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如图是探究平面镜成像特点的实验装置，a为玻璃板，b为点燃的蜡烛，c是和b完全相同但未点燃的蜡烛．则下列说法错误的是（ ）
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在探究平面镜成像特点的试验中1如图所示在玻璃板前面放置一支点燃的蜡烛再拿一支没有点燃的相同的蜡烛在玻
如图是探究平面镜成像的特点的实验装置.1实验中用玻璃板代替平面镜主要利用了玻璃透明的特点便于确定玻璃
是探究平面镜成像特点的实验装置1用玻璃板代替平面镜主要是利用玻璃板透明的特点便于2使点燃的蜡烛在两个
如图是探究平而镜成像特点的情景竖立的透明玻璃板下方放一把直尺直尺与玻璃板垂直两支相同的蜡烛A.B.竖
在探究平面镜成像的特点时我们用玻璃板代替平面镜做实验1在玻璃板前面放置一支点燃的蜡烛再拿一支没有点燃
如图所示是探究平面镜成像特点的实验装置.1用玻璃板代替平面镜主要是利用玻璃板透明的特点便于_____
在探究平面镜成像的特点时用玻璃板代替平面镜的目的是实验时将点燃的蜡烛放在玻璃板前眼睛应该在玻璃板选填
如图1是探究平面镜成像特点的实验装置.1除图1所示的实验仪器外还需用到的测量工具是.2实验时玻璃板要
如图是探究平面镜成像特点的实验装置a为玻璃板b和c是两支完全相同的蜡烛.下列说法中错误的是
实验既可选择玻璃板，也可选择平面镜
实验时玻璃板a应与水平桌面垂直放置
选择完全相同的b、c两支蜡烛是为了验证像与物是否等大
利用该实验可以验证平面镜成像中的像距和物距是否相等
如图1是探究平面镜成像特点的实验装置a为玻璃板b和c是两支完全相同的蜡烛下列说法错误的是
为了保证实验效果应选择较厚的玻璃板
实验时玻璃板a应与水平桌面垂直放置
竖立在玻璃板后面移动的蜡烛c不用点燃
该实验最好在较暗的环境中进行
如图是小勇同学探究平面镜成像特点的实验装置1在实验中用透明的玻璃板代替平面镜主要是利用玻璃板透明的特
如图1是探究平面镜成像特点的实验装置.1除图1所示的实验仪器外还需用到的测量工具是刻度尺.2实验时玻
图研究平面镜成像特点的实验装置①此实验中用玻璃板代替平面镜要是利用玻璃板透明的特点便于通过玻璃板找到
如图1是探究平面镜成像特点的实验装置a为玻璃板b和c是两支完全相同的蜡烛下列说法错误的是
为了保证实验效果应选择较厚的玻璃板
实验时玻璃板a应与水平桌面垂直放置
竖立在玻璃板后面移动的蜡烛c不用点燃
该实验最好在较暗的环境中进行
图17是研究平面镜成像特点的实验装置①此实验中用玻璃板代替平面镜主要是利用玻璃板透明的特点便于通过玻
如图是小芳同学探究平面镜成像的特点的实验装置 实验时小芳同学应在填M或N侧观察蜡烛M经玻璃板
如图是探究平面镜成像特点的实验装置a为玻璃板b和c是两支完全相同的蜡烛下列说法错误的是
为了保证实验效果应选择较薄的玻璃板
实验时玻璃板a应与水平桌面垂直放置
沿水平桌面移动蜡烛c前应先将点燃
该实验最好在较暗的环境中进行
如图是小勇同学探究平面镜成像特点的实验装置.1在实验中用透明的玻璃板代替平面镜主要是利用玻璃板透明的
云南中考如图是探究平面镜成像特点的实验装置.1除图1所示的实验仪器外还需用到的测量工具是______
在探究平面镜成像的特点时用玻璃板代替平面镜的目的是实验时将点燃的蜡烛放在玻璃板前眼睛应该在玻璃板
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下列实验现象描述正确的是
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称取一定质量的氯酸钾和二氧化锰的混合物放入大试管中加热至质量不再变化为止．实验测得固体混合物质量随加热时间变化的相关数据如图所示．请计算 1生成氧气多少克 2求原混合物中氯酸钾的质量分数．
下列图象不能正确反映其对应变化关系的是
尿素[CONH22]是含氮量较高的氮肥．工业上以CO2等物质为原料合成尿素发生反应的化学方程式为CO2+2X＝CONH22+H2O其中X的化学式是
12.5分An80﹣year﹣oldmanwassittingonthesofainhishousealongwithhis45﹣year﹣oldhighlyeducatedson.Suddenlyacrow乌鸦perchedonthetreeneartheirwindow.ThefatheraskedhissonWhatisthis?ThesonrepliedItisacrow.AfterafewminutesthefatheraskedhissonthesecondtimeWhatisthis?ThesonsaidFatherIhavejustnowtoldyouIt'sacrow.AfteralittlewhiletheoldfatheragainaskedhissonthethirdtimeWhatisthis?It'sacrowacrowacrow.saidthesonloudly.AlittleafterthefatheragainaskedhissonthefourthtimeWhatisthis?ThistimethesonshoutedathisfatherWhydoyoukeepaskingmethesamequestionagainandagain?'ITISACROW'.Areyounotabletounderstandthis? Alittlelaterthefatherwenttohisroomandcamebackwithanolddiarywhichhehadkeptsincehissonwasborn.Onopeningapageheaskedhissontoreadthatpage.Whenthesonreaditthefollowingwordswerewritteninthediary Todaymylittlesonagedthreewassittingwithmeonthesofawhenacrowwasthereonthewindow.Mysonaskedme23timeswhatitwasandIrepliedtohimall23timesthatitwasacrow.Ihuggedhimlovinglyeachtimeheaskedmethesamequestionagainandagainfor23times.IdidnotatallfeelannoyedIratherfeltaffectionformyinnocentchild. 1Whatdoestheunderlinedwordperchedmeaninthepassage? A.dropped B.struck C.rested D.knocked 2InwhattonedidthesonsaytohisFatherIt'sacrowacrowacrow.? A.impatient. B.hurried. C.worried. D.surprised. 3WhydidtheFatheraskthesamequestionagainandagain? A.Becausehewantedtoseethereactionofhisson. B.Becausehewastoooldtorememberanything. C.Becausehewantedtomakehissonangry. D.Becausehecouldn'tunderstandwhathissonsaid. 4Howoldwastheoldmanwhenhissonaskedhim23timesWhatisthis? A.80yearsold. B.45yearsold. C.38yearsold. D.42yearsold. 5Thewritermainlyintendsto. A.tellusthefunctionofadiaiy B.teachuswhatacrowis C.callonustoloveourparents D.introduceapairofsonandfather
用相关序号填空生活中经常接触到下列物质 A．蛋白质B．碳酸钠C．活性炭D．硫酸铜E．盐酸F．天然气 1常用作洗涤剂的是 2可用于吸附异味的是 3豆浆中的主要营养物质是 4常用于金属除锈的是 5常用于游泳池消毒的是 6常用于家庭燃料的是．
下列物质属于混合物的是
25分概要写作.阅读下面短文根据其内容写一篇60词左右的内容概要. AccordingtoastudyattheUniversityofMarlandMedicalCenterinBaltimoreresearchersfoundthatpeoplewhohadagoodsenseofhumorandlaughedalotnotonlyathomebutalsoatworkhadfewerheartproblemsthanpeoplewholaughedlessandlaughingpeopletendtolivealongerlifethantheoneswhoarenot. AfterreadingplentyofinformationaboutthebenefitsoflaughingandacarefulstudyofpreviouspapersinthisareaadoctorinIndiastartedalaughterclub.Dr.MandanDamaris'slaughterclubquicklygrewinto1800groupsthroughoutIndiaandover6000aroundtheworld.ThelaughterclubhadeveninspiredWorldLaughterDaywhichpeoplecelebrateonthefirstSundayofMayeveryyear.InstructorsattheclubsgetpeoplelaughingnotonlythroughjokesbutthroughsimplelaughingexercisesForexampleinstructorsandparticipantsrepeatthechantho﹣ho﹣hoandha﹣ha﹣hatogether.What'smoreparticipantsalsodotheLionlaughbystickingouttheirtonguesandwavingtheirhandsaroundtheirears.Otherexercisesfocusonbreathingandsimpleyogaexercises.Inawordalltheactivitiesthatcancauselaughareincludedintheclubs. TheselaughterclubsareverypopularinhospitalsandnursinghomesnowadaysinIndiawhereparticipantscanforgetabouttheirachesandpainswhilelaughing.Itseemsthatlaughingmaybejustasimportantaseatingrightandexercising. Noteveryonecanjoinalaughterclubbutweallcantakepartinthesamepractice.Accordingtothedoctorbesidestakingpartintheclubseveryonecandosomethingtomakethemselveslaugh.Howcanyoumakelaughingapartofyourdailyroutine?Ifyoufeelfunnyaboutjoiningalaughterclubyoucanrentafunnymovierememberafunnyexperiencedosomesportsgotothezoowatchthemonkeysorevenjustmakeyourselflaugh.Youwillnotbeabletokeepastraightfaceallthetime. Sodon'tworrybehappy.Laughalittleandlivelonger. .
15分假设你是红星中学高三学生李华请给你校外教Jim写一封邮件邀请他参加你校即将举办的校史展.邮件的内容包括 1.介绍校史展的相关信息时间地点和主要内容等 2.说明邀请原因 3.询问对方意向. 注意1.词数不少于50 2.开头和结尾已给出不计入总词数. 提示词展览exhibition DearJim Yours LiHua
7分碱石灰是氧化钙和氢氧化钠的固体混合物是实验室常用的干燥剂．相关信息如图1所示．同学们为确认一瓶久置的碱石灰可能已部分变质或全部变质样品的成分进行如下探究．【提出问题】实验室中久置的碱石灰样品的成分是什么【进行猜想】久置的碱石灰样品中可能含有CaONaOHNa2CO3CaOH2CaCO3等成分．用化学方程式表示样品中可能含有Na2CO3的原因．【探究过程】如图2所示试回答下列问题1溶液C中一定含的阴离子是．填离子符号2溶液A中加入CaCl2溶液后产生固体说明样品中一定含有的物质是．【实验结论】依据上述实验操作过程及现象综合对滤液和固体成分的探究下列对样品成分的分析正确的是填序号．①样品中一定含NaOH②样品中一定含Na2CO3③样品中含NaOHCaO中的一种或两种．【拓展延伸】为测定实验室中一瓶变质的烧碱中NaOH的含量某同学取适量的烧碱样品溶于一定量的水得到溶液再加入稀硫酸足量充分搅拌到不再放出气泡为止称量溶液质量通过计算二氧化碳质量计算碳酸钠的质量．实验中用同浓度的硫酸分别与未变质部分变质或全部变质杂质都是Na2CO3的烧碱样品反应需要硫酸的质量请选择填空相等不等不能确定用质量守恒的角度解释其原因是．
下列化肥中属于复合肥料的是
8分Becauseofageingtheworldneedsaroboticsrevolution.Thequestionforallofusishowcanweusetechnologytomakethequalityoflifebetteraspeoplegetolder?SaysGillPrattamanwhohadpreviouslyrunacompetitiontofindartificiallyintelligentsemi﹣autonomousrobotsforthePentagon. Ageingandrobotsaremorecloselyrelatedthanyoumightthink. Ageingcreatesdemandforautomationintwoways.Firsttopreventoutputfromfallingasmorepeopleretireitisnecessarytousemachinesasareplacementforthosewhohavelefttheworkforceortoenableageingworkerstocontinuetodophysicallabor.Secondoncepeoplehaveretiredtheycreatemarketsfornewkindsofautomationincludingrobotsthathelpwiththemedicalandotherrequirementsofcaringforpeoplewhocannolongerlookafterthemselves. Automationisnottheonlywaytodealwithskillsshortagesbutitisoneofthemostimportant.Atthemomenttheroboticsmarketisledbyindustrialmachines.Asageingspeedsupservicerobotswhichenableoldpeopletolivealoneandhelpreducelonelinesswillbeingreatneed.Theywillmakeiteasiertolookafterpeopleinnursinghomesandenableolderworkerswhowanttostayemployedtokeepupwiththephysicaldemandsoflabor.Nowadaystherapeutic治疗的robotsdesignedforchildrenandpatientswithdementia痴呆andhuman﹣likerobotsthatcancarryoutconversationsonalimitedrangeoftopicshavealreadybeenputintouse. AccordingtotheInternationalFederationofRoboticsabout20000robotssoldin2018couldbedescribedashelpfultotheageing.Thatislessthan5%ofindustrialrobots.Thenumberwillundoubtedlygrow.Thequestionishowquickly.Mr.Prattisoptimistic.Overthepastfiveyearshearguestherehavebeenhugeadvancesinartificialintelligenceenablingmachinestosurpasshumansincertainkindsofinformationprocessing.Inotherwordsrobotsperformmorequicklyandreliablythanhumans.Newfirmsarepouringintothebusiness.Athirdofrobotcompaniesarelessthansixyearsoldandmakeservicerobots.Thecostsofresearchanddevelopmentarecomingdownandinvestmentisrising.WithinadecadeMr.Prattsupposesrobotsathomewillhelppeoplewithsimpletaskssuchascooking. Butforthattohappenrobotswillhavetoperformalonglistofthingstheycannotyetdo.Theycannotnavigatereliablyaroundanordinaryhomemovetheirhandsskillfullylikeahumanorconductopen﹣endedconversations.Althoughtheycanprovidesomephysicalassistancetotheelderlyonerobotcandoonlyonethingsomultipletaskswouldrequireyourhometobeequippedwithmanyrobots.Allthesesuggestthatintermsofsolvingtheproblemassociatedwithageingrobotshavealongwaytogo. 1Demandforautomationcausedbyageingexistsprobablybecauseautomation. A.keepsoutputsteadyasmorepeopleretire B.helpsageingpeoplecreatemorephysicallabor C.enablesageingpeopletolookafterthemselves D.createsamarketforageingpeople'smedicaltreatment 2AccordingtothesecondtolastparagraphMr.Prattmayagreethat. A.peopleareunwillingtoputmoremoneyinindustrialrobots B.peoplewillrelymoreonservicerobotsthanindