首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
在物理学和天文学中，常用光年作为衡量两个星球之间的距离．1光年是指光在真空中穿行1年的距离．如果光在真空中的速度约是3×105km/s，1年以3.2×107s来计算的话，那么1光年等于多少km？
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
天文学上常用的距离单位是什么
公里
千米
光年
米
现代物理学的两大理论支柱是
原子论和分子论
热力学和天文学
天文学和粒子物理学
相对论和量子论
哥白尼革命包括三个层面的革命分别是天文学革命物理学革命地球宇宙学革命
天文学中常用天文单位AU做距离单位.1AU是指地球到太阳/月球之间的平均距离.神舟五号载人飞船在太空
光年是天文学中常用的距离单位光在真空中一年所走的距离叫光年
意大利科学家伽利略的贡献主要在于哪些领域
物理学、化学
物理学、天文学
天文学、生物学
物理学、生物学
现代物理的两大理论支柱是
原子论和相对论
生物学和天文学
天文学和粒子物理学
相对论和量子力学
反应时始于哪个学科的研究
天文学
哲学
生理学
物理学
数学革命的主角不包括
天文学
物理学
化学
光学
对哲学与科学方法产生深远的影响
物理学
天文学
几何学
下列不属于托勒密主要贡献的是
天文学
物理学
地理学
数学
下列学科中不属于数理传统的是
天文学
数学
化学
物理学
天文学中确定星体间距离的常用单位是
米
公里
年
光年
天文学上常用光年光在一年内传播的距离作长度单位已知织女星距地球约2.7光年求织女星距地球多少千米
提丢斯波德公式是上的成就
天文学
地理学
物理学
数学
天文学上常用天文单位来表示距离一个天文单位指的是
地球到月球的平均距离
地球到太阳的平均距离
本星到太阳的平均距离
一光年
天文学上常用光年光在一年内传播的距离作长度单位已知织女星距地球约27光年求织女星距地球多少千米
托勒密的主要贡献有
天文学、地理学、数学
天文学、物理学、数学
地理学、哲学、数学
数学、哲学、物理学
天文学与物理学的相互促进反映在那些方面
根据的讲话在牛顿时代领头的学科是天文学物理学是随着天文学的发展而发展的
热门试题
更多
Ifyoufeelstressedbyresponsibilitiesatworkyoushouldtakeastepbackandidentify识别thoseof61greatandlessimportance.Thenhandlethemostimportanttasksfirstsoyou'llfeelarealsenseof62achieve.Leavingthelessimportantthingsuntiltomorrow63beoftenacceptable. Mostofusaremorefocused64ourtasksinthemorningthanwearelaterintheday.Sogetanearlystartandtrytobeasproductive65possiblebeforelunch.Thiswillgiveyoutheconfidenceyouneedtogetyouthroughtheafternoonandgohomefeelingaccomplished. Recent66studyshowthatwearefarmoreproductiveatworkifwetakeshortbreaks67regular.Giveyourbodyandbrainarestbysteppingoutsidefor68whileexercisingordoingsomethingyouenjoy. Ifyoufindsomethingyoulovedoingoutsideoftheofficeyou'llbelesslikely69bringyourworkhome.Itcouldbeanything﹣gardeningcookingmusicsports﹣butwhateveritis70makesureit'sarelieffromdailystressratherthananotherthingtoworryabout. 61. 62. 63. 64. 65. 66. 67. 68. 69. 70.
