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Mak ing beers on the moon might seem like a pipe dream to many, but for a group of students from th...
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高一下学期英语《》真题及答案
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组成BCR复合体的成分是
mIg，CD21和CD19
mIg，CD79a和CD79b
CD81，CD21和CD19
mIg，CD40和CD40L
mIg，CD80和CD86
A.manwalkedintoasmallIrishpubandorderedthreebeers.
成熟B细胞BCR复合物的成分是
mIg、CD40和CD21
mIg、CD19和CD21
mIg、CD79α和CD79β
mIg、CD80和CD86
CD19、CD40和CD21
焊接机器人抗干扰能力差
不能采用TIG接方法
可以采用MIG接方法
必须采用MIG接方法
能采用MIG接方法
AmanwalkedintoasmallIrishpubandorderedthreebeers.T
MIG焊
AmanwalkedintoasmallIrishpubandorderedthreebeers.B
mIg的表达开始于骨髓中不成熟的B细胞B细胞成熟离开骨髓其mIg主要为mIgM和mIgD??
AmanwalkedintoasmallIrishpubandorderedthreebeers.B
Readingisthekeytosuccess.Apparentlyeverysuccessful
组成BCR复合体的成分是
mIg，CD21和CDl9
mIg，CD79a和CD79b
CD81，CD21和CDl9
mIg，CD40和CD40L
mIg，CD80和CD86
单词划线部分的读音和其他三个单词划线部分的读音不同请选出A.sing B.washes C.make
BCR复合物的组成是
由mIg多聚体组成
由mIg单体和Igα/Igβ异二聚体组成
由mIg单体和CD3组成
由mIg单体和CD4组成
由mIg单体和特异性抗原组成
mIg
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如图所示光滑水平轨道MN与半径为R的竖直光滑圆弧轨道相切于N点质量为m的小球B静止于P点小球半径远小于R．与B相同的小球A以速度v0向右运动同小球B发生弹性碰撞．求当v0在什么范围内小球B在圆弧轨道内运动时不会脱离轨道已知重力加速度为g．
我们电影节最初的想法诞生于1978年当时它被称为犹他州theUtah/美国电影节.
亚铁__{K4[FeCN6]}俗称黄血盐常用于检验Fe3+也是食盐防结剂．以生产电石的副产物氰熔体[CaCN2和NaCN的混合物]为原料制备亚铁__的流程如图1 回答下列问题 1“浸取”需控制在80C以下进行原因是． 2用硫酸亚铁晶体配制FeSO4溶液时还需加入． 3对“滤液”处理可获得一种实验室常用干燥剂它的化学式是． 4“加热”使HCN气体逸出发生“反应Ⅲ”生成亚铁__二氧化碳和氢气该反应化学方程式为． 5“反应Ⅲ”后的溶液经蒸发浓缩冷却结晶干燥即得产品． 6工业上以石墨为电极电解亚铁__溶液可以制备铁__{K3[FeCN6]可用于检验Fe2+}阳极的电极反应式为． 7设计如图象实验探究牺牲阳极的阴极保护法原理． 得出结论①锌能保护铁 ②．
水稻收获后要充分晾晒才能入库这样做的目的是
某同学在显微镜下测量蚕豆叶下表皮保卫细胞的长度时记录下了以下现象其中正确的是
NA代表阿伏加德罗常数的值．下列说法正确的是
如图所示质量为3m的重物与一质量为m的线框用一根绝缘细线连接起来挂在两个高度相同的定滑轮上已知线框的横边边长为L水平方向匀强磁场的磁感应强度为B磁场上下边界的距离线框竖直边长均为h．初始时刻磁场的下边缘和线框上边缘的高度差为2h将重物从静止开始释放线框上边缘刚进磁场时恰好做匀速直线运动滑轮质量摩擦阻力均不计．则下列说法中正确的是
甲乙两辆汽车沿同一平直路面行驶其v﹣t图象如图所示下列对汽车运动状况的描述正确的是
Upthemountainwiththehopeofbeingabletowatchthesunrise. A.climbedthetourists B.didthetouristsclimb C.thetouristsclimbed D.didclimbthetourists
降冰片二烯类化合物是一类太阳能储能材料．降冰片二烯在紫外线照射下可以发生下列转化．下列说法错误的是
Tolearntothinkistolearntoquestion.Thosewhodon'tquestionnevertrulythinkforthemselves.Thesearesimplerolesthathavegovernedtheadvancementofscienceandhumanthoughtsincethebeginningoftime.Advancementsaremadewhenthinkersquestiontheoriesandintroducenewones.Unfortunatelyitisoftenthegreatandrespectedthinkerswhoendupslowingtheprogressofhumanthought.Aristotlewasabrilliantphilosopherwhosetheoriesexplainedmuchofthenaturalworldoftenincorrectly.Hewassoesteemedbythescientificcommunitythateven1200yearsafterhisdeathscientistswerestilltryingtobuilduponhismistakesratherthancorrectthem! Brilliantmindscanintimidateup﹣and﹣comingthinkerswhoarenotconfidentoftheirabilities.TheyoftenbelievetheyareinferiortothemindsofgiantssuchasAristotleleadingmanytoacceptcurrentparadigmsinsteadofquestioningthem. Ilikemanythinkersofthepastoncebelievedinmymentalinferiority.Iwascertainthatmyparentsmyteachers﹣adultsingeneral﹣werealwaysright.TheywerelikeatextbooktomeIdidn'tquestionwhatwaswrittenonthosepages.Irespectedthemandacceptedwhatevertheytoldme.Butthatattitudesoonchanged.Mymind'sindependencewasfirststimulatedintheclassroom. Astern65﹣year﹣oldelementary﹣schoolscienceteacheroncetoldmethatlightisatypeofwave.Iconfidentlywentthroughyearsofschoolbelievingthatlightisawave.OnedayhoweverIheardtheGermanexchangestudentmentionthatlightcouldbemadeupofparticles.AstheotherslaughedathisstatementIstartedtoquestionmybeliefs. Maybetheteachersandtextbookshadn'tgivenmethewholestory.Iwenttothelibrarydidsomeresearchandlearnedofthelight﹣as﹣a﹣waveversuslight﹣as﹣a﹣particledebate.IreadaboutEinstein'sdiscoveryofthedualnatureoflightandlearnedthefactsofaparadox悖论thatpuzzlestheworld'sgreatestthinkerstothisday.Lightbehavesasbothaparticleandawaveitisbothatonce.IrealizedIhadgonethroughlifeacceptingonlyhalfofthestoryasthewholetroth. EachnewyearbroughtmorenewfactsandIformulatedevenmorequestions.IfoundmyselfinthelibraryafterschooltryingtofindmyownanswerstogainamorecompleteunderstandingofwhatIthoughtIalreadyknew.Idiscoveredthatmyparentsandteachersareincredibletoolsinmyquestforknowledgebuttheyareneverthefinalword.Eventextbookscanbechallenged.IlearnedtoquestionmysourcesIlearnedtobeathinker.IoncebelievedthateverythingIlearnedathomeandatschoolwascertainbutIhavenowdiscoveredtore﹣examinewhennecessary. QuestionsaresaidtobethepathtoknowledgeandtrothandIplantocontinuequestioning.Howmanythingsdoweknowforsuretodaythatwewillquestioninthefuture?AtthismomentIknowthatoursunwillbumforanotherfivebillionyearsandIknownothingcanescapethegravityofablackhole.Thisknowledgehowevermaychangeinthenext20years﹣maybeeveninthenexttwo.Theonethingwecancontrolnowisouropennesstodiscovery.Questionsarethetoolsofopenmindsandopenmindsarethekeytointellectualadvancement. 1WhatdoestheexampleofAristotleinthefirstparagraphshow? A.Advancementsaremadewhenthinkersquestiontheories. B.Greatthinkersoftenmakemistakesandthencorrectthem. C.Heisthegreatestandrespectedphilosopherofalltime. D.Hugeinfluenceofgreatthinkersmayblockhumanthought. 2TheunderlinedwordintimidateinParagraph2means. A.encourage B.frighten C.strength D.persuade 3Whydidtheauthorbegantoquestionhispreviousbeliefs? A.Hewasinspiredbythedifferentideasfromanexchangestudent. B.Whathelearnedfromtextbooksbeforeturnedouttobewrong. C.Hewasnotsatisfiedwithhislifeanddesperatetoachievesuccess. D.Hewaslaughedatbyotherstudentsforhisunacceptablestatement. 4Accordingtothepassagetheauthor. A.determinestobeathinkerandquestioner B.alwaysthrowshimselfintothelaboratory C.neverdoubtswhathehaslearnedinthetextbook D.looksdownupongreatthinkersallthetime 5Whatcanweconcludefromthelastparagraph? A.Wehumanbeingsdon'tdaretopredictfuture. B.Theauthorisnotquitesureabouthisfuture. C.Thetheoryofblackholeswillchangeintwoyears. D.Questioningisnecessarytopromoteadvancement. 6Whatdoesthepassagemainlytalkabout? A.Followingroles. B.Questioninggiants. C.Challengingyourself. D.Predictingfuture.
