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镁将成为21世纪重要的轻型环保材料，我国含有非常丰富的镁资源． （1）金属镁是一种较活泼金属，在二氧化碳气体中也能燃烧．由此你对燃烧有什么新的认识 ． （2）镁铝合金广泛用于火箭、导弹和飞机...
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21世纪天军将成为航天大国军队建设的重要目标
镁将成为21世纪重要的轻型环保材料.海水的综合利用可以制备金属镁.其流程如图所示.其中A.B.C.D
以深海采掘海水和海洋空间利用为标志的海洋技术将成为21世纪人类向内拓展的一个计划海洋是一个大宝库它为
水利资源
矿产资料
化学资源
生物资源
镁将成为21世纪重要的轻型环保材料我国含有非常丰富的镁资源1金属镁是一种活泼金属在二氧化碳气体中能燃
镁将成为21世纪重要的轻型环保材料我国含有非常丰富的镁资源． 占地球表面积70%的海洋是天然的镁
镁是生产铝合金必需的添加材料镁合金被公认为21世纪绿色环保新型材料可广泛运用于航空航天汽车等10多个
溶液的温度
镁条的表面积
Cl
－
的浓度
H.
＋
的浓度
根据本课的预测会计计算机软件开发中医保健咨询服务等将成为21世纪的主导型职业
以深海采掘海水和海洋空间利用为标志的海洋技术将成为21世纪人类向内拓展的一个计划海洋是一个大宝库它为
水利资源
矿产资源
化学资源
生物资源
镁将成为21世纪重要的轻型环保材料我国含有非常丰富的镁资源.1金属镁是一种较活泼金属在二氧化碳气体中
用一句话概括下面这段话的主要意思不超过28字近几年来关于中国文化主要是中国传统文化或者是以中国文化为
什么将成为21世纪引发新科技革命的重要推动力量
钛Ti和钛合金被认为是21世纪的重要金属材料钛可通过如下反应制得TiCl4+2Mg====Ti+2M
21世纪是环保世纪
我国致力于在成为世界科技强国
21世纪中后叶
21世纪中叶
22世纪中叶
22世纪初
将成为21世纪先导的是
生物技术
信息技术
新材料技术
新能源技术
21世纪新的绿色革命将成为一场基因革命
关于中国传统文化将成为21世纪的主导性文化的观点十分流行西方一些学者也持有此类观点对此我则持怀疑态
无所谓
不可能
怀疑
肯定会
镁将成为21世纪重要的轻型环保材料我国含有非常丰富的镁资源.1金属镁是一种活泼金属在二氧化碳气体中能
关于中国传统文化将成为21世纪的主导性文化的观点十分流行西方一些学者也持有此类观点对此我则持怀疑态度
无所谓
不可能
怀疑
肯定会
近几年来关于中国文化主要是中国传统文化或者是以中国文化为基础的东方文化将成为21世纪主导性文化及21
我对中国传统文化和东方文化将成为21世纪主导文化的观点持怀疑态度
中国传统文化将成为21世纪主导文化的提法，值得怀疑
中国的东方文化将主导21世纪文化，我不相信
21世纪文化将被中国东方文化主导，我持怀疑态度
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用图1所示的实验装置研究小车速度随时间变化的规律． 主要实步骤如下 a．安装好实验器材接通电源后让拖着纸带的小车沿长木板运动重复几次． b．选出一条点迹清晰的纸带接一个合适的点当作计时起点Ot＝0然后每隔相同的时间间隔T选取一个计数点如图2中ABCDEF……所示． c．通过测量计算可以得到在打ABCDE……点时小车的速度分别记作v1v2v3v4v5…… d．以速度v为纵轴时间t为横轴建立直角坐标系在坐标纸上描点如图3所示． 结合上述实验步骤请你完成下列任务 1在下列仪器和器材中还需要使用的有和填选项前的字母 A．电压合适的50Hz交流电源 B．电压可调的直流电源 C．刻度尺 D．秒表 E．天平含砝码 2在图3中已标出计数点ABDE对应的坐标点请在该图中标出计数点C对应的坐标点并画出v﹣t图象． 3观察v﹣t图象可以判断小车做匀变速直线运动其依据是．v﹣t图象斜率的物理意义是． 4描绘v﹣t图象前还不知道小车是否做匀变速直线运动．用平均速度表示各计数点的瞬时速度从理论上讲对△t的要求是选填“越小越好”或“与大小无关”从实验的角度看选取的△x大小与速度测量的误差选填“有关”或“无关”． 5早在16世纪末伽利略就猜想落体运动的速度应该是均匀变化的．当时只能靠滴水计时为此他设计了如图4所示的“斜面实验”反复做了上百次验证了他的猜想．请你结合匀变速直线运动的知识分析说明如何利用伽利略“斜面实验”检验小球的速度是随时间均匀变化的．