如图多面体ABCDEF中底面ABCD是菱形∠BCD＝60°四边形BDEF是正方形且DE⊥平面ABCD． Ⅰ求证CF∥平面ADE Ⅱ若AE＝求多面体ABCDEF的体积V．
在边长为4的正方形ABCD中AC与BD相交于O．减去△AOB将剩下部分沿OCOD折叠使OAOB重合则以ABCDO为顶点的四面体的体积为
设则f7的值为．
已知向量则“x＝﹣2”是“与反向”的
某小组同学在实验室研究Al与CuCl2溶液的反应． 1现象ⅰ中的红色物质是． 2经检验现象ⅱ中的无色气体为氢气． ①甲认为Al与H+反应产生了氢气用离子方程式表示溶液中存在大量H+的原因． ②氢气从红色物质表面逸出的原因是． 3探究白色沉淀的化学成分． 查阅资料Cu+可与浓氨水反应生成CuNH32+无色该无色物质在空气中易被氧化变为蓝色． 乙认为白色沉淀可能是CuCl并通过实验证明其猜测正确实验步骤如下 a．取白色沉淀充分洗涤 b．向其中加入浓氨水沉淀溶解得到无色溶液将无色溶液分为两份 c．取其中一份无色溶液… d．将另一份无色溶液放置于空气中一段时间后溶液变为蓝色． ①步骤c的实验方案是． ②用化学平衡移动原理解释CuCl溶于浓氨水的原因． 4探究CuCl产生的原因． ①丙猜测可能是Cu与CuCl2溶液反应生成了CuCl因为Cu具有性． ②取Cu粉与1mol/LCuCl2溶液混合无白色沉淀产生丙再次分析Al与CuCl2溶液反应的实验现象改进实验方案证明了Cu与CuCl2溶液反应生成了CuCl改进之处是．
已知双曲线的焦距为10点P12在C的渐近线上则C的方程为
屠呦呦1971年发现分离提纯并用于治疟新药“青蒿素”拯救了数千万人的生命．青蒿素分子结构如图．下列说法错误的是
如图在正方体ABCD﹣A1B1C1D1中MN分别是BC1CD1的中点则下列说法错误的是
下列函数在区间0+∞上为增函数的是
设log34•log48•log8m＝log416则m的值是
设集合U＝{012345}A＝{123}B＝{x∈Z|x2﹣5x+4≥0}则A∩∁UB＝
What'sOn? ElectricUnderground 7.30pm﹣1.00amFreeattheCyclopsTheatre Doyouknowwho'splayinginyourarea?We'rebringingyouaneveningofliverockandpopmusicfromthebestlocalbands.Areyouinterestedinbecomingamusicianandgettingarecordingcontract合同?Ifsocomeearlytothetalkat7.30pmbyJulesSkyeasuccessfulrecordproducer.He'sgoingtotalkabouthowyoucanfindtherightpersontoproduceyoumusic. GeeWhizz 8.30pm﹣10.30pmComedyatKaleidoscope ComeandseeGeeWhizzperform.He'sthefunnieststand﹣upcomedianonthecomedyscene.Thisjoyfulshowwillpleaseeveryonefromtheyoungesttotheoldest.GeeWhizzreallyknowshowtomakeyoulaugh!Ourbarisopenfrom7.00pmfordrinksandsnacks快餐. Simon'sWorkshop 5.00pm﹣7.30pmWednesdaysatVictoriaStage Thisisagoodchanceforanyonewhowantstolearnhowtodocomedy.Theworkshoplooksateverykindofcomedyandpracticesmanydifferentwaysofmakingpeoplelaugh.Simonisacomedianandactorwhohas10years'experienceofteachingcomedy.Hisworkshopsareexcitingandfun.AneveningwithSimonwillgiveyoutheconfidencetobefunny. CharlotteStone 8.00pm﹣11.00pmPizzaWorld Finefoodwithbeautifuljazzmusic;thisisagreateveningout.CharlotteStonewillperformsongsfromhernewbest﹣sellingCDwithJamesPickeringonthepiano.ThemenuisItalianwithexcellentmeatandfreshfishpizzasandpasta面食.Bookearlytogetatable.Ourbarisopenalldayandservescocktailscoffeebeerandwhitewine. 21.Whocanhelpyouifyouwanttohaveyourmusicproduced? A.JulesSkye.B.GeeWhizz. C.CharlotteStone.D.JamesPickering. 22.Atwhichplacecanpeopleofdifferentagesenjoyagoodlaugh? A.TheCyclopsTheatreB.Kaleidoscope C.VictoriaStageD.PizzaWorld 23.WhatdoweknowaboutSimon'sWorkshop? A.Itrequiresmembershipstatus. B.Itlaststhreehourseachtime. C.Itisrunbyacomedyclub. D.ItisheldeveryWednesday. 24.WhenwillCharlotteStoneperformhersongs? A.5.00pm﹣7.30pm. B.7.30pm﹣1.00am. C.8.00pm﹣11.00pm. D.8.30pm﹣10.30pm.
