首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
女娄菜（2N＝46）为XY型性别决定植物，其高茎与矮茎受基因A、a控制，叶片的颜色绿色与金黄色受基因B、b控制某研究小组用一对表现型均为绿色高茎的雌雄植株进行杂交实验，统计子代的表现型及比例如下： ...
查看本题答案
包含此试题的试卷
高三下学期生物《》真题及答案
点击查看
你可能感兴趣的试题
某种植物的表现型有高茎和矮茎紫花和白花其中紫花和白花这对相对性状由两对等位基因控制这两对等位基因中任
某种异花授粉的植物高茎T对矮茎t为显性绿色R对紫色r为显性在该植物的随机授粉的物种中表现型及比例为高
48%；9%
36%；9%
36%；25%
60%；25%
3.00分女娄菜的性别决定方式为XY型其植株高茎和矮茎受基因Aa控制宽叶和狭叶受基因Bb控制．现将
a控制，宽叶和狭叶受基因
b控制．现将两株女娄菜杂交，所得子代雌株中高茎宽叶：矮茎宽叶=3：1．雄株中高茎宽叶：高茎窄叶：矮茎宽叶：矮茎窄叶=3：3：1：1．相关判断错误的是（ ）
A．两对基因的遗传遵循自由组合定律
B．亲本的基因型为AaX
B
X
b
．AaX
B
Y
子代雌株中髙茎宽叶基因型有4种
子代雄株髙茎宽叶中纯合子占
31.13分某多年生植物的性别是由性染色体XY决定的现有一对相对性状高茎A.与矮茎a但不知道其基因在
某植物中紫花和白花这对相对性状由两对等位基因A./a和B./b控制两对等位基因中的任意一对为隐性纯合
科研人员对某一年生植物2n=24与豌豆的传粉和授粉方式相同的多种性状进行研究发现有的受一对基因控制有
某多年生植物的性别是由性染色体XY决定的现有一对相对性状高茎A与矮茎a但不知道其基因在常染色体还是在
某种植物的表现型有高茎和矮茎紫花和白花其中紫花和白花这对相对性状由两对等位基因控制这两对等位基因中任
某多年生植物的性别是由性染色体XY决定的现有一对相对性状高茎A与矮茎a但不知道其基因在常染色体还是在
已知某闭花授粉植物2n=28高茎D对矮茎d为显性在♀DD×♂dd杂交中若D基因所在的同源染色体在减数
13或15 高茎或矮茎
14 高茎或矮茎
13或15 高茎
14 高茎
某多年生植物的性别是由性染色体XY决定的现有一对相对性状高茎A.与矮茎a但不知道其基因在常染色体还是
女娄菜为XY型性别决定植物控制其株型的基因A.a位于常染色体上控制其叶色的基因B.b位于性染色体上带
某种植物的表现型有高茎和矮茎紫花和白花其中紫花和白花这对相对性状由两对等位基因控制这两对等位基因中任
科研人员对某一年生植物2n=24与豌豆的传粉和授粉方式相同的多种性状进行研究发现有的受一对基因控制有
某种植物的表现型有高茎和矮茎紫花和白花其中紫花和白花这对相对性状由两对等位基因控制这两对等位基因中任
某多年生植物的性别是由性染色体XY决定的现有一对相对性状高茎A与矮茎a但不知道其基因在常染色体还是在
豌豆的高茎和矮茎为一对相对性状下列杂交试验中能判定其显隐性关系的是
高茎×高茎→高茎
矮茎×矮茎→矮茎
高茎×高茎→787高茎：277矮茎
高茎×矮茎→30高茎：34矮茎
某种植物的表现型有高茎和矮茎紫花和白花其中紫花和白花这对相对性状由两对等位基因控制这两对等位基因中任
某多年生植物的性别是由性染色体XY决定的现有一对相对性状高茎A与矮茎a但不知道其基因在常染色体还是在
某种植物的表现型有高茎和矮茎紫花和白花其中紫花和白花这对相对性状由两对等位基因控制这两对等位基因中任
热门试题
更多
如图倾斜固定直杆与水平方向成60°角直杆上套有一个圆环圆环通过一根细线与一只小球相连接．当圆环沿直杆下滑时小球与圆环保持相对静止细线伸直且与竖直方向成30°角．下列说法中正确的是
嫦娥系列卫星靠近月球时被月球引力捕获经过椭圆轨道Ⅰ和Ⅱ的调整最终进入近月圆轨道Ⅲ并开展对月球的探测P为三个轨道的相切点下列说法正确的是
根据中学所学相关知识下列推断正确的一项是
如图为某种透明材料做成的三棱镜横截面其形状是边长为a的等边三角形现用一束宽度为a的单色平行光束以垂直于BC面的方向正好入射到该三棱镜的AB及AC面上结果所有从ABAC面入射的光线进入后恰好全部直接到达BC面．试求1该材料对此平行光束的折射率2这些到达BC面的光线从BC面折射而出后如果照射到一块平行于BC面的屏上形成光斑则当屏到BC面的距离d满足什么条件时此光斑分为两块
10分ErnestHemingwaywasnotonlyacommandingfigurein20th﹣centuryliteraturebutwasalsoapackrat.Hesavedevenhisoldpassportsandusedbullfightticketsleavingbehindoneofthelongestpapertrailsofanyauthor. ErnestHemingway:BetweenTwoWarswhichopensonFridayattheMorganLibrary&MuseumisthefirstmajormuseumexhibitiondevotedtoHemingwayandhiswork.Thelargestandmostinterestingsectionfocusesonthe'20sHemingway'sParisyearsandrevealsawriterwemighthavebeenindangerofforgetting:HemingwaybeforehebecameHemingway. TheexhibitiondoesnotfailtoincludepicturesofthebeardedmanlyHem.He'sshownposingwithsomekuduhehasjustshotinAfricaandonthebridgeofhisbelovedfishingboatthePilarwithCarlosGutiérrezthefishermanwhobecamethemodelforTheOldManandtheSea.Butthefirstphototheviewerseesisabigblowupofahandsomeclean﹣shaven19﹣year﹣oldstandingoncrutches.Thisisfromthesummerof1918whenHemingwaywasrecoveringfromwoundsattheRedCrosshospitalinMilanandtryingtoturnhiswartimeexperiencesintofiction. Theevidenceatthisexhibitionsuggeststhatintheearlydaysheoftenwroteinpencilmostlyincheapnotebooksbutsometimesonwhateverpapercametohand.ThefirstdraftoftheshortstorySoldier'sHomewaswrittenonsheetsheappearedtohavesnatchedfromatelegraphoffice.Theimpressionyougetisofayoungwriterseizedbyinspirationandsometimesbarrelingaheadwithoutanentirelyclearsenseofwhereheisgoing. F.ScottFitzgeraldsomeofwhoseletterswithHemingwayisalsoonviewfamouslyurgedhimtocutthefirsttwochaptersofTheSunAlsoRisescomplainingabouttheelephantinefacetiousnessofthebeginningandHemingwayobligedgettingridofaclunkyopeningthatnowseemsalmostmeta.In1929inanine﹣pagepenciledcritiqueFitzgeraldalsosuggestednumerousrevisionsforAFarewelltoArms.HemingwaytooksomeofthesebutlessgraciouslyandsoonafterwardhisfriendshipwithFitzgeraldcametoanend. ThepapersattheMorganshowaHemingwaywhoisnotalwayssureofhimself.Therearerunninglistsofstorieshekeptfiddlingwithandtherearelistsandlistsofpossibletitlesincludingthe45heconsideredforFarewelland47differentendingsforthenovel. IndisplaycaseafterdisplaycaseyouseeHemingwayduringhisParisyearsinventingandreinventinghimselfdiscoveringashegoesalongjustwhatkindofwriterhewantstobe.Inamoving1925lettertohisparentswhorefusedtoreadInOurTimehissecondstorycollectionhewrites:YouseeI'mtryinginallmystoriestogetthefeelingoftheactuallifeacross﹣notjusttodescribelife﹣orcriticizeit﹣buttoactuallymakeitalive.Sothatwhenyouhavereadsomethingbymeyouactuallyexperiencethething.Youcan'tdothiswithoutputtinginthebadandtheuglyaswellaswhatisbeautiful. BythetimetheSecondWorldWarbrokeoutHemingwayhadsolidifiedintotheiconicfigurewenowremember:Papa.EvenJ.D.Salingercallshimthis.AndablusterycrankyHemingwayappearsin1949whenaboardthePilarhegrabsanoldfishingdiaryandbeginsscrawlinganangrylettertoHaroldRosstheeditorofTheNewYorkercomplainingaboutAlfredKazin'sreviewofAcrosstheRiverandIntotheTreesnotintruthaverygoodbook.ButHemingwayoftendrinkinganddepresseddidn'tknowithisbestworkwasbehindhimbythen. 