同的原子．下列说法中正确的是
申请材料需要精心准备这样你心仪的学校才会对你的能力有全面准确的了解.inorderthat.
在你生命中如果有一个人你需要对他说对不起那么就去向他道歉吧.apologyIfthereissomeoneinyourlifetowhomyouneedtosaysorrygoaheadandmakean apology..
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