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在课外活动课上，小明利用装满有色液体的小瓶、橡皮塞和玻璃管自制了一支简易的液体温度计 （1）该温度计是根据 的规律来工作的（2）当小明将自制的温度计浸入热水中时，发现该温度计玻璃管中液柱的上升不...
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往玻璃管上套橡皮管或橡皮塞时应做到
管端应烧圆滑
沾少量水或甘油于橡皮管或橡皮塞内部
用布裹手或带厚手套，以防割伤
如图所示在小瓶里装一些带颜色的水再取一根两端开口的细玻璃管在它上面画上刻度使玻璃管穿过橡皮塞插入水中
如图所示在小瓶里装一些带颜色的水再取一根两端开口的细玻璃管在它上面画上刻度使玻璃管穿过橡皮塞插入水中
下列有关仪器连接的描述错误的是
橡皮塞旋进容器口
玻璃导管口附近沾水后旋进乳胶管
分液漏斗下端玻璃管压进橡皮塞孔中
玻璃导管沾水后旋进橡皮塞孔中
课外活动课外活动
教学设计题 现有橡皮膜三叉玻璃管橡皮塞气球及无底的玻璃瓶等材料设计一个利用该教具进行演示的教学过程
在小瓶内装一些带颜色的水.给小瓶配一个橡皮塞橡皮塞内插一根细玻璃管使橡皮塞塞住瓶口如图所示.下列说法
去掉橡皮塞，不影响温度计的使用
换用不同液体，温度计测量的范围相同
玻璃管越粗，水沿着细玻璃管上升和下降得越明显
将小瓶放到盛有热水的容器中，瓶中的水将沿细玻璃管上升
在小瓶内装一些带颜色的水．给小瓶配一个橡皮塞橡皮塞内插一根细玻璃管使橡皮塞塞住瓶口下列说法正确的是A
如图所示在小瓶里装一些带颜色的水再取一根两端开口的细玻璃管在它上面画上刻度使玻璃管穿过橡皮塞插入水中
图是某同学自制的盛水容器的示意图容器口的橡皮塞中插有一根两端开口的玻璃管橡皮塞与玻璃管之间橡皮塞与容
玻璃管外的水面下降
玻璃管口的水面上升
容器底内表面a点的压强不变
容器内玻璃管外的气体压强变大
如图是小红利用小瓶橡皮塞和玻璃管口自制的液体温度计.该温度计是根据__________规律来工作的.
下列实验操作不正确的是
未说明药品用量时，液体取2~3ml左右，固体只需盖满试管底部
为了防止试剂污染,滴管应悬空在试管上方滴加液体,不要直接接触试管
把玻璃管插入带孔橡皮塞，先把玻璃管一端润湿，然后稍用力转动使之插入橡皮塞内
玻璃仪器内壁附着的水既不聚成水滴，也不成股流下时，表示仪器洗涤干净
在小瓶里装适量带色的水再取一根两端开口的细玻璃管在它上面画上刻度使玻璃管穿过橡皮塞插入水中从管子上端
某物理兴趣小组的同学设计了图12甲所示的实验装置在橡皮塞中紧密地插入一根细玻璃管将此橡皮塞盖紧在装满
如图所示在小瓶里装一些带颜色的水再取一根两端开口的细玻璃管在它上面画上刻度使玻璃管穿过橡皮塞插入水中
伽利略制造了世界上第一只温度计它是由长颈玻璃瓶倒插在液体槽里制成的．如图8甲所示当外界温度升高时玻璃
2012四川绵阳第26题第1小题如图是教科书自制温度计的演示实验实验装置是在小瓶里装一些带颜色的水给
如图是教科书自制温度计的演示实验实验装置是在小瓶里装一些带颜色的水给小瓶配一个橡皮塞橡皮塞上先插进一
如图所示一个玻璃瓶瓶中装满水把一细玻璃管通过带孔的橡皮塞插入瓶中用手捏玻璃瓶时发现玻璃管中液面升高说
伽利略制造了世界上第一只温度计它是由长颈玻璃瓶倒插在液体槽里制成的如图8甲所示它利用的是瓶中气体的热
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先化简1﹣•再在123中选取一个适当的数代入求值．
小亮和同学们想用一些测量工具和所学的几何知识测量学校旗杆的高度检验自己掌握知识和运用知识的能力如图在阳光下小亮站在水平地面的D处此时小亮身高的影子顶端与旗杆的影子顶端E重合这时小亮身高CD的影长DE＝1米一段时间后小亮从D点沿BD的方向走了2.6米到达G处此时小亮身高的影子顶端与旗杆的影子顶端H重合这时小亮的影长GH＝1.4米已知小亮的身高CD＝FG＝1.6米点GED均在直线BH上AB⊥BHCD⊥BHGF⊥BH请你根据题中提供的相关信息求出旗杆的高度．
已知一个圆的半径为5cm则它的内接正六边形的边长为．
FrancieNolanisan11﹣year﹣oldgirl1liveintheslums贫民窟ofBrooklynNewYork.Herfamily2besopoolthatsheandherbrotherhavetocollectjunktoexchangeformoney.ButNolanishumbleandworkshard3changeherlife.Shehelpshermotherdohouseworkandspendseveryafternoon4readatthelibrary.Howeverbecauseof5poorNolanhastoleavehighschoolandfindajob6lifeisfullofupsanddowns. Thisis7storyofthenovelATreeGrowsinBrooklynbyUSauthorBettySmith.First8publishin1943thenovelcoversfivedifferentperiodsinNolan'slife.Millionsofreaders9inspirebyNolan'sbittersweetstoryeversince.Itwasnamed10oneofthebestbooksofthe20thcenturybytheNewYorkPublicLibrary.