NA代表阿伏加德罗常数的数值下列说法正确的是
我国科学家在天然气脱硫研究方面取得了新进展利用如图装置可发生反应H2S+O2─H2O2+S↓． 已知甲池中发生的反应为下列说法正确的是
若fx和gx都是奇函数且Fx＝afx+bgx+2在0+∞上有最大值5则Fx在﹣∞0上
已知四棱锥P﹣ABCD底面ABCD是∠A＝60°的菱形又PD⊥底面ABCD点MN分别是棱ADPC的中点． Ⅰ证明DN∥平面PMB Ⅱ证明平面PMB⊥平面PAD．
假定你是李华你校摄影俱乐部photographyclub将举办国际中学摄影展.请给你的英国朋友Peter写封信.请他提供作品.信的内容包括: 1.主题:环境保护; 2.展览时间; 3.投稿邮箱:intlphotoshow@gmschool.com. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯.
JoyintheJourney Ifyouhaveeverbeendiscouragedbecauseoffailurepleasereadon.Foroftenachievingwhatyousetouttodoisnottheimportantthing.Letmeexplain. Twobrothersdecidedtodigadeepholebehindtheirhouse.Astheywereworkingacoupleofolderboysstoppedbyto1.Whatareyoudoing?askedoneofthevisitors.Weplantodigaholeallthewaythroughthe2!Oneofthebrothersvolunteered3. Theolderboysbeganto4tellingtheyoungeronesthatdiggingaholeallthewaythroughtheearthwas5.Afteralongsilenceoneofthe6pickedupajarfullofspiderswormsandmanyotherkindsofinsects.He7thelidandshowedthewonderful8tothescoffing嘲笑的visitors.Thenhesaidquietlyand9Evenifwedon'tdigallthewaythroughtheearthlookatwhatwehavefound10theway! Theirgoalwasfartooambitiousbutitdidcausethemtodig.Andthatis11agoalisfor﹣tocauseustomoveinthe12wehavechoseninotherwordstokeepus53!Butnoteverygoalwillbefully14.Noteveryjobwillend15.Noteveryhopewillcometopass.Noteverylovewilllast.Noteverydreamwillbe16.Butwhenyoufall17ofyouraimperhapsyoucansayYesbutlookatwhatIfoundalongtheway!Lookatthewonderfulthings18mylifebecauseItriedtodosomething!Itisinthedigging19lifeislived.AndIbelieveitisthejoyinthejourneyintheendthattruly20. 1.A.rest B.work C.watch D.laugh 2.A.house B.earth C.wall D.road 3.A.calmly B.patiently C.excitedly D.impatiently 4.A.laugh B.think C.stare D.smile 5.A.important B.difficult C.impossible D.interesting 6.A.passers﹣by B.watchers C.visitors D.diggers 7.A.pulled B.removed C.broke D.pushed 8.A.contents B.scenes C.pictures D.jars 9.A.properly B.confidently C.carefully D.happily 10.A.in B.along C.to D.out 11.A.what B.how C.where D.which 12.A.way B.direction C.life D.sight 13.A.thinking B.moving C.digging D.living 14.A.made B.prepared C.kicked D.achieved 15.A.hopelessly B.pleasantly C.surprisingly D.successfully 16.A.cometrue B.realized C.made D.treasured 17.A.short B.lost C.out D.behind 18.A.breakinginto B.turningto C.cominginto D.holdingto 19.A.when B.where C.which D.that 20.A.matters B.happens C.appears D.exists
Iwanttostartwiththeresponsibilityyouhavetoyourself.Everysingleoneofyouhassomethingthatyou'regoodat.Everysingleoneofyouhassomethingtooffer.Andyouhavearesponsibilitytoyourselftodiscoverwhatthatis.That'stheopportunityaneducationcanprovide. Maybeyoucouldbeagreatwriter﹣maybeevengoodenoughtowriteabookorarticlesinanewspaper﹣butyoumightnotknowituntilyouwritethatEnglishpaper﹣thatEnglishclasspaperthat'sassignedtoyou.Maybeyoucouldbeaninnovatororaninventor﹣maybeevengoodenoughtocomeupwiththenextiPhoneorthenewmedicineorvaccine﹣butyoumightnotknowituntilyoudoyourprojectforyourscienceclass.MaybeyoucouldbeamayororasenatororaSupremeCourtjustice﹣butyoumightnotknowthatuntilyoujoinstudentgovernmentorthedebateteam. AndnomatterwhatyouwanttodowithyourlifeIguaranteethatyou'llneedaneducationtodoit.Youwanttobeadoctororateacherorapoliceofficer?Youwanttobeanurseoranarchitectalawyeroramemberofourmilitary?You'regoingtoneedagoodeducationforeverysingleoneofthosecareers.Youcan'tdropoutofschoolandjustdropintoagoodjob.You'vegottotrainforitandworkforitandlearnforit. Andthisisn'tjustimportantforyourownlifeandyourownfuture.Whatyoumakeofyoureducationwilldecidenothinglessthanthefutureofthiscountry.ThefutureofAmericadependsonyou.Whatyou'relearninginschooltodaywilldeterminewhetherweasanationcanmeetourgreatestchallengesinthefuture. 1.Whatistheresponsibilityyouhavetoyourself? A.Todiscoverwhatthatis. B.TostudyforthefutureofAmerica. C.Tobeagreatwriter. D.Tobeateacher. 2.What'stheopportunityaneducationcanprovideaccordingtothepassage? A.Tobeapresident. B.Tobeamillionaire. C.Tobeamayororasenator. D.Tomeetgreatestchallenges. 3.Whatwillyouneedtodoforapoliceofficer? A.Tofindagoodjob. B.Toneedagoodeducation. C.Todropoutofschool. D.Tobetrained. 4.Themainideaofthispassageis. A.educationthatAmericacanprovide B.whatyouwanttodowithyourlife C.theimportanceofeducation D.responsibility
一个圆锥被过顶点的平面截去了较小的一部分余下的几何体的三视图如图则该几何体的体积为．
假定你是李华你校摄影俱乐部photographyclub将举办国际中学摄影展.请给你的英国朋友Peter写封信.请他提供作品.信的内容包括: 1.主题:环境保护; 2.展览时间; 3.投稿邮箱:intlphotoshow@gmschool.com. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯.
假定你校正在开展根除陋习创建文明校园活动.请你以此为主题用英语写一篇发言稿向全校学生倡议: 1.根除:乱扔垃圾浪费食物吸烟…2.提倡:讲礼貌互助… Dearfriends Asisknowntoallourschoolhaslaunchedacampaignagainstbadhabitsinordertobuildacivilizedcampus. That'sall.Thankyou.
Teacherssaythedigitalagehashadagoodinfluence﹣andanot﹣so﹣goodinfluence﹣onthisgenerationofAmericanteenagers.Morethan2000teacherstookanonlinesurvey.Three﹣quartersoftheteacherssaidtheInternetanddigitalsearchtoolshavehadamostlypositiveeffectontheirstudents'researchhabitsandskills.But64percentsaidthetechnologiesdomoretodistract使……分心studentsthantohelpthemacademically.And87percentagreedthatthesetechnologiesarecreatinganeasilydistractedgenerationwithshortattentionspans. ThePewInternetProjectdidthesurveywiththeNationalWritingProject.JudyBuchananisthevicedirectoroftheNationalWritingProjectandaco﹣authorofthereport.Ms.Buchanansaysdigitalresearchtoolsarehelpingstudentslearnmoreandfaster.Teachersreallyfavorthesetoolsbecausetheyarewaystomakesomeofthelearningexcitingandengaging.Youngpeoplefavorthesetools.Thegoalistoreallyhelpthembecomecreatorsofmeaningfulcontentandnotjustsortofconsumers. Butoneproblemthesurveyfoundisthatmanystudentslackdigitalliteracy.TheytrusttoomuchoftheinformationtheyfindontheInternet.Judysaysthesestudentshaven'tdevelopedtheskillstodeterminethequalityofonlineinformation.It'ssomethingthatreallyhastobetaughtandpaidattentionto.Becauseinaworldinwhichthingshappenquicklyyoudoneedtostepbackreflectandanalyzetheinformationyouhave. Anotherproblemisblamedonsomethingthatmightnotseemlikeaproblematall:beingabletoquicklyfindinformationonline.Teacherssaytheresultisareductioninthedesireandabilityoftheirstudentstoworkhardtofindanswers.Theysaystudentsareoverlydependentonsearchenginesanddonotmakeenoughuseofprintedbooksorresearchlibraries. ManyteachersarealsoconcernedthattheInternetmakesiteasyforstudentstocopyworkdonebyothersinsteadofusingtheirownabilities. 