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根据所给中文意思完成句子,每空限填一词. 火车再一次晚点. , the train was late.
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1990年4月25日科学家将哈勃天文望远镜送上距地球表面约600km的高空使得人类对宇宙中星体的观测与研究有了极大的进展．假设哈勃望远镜沿圆轨道绕地球运行．已知地球半径为6.4×106m利用地球同步卫星与地球表面的距离为3.6×107m这一事实可得到哈勃望远镜绕地球运行的周期．以下数据中最接近其运行周期的是
下列图示与对应的叙述相符的是
随着科技的发展未来的航空母舰上将安装电磁弹射器以缩短飞机的起飞距离．如图所示航空母舰的水平跑道总长＝112.5m其中电磁弹射区的长度l1＝100m在弹射区域安装有直线电机假设该电机为飞机提供一个恒定的牵引力F牵．一架质量m＝2.0×104kg的飞机其喷气式发动机可以提供恒定的推力F推＝1.2×105N．假设飞机在跑道所受阻力大小恒为飞机重力的0.2倍飞机离舰起飞的速度为v＝70m/s．设航空母舰始终处于静止状态飞机可看做质量恒定的质点g取10m/s2．求 1飞机在后一阶段的加速度大小 2电磁弹射器的牵引力F牵的大小．
直接排放SO2NO2会危害环境．工业上常采用化学方法控制污染． 1如图是1molCH4完全燃烧生成气态水的能量变化和1molSg燃烧的能量变化． ①CH4完全燃烧的活化能是kJ/mol ②在催化剂作用下CH4可以还原SO2生成单质SgH2Og和CO2写出该反应的热化学方程式 2为减少SO2排放将含SO2的烟气通过洗涤剂X充分吸收后再向吸收后的溶液中加入稀硫酸既可以回收SO2同时又可得到化肥．X可以是填序号． a．CaOH2b．K2CO3c．Na2SO3d．NH3▪H2O 3对NO2+SO2⇌SO3+NO△H＜0反应进行探究在固定体积的密闭容器中使用某种催化剂改变原料气配比进行多组实验各次实验的温度可能相同也可能不同测定NO2的平衡转化率．实验结果如图所示 ①能够加快该化学反应速率的外界条件是 a．降低温度b．增大压强c．升高温度d．减小压强 ②如果要将图中C点的平衡状态改变为B点的平衡状态应采取的措施是 ③若A点对应实验中SO2g的起始浓度为comol▪L﹣1经过tmin达到平衡状态该时段化学反应速率NO2＝mol▪L﹣1▪min﹣1 ④图中CD两点对应的实验温度分别为Tc和TD计算判断TcTD填＞＝或＜．
下列过程没有明显现象的是
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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:在锆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. OnedaywhenIwaspassingbyTargetIfeltsoattractive.Therewastheskirtwaitedforme. Itwasspecificdesignednottocoveranythingandlookedlikesomethingoneofthosemagicschoolgirlswouldwear.Iwentintothedressingroomtotryitin.SuchsurewasIthatthisskirtwouldchangemeintothatIwishedtobe.QuicklyIslidmyjeansoffandputon.Ilookedinthemirror.ThereIwas﹣auglygirlwiththebeautifulskirtandmyclumsysneakers.Theskirtdoesn'tchangeme.Thoughitfitwellandmightmakemegoodbutitwasnotme.Itookthethingoffandslidbackintomyjeans.Isawmyself.