66.Whichofthefollowingisclosestinmeaningtotheunderlinedwordsapackratpara.1? A.apersonwhoenjoyscollectingthings B.apersonwhocannotbereliedon C.apersonwholikestocollectrubbish D.apersonwhodoesn'twasteanything 67.HowmanyofHemingway'sworksarementionedinthispassage? A.4B.5C.7D.6 68.WecanconcludefromtheMorganshowthatsometimesHemingwaywasaperson A.stubbornbutfullofenthusiasmaboutlove B.unconfidentbutfullofinspirations C.casualbutfullofheroism D.bad﹣temperedbutfullofstrangehabits 69.WhatdoesthewritertrulymeanbysayingHemingwaybeforehebecameHemingway? A.Hemingwaywrotemanymasterpiecesbeforehekilledhimself. B.Hemingwaywasonceawarcorrespondentbeforehebecameafamouswriter. C.HemingwaydevotedallhisstrengthstowritingbeforehewontheNobelPrize. D.Hemingwaykeptexploringtheworldandadjustinghimselfbeforehebecameacommandingfigureinliterature. 70.AccordingtotheMorganshowreadersarelikelytoseeinHemingway'sworks. ①toughmenwhocan'tbedefeated ②anti﹣warfighters ③thedarksideoftheworldaswellasitsbeauty ④loveaffairsbetweenamanandawoman ⑤thestoryofafamilybusiness A.①⑤B.②④C.①③D.③⑤
25分阅读下面的短文然后按照要求写一篇150词左右的英语短文. Whatcanyoudowhenyouareunhappy?Ifyouwanttoletoutyourangerorpressurebybreakingthingsyoujustdo.NowaschoolinNanjinghasbuiltastresswalltohelpstudentswhofeelunhappyduetoheavyschoolworkorforotherreasons. Theleaderoftheschoolsaidtheideaofastresswallstartedwhenfootprintswerefoundonsomenewlypaintedwallsandsomeschoolwindowswerebroken. Thesethingshappenbecausesomestudentsfeellotsofpressurefromtheirstudiesorbecausetheydon'tgetalongwellwithotherstudents.Whenunderstressthebodygetsreadytoeitherrunorfightandbecomesverynervous.Hittingthewallcanhelprelaxthebodyandtakeawaystresshesaid. TestsandhomeworkmakemesadsaidajuniorgirlIcan'twaittohitthewall.Itwillhelpmealotwithmyproblems.Howeveranothergirlstudentwhowouldn'tgivehernamesaidThewallwon'thelpbecauseitcan'ttalkandsheaddedIneedtotalktosomeonewhenI'msad. 【写作内容】 1.以约30个词概括这段短文内容 2.以约120个词就Shouldthestresswallbebulit主题发表你的看法包括以下要点: 1学生的压力来源 2是否该建此墙并说明理由 3提供一些其他有效的减压方法. 【写作要求】 1.可以参照阅读材料但不得直接引用原文的句子 2.作文中不得出现真实的姓名和学校名称. 【评分标准】 概括准确语言规范内容合适篇章连贯.