1.Thetextmainlytellsus. A.allthestudentsusedigitaltools B.theInternetisplayingakeyrole C.teachersencourageusingdigitaltools D.digitaltoolsbringaboutbenefitsandproblems 2.Whichofthefollowingbestshowsthestructureofthetext? ①＝Para1②＝Para2③＝Para3④＝Para4⑤＝Para5 3.Theunderlinedsentenceinthethirdparagraphprobablymeans. A.studentsdonothavetherightdigitaltools B.studentsdonotalwayshaveaccesstotheInternet C.studentshaven'ttheabilitytoadjustthemselves D.studentscan'tjudgeonlineinformationproperly 4.Somestudentsdon'ttendtoworkhardbecause. A.theycangetanswersontheInternetquickly B.printedbooksandlibrariesaroundaren'tenough C.theInternetcan'tmakestudentsconcentrate D.theycancopyeachothers'workwithoutbeingpunished
已知全集U＝RA＝{x|x＜1}B＝{x|x≥2}则集合∁UA∪B等于
Hundredsofpeoplehaveformedimpressionsofyouthroughthatlittledevice装置onyourdesk.Andthey'veneveractually41you.Everythingtheyknowaboutyou42throughthisdevicesometimesfromhundredsofmilesaway.43heyfeeltheycanknowyou44fromthesoundofyourvoice.That'showpowerfulthe45is. Powerfulyesbutnotalways46.ForyearsIdealtwithmytravelagentonlybyphone.RanimyfacelessagentwhomI'dnevermet47gotmerock﹣bottompricesonairfarescarsandhotels.Buthercoldvoicereally48me.Isometimeswishedto49anotheragent. OnemorningIhadto50animmediateflighthomeforafamilyemergency.IranintoRani'soffice51.Thewomansittingatthedesk52mymadnesssympatheticallyjumpedup.Shegavemea53smilenoddedwhilelisteningpatientlyandthenprintedoutthe54immediately.Whatawonderfullady!Ithought. Rushingout55IcalledoutovermyshoulderBythewaywhat'syourname?I'mRanishesaid.Iturnedaroundandsawa56womanwithabigsmileonherfacewavingtowishmeasafetrip.Iwas57!WhyhadIthoughtshewascold?Raniwaswellso58. SittingbackinthecaronthewaytotheairportIfigureditallout.Rani's59﹣﹣﹣herwarmsmilehernodsher‘I'mhereforyou'60﹣﹣﹣wereallsilentsignalsthatdidn'ttravelthroughwires. 41.A.accepted B.noticed C.heard D.met 42.A.came B.moved C.ran D.developed 43.A.Thus B.Yet C.Then D.Indeed 44.A.rather B.also C.just D.already 45.A.Telephone B.voice C.connection D.impression 46.A.direct B.useful C.easy D.accurate 47.A.inperson B.bymyself C.inpublic D.onpurpose 48.A.annoyed B.interested C.discouraged D.confused 49.A.promote B.train C.find D.know 50.A.arrange B.postpone C.confirm D.book 51.A.forthefirsttime B.atanytime C.fromtimetotime D.ingoodtime 52.A.expecting B.seeing C.testing D.avoiding 53.A.shy B.comforting C.familiar D.forced 54.A.bill B.form C.ticket D.list 55.A.hopefully B.disappointedly C.gratefully D.regretfully 56.A.careful B.serious C.nervous D.pleasant 57.A.amused B.worried C.helpless D.speechless 58.A.calm B.nice C.proud D.clever 59.A.forgiveness B.eagerness C.friendliness D.skillfulness 60.A.explanation B.attitude C.concept D.Behavior