如图为一列简谐横波在t＝0时的波形图波源位于坐标原点已知当t＝0.5s时x＝4cm处的质点第一次位于波谷下列说法正确的是
如图所示材料相同的物体mlm2由轻绳连接在恒定拉力F的作用下沿斜面向上加速运动．轻绳拉力的大小
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JoinAAAStounlockaccesstothelatestsciencenewsandresearch﹣andtosupportthepeoplemakingithappen. WhenyoujoinAAASthepublisherofScienceyou'renotjustgettingthelatestnewsandresearchfromacrosstheglobe.Youalsobecomepartoftheworld'slargestgeneralscientificsociety﹣arealcommunityofscientistsandsciencesupporters. Yourmembershiphelpsusmaintainsupportforscienceeducationadvocateforresponsiblepublicpoliciesandadvancescienceforthebenefitofa11. Allmembershipsinclude50issuesofSciencewithyourchoiceofprintordistaldelivery.You'llalsogetunlimitedaccesstoallouronlinearticlesatsciencemag.Org﹣fromanydeviceandanywhere﹣andlotsofotherexclusiveAAASbenefits. Becomeamembertodayforaslittleas﹩50andwe'11a1sosendyoualimited﹣editionT﹣shirt﹣butonlywhilesupplieslast.Hurryandjoinnow! PleasechooseyourAAASmembershipandSciencedeliverytype. AllmembershipsincludeweeklyissuesofScienceunlimitedaccesstoScienceNewsonlineandotherexclusiveAAASbenefits. 1WhatextrabenefitwillyougetifyoubecomeamemberofAAASrightnow? A.﹩50asareward. B.50issuesofScience. C.Alimited﹣editionT﹣shirt. D.Unlimitedaccesstoonlinearticles. 2Whichmembershiptypechargesthemostfordigitaldelivery? A.Regular. B.PostDoc. C.Retired. D.ScienceAdvocate. 3What'sthepurposeofthetext? A.Tointroduceamagazine. B.ToinvitepeopletojoinAAAS. C.Toadvertiseawebsite. D.ToshowAAASmemberbenefits.
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假定你是学校英语报的兼职编辑李华.最近该报开设了YourFeelings专栏column.请用英语写一篇短文介绍开设该专栏的目的交流情感专栏内容有关心理健康的文章及解答心理问题并号召同学们投稿. 注意 1.词数100左右 2.可适当增加细节以使行文连贯.