日常用牙膏的主要成分有活性物质摩擦剂甘油等假设牙膏中的摩擦剂成分为CaCO3SiO2AlOH3中的一种或几种物质组成牙膏中其他成分均可溶于盐酸且无气体产生 1牙膏中添加甘油主要作用 为进一步炭疽牙膏中摩擦剂成分进行了以下探究 Ⅰ．摩擦剂成分的定性检验 设计实验方案验证假设请写出实验步骤以及预期现象和结论可不填满也可补充可选的试剂稀盐酸稀硫酸NaOH溶液澄清石灰水 Ⅱ．牙膏样品中碳酸钙的定量测定 利用如图所示装置图中夹持仪器略去进行实验充分反应后测定C中生成的BaCO3沉淀质量以确定碳酸钙的质量分数 依据实验过程回答下列问题 2实验过程中需持续缓缓通入空气其主要作用 3仪器C中选择BaOH2而不选择CaOH2溶液原因①② 4下列各项措施中能提高测定准确经度的是填标号 a．在加入盐酸之前应排净装置内的CO2气体 b．缓慢滴加稀盐酸 c．在A﹣B之间增添盛有浓硫酸的洗气装置 d．在B﹣C之间增添盛有饱和碳酸氢钠溶液的洗气装置 5实验中准确称取1.00g样品三份进行三次测定测得BaCO2平均质量为3.94g测样品中碳酸钙的质量分数为若改测定C中生成BaCO2的质量分数两方法测定的结果填“相同”或“不同”原因是
关于下列各装置图略去部分夹持仪器的叙述中正确的是
8分Themostcomplexobjectknowntohumanityisthehumanbrain﹣andnotonlyisitcomplexbutitisoneofthefewnaturalphenomenathatsciencehasnoconsciousnessof.Totrytoreplicate复制somethingthatissopoorlyunderstoodmaythereforeseemlikepride.ButyouhavetostartsomewhereandInternationalBusinessMachinesIBMandtheEcolePolytechniqueFederaledeLausanneEPFLinSwitzerlandproposetostartbyreplicating'insilico'oneofthebrain'sbuildingblocks.Inapartnershipannouncedthetwoorganizationssaidtheywouldbeworkingtogethertobuildasimulation模拟ofastructureknownasaneo﹣cortical新大脑皮质的columnonatypeofIBMsupercomputerthatiscurrentlyusedtostudythemolecularfunctioningofgenes.Ifthatworkstheyplantousemorepowerfulcomputerstolinksuchsimulatedcolumnstogetherintosomethingthatmimics模仿abrain.Inarealbrainaneo﹣corticalcolumnisacylindrical圆柱形的elementaboutathirdofamillimeterindiameterandthreemillimeterslong.Itisthesecolumnsarrangedsidebysidelikethecellsofahoneycombwhichmakeupthefamous'greymatter'thathasbecomeshorthandforhumanintelligence.TheBlueGene/Lsupercomputerthatwillbeusedforthesimulationconsistsofenoughindependentprocessorsforeachtobeprogrammedtomimicanindividualnervecellinacolumn.TheEPFL'scontributiontotheBlueBrainProjectwillbetocreateadigitaldescriptionofhowthecolumnsbehave.ThedatabasefromitsBrainMindInstitutewillprovidetherawmaterialforthesimulation.Biologistsandcomputerscientistswillthenconnecttheartificialnervecellsupinawaythatmimicsnature.Theywilldosobyassigningelectricalproperties电能tothemandtellingthemhowtocommunicatewitheachotherandhowtheyshouldmodifytheirconnectionswithoneanotherdependingontheiractivity.Thatwillbenomeanfeat.Evenasinglenervecelliscomplicatednotleastbecauseeachonehasabout10000connectionswithothers.Andnervecellscomeingreatvariety﹣relyingforexampleondifferentchemicaltransmitterstocarrymessagesacrossthoseconnections.EventuallyhoweveradigitalrepresentationofanentirecolumnShouldoccur.AssumingthatthegrowthofcomputingpowercontinuestofollowMoore'sLawtheleaderofIBM'ssidethinksitshouldbepracticaltomimicanentirehumanbraininsilicothiswayintentofifteenyears.Suchanartificialbrainwouldofcoursebeapowerfulresearchtool.Itwouldallowneurologicalexperimentsthatcurrentlytakedaysina'weblab'tobeconductedinseconds.Theresearchershopethattheirsimulatedbrainwillrevealthesecretsofhowcertainpsychiatricandneurologicaldisordersdevelop.Butthatisprobablynottherealreasonfordoingit.Themostinterestingquestionsurelyiswhethersuchanartificialbrainwillbeintelligentorconsciousorboth. 59.Inarealbrainaneo﹣corticalcolumn.A.containsalargenumberofnervecellsB.isasimulationofastructureC.isthefamous'greymatter'D.lookslikethecellsofahoneycomb 60.Whatdoestheunderlinedsentence'Thatwillbenomeanfeat'inParagraph5indicate?A.Thefunctionofchemicaltransmittersishardtounderstand.B.Itisratherdifficulttoconnecttheartificialnervecellsup.C.Adigitalrepresentationofanentirecolumnistime﹣consuming.D.Asinglenervecelliscomplicatedtoidentifyacrossconnections. 61.Thefundamentalpurposeofdoingtheresearchisprobably.A.tosimulateanentirehumanbraininsilicoB.totellushowsomecertaindisordersemergeC.todiscoverhowtheartificialbrainwouldworkD.toexaminewhetherMoore'sLawisstillfunctioning 62.Whattypeofwritingisthispassage?A.AsciencefictionB.AcomputeradvertisementC.AnofficialdocumentD.Aresearchreport.
在真空中AB两点分别放有异种点电荷+Q和﹣2Q以AB连线中点O为圆心作一圆形路径abcd如图所示则下列说法正确的是
设mn是两条不同的直线αβγ是三个不同的平面则下列命题为假命题的是
1分﹣JackhowcanIturnonthisipod? ﹣ A.Allowme! B.Sowhat? C.Whyme! D.Nothingmuch.
TWXYZ为前四周期元素其原子序数依次增大有关五种元素的性质或原子结构描述如下 1Z元素位子周期表中第_族其基态原子的价层电子排布式为 2T的一种化合物为T2H4该分子中极性键和非极性键的数目之比为T的最低价氢化物与其最高价氧化物的水化物能发生化合反应其产物属于晶体 3WX和Y三种元素中第一电离能最小的为填元素符号WX和Y的简单离子的半径从小到大的顺序为用离子符号表示 4Z与水蒸气反应的化学方程式为
1分Itisanywonderthathisfrienddoesn'tlikewatchingtelevisionmuch. A.hopefully B.merely C.nearly D.hardly
如图在三棱锥P﹣ABC中DEF分别是侧棱PAPBPC的中点．给出下列三个结论①BC∥平面DEF②平面DEF∥平面ABC③三棱锥P﹣DEF与三棱锥P﹣ABC的体积比为14．其中正确的个数是
如图所示匀强电场场强方向与水平方向夹角为θ＝450场中有一质量为m电荷量为q的带电小球用长为L的细线悬挂于O点．当小球静止平衡时细线恰好水平．现用一外力将小球沿圆弧缓慢拉到竖直方向最低点小球电荷量不变则在此过程中