一圆弧形的槽槽底放在水平地面上槽的两侧与光滑斜坡aa′bb′相切相切处ab位于同一水平面内槽与斜坡在竖直平面内的截面如图所示．一 小物块从斜坡aa′上距水平面ab的高度为2h处沿斜坡自由滑下并自a处进入槽内到达b后沿斜坡bb′向上滑行已知到达的最高处距水平面ab的高度为h接着小物块沿斜坡bb'滑下并从b处进入槽内反向运动若不考虑空气阻力则
MnSO4•H2O是一种易溶于水的微红色斜方晶体某同学设计下列装置制备硫酸锰下列说法错误的是
如图所示边长为L的正方形线圈abcd其匝数为n总电阻为r外电路的电阻为Rab的中点和cd的中点的连线OO′恰好位于匀强磁场的边界线上磁场的磁感应强度为B．若线圈从图示位置开始以角速度ω绕OO′轴匀速转动则以下判断中正确的是
下列实验中对应的现象以及结论都正确且两者具有因果关系的是
WangNapseudonym21atJilinUniversityhasbeenexperiencingsocialawkwardnesssinceherjuniormiddleschoolyears.Backthenshefeltself﹣consciousaboutgoingtotherestroomalone.Sheevenlimitedtheamountofwatershedrankjustsoshedidn'thavetogothereoften.IfearedthatotherstudentswouldthinkthatIdidn'tgetalongwellwithothersifIwasseenaloneshesaid. Wangisnottheonlysuffererofwhat'scalledsocialanxiety.ChinaYouthDailyrecentlydidasurveyamongl544people.Nearlyhalf44.6percentoftheparticipantsadmittedthattheywereafraidofbeingthecenterofattention.Upto66.7percentofthemsaidtheyaremorelikelytobeanxiousduringface﹣to﹣facecommunicationsthaninonlineconversationsButthesefeelingsarenotnecessarilysomethingtoworryabout.Thereis'socialanxiety'andthereis'socialanxietydisorder'or'socialphobia'.TheyaretwocompletelydifferentthingssaidLiSongweialectureratthepsychologicalcounselingcenterofTsinghuaUniversityAccordingtoThomasRodebaughapsychologyprofessoratWashingtonUniversityinStLouisUSalmosteveryonesuffersfromatleastalittlesocialanxiety.Forexamplewemaygetthejittersbeforespeakinginpublicorhaveabadnight'ssleepifthereisgoingtobeanimportantinterviewthenextday. We'dbeworriedaboutsomeonewhoneverexperiencesanysocialanxietyRodebaughtoldtheAtlantic. Butwhendoessocialanxietydevelopintoadisorder?ThatisuptoadoctortodiagnosesaysLi.Therearetwosimplequestionsyoucanaskyourselfifyou'reconcemed﹣';Howmuchdoestheanxietyaffectmylife?andIsitacceptable?Iftheconditionbecomessoproblematicthatyourefusetogooutatallandcannotliveanormallifeyouneedtoseekhelp.Butforcommonsocialanxietypeopleallhavetheirdifferentcopingstrategies.ThemorecopingstrategiesonehasthelesslikelytheanxietyisgoingtodevelopintoadisorderLiSongweisaidTinapseudonym20atZhejiangA&FUniversityfacesanxietyeverytimeshehastospeakupinclasssothestrategysheemploysisreasoningplusrewards.Forexampleshetellsherselfthatthereisnosuchthingasrightorwrongwhenspeakingpublicly;thereareonlypeoplewhoagreewithyouornot.Andifsheconquersherfearshebuysnewshoesorgoestoseeamovieafterclass. ThefirsttimeIpushedmyselftospeakupinclasswasabreakthroughshesaid.ThingsseemedaloteasierafterItookthatfirststep. 