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一定质量的理想气体由状态a经状态b、c到状态d，其体积V与热力学温度T关系如图所示，O、a、d三点在同一直线上，ab和cd平行于横轴，bc平行于纵轴，则下列说法正确的是（ ）
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某同学利用DIS实验系统研究一定质量理想气体的状态变化实验后计算机屏幕显示如下的P-t图象已知在状态
如图所示一定质量的理想气体先从状态A.经等容过程到状态B.再经等压过程到状态C.在状态C.时气体的体
图为一定质量理想气体的压强P.与体积V.的关系图象它由状态A.经等容过程到状态B.再经过等压过程到状
理想气体是指一定质量的理想气体在状态变化的某一稳定瞬时其压力温度体积应服从一定质量的气体和外界没有热
一定质量理想气体的状态变化如图所示则该气体
状态b的压强大于状态c的压强
状态a的压强大于状态b的压强
从状态c到状态d，体积减小
从状态a到状态c，温度不变
一定质量的理想气体从状态A.变化到状态B.再变化到状态C.其状态变化过程的p—V.图线如图所示已知该
一定质量理想气体的压强P.随体积V.的变化过程如图所示CA是双曲线的一段在此过程中
气体从状态A.到状态
，温度降低，内能减少 B.气体从状态B.到状态
，一定向外放出热量，内能不变 C.气体从状态B.到状态C.，一定从外界吸收热量，内能增加
气体从状态C.到状态A.，温度升高，内能增大
如图为一定质量理想气体的压强P.与体积V.关系图像它由状态
经等容过程到状态
，再经等压过程到状态
。设A.B.C.状态对应的温度分别为TA.TB.TC，则下列关系式中正确的是 （A.）TA＜TB，TB＜TC （B.）TA＞TB，TB＜TC （C.）TA＞TB，TB =TC （
）TA = TB，TB＞TC
如图所示一定质量的理想气体发生如图所示的状态变化状态A.与状态B.的体积关系为VA▲VB选填大于小于
一定质量的理想气体从状态A.经过状态B.变化到状态C.如图所示图中BC是平行于横轴的直线已知气体在状
一定质量理想气体的状态变化如图所示则该气体
状态b的压强大于状态c的压强
状态a的压强大于状态b的压强
从状态c到状态d，体积减小
从状态a到状态c，温度不变
【物理3-3】8分一定质量理想气体的p-v图象如图所示其中a→b为等容过程b→c是等压过程c→a为等
一定质量的理想气体由状态A.经状态B.变化到状态C.的p-V.图象如图所示.在由状态A.变化到状态B
一定质量理想气体的状态变化如图所示则该气体
状态b的压强大于状态c的压强
状态a的压强大于状态b的压强
从状态c到状态d，体积减小
从状态a到状态c，温度不变
一定质量的理想气体从状态A.经过等温膨胀到状态B.然后经过绝热压缩过程到状态C.最后经过等压降温过程
封闭在汽缸内一定质量的理想气体由状态
变到状态D.，其体积V.与热力学温度T.的关系如图所示，由状态A.变到状态D.过程中（ ） A.气体从外界吸收热量，内能增加
气体体积增大，单位时间内与器壁单位面积碰撞的分子数减少
气体温度升高，每个气体分子的动能都会增大
气体的密度不变
图为一定质量理想气体的压强P.与体积V.的关系图象它由状态A.经等容过程到状态B.再经过等压过程到状
某同学研究一定质量理想气体的状态变化得出如下的P-t图象已知在状态B.时气体的体积VB=3L求①气体
一定质量的理想气体从状态A.变化到状态B.再变化到状态C.其状态变化过程的P-T图象如图所示已知该气
如图所示一定质量的理想气体沿图线从状态a经状态b变化到状态c在整个过程中其体积
）逐渐增大 （
）逐渐减小 （
）先减小后增大 （
）先增大后减小
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在正方体ABCD﹣A1B1C1D1中E为棱CD上一点且CE＝2DEF为棱AA1的中点且平面BEF与DD1交于点G则B1G与平面ABCD所成角的正切值为
设F1F2分别是离心率为的椭圆E＝1a＞b＞0的左右焦点经过点F2且与x轴垂直的直线被椭圆截得的弦长为．1求椭圆E的方程2设直线ly＝x+m与椭圆E交于AB两点线段AB的垂直平分线交x轴点P当m变化时求△PAB面积的最大值．
10分假定英语课.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. 修改在错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处多者从第11处起不计分. WelcometotheGreatWall.Measuredmorethan6000kilometersinlengththeGreatWallisknownasthelongwallintheworld.Ithasalonghistoryofmorethan2000years.ThatisamazingabouttheGreatWallisthatitismainmadeofstonesandbricksandalltheconstructionwasdonebyhand.ThoughitwasusedtoprotectthecountryfromforeigninvaderseveryfewhundredmetersalongwiththeGreatWalltherewasawatchtower.NowassymbolofChinatheGreatWallwillbecomeoneofthemostfamoustouristattractionsintheworld.ItisnowonderfulthattheGreatWallattracthundredsofthousandsofforeigntouristseveryyear.