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在空间中存在垂直于纸面向里的匀强磁场其竖直边界ABCD的宽度为d在边界AB左侧是竖直向下场强为E的匀强电场现有质量为m带电量为+q的粒子不计重力从P点以大小为v0的水平初速度射入电场随后与边界AB成45°射入磁场若粒子能垂直CD边界飞出磁场试求 1匀强磁场的磁感应强度B 2从进入电场到穿出磁场的总时间．
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Whenmyfathermarriedmymotherin1943hegavemymothera1937crowncoinandtoldhertokeepitinthebackofherpurseandnotspendit.Thiswouldmeanthatshealwaysfeltthatshewasprotectedandwouldalwayshavemoneyifshereallyneededit. WhenIwasmarriedin1970myhusbandwhohadheardthisstoryobtaineda1937crownformeandIhavealwayskeptitinmywalletandIhavealwayshadenoughformyneeds. Afriendrecentlyfellonhardtimespartlythroughexternal外部的circumstancesandpartlythroughpoorplanning.FriendsandIhaveloanedhermoneypaidherbillsevengivenherfoodandtriedtoteachherbudgettechniquesbutnoneofthemhasbeenasolution.Shehasjustslippeddeeperanddeeperintofinancialtroubleanddepression. Lastweekshelookedpaleandunwellverydepressedandhopeless.Ithenthoughtabouthowthecrownareminderofanother'scareandlovehadprotectedmesoIwenttothebankfora﹩100dollarbill.Itoldmyfriendthestoryandaskedhertokeepthe﹩100inthebackofherwallet.Itturnedoutthatshedidn'thaveawalletsosheputthemoneyinalittlepencilcasewhereshekepthercoins.Sheimmediatelyfeltbetter.Ifeelrichandthankyouforbeingagoodfriendshesaidandwewerebothabitteary. Thereasonforpassingthisonisnottopraiseanygenerosityonmypartbuttoshowthepowerofrandomactsofkindness.IwenthomeandrememberedalittlewalletIhadthatI'dneverusedandthoughtI'llgivethattomyfriend.Iopeneditandinsidefound﹩100.Theuniverseisveryjustandifyourheartisopentherewardalwayscomes. 1Whatdidthe1937crowncoinfromtheauthor'sfathermeantohermother? A.Hisconcernforher. B.Hispityandprotectionforher. C.Hiscareandloveforher. D.Hisprideandrespectforher. 2Wheredidtheauthor'sfriendkeepthe﹩100dollar﹣bill? A.Inthebackofherwallet. B.Inalittlepencilcase. C.Inthepocketofherraincoat. D.Inthelayerofhersuitcase. 3WhatcanheinferredfromthelastParagraph? A.Theauthorbecamerichallofasudden. B.Theauthor'sfriendwouldreceiveawalletasagift. C.Theauthor'sfriendwasnottouchedbyherstory. D.Theauthorfeltuncomfortablewhenreceivingthebill. 4Whatcanbethebesttitleforthetext? A.Ahardlife B.Thehelptoafriend C.Acrowncoin D.Agiftfrommyfather
质谱仪是一种测量带电粒子质量和分析同位素的重要工具它的构造原理如图离子源A产生电荷量相同而质量不同的离子束初速度可视为零从狭缝S1进入电场经电压为U的加速电场加速后再通过狭缝S2从小孔垂直MN射入圆形匀强磁场．该匀强磁场的磁感应强度为B方向垂直于纸面向外半径为R磁场边界与直线MN相切E为切点．离子离开磁场最终到达感光底片MN上设离子电荷量为q到达感光底片上的点与E点的距离为x不计重力可以判断
假如你是李华五月份去美国参加国际文化周你的美国笔友Tom来信询问你赴美相关事宜.请你写一封回信内容包括 1.活动时间地点 2.活动的内容 3.其他个人安排. 注意 1.词数100左右. 2.可适当增加细节以使行文连贯. 参考词汇InternationalCultureweek国际文化周
中国科学家发现了量子反常霍尔效应杨振宁称这一发现是诺贝尔奖级的成果．如图所示厚度为h宽度为d的金属导体当磁场方向与电流方向垂直时在导体上下表面会产生电势差这种现象称为霍尔效应．下列说法正确的是
质量均为m＝lkg的甲乙两个物体同时从同地沿同一方向做直线运动二者的动能随位移的变化图象如图所示．下列说法正确的是
如图所示电源电动势为E内阴为r．电路中的R1为光敏电阻其阻值光照强度增大而减小R2为定值电阻．当开关S闭合时下列说法正确的是