1TheexampleofWangNaismentionedtoshow. A.thesymptomsofsocialanxiety B.shedidn'tknowhowtogetalongwithotherstudents C.shewasunwillingtogototherestroomalone D.shedidn'tlikedrinkingwater 2AccordingtoLiwhichofthefollowingistrue? A.Itisuptoyoutojudgewhethersocialanxietyhasdevelopedintoadisorderornot. B.Theanxietyismorelikelytobecomeadisorderifyouhavemorecopingstrategies C.Youwillhaveabadnight'ssleepifthereisgoingtobeanimportantinterviewthenextday D.Don'tworryaboutitifyouareafraidofbeingthecenterofattention 3WhatcanwelearnedfromTina? A.Everytimeshespeaksupinclassshewillbuynewshoesorgoestoseeamovieafterclass. B.Shewillgivehersomerewardsifsheovercomesthefearofspeakinginpublic C.Whatshesaysinpublicalwayswrong D.Shefailedtopushedherselftospeakupinclassatthefirsttime 4Theunderlinedwordjitterscanbestbereplacedby. A.comfortable B.nervous C.excited D.upset
下列说法正确的是
有机物M是有机合成的重要中间体制备M的一种合成路线如图部分反应条件和试剂略去 已知①A的密度是相同条件下H2密度的38倍其分子的核磁共振氢谱中有3组峰 ②﹣NH2容易氧化 ③ 请回答下列问题 1B的化学名称为．A中官能团的电子式为． 2C→D的反应类型是I的结构简式为． 3F→G的化学方程式为． 4M不可能发生的反应为填选项字母． a．加成反应b．氧化反应c．取代反应d．消去反应 5请写出任意两种满足下列条件的E的同分异构体有． ①能与FeCl3溶液发生显色反应 ②能与NaHCO3反应 ③含有﹣NH2 6参照上述合成路线以为原料无机试剂仕选设计制备的合成路线．
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溴丙胺太林片是一种用于治疗胃肠痉挛性疼痛的药物其合成路线如图 回答下列问题 1A→B的反应类型反应F→G的反应类型反应 2C含有的官能团名称 3C→D的化学反应方程式 4E→F的化学反应方程式 5I的结构简式是． 6假设有机物J苯环上的氢化学环境相同则J核磁共振氢谱有组峰 7写出1种与NaOH物质的量比13发生反应的E的同分异构体的结构简式 8将下列合成路线补充完整 该路线中化合物X为化合物Y为 试剂与条件a为
WXY和Z为原子序数依次增大的四种短周期主族元素．W的简单气态氢化物的水溶液可使酚酞溶液变红X是地壳中含量最大的元素Y的族序数等于其周期数Z的原子半径是同周期主族元素中最小的．下列说法正确的是
WaltDisneyhasfinallyconfirmedtheopeningdateforthenewDisneyresortinShanghai. Theproject'sdeveloperhasannouncedthatthelong﹣anticipatedthemeparkwillopenitsgatestotounstsonJune16th. Theresort'sgeneralmanagerPhilippeGassaysathree﹣daygrandopeningcelebrationisinpreparation. It'saboutbeingauthenticallyDisneyandalsodistinctlyChinese.SoofcoursethecelebrationwillalsoreflectthatthemethathasbeenourthemesincethebeginningofourconstructionwhichiscelebratingboththeblendofwhatDisneycanofferwiththecultureofChina. ShanghaiDisneyresortismadeupofsixthemedlandsincludingAdventureIsle水岛GardensofImaginationMickeyAvenueTomorrowlandTreasureCove小海湾andFantasyland. ItwillhavefeaturesandattractionsuniqueamongDisney'sworldwidepropertiesincludingonesbasedonMarvelcomicsfranchisesandStarWars.GasalsoindicatestherewillbeothersdistinctlyinspiredbyChineseculture WetalkedaboutDisney'srespectofthebeautyandcultureofChinaandblendthatwithDisneystorytellingthecreativitythatDisneycanbring.Thegardenof12friendsthatcelebratethe12zodiacsignsandassociatethoseveryimportantstoriesabouttheChinesezodiacwithallDisneycharactersandmakethemcometogetherinaveryrespectfulandIthinkbeautifulway. 1Whichofthefollowingisthebesttitleofthepassage? A.Fantasyland B.Tomorrowland C.MickeyAvenue D.ShanghaiDisney 2Accordingtothepassagewhichofthefollowingstatememntsistrue? A.ThethemeparkwillopenitsgatestotouristsinJune B.Theresortismadeupoffivethemedlands C.TheresortisthesameasotherDisney D.It'sonlyaboutbeingauthenticallyDisney 3InPara6blendmaymean A.combine C.respect B.like D.inspire 4Youcanreadthepassagein A.anovelbook B.anewspaper C.adiary D.areferencebook
氮及其化合物在生产生活中应用广泛研究它们的性质具有重要意义．某学习小组选择如图装置夹持装置已略去对NO与铜粉在加热条件下的反应进行探究． 查阅资料NO+FeSO4＝FeNOSO4深棕色 实验时部分实验现象记录如下 1NO的制备 ①A中铜与稀硝酸反应的离子方程式是 ②A中使用恒压滴液漏斗与普通分液漏斗相比其显著的优点是 2NO与铜的反应 ①用纯净的NO与铜反应上图中装置的连接顺序应为a→→j按气流方向用小写字母表示．其中E的作用是 ②实验时应先打开A中滴液漏斗的活塞当D中溶液变成深棕色时再填操作．按以上顺序进行操作的目的是 ③测得F中收集到的气体对H2的相对密度为14该气体是则B中发生反应的化学方程式是
天然气是一种用途广泛的清洁能源 1工业上可用焦炉煤气主要成分为COCO2和H2制备CH4 已知COg+3H2g＝CH4g+H2Og△H＝﹣206kJ/mol COg+H2Og＝H2g+CO2g△H＝﹣41kJ/mol 则CO2g+4H2g＝CH4g+2H2Og△H＝ 2已知CH4g+CO2g⇌2COg+2H2g在10L恒容密闭容器中通入1molCH4与1molCO2发生上述反应测得CH4的平衡转化率与温度和压强的关系如图1所示． ①有利于提高CH4转化率的措施是 A．使用催化剂B．升高温度C．增大CO2浓度D．通入氩气 ②压强P1P2填“＞”＜”或“＝”下空同P2条件下y点的v正v逆 ③在1100℃P2条件下反应经过10min到达x点的平衡状态．0﹣10minvH2＝反应平衡常数K＝保留1位小数 3用天然气制取C2H4的反应原理如下 主反应2CH4g⇌C2H4g+2H2g△H＞0 副反应2CH4g⇌C2H6g+H2g△H＞0 在常温下向体积为1L的恒容密闭容器中充入1molCH4测得混合气体中CH4与C2H6的体积分数随温度变化关系如图2所示 ①制取C2H4的适宜温度是 ②200℃时测出乙烷的量比乙烯多的主要原因是
以芳香族化合物A为原料合成H的流程如图 1A的化学名称为 2②的反应类型为 3B的结构简式为 4反应③所需试剂条件分别为． 5⑤的化学方程式为 6写出与G互为同分异构体且能发生银镜反应的芳香族化合物的结构简式核磁共振氢谱为四组峰峰面积比为2211 7写出以2﹣溴丁烷为原料制备乙酸乙酯的合成路线无机试剂任选
为了缓解温室效应科学家提出了多种回收和利用CO2的方案． 方案I利用FeO吸收CO2获得H2． i.6FeOs+CO2g﹣2Fe3O4s+Cs△H1＝﹣76.0kJ•mol﹣1 ii．Cs+2H20g＝CO2g+2H2g△H2＝+113.4kJ•mol﹣1 1Os+H2Og＝Fe3O34s+H2g△H3＝． 2在反应i中每放出38.0kJ热量有gFeO被氧化． 方案Ⅱ利用CO2制备CH4 300℃时向2L恒容密闭容器中充入2molCO2和8molH2发生反应CO2g+4H2g⇌CH4g+2H2Og△H4cCH4与反应时间的关系如图所示． 3①从反应开始到恰好达到平衡时H2的平均反应速率vH2＝ ②300℃时反应的平衡常数K＝． ③保持温度不变向平衡后的容器中再充入2molCO2和8molH2重新达到平衡时cCH4填字母． a．等于0.8mol•L﹣1c．等于1.6mol•L﹣1 b.0.8mol•L﹣1＜cCH4＜1.6mol•L﹣1d．大于1.6mol•L﹣1 4300℃时如果该容器中有16molCO22.0molH25.6molCH44.0molH2Og则v正v逆填“＞”“＜”或“＝” 5已知200℃时该反应的平衡常数K＝61.8L2mol﹣2．则△H40填填“＞”“＜”或“＝” 方案I用碱溶液吸收CO2．利用100mL3mol•L﹣1NaOH溶液吸收4.48LCO2标准状况得到吸收液． 6该吸收液中离子浓度的大小排序为．．将该吸收液蒸干灼烧至恒重所得固体的成分是填化学式．
下列实验装置试剂选择和操作均正确的是
某种原子核X经过a衰变后变为核Y再经过β衰变后变为核Z下列关系中正确的是