如图AB是⊙O的弦过AB的中点E作EC⊥OA垂足为C过点B作⊙O的切线BD交CE的延长线于点D 1求证DB＝DE 2连接AD若AB＝24DB＝10求四边形OADB的面积．
MarkhaslivedinChinaformanyyearsyethestillcan'thimselftotheChinesecustoms.A.observe B.adapt C.lead D.devote
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Tianjinsoccerfanswonderhowlongitwillbethepopularsoccerstar﹣SunkecanappearinthefieldsinTianjinasamemberofTianjinTianhaisoccerteam.A.before B.since C.until D.where
问题提出 1如图1已知在△ABC∠B＝30°∠C＝45°BC＝2+2求点A到BC的最短距离． 2如图2已知边长为3的正方形ABCD点EF分别在边AD和BC上且AE＝ADCF＝BC连接MN求线段MN长度的最小值． 问题解决 3如图3已知在四边形ABCD中AB＝AD＝3CB＝CD＝2∠ABC＝60°连接BD．将线段BD沿BA方向平移至ME点D的对应点为点E点N为射CD上一点且DN＝BM连接MNMN的长度是否存在最小值若存在求出最小值若不存在请说明理由．
如图在平面直角坐标系中▱AOBC的边AO在x轴上经过点C的反比例函数y＝k≠0交OB于点D且OD＝2BD若▱AOBC的面积是5则k的值是．
DarkSkyparksaroundtheworld WarrumbungleNationalPark SituatedinthecentralwestslopesofNewSouthWalesisAustralia'sonlydarkskyparkWarrumbungle.TheparkhasservesasadarkskyparksinceJuly2016.Itscrystal﹣clearnightskiesandhighattitudemakeitanaturaleducationalandastronomicalheritagesiteinthesouthernhalfoftheearth.TouristscanuseAustralia'slargestopticaltelescopewithintheparkboundariestoviewtheauroras极光theMilkyWayandfaintshootingstars. Sark SarkisaChannelIslandnearthecoastofNormandyundertheprotectionoftheUK.ItwastheWorld'sFirstDarkSkyIslandsetupinJanuary2011.Itshistoricalandculturalblendattractsover＝400000touristsannually.Withnomotorvehiclesandpubliclightingontheislandthereisanexceptionalviewofthedarkskies.ArichMilkyWayisvisibleinthedarknightskiesfromtheshoresoftheisland. PicduMidideBigorre PicduMidideBigorreinFrancewasdesignated指定asadarkskyparkinDecember2013makingitthesecondlargestdarkskyparkintheworld.Theparkcovers3112squarekilometersspreadacrossthePyreneesNationalParkandUNESCO'sWorldHeritagesitePyrenees﹣MontPerdu.Theparkattractsoveronehundredstarwatcherseveryyear.TheObservatoryMidi﹣Pyreneeswhichwasbuiltin1870isoneoftheworld'shighestmuseumsataheightof2877metersabovesealevel. RamonCrater/MakhteshRamon RamonCraterisaunique1100﹣square﹣kilometernaturereservelocatedintheNegevDesertinIsrael.In2017theRamonCraterbecamethefirstdesignateddarkskyparkintheMiddleEast.ItslocationroughclimateandforbiddinglandscapethatarecharacteristicoftheNegevhavelargelydefeatedhistoricalattemptsforhumansettlementmakingitagreatplacetoviewthenightskies.StargazersusuallycampinthedeserttohaveanuninterruptedviewofthestarsplanetsandtheMilkyWay. 1Whichparkservesasaheritagesiteforastronomy? A.Sark B.PicduMidideBigorre C.RamonCrater/MakhteshRamon D.WarrumbungleNationalPark 2WhatdoweknowaboutSarkfromthepassage? A.Notasinglecarrunsthere. B.ItwasanislandbelongingtoNormandy C.TheMilkyWaycanonlybeseenthere D.Visitorsliketostayontheislandingroups 3WhatmakesitdifficultforhumanstoliveinRamonCrater A.Highaltitude B.Thelargearea C.Geographicalconditions D.Culturalfeatures