InastudyrecentlypublishedinthejournalNeuronresearchersfoundthatsupermemorizersdonthaveunusuallylargebrainregionsthatallowthemtorememberalotofinformation.1Hereareafewoftheirfavoritetricksthatcanhelpyoutorememberthingsinyoureverydaylife. ToRememberNewwords TechniqueChangeroutine Inastudyagroupofstudentsstudiedalistofwordsintwoseparatesessions.Somestudiedinamessyroomandsomeinaneatspace.Onegroupofstudentsspentbothsessionsinthesameroomwhiletheothersplitthesessionsbetweenthetwoenvironments.Duringatestthestudentswhostudiedinmultipleplacesrememberedmuchmore.2Thatincludesthetimeofdaythemusicinthebackgroundwhetheryousitorstandetc. ToRememberYourPIN TechniqueCountitout Youcoulduseyourbirthdayoryourphonenumberbutidentitythieveshaveawayoffiguringthosenumbersout.3Writeafour—wordsentencethencountthenumberoflettersineachword.ForinstanceThisismyPIN＝4223. ToRememberFaces TechniqueFocusonnoses Whilesomesupermemorizersspecializeinassociatingnameswithfacesthememory—palacetechniquedoesn'tworkaswelliftheimageofthefaceischangedinanyway.Ratherthanfocusingoneyesasmostpeopledofocusonthecentreortotheleftofapersonsnose.4 ToRememberFacts&figures Technique5 Tolearnandrememberstatisticsreviewingthematerialrepeatedlyoveralongertimeisfarmoreeffectivethanrepeatingitinashorterone.Ifyourexamisinaweekstudytodayandthenagaininadayortwo.Ifitsamonthawaystudytodayandthenwaitaweekbeforeyoursecondsession. A.Valueexams. B.Giveyourselftime. C.Thisallowsyoutotakeintheirwholeface. D.Theirbrainstructuresareinfactthesameastherestofours. E.InsteadtrythistipfromDominicaneight—timeWorldMemoryChampion. F.Thetheoryisthatyourbrainlinksthewordstotheenvironmentaroundyou. G.Studiesshowedthatvaryingotheraspectsofyourenvironmentcanalsohelp.
QianZhongshuwasaChinesescholarandwriterknownforhiswitanderudition博学.DespitefailinginmathematicsQian1successenteredtheDepartmentofForeignLanguagesunderTsinghuaUniversityin1929becauseofhis2excellenceperformanceinChineseandEnglishlanguages.InTsinghuahemethiswifeYangJiangwhowastobecomeasuccessfulplaywrightandtranslatorand3marryherin1935.InthesameyearQianreceivedgovernmentsponsorship4promotehisstudiesabroad.TogetherwithhiswifeQianheadedfortheUniversityofOxfordinBritain.After5spendtwoyearsatExeterCollegehereceivedabachelorofliterature.HestudiedforonemoreyearintheUniversityofParisinFranceandhedidn'treturntoChina61938. QianlivedinShanghaifrom1941to19457wasthenunderJapaneseoccupation.Atthattimehedevoted8hetowritingandmanyofhisworkswerewrittenorpublishedthen.Acollectionofshort9essayWritingintheMarginsofLifewaspublishedin1941.HismostcelebratedworkFortressBesiegedappearedin1947.OntheArtofPoetrywritten10classicalChinesewasissuedin1948.
下列说法中正确的是
下列说法中正确的是
一列横波沿x轴正方向传播在t＝0时刻的波形曲线如图所示．已知这列波的质点P从t＝0时刻起第一次达到波峰的时间为0.6s质点PQ的坐标分别为10和70则有
Chinesehigh—speedrailwayareavery1comfortwaytotravel.Theyarecleanquietandefficient.Chinahasledotherdevelopingcountriesandevensomedevelopedonesinthisfieldsincethefirsthigh—speedtrain2comeintousein2008. Thestationsare3mainbuiltoutsidethetowncentrebutlocaltransporthasbeenlengthened4connectthehigh—speednetwork.Thefacilitiesonthetrainarenewandthestaffarewelltrained.Eventhesecondclass5chairprovideplentyofspace.Thepassengersaresowide6youcanmovewithoutdisturbinganyone.Youcanuseyourmobilephoneaccess7Internetorworkonyourlaptop.Thereisalsoarestaurantcarthoughthekindsoffood8belimited.Thetoiletsarelargecleananduser—friendlytoo.Thetrainalmostdoesntrock.Evenwhenthetrainbrakesyoucanhardlyfeelitshake. What'smorewithafastercheck—inthehigh—speedtrainsarealso9littleaffectedbyweatherthanplanes.Seldomare10delayedorcancelledforweathercondition.Thereforetheyhavebecomethefirstchoiceformanypassengers.