30分Stevewasaseventhgraderabigboylookingmorelikeateenagerthana12﹣year﹣old.Yethewentunnoticed﹣﹣hehadbeen1everyexaminationsincefirstgrade一untilMissWilma. Inthemiddleofthefirstsemesterofschooltheentireseventhgradewas2forbasicskills. YoualldidprettywellMissWilmatoldtheclassaftergoingoverthe3.exceptforoneboy.Andit4myhearttotellyouthisbut..she5thesmartestboyintheseventhgradeisfailingmyclass.Steve6hiseyesandcarefullyexaminedhisfingertips. AfterthatStevestillwouldn'tdohishomework.EvenifMissWilma7punishedhimheremained8 Steveplease!Icareaboutyou! 9Stevegotit!SomeoneCARESABOUTME?! OneMondayacoupleofweekslaterMissWilmagavea10ontheweekendhomework.Steve11throughthetestandwasthefirsttohandinhispaper.Withalookof12MissWilma1ookhispaperandbegantolookitover. MissWilma'sfacewasin13shock!SheglancedupatStevethen14then up.Thesmartestboyintheseventhgradehadjustpassedhisfirsttest! FromthatmomentnothingwasthesameforSteve.Hediscoveredthatnotonlycouldherememberandunderstand15buthecouldtranslatewhathelearnedintohislife.Hebecame16 AfterhighschoolSteveenlistedintheNavyandhehadan17militarycareer.Duringhisnavalyearsheinspiredmanyyoungpeoplewhomightnothave18themselveswithouthim. A19tookplacewithintheheartofaboyallbecauseofoneteacherwho20. 1A.missing B.failing C.passing D.skipping 2A.tested B.classified C.separated D.dismissed 3A.questions B.effects C.lessons D.results 4A.fills B.presses C.breaks D.destroys 5A.shouted B.hesitated C.interrupted D.laughed 6A.dropped Braised C.covered D.closed 7A.strangely B.steadily C.severely D.secretly 8A.helpless B.stubbom C.flexible D.crazy 9A.Commonly B.Unwillingly C.Particularly D.Suddenly 10A.quiz B.chance C.speech D.presentation 11A.slept B.looked C.lived D.hurried 12A.disppointment B.surprise C.satisfaction D.inspiration 13A.btter B.total C.precious D.ridiculous 14A.down B.away C.out D.back 15A.homework B.grades C.knowledge D.subjccts 16A.outstanding B.lazy C.rough D.troublesome 17A.tiring B.ordinary C.hardworking D.successful 18A.reliedon B.lookedafter C.turnedto D.believedin 19A.competition B.choice C.change D.campaign 20A.waited B.listened C.wished D.cared
设集合A＝{x|x+1≤3}B＝{x|4﹣x2≤0}则A∩B＝
从某校高三上学期期末数学考试成绩中随机抽取了60名学生的成绩得到如图所示的频率分布直方图 1根据频率分布直方图估计该校高三学生本次数学考试的平均分 2若用分层抽样的方法从分数在[3050和[130150]的学生中共抽取6人该6人中成绩在[130150]的有几人 3在2中抽取的6人中随机抽取2人求分数在[3050和[130150]各1人的概率．
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WhenshefirststartedlearningabouttheclimatechangefromoneofhereldersFawnSharpwasinvitedonahelicopterflightovertheOlympicMountainstosurveytheMountAndersonglacier冰川.Buttheglacierwasgonemeltedbythewarmingclimate.Sharphadadeepsenseoflosswhenshediscoveredtheglacierwasn'tthereanymore. Lossisagrowingissueforpeopleworkingandlivingonthefrontlinesofclimatechange.AndthatgaveJenniferWrenAtkinsonafll﹣timelecturerattheUniversityofWashingtonBothellUSanideaforaclass. ThistermshetaughtstudentsontheBothellcampusaboulthecmotionalburdensofenvironmentalstudy.SheusedtheexperiencesofNaliveAmericantribes部落scientistsandactivistsandaskedher24studentstofacetherealitythatthereisnoeasyfix﹣﹣thatthisissuchanintractableproblemthatthey'regoingtobedealingwithitfortherestoftheirlives. StudentCodyDillonusedtobeaclimatescienceskeptic怀疑论者.Thenhedidhisownreadingandresearchandchangedhismind. Dillonwasn'tgoingintoenvironmentalwork﹣﹣hewasacomputer﹣sciencemajor.Yetthepotentialforaworldwideenvironmentalcatastropheseemedsorealtohimfiveyearsagothathequithisjobandbecameafll﹣imevolunteerforanenvironmentalgroupthatworkedonrestoration恢复projects. SixmonthsintotheworkhedecidedthatAlkinson'sclasswasjustwhathewaslookingfor﹣﹣aplacewherehecoulddiscusshisconcernsaboutachangingclimate. Atkinsonsaidshehopestheclasshelpedherstudentspreparethemselvesfortheamountofenvironmentallossthatwillhappenovertheirlifetimes. Wearealreadychangingtheplanet﹣.somanyspeciesaregoingtobelostdisplacedormassivelyimpacted巨大影响的shesaid.Thefutureisn'tgoingtobewhattheyimagined. 1WhydidtheauthormentionthecaseofFawnSharp? A.TolayabasisforFawnSharp'sfurtherresearch. B.ToproveFawnSharp'sworkissimilartoAtkinson's. C.Toleadintotheissueoflosscausedbyclimatechange. D.Toshowscientists'concernabouttheMountAndersonglacier. 2What'sthemainpurposeofAtkinson'sclass? A.Toexplorehowdifferentpeopledealwithclimatechange. B.Togetstudentsmoreconcernedaboutenvironmentalissue. C.TofindsolutinstotheOlympicMountainsenvironmentalissue. D.Toteachstudentshowtoconductaresearchaboutenvironment. 3WhichofthefollowingbestexlainsintractableunderlinedinParagraphThree? A.Simple. B.Difficult. C.Common. D.Interesting. 4HowdidAtkinson'sclassinfluenceDillon? A.Dillonworkedasapart﹣timevolunteerforrestorationprojects. B.Itmadehimrealizeaplanet﹣wideclimatedisasterwouldhappen. C.Itencouragedhimtobemoreinvolvedinenvironmentalprotection. D.Itdiscouragedhimtoworkonrestorationprojectsfortheenvironment.
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若函数fx＝m+sinx﹣cosx的最大值为0则m＝
若函数fx＝m+sinx﹣cosx的最大值为0则m＝
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