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在学校组织的知识竞赛中八1班比赛成绩分为ABCD四个等级．其中相应等级的得分依次记为100分90分80分70分学校将八1班成绩整理并绘制成如下的统计图请你根据以上提供的信息解答下列问题． 1请补全条形统计图 2八年级一班竞赛成绩的众数是中位数落在类 3若该校有1500名学生请估计该校本次竞赛成绩为B类的人数
HaveyouevercaughtyourselfsayingIhatesmalltalk!theminuteyouwalkintoaparty?Ifsoyoumightbeanintrovert内向的人.Introvertshatetochataboutsmallsubjectswithpeople.Theyarefinewhenyoutalkoneononebutseemtogetlostinthecrowdwhenthere'sagrouparound. Ifyou'retalkingtoanintrovertyoumightfindthatyourfirstfewconversationsgooneoftwoways.Eitherthey'llseemtogetboredandnotsaymuchorthey'llseemtoskateoversmalltalkinfavorofmorein﹣depthtopics.Whatyouneedtoknowisthattheintrovertisnotbeingrude.It'sjustthattheydon'tlikesmalltalk.Here'swhy. Smalltalkservesasagatewaytowarddeeperconversation.Someintrovertsdon'trealizethatsmalltalkwillactuallyhelpthemgettothebiggertopics.Youdon'tneedtostayonsmalltalkforever.Howeversometimesintrovertsfeelthateventheshortamountoftimeittakestogetintotherealconversationisawasteoftime.Smalltalkisveryfast.Someonesayssomethingandthisshouldbefollowedupwithaquickresponse.Butintrovertsliketochewontheirwordsbeforesayingthemaloud.Beforetheyanswerthey'llmulloverdifferentthoughts. Smalltalkbyitsverynatureinvitesmorepeopletojoinin.Themorepeoplewhojointheconversationthemoretheintrovertwilltendtostepback.Asaresultthey'llbequiet.Smalltalkisaboutthrowingoutsubjectsinthehopethatoneormoreofthemcanbeturnedintoacommonpointofinterest. Thelisteninginvolvedwithsmalltalkisnotin﹣depth.Thepurposeisaboutlisteninglightlysoyoucanfigureouttherighttopicstospendsometimeon.Introvertstendtobegreatlistenersbuttheyuseactivelisteningratherthanlightlistening.Thismakesthemwonderfulfriendsbutcanalsomakeitdifficultfornewpeopletounderstandwhythey'resoquiet. 1Howdointrovertsrespondtoachat? A.Theytrytoavoidit. B.Theygetexcitedaboutit. C.Theygiveittheirfullattention. D.Theyfocusonunimportanttopics. 2Whatdoweknowaboutsmalltalk? A.Itgoesslowly. B.Itcostspeoplealotoftime. C.Itcontributestodeepertopics. D.Itmakesnosense. 3WhatdoestheunderlinedphrasemulloverinParagraph3probablymean? A.Giveup. B.Thinkover. C.Writedown. D.Forgetabout. 4Howcanwebecomeagoodtalkerinsmallconversations? A.Figureoutthedeepmeaningofquestions. B.Thinktwicebeforeansweringquestions. C.Trytofindsharedtopics. D.Beaquietlistener.
如图已知二次函数y＝ax2+bx﹣4的图象M经过A﹣10C2﹣6两点顶点为P． 1求该二次函数的解析式和顶点P的坐标 2设图象M的对称轴为l点Dmn﹣1＜m＜2是图象M上一动点当△ACD的面积为时点D关于l的对称点为E能否在图象M和l上分别找到点PQ使得以点DEPQ为顶点的是四边形为平行四边形若能求出点P的坐标若不能请说明理由．
一个不透明的口袋中装有4个分别标有数1234的小球它们的形状大小完全相同小红先从口袋里随机摸出一个小球记下数为x小颖在剩下的3个球中随机摸出一个小球记下数为y这样确定了点P的坐标xy． 1小红摸出标有数3的小球的概率是． 2请你用列表法或画树状图法求点Pxy在函数y＝﹣x+5图象上的概率．
如图在Rt△ACB∠BCA＝90°∠A＝30°AC＝点D在线段AB上点E在线段AB的延长线上且BE＝AD则CE+CD的最小值是．
Thissemesterourschooloffersmanyoptionalcoursesforthestudentsappealstomanystudents.A.eachofwhich B.allofwhom C.eachofwhom D.allofwhich
Coldweatherduringwintermonthsmaykeepmanypeoplefromleavinghomeandrunningintheopenair.Howeveranewstudyshowsthatthedropintemperatureisagoodreasontorun.1 Manypeoplesayrunninginwintercanbedifficult.Tworeasonsarethelowtemperaturesandbitterwinds.2Thatcouldbebecauselowertemperaturesreducestressonthebody.Whenyourunincoldweatheryourheartrateandthebody'sdehydration脱水levelsarelowerthaninwarmerconditions.3 ThisinformationcomesfromJohnBrewerwhoisaprofessorofappliedsportscienceatSt.Mary's.Forthisstudyheandotherresearchersputagroupofpeopleintoaroomtheycalledanenvironmentalchamber.Theresearchersthenrecreatedsummerandwinterweatherconditionsintheroom.4Brewersaysheandhisteamrecordedbiologicalmeasurementsoftherunners. Hesaysthatthemostimportantthingforpeoplewhorunincoldconditionsistoweartherightclothing.Wearglovesonyourhands.5 Andespeciallywearmorethanonelayerofclothingtokeepsweatawayfromyourskin. A.Yetmanyrunnersmightfinditeasierthanrunninginhotweather. B.Wehavegoodreasonstoruninwinter. C.Wearshoesthatwillkeepyoufromfalling. D.Manyfeelnervouswhenrunninginthecoldweather. E.Thebodyneedslesswateronacolddaythaninwarmweather. F.Infactrunningincoldweatherhelpsimproveone'sperformance. G.Thetestsubjectswereaskedtorun10000metersunderbothconditions.
碑林书法社小组用的书法练习纸毛边纸可以到甲商店购买也可以到乙商店购买．已知两商店的标价都是每刀20元每刀100张但甲商店的优惠条件是若购买不超过10刀则按标价卖购买10刀以上从第11刀开始按标价的七折卖乙商店的优惠条件是购买一只9元的毛笔从第一刀开始按标价的八五折卖设购买刀数为x刀在甲商店购买所需费用为y1元在乙商店购买所需费用为y2元． 1写出y1y2与xx＞0之间的函数关系式 2求在乙商店购买所需总费用小于甲商店购买所需总费用时x的取值范围．
二次函数＝ax2+bx+cabc为常数且a≠0中x与y的部分对应值如下表下列结论正确的个数有①ac＜0②当x＞1时y的值随x值的增大而减小③4是方程ax2+b﹣2x+c+9＝0的一个根④当﹣1＜x＜3时ax2+b﹣1x+c＞0
已知直线y＝kx+bk≠0过点﹣10且与直线y＝3x﹣6在第四象限交于点M则k的取值范围是
Itisnotsurprisingthatshewaselectedmonitor;sheisverysmartgirlwhohastheabilitytoorganizetheclasswell.A./;the B./;a C.a;a D.the;/
如果正比例函数y＝kxk≠0的图象经过第二四象限那么一次函数y＝kx+k的图象经过
如图在矩形ABCD中点EF分别在边ABBC上且BE＝2AE将矩形沿直线EF折叠点B恰好落在AD边上的点P处连接BP交EF于点Q下列结论正确的是
25分假设你是遂宁某中学高三学生李华你的美国朋友Jim想了解你校学生课外阅读情况.请你回一封邮件内容包括: 1.你校学生课外阅读现状; 2.原因分析 3.你的看法. 注意:1.词数120; 2.开头和结尾已给出不计入总词数. 提示词:课外阅读extracurricularreading DearJim Inyourlastletteryoutoldmethatyouwantedtolearnsomethingabouttheextracurricularreadinginourschool. Yours LiHua
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