已知ABCD是原子序数依次增大的四种短周期主族元素A的周期数等于其主族序数B原子的价电子排布为nsnnpnD是地壳中含量最多的元素．E是第四周期的p区元素且最外层只有2对成对电子F元素的基态原子第四能层只有一个电子其它能层均已充满电子． 1基态E原子的价电子排布图． 2BCD三元素第一电离能由大到小的顺序为用元素符号表示 3BD32﹣中心原子杂化轨道的类型为杂化CA4+的空间构型为用文字描述． 41molBC﹣中含有π键的数目为NA． 5DE元素最简单氢化物的稳定性＞填化学式理由是． 6CF两元素形成的某化合物的晶胞结构如右图所示则该化合物的化学式是C原子的配位数是．若相邻C原子和F原子间的距离为acm阿伏伽德罗常数为NA则该晶体的密度为g/cm3用含aNA的符号表示．
Readingcanbeasocialactivity.Thinkofthepeoplewhobelongtobookgroups.Theychoosebookstoreadandthenmeettodiscussthem.NowthewebsiteBookCrossing.comBookCrossing.comturnsthepageonthetraditionalideaofabookgroup. Membersgoonthesiteandregisterthebookstheyownandwouldliketoshare.BookCrossingprovidesanidentificationnumbertostickinsidethebook.Thenthepersonleavesitinapublicplacehopingthatthebookwillhaveanadventuretravelingfarandwidewitheachnewreaderwhofindsit. BrucePedersonthemanagingdirectorofBookCrossingsaysThetwothingsthatchangeyourlifearethepeopleyoumeetandbooksyouread.BookCrossingcombinesboth. Membersleavebooksonparkbenchesandbusesintrainstationsandcoffeeshops.Whoeverfindstheirbookwillgotothesiteandrecordwheretheyfoundit. Peoplewhofindabookcanalsoleaveajournalentrydescribingwhattheythoughtofit.E﹣mailsarethensenttotheBookCrossingtokeepthemupdatedaboutwheretheirbookshavebeenfound.Brucepetersonsaystheideaisforpeoplenottobeselfishbykeepingabooktogatherdustonashelfathome. BookCrossingispartofatrendamongpeoplewhowanttogetbacktotherealandnotthevirtual虚拟.Thesitenowhasmorethanonemillionmembersinmorethanonehundredthirty﹣fivecountries. 29.Whydoestheauthormentionbookgroupsinthefirstparagraph? A.Toexplainwhattheyare. B.TointroduceBookCrossing. C.Tostresstheimportanceofreading. D.Toencouragereaderstosharetheirideas. 30.WhatdoestheunderlinedworditinParagraph2referto? A.Thebook. B.Anadventure. C.Apublicplace. D.Theidentificationnumber. 31.WhatwillaBookCrosserdowithabookafterreadingit? A.Meetotherreaderstodiscussit. B.Keepitsafeinhisbookcase. C.Passitontoanotherreader. D.Mailitbacktoitsowner. 32.Whatisthebesttitleforthetext? A.OnlineReading:AVirtualTour B.ElectronicBooks:AnewTrend C.ABookGroupBringsTraditionBack D.AWebsiteLinksPeoplethroughBooks.
计算下列各式的值 1 2log3．
从古至今铁及其化合物在人类生产生活中的作用发生了巨大变化． 1古代中国四大发明之一的司南是由天然磁石制成的其主要成分是填字母 序号． a．Feb．FeOc．Fe3O4d．Fe2O3 2现代利用铁的氧化物循环裂解水制氢气的过程如下图所示．整个过程与温度密切相关当温度低于570℃时Fe3O4s和COg反应得到的产物是Fes和CO2g阻碍循环反应的进行． ①已知Fe3O4s+COg⇌3FeOs+CO2g△H1═+19.3kJ•mol﹣1 3FeOs+H2Og⇌Fe3O4s+H2g△H2═﹣57.2kJ•mol﹣1 Cs+CO2g⇌2COg△H3═+172.4kJ•mol﹣1 铁氧化物循环裂解水制氢气总反应的热化学方程式是． ②下图表示其他条件一定时Fe3O4s和COg反应达平衡时COg的体积百分含量随温度的变化关系． i．反应Fe3O4s+4COg⇌3Fes+4CO2g△H0填“＞”“＜”或“＝”理 由是． ii．随温度升高反应Fe3O4s+COg⇌3FeOs+CO2g平衡常数的变化趋势是1040℃时该反应的化学平衡常数的数值是． 3①古老而神奇的蓝色染料普鲁士蓝的合成方法如下 复分解反应ii的离子方程式是． ②如今基于普鲁士蓝合成原理可检测食品中CN﹣方案如下 若试纸变蓝则证明食品中含有CN﹣请解释检测时试纸中FeSO4的作用．
热门题库
更多
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
高一上学期物理
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
湘公网安备 43130202000226号