根据如图其他产物未写出分析下列说法正确的是
Inthatbookthewritercreatedavirtualworldreaderscantemporarilyescapefromtheirtroublesandhavetheirdreamscometrue. A.when B.which C.where D.how
在“验证平行四边形定则”的实验中用弹簧秤ab拉橡皮条的结点使其位于O点如图甲所示此时α+β＝90°其中弹簧秤a的读数是N如图乙所示．现保持a的读数不变减小α角且结点仍在O处则弹簧秤b的读数同时β角填“增大”“减小”或“不变”．
竖直面纸面内两固定长直导线L1L2中通有如图所示的电流P点位于L1L2正中间整个空间存在磁感应强度大小为B0方向垂直于纸面向里的匀强磁场未画出此时P点的磁感应强度大小为0．若L1中电流反向则P点的磁感应强度大小为B0方向垂直纸面向里则
化学与生产生活密切相关下列说法不正确的是
铁和铜都是日常生活中常见的金属有着广泛的用途．请回答下列问题 1配合物FeCOx常温下呈液态熔点为﹣20.5℃沸点为103℃易溶于非极性溶剂据此可判断FeCOx晶体属于填晶体类型FeCOx的中心原子价电子数与配体提供电子数之和为18则x＝Fe2+的核外电子排布式为． 2K3[FeCN6]溶液可用于检验填离子符号CN﹣中碳原子杂化轨道类型为1molCN﹣含有的π键数目为用N表示CNO第一电离能由大到小的顺序为用元素符号表示． 3某M原子的外围电子排布式为3s23p5铜与M形成的某化合物的晶胞结构如图所示黑点代表铜原子． ①该晶体的化学式为 ②已知铜和M的电负性分别为1.9和3.0则铜与M形成的化合物属于填“离子”或“共价”化合物． ③已知该晶体的密度为ρg•cm﹣3阿伏加德罗常数为NA则该晶体中铜原子和M原子之间的最短距离为pm只需写出计算式．
电渗析法淡化海水装置示意图如下电解槽中阴离子交换膜和阳离子交换膜相间排列将电解槽分隔成多个独立的间隔室海水充满在各个间隔室中．通电后一个间隔室的海水被淡化而其相邻间隔室的海水被浓缩从而实现了淡水和浓缩海水分离．下列说法正确的是
氢能被视为21世纪最具发展潜力的清洁能源开发高效储氢材料是氢能利用的重要研究方向． 1H3BNH3是一种潜在的储氢材料其中N原子的价电子轨道表达式为． 2制备H3BNH3的化学反应为3CH4+2HB＝NH3+6H2O→3CO2+6H3BNH3HB＝NH3是六元环状物质与其互为等电子体的有机物分子式为CH4H2OCO2的键角由大到小的顺序为BCNO第一电离能由大到小的顺序为 3C16S8是新型环烯类储氢材料研究证明其分子呈平面结构如图1所示． ①C16S8分子中C原子和S原子的杂化轨道类型分别为． ②测得C16S8中碳硫键的键长介于C﹣S和C＝S键之间其原因可能是． 4某种铜银合金晶体具有储氢功能它是面心立方最密堆积结构Cu原子位于面心Ag原子位于顶点H原子可进入由Cu原子和Ag原子构成的四面体空隙中．若将CuAg原子等同看待该晶体储氢后的晶胞结构与CaF2如图2相似该晶体储氢后的化学式为． 5MgH2是金属氢化物储氢材料其晶胞如图3所示已知该晶体的密度为ρg/cm3则该晶胞的体积为cm3用含ρNA的代数式表示．
一定质量的理想气体从状态M经历过程1或者过程2到达状态N其P﹣V图象如图所示．对于这两个过程下列说法正确的是 A．气体经历过程1其温度先升高后降低 B．气体在过程1中一直对外做功 C．气体经历过程2其内能先增大后减小 D．气体在过程2中一直对外放热 E．气体在过程1中吸收的热量大于过程2中吸收的热量
MariaRoseBeldinggrewupworkinginherchurch'spantry食品储藏inIowa. Jesussaid‘ForIwashungryandyoufedme.'…Stacking堆起canswasmy1tothiscallBeldingsaid. AsshegotolderBeldingrealizedthatfeedingthehungrywasn'tas2asitshouldbe.Thepantry'sshelves3withsomeitemswhileotherfoodsweredesperatelyneeded. In2009whenshewas14thepantryreceivedahuge4offoodthatwasmorethanthecommunitycould5andshesawhowharditwastocontactothercharitiesthatcouldtakeit. Monthslatershehadto6awayhundredsofexpired过期boxesaspeoplewaitedinlineforfood. Irememberjust7andbeingsoangrysaidBelding.Therewasnothingthatreallyallowedusto8inanefficientway…TheInternetwasfightinfrontofus! Beldinghadbeenfacedwithabig9﹣twoproblemsthatstillplague困扰theU.S.foodsystem.AccordingtotheUSDAmorethan40millionAmericansdon'tregularlyhave10toeatwhileupto40%ofthecountry'sfoodsupplyis11. Inhighschoolshedevelopedanideaforan12databasethatcouldsolvebothproblemsbutshedidn'thavetheprogramming13tomakeitwork.After14shemetGrantNelsonalawstudentwhowaswritingcodeonhislaptop. AboutninemonthslatertheylaunchedMEANSafreeplatformontheInternetthatconnectsbusinesseswith15foodtocharitiesthatfeedthehungry. RunlargelybyhighschoolandcollegestudentsMEANShashelped16morethan1.8millionpoundsoffoodsince2015. Toooftengrocerystoresandrestaurantsfindthemselvesthrowingoutfood17thereisgreatneedinnearby18Beldingsaid.MEANSaimstomakeiteasierto19foodthanthrowitinthedumpster…We'relikea20thathasn'texistedbefore. 1A.key B.drawback C.answer D.principle 2A.stable B.vital C.easy D.urgent 3A.bound B.provided C.rewarded D.overflowed 4A.supply B.donation C.restriction D.source 5A.use B.delay C.distribute D.twist 6A.put B.give C.throw D.melt 7A.splitting B.crying C.arguing D.crashing 8A.communicate B.relay C.reject D.wind 9A.revolution B.hurdle C.potential D.chance 10A.everything B.cheese C.enough D.diets 11A.wasted B.swelled C.boycotted D.violated 12A.obvious B.explicit C.online D.accessible 13A.correction B.skills C.laptop D.time 14A.relating B.subscribing C.casting D.graduating 15A.extra B.healthy C.fresh D.raw 16A.resemble B.redistribute C.reproduce D.resist 17A.when B.except C.because D.providing 18A.churches B.charities C.communities D.schools 19A.prepare B.consume C.handle D.donate 20A.carder B.restaurant C.machine D.bridge
下列实验能达到预期目的
镓是制作高性能半导体的重要原料．工业上常从锌矿冶炼的废渣中回收镓．已知某锌矿渣主要含ZnSiPbFeGa的氧化物利用该矿渣制镓的工艺流程如下 已知①镓在元素周期表中位于第四周期第ⅢA化学性质与铝相似．②lg2＝0.3lg3＝0.48．③部分物质的Ksp如F表所示． 1滤渣1的主要成分是写化学式． 2加入H2O2的目的是用离子方程式表示． 3调pH的目的是室温条件下若浸出液中各阳离子的浓度均为0.01mo/L当溶液中某种离子浓度小于1×10﹣5mol/L时即认为该离子已完全除去则pH应调节的范围为． 4操作D包括过滤洗涤干燥． 5制备精炼金属Ga． ①电解法制备金属镓．用惰性电极电解NaGaO2溶液即可制得金属镍写出阴极电极反应式． ②电解法精炼金属镓粗镓含ZnFeCu等杂质已知氧化性Zn2+＜Ga2+＜Fe2+＜Cu2+ 下列有关电解精炼金属镓的说法正确的是填字母序号． A．电解精炼镓时粗镓与电源的正极相连 B．电解精炼过程中阳极质量的减少与阴极质量的增加相等我的手机 C．电解后Cu和Fe沉积在电解槽底部形成阳极泥 D．若用甲烷燃料电池电解精炼金属镓当阴极有56.0g镓析出时电池负极最多消耗标准状态下的CH46.72L
罗马Roman字母表是希腊人的发明马拉松赛跑也是.这项长跑比赛是为了纪念一名希腊战士而创立的.