Knowingwhattodoatcheckoutandproperlypreparingforitcanturnapotentiallyheatedsituationintoaquickthankyouaddgoodbye.Belowwemadealistoffivethingsyoushouldrememberathotelcheckout. Don'tbelatetocheck Hotelsmayaddanextremelyhighpriceforbeingjustahalfhourlate.Ifyouknowyouwon'tmakethecutofftimeitneverhurtstocallaheadandtrytonegotiateawayapotentialcharge. Don'tforgettodoublecheektheroomandsafe Makesureyoudon'tleavethingsbehind.Ifyouhaveanearlyflightorcheckouttimepackupasmuchasyoucanthenightbeforesothatlast—minuterushisn'ttooannoying.Alsobesuretotakeoutanythingintheroomsafe. Don'tforgettotipthehousekeepers It'salwayspolitetoleavesomemoneyforthepeoplekeepingyourroomclean. Don'tignorethedetailedbill Youmaybeinarushbutgivethedetailedhillacarefullooktoseeifthehotelchargeisdifferentfromtherateyouinitiallybooked. Don'tgetangry Shootingattheassistantmanagerstandingbehindthefrontdeskprobablywon'thelp. Whendealingwithanunexpecteditemonthebill.Thinkabouthowdifficultitcanbetodealwithannoyedcustomers.Keepcalmandthingsmaybesolvedbetterandsooner. 1Thehotelwillchargeyoumoremoneyifyou. A.checkbeforecutofftime B.donotcallthehotelahead C.arelateincheckingout D.negotiatewiththeclerks 2Whichofthefollowingdoestheauthorsuggestdoing? A.Leavingsomethingbehind. B.Beingsuretokeeptheroomclean. C.Doingthepack—upasearlyaspossible. D.Tippingthehousekeeperstoshitrespect. 3Whatisthepurposeofthelastparagraphofthepassage? A.Tosuggestawaytosolveproblemsproperly B.Toprovidemoreinformationaboutthehotel. C.Toshowtheuneasinessofassistantmanagers D.Toprotectcustomersfromunnecessarydangers. 4Inwhichsectionofthemagazinecanyouprobablyfindsuchapassage? A.Fitness. B.Nature. C.Lifestyle. D.Travel.
探究力对物体做的功与物体获得的速度的关系实验装置如图俯视图关于实验主要过程说法正确的是
Itisgenerallyacknowledgedthatyoungpeoplefrompoorersocio—economicbackgroundstendtodolesswellintheeducationsystem.InanattempttohelpthechildrenofpoorfamiliesanationwideprogramcalledHeadstartwasstartedintheUSin1965.Alotofmoneywaspouredintoit.Ittookchildrenintopre—schoolinstitutionsattheageofthreeandwassupposedtohelpthemsucceedinschool.Buttheresultshavebeendisappointingbecausetheprogrambegantoolate.Manychildrenwhoentereditatthreewerealreadybehindtheirpeersinlanguageandintelligenceandtheparentswerenotinvolvedintheprocess.AttheendofeachdayHeadstartchildrenreturnedtothesamedisadvantagedhomeenvironment. ToimprovetheresultsanotherprogramwasstartedinMissourithatconcentratedonparentsasthechild'sfirstteachers.Thisprogramwasbasedonresearchshowingthatworkingwiththefamilyisthemosteffectivewayofhelpingchildrengetthebestpossiblestartinlife.Thefour—yearstudyincluded380familieswhowereabouttohavetheirfirstchildandrepresenteddifferentsocial—economicstatusageandfamilystructure.Theprograminvolvedtrainededucatorsvisitingandworkingwiththeparentorparentsandthechild.Theprogramalsogavetheparentssomeguidanceandusefulskillsonchilddevelopment. AtthreethechildreninvolvedintheMissouriprogramwereevaluatedwiththechildrenselectedfromthesamesocio—economicbackgroundandfamilysituations.Theresultswereobvious.Thechildrenintheprogramweremoreadvancedinlanguagedevelopmentproblemsolvingandotherintellectualskillsthantheirpeers.Theyperformedequallywellregardlessofsocio—economicbackgroundsorfamilystructure.Theonefactorthatwasfoundtoaffectthechild'sdevelopmentwasthepoorqualityofparent—childinteraction.Thatinteractionwasnotnecessarilybadinpoorerfamilies. TheMissouriprogramcomparesquitedistinctlywiththeHeadstartprogram.Withoutasimilarfocusonparenteducationandonthevitalimportanceofthefirstthreeyearssomeevidenceindicatesthatitwillnotbeenoughtoovercomeeducationalunfairness. 1WhatcausedthefailureoftheHeadstartprogram? A.Thelargenumberofpoorfamilies. B.Thedisapprovalfromchildren. C.Thelatestartoftheprogram. D.Thelongperiodoftime. 2WhatdoweknowabouttheMissouriprogram? A.Itfocusedonthechildren'sfirstschoolteachers. B.Ithelpedthechildrenreturntothesamehome. C.Itmadethechildrenimprovedinmanyaspects. D.Itgavetheparentsadviceontheirdevelopment. 3Accordingtothepassagewhatislikelytoinfluencechildren'sperformance? A.Thenumberoffamilymembers. B.Theparent—childcommunication. C.Theintelligenceoftheirparents. D.Theteacher—studentrelationship. 4Howdoestheauthordevelopthepassage? A.Bylistingfigures. B.Bymakingcomparisons. C.Bygivingexamples. D.Bydrawingconclusions.