如图为实验室筛选带电粒子的装置示意图左端加速电极MN间的电压为U1中间速度选择器中存在相互垂直的匀强电场和匀强磁场．匀强磁场的场强B1＝1.0T两板电压U2＝1.0×102V两板间的距离D＝2m．选择器右端是一个半径R＝20cm的圆筒可以围绕竖直中心轴顺时针转动筒壁的一个水平圆周上均匀分布着8个小孔O1至O8圆筒内部有竖直向下的匀强磁场B2一电荷量为q＝1.60×10﹣19C质量为m＝3.2×10﹣25kg的带电的粒子从静止开始经过加速电场后匀速穿过速度选择器．圆筒不转时粒子恰好从小孔08射入从小孔03射出若粒子碰到圆筒就被圆筒吸收．求 1加速器两端的电压U1的大小 2圆简内匀强磁场B2的大少并判断粒子带电还是负电 3要使粒子从一个小孔射入圆筒后能从正对面的小孔射出如从O1进从O5出则圆筒匀速转动的角速度多大
A43﹣year﹣oldwomanwasfound1inanelevatorinChina.Shehadbeentappedintheelevator2aboutamonth. CNNsaysamaintenancecrew维修队3abrokenelevatorintheChinesecityofXi'anonJanuary30.Theelevatorhadstopped4he10thand11thfloors.Workersshoutedtosee5amyonewasinsideanddidnothearananswer.Theyleftthebuildingwiththepower6. Workersfoundthewoman'sbodyonMarch1aftertheyretumedfomtheLumarNewYearholiday.Thewoman7livedinthebuilding.couldhavebeenintheelevatorfor8to30days.Thewoman'sneighborssaidthatthewomanlived9. Localpolicearstedtwo10intheirinvestgationTheysaidtheywereinvestgatingthecompanies11fortheelevatormaintenance. Chinesewebuserspostedangryresponsesonsocialmedia.TheyciticizedrelationshipsinmodemChinesesociety.OneuserofWeibo12socialmediasite13toTwittersaid: Ithoughtsuchthingswouldonly14jnthewild.Butactuallythecrowdedcitiesare15butjustaforestofsteelweare16bysomanypeopleandhavesomany'goodfiends'inonlinechatgroupsbutthereare17thatreallyhaveanythingtodowithyou. Chinesemedia18negligence忽略inChina'selevatormaintenanceindustry.Mediaalso criticizedpropertymanagementcompanies. Chinahashadproblemswithsimilaraccidentsinthepast.LastJulyawomandiedaftershefellthroughflooringinaChinesedepartmentstore.19itarousedpeople'sdeepthinkingaboutthe20amongpeopleaswellasthesafetyproblemshiddeninthemodemfacilities. 1A.died B.dead C.dies D.deadly 2A.to B.during C.in D.for 3A.inspected B.looked C.showed D.saw 4A.in B.on C.between D.from 5A.if B.why C.so D.unless 6A.turnedon B.turneddown C.turnedup D.turnedoff 7A.that B.who C.when D.which 8A.about B.up C.nearly D.almost 9A.alone B.happily C.lonely D.sadly 10A.witmesses B.people C.patients D.suspects 11A.embarrassed B.ashamed C.sorry D.responsible 12A.a B.an C.the D.one 13A.similar B.familiar C.same D.different 14A.happens B.takeplace C.cameabout D.occurred 15A.nothing B.anything C.something D.everything 16A.followed B.watched C.surounded D.caught 17A.ltle B.alite C.few D.afew 18A.allowed B.cnticized C.encouraged D.judged 19A.Therefore B.However C.Moreover D.Eventually 20A.connection B.attitude C.emotion D.relationships
粉煤灰是火电厂烟气中排出的污染物之一对某火电厂粉煤灰处理的流程如图 下列叙述错误的是
两个相同的条形磁铁水平放在水平木板AB上磁铁的NS极如图 所示．开始时木板及磁铁都静止不动．下列说法正确的是
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