下列叙述Ⅰ和Ⅱ均正确并且有因果关系的是
1分WithoutthetwoassistantsatmycommandIthedeadline. A.wouldn'tmeet B.wouldn'tbemet C.wouldn'thavemet D.wouldn'thavebeenmet
如图所示用轻质活塞在气缸内封闭一定质量的理想气体活塞与气缸壁之间的摩擦忽略不计．开始时活塞距气缸底的高度为h1＝0.50m气体温度为t1＝27℃．给气缸加热活塞缓慢上升到距气缸底的高度为h2＝0.80m处时缸内气体吸收Q＝450J的热量．已知活塞横截面积S＝5.0×10﹣3m2大气压强P0＝1.0×105Pa．求①加热后缸内气体的温度．②此过程中缸内气体增加的内能△U．
气体的自动化检测中常常应用原电池原理的传感器．如图为电池的工作示意图气体扩散进入传感器在敏感电极上发生反应传感器就会接收到电信号．下表列出了待测气体及敏感电极上部分反应产物．则下列说法中正确的是
已知NaHSO3溶液在不同温度下均可被过量KIO3氧化当NaHSO3完全消耗即有I2析出依据I2析出所需时间可以求得NaHSO3的反应速率．将浓度均为0.020mol•L﹣1的NaHSO3溶液含少量淀粉10.0mLKIO3过量酸性溶液40.0mL混合记录10～55℃间溶液变蓝时间55℃时未观察到溶液变蓝实验结果如图．据图分析下列判断不正确的是
某课题小组合成一种复合材料的基体M的结构简式为 1写出A的结构简式②的反应类型为 2B中含有的官能团有D的名称系统命名是 3写出反应③的化学方程式 4写出符合下列条件①能使FeCl3溶液显紫色②苯环只有二个取代基③与新制的CuOH2悬浊液混合加热有砖红色沉淀生成④苯环上一氯化物有2种同分异构体写出有机物B的一种同分异构体的结构简式 5下列说法正确的是 a．E与分子式相同的醛互为同分异构体 b．F的分子式为C2H2NO c．CH2CHNH2能与盐酸反应 d．C分子中苯环上取代基有2个π键
我校开展学生自己动手进行实验操作的活动．同学们现要测定电阻Rx的阻值电阻值约为100Ω以及一节干电池的电动势和内阻内阻约为2Ω除此之外还备有如下器材A．电压表V量程为2V内阻较大B．电阻箱R1总阻值为9999.9ΩC．开关导线若干1为了较准确地测定Rx的电阻值电池的电动势和内阻王华同学选择如图1所示的电路．2王华同学根据电路图连接实物图后测定电阻Rx时主要进行了两步实验．第1步闭合S1和S3断开S2记录电压表示数U1第2步闭合S1和S2断开S3调节R1使电压表示数仍为U1记录此时R1的阻值r2则被测电阻Rx的电阻值为．3通过改变电路的总电阻记录外电阻的总电阻值R和对应情况下的电压表示数U画出随变化的图线为直线如图2所示直线与纵轴的交点坐标为b斜率为k则电源电动势为内阻为从实验原理来看实验测量值与真实值相比较电动势内阻后两空填偏大偏小或不变．
20分Iwalkedoutonmyporchthismorningtothewonderfulsightofthesunrisingoverthemountains.Ismiledasitsgoldenbeams36theclearbluesky.Mylightjacketwasunbuttonedandthemorningbreezefeltwarmandconforting.Thetreeswerestillbareofanybuds37Icouldfeelasenseofthecoming38onthiswinterday.IbreathedinthefreshairandthankedGodforthisgloriousdaytobealive. Ithoughttheonlyonething39thatwouldmakethisaperfectmoment:alittlemorning40. ThensuddenlyIheardit.Godhadgrantedmy41.Themorningmusichadarrived.Itwasthefirstbirdsongsoftheyear.Afterthecoldandsilentmorningsofwinter42couldhavesoundedsweeter.Themusicwascomingfromeverydirection.Thebirdsweresingingfor43forjoyandforGod. Theywerecallingonspringtohurryalongandlifeto44thisworldoncemore.Istoodstillandjustlistened.Icouldfeelmyownsoul45toHeaven'sjoyandmyownheartfillingwithGod'slove.It46wasaperfectmoment. Sometimesweall47theharshnessofwinterinourlives.Sometimesweallfeel48deadandquietinside.Sometimesweall49wherethemusichasgone.Itisthenhoweverthatweneedtotellthelittlebirdinoursoulstosing50.ItisthenthatweneedtoaskGodto51uswithhisloveandhismusic.Itisthenthatweneedtoawakenour52springandshareitslifeandwarmthwiththeworld. Ihopethatyoualways53thetimetohearthebirdssinginginthetreesandthebirdsinginginyoursoul.Ihopethatyoufillyourdayswithsongsofjoy54ofloveandthoughtsofGod.Ihopethatyou55everydayofyourlifeherewithalittlemorningmusicandcarryitsheavenlymelodyinyourheartalldaylong. 36.A.litup B.putup C.tookup D.sentup 37.A.and B.so C.for D.but 38.A.warmth B.excitement C.spring D.moment 39.A.sweet B.missing C.glorious D.tough 40.A.sunlight B.greeting C.bird D.music 41.A.morning B.thought C.wish D.song 42.A.nothing B.it C.all D.little 43.A.food B.love C.comfort D.friendship 44.A.turnover B.returnto C.passby D.sweepup 45.A.awakening B.reacting C.contributing D.referring 46.A.eventually B.truely C.fortunately D.approximately 47.A.getover B.getthrough C.goover D.gothrough 48.A.disappointed B.cold C.scared D.ashamed 49.A.understand B.appreciate C.wonder D.conclude 50.A.afterall B.onceagain C.forgood D.sofar 51.A.inspire B.equip C.provide D.fill 52.A.promising B.longing C.inner D.coming 53.A.risk B.save C.kill D.take 54.A.commitments B.acts C.occasions D.attacks 55.A.devote B.replace C.start D.spare.
已知如图为某三棱锥的三视图则该三棱锥的表面积为
常温下下列说法正确的是
下列说法正确的是
1分﹣﹣﹣HiTom.DoesJohnhaveanyhobbies? ﹣﹣﹣swimmingwillappealtohimmoststrongly. A.Ifanything B.Ifever C.Ifany D.Ifso
如图所示间距为L的水平平行金属导轨上连有一定值电阻阻值为R两质量均为m的导体棒ab和cd垂直放置在导轨上两导体棒电阻均为R棒与导轨间动摩擦因数均为μ导轨电阻不计最大静摩擦力等于滑动摩擦力整个导轨处在竖直向下的匀强磁场中磁感应强度为B．现用某一水平恒力向右拉导体棒ab使其从静止开始运动当棒ab匀速运动时棒cd恰要开始滑动从开始运动到匀速的过程中流过棒ab的电荷量为q重力加速度为g求1棒ab匀速运动的速度大小2棒ab从开始运动到匀速运动所经历的时间是多少3棒ab从开始运动到匀速的过程中棒ab产生的焦耳热是多少
在普通的纤维面料中加入一层“纳米Ti02”可生产自洁面料工业上用钛铁矿主要成分为FeTi03含Fe203Fe0Si02等杂质制取纳米级Ti02的简要流程如下 1上述流程中分离出残渣的操作名称是 2试剂b的化学式是加入过量该试剂的目的是 3③中加热的目的是用化学用语结合必要的文字进行说明 4如下图所示以熔融Ca0为电解液电解Ti02可获得Ti．电解时阳极的电极反应式是 5已知25℃101kPa时Cs+O2g═CO2g△H1＝﹣393.5kJ/mol 2COg+O2g═2CO2g△H2＝﹣566kJ/mol TiO2s+2Cl2g═TiCl41+O2g△H3＝+140kJ/mol 则TiO2s+2Cl2g+2Cs═TiCl41+2COg的△H＝
热门题库
更多
高三上学期化学
高二下学期化学
高二下学期生物
高三下学期生物
高三下学期化学
高三上学期英语
高二下学期英语
教案备课库
高三下学期英语
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
国际法
教案备课库
湘公网安备 43130202000226号