质量m＝1.0kg的物块A可视为支点轻弹簧的上端连接弹簧下端固定在光滑斜面底端斜面的倾斜角θ＝30°．平衡时弹簧的压缩量为x＝0.20m此时具有的弹性势能Ep＝0.50J物块A处在O时弹簧为原长如图所示．一质量m＝1.0kg物块B可视为质点从距离物块A为d＝2.0m处从静止开始沿斜面下滑与物体A发生碰撞后立刻一起向下运动但不粘连它们到达最低点后又向上运动．g＝10m/s2求 1物块B与物体A碰撞后的速度 2物块B向上运动到达的最高点与O的距离s．
在图乙的电路中通入如图甲所示的交变电流此交变电流的每个周期内前三分之一个周期电压按正弦规律变化后三分之二周期电压恒定．电阻R的阻值为12Ω电表均为理想电表．下列判断正确的是
Unitthe1980sscientistsweretrainedtoignoreanimalpainaccordingtothebeliefthattheabilitytofeelpainwasassociatedonlywithhigherconsciousness.Howevertodayscientistsviewhumansasaspeciesofanimalsandlargelyacceptthatmanyspeciesarecapableofsomelevelofself﹣awareness.1 Ifyouhitanotherpersoninthefaceyoucanestimatetheirpainlevelbywhattheydoorsayinresponse.2Graduallyscientistshavedevelopedasetofindicatorsofpainresponseinnon﹣humananimals.Demonstratingaresponsetoanegativestimulationanddisplayingprotectivebehaviorofinjuredareasaretwomajorsigns. 3Someresearchersarguelobsters龙虾aretoodissimilartovertebrates脊椎动物tofeelpain.Nonethelesslobstersdosatisfyallofthestandardsforapainresponse.Lobstersguardtheirinjuriesandlearntoavoiddangeroussituations.Theyareevenbelievedtopossesssomelevelofconsciousness.Inresulttodaymostscientistsagreethatinjuringalobstercausesphysicalpain. Duetogrowingevidencethatthelobstersmayfeelpainitisnowillegaltoboillobstersaliveorkeepthemoniceinsomecountries.Eveninlocationswhereboilinglobstersremainslegalmanyrestaurantsprefermorehumanemethods.4Tosatisfypickydinersmorerestaurantsruleoutthecruelcookingmethods. CurrentlythemosthumanetoolforcookingalobsteristheCrustaStun.Thisdeviceelectrocutes电击alobster.5Thefollowingprocessofcookingissuretocausenopain.Incontrastittakesabout2minutesforalobstertodiefromboilingwaterduringwhichtimepainlasts. A.Buthugedisagreementexists. B.Thecreatureinstantlylosesconsciousnessinhalfasecond. C.Itbeatstheformermethodbysavingchefs'effortincleaningthecreature. D.It'sdifficulttoassesspaininotherspeciesbecausewecannotcommunicateaseasily. E.Peoplearecomingtorealizethatotherspeciesmightalsoenjoytheluxuryofemotion. F.Exceptformoralconsiderationmanychefsbelievestressnegativelyaffectstheflavor味道ofthemeat. G.Legalprohibitionbecomesthemajorconsiderationforrestaurantswhenchoosingacookingmethod.
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