常温下将V0mL1mo/LHClO2和V0mL1mo/LHClO4两种酸溶液分别加水稀释稀释溶液体积为V稀释液pH与其体积变化的关系如图所示．下列说法正确的是
图甲为一列简谐横波在t＝0.10s时刻的波形图P是平衡位置为x＝1m处的质点Q是平衡位置为x＝4m处的质点图乙为质点Q的振动图象则下列说法正确的是 A．该波的周期是0.10s B．该波的传播速度为40m/s C．该波沿x轴的负方向传播 D．t＝0.10s时质点Q的速度方向向下 E．从t＝0.10s到t＝0.25s质点P通过的路程为30cm
Everydayweexperienceoneofthewondersoftheworldarounduswithoutevenrealizingit.Itisnottheamazingcomplexityoftelevisionnortheimpressivetechnologyoftransport.Theuniversalwonderweshareandexperienceisourabilitytomakenoisewithoutmouthsandsotransmitideasandthoughtstoeachother'sminds.①Thisabilitycomessonaturallythatwetendtoforgetwhatamiracleitis. ②Obviouslytheabilitytotalkissomethingthatmarkshumansofffromanimals.Ofcoursesomeanimalshavepowersjustasamazing.Birdscanflythousandsofmilesbyobservingpositionsofthestarsintheskyinrelationtothetimeofdayandyear.InNature'stalentshowhumansareaspeciesofanimalsthathavedevelopedtheirownspecialact.Ifwereduceittobasictermsit'sanabilityforcommunicatinginformationtoothersbyvaryingsoundswemakeaswebreatheout. ③Notthatwedon'thaveotherpowersofcommunication.Ourfacialexpressionsconveyouremotionssuchasangerorjoyordisappointment.Thewayweholdourheadscanindicatetootherswhetherwearehappyorsad.Thisisso﹣calledbodylanguage.Bristling直立的furisanunmistakablewarningofattackamongmanyanimals.Similarlythebowedheadordroopingtailshowsareadinesstotakesecondplaceinanyanimalgathering. Suchameansofcommunicationisabasicmechanismthatanimalsincludinghumanbeingsinstinctively本能地acquireanddisplay④Ifsohowdidhumanbeingsacquirethisamazingskills?Biologistscanreadilyindicatethatparticularareaofourbrainwherespeechmechanismsfunctionbutthisdoesn'ttellushowthatpartofourbodiesoriginatedinourbiologicalhistory. 1WhichblankisthemostsuitableforIstheabilitytospeakjustanothersortofinstinct? A.① B.② C.③ D.④ 2Accordingtothepassagethewonderwetakeforgrantedis. A.ourabilitytouselanguage B.ourabilitytomakenoiseswithmouth C.theunforgettablemiracleofnature D.theamazingpoweroftechnology 3Whatisthispassagemainlyabout? A.Thedevelopmentofbodylanguage. B.Thepowertoconveyinformationtoothers. C.Thespecialrolehumansplayinnature. D.Thedifferencebetweenhumansandanimals.
一些骑自行车的人认为交通规则对他们不适用但这是不正确的.
在平面直角坐标系的x轴上关于原点O对称的PQ两点各放一个等量点电荷后x轴上各点电场强度E随坐标x的变化曲线如图所示．规定沿x轴正向为场强的正方向则下列说法正确的是
在日常生活中下列做法值得提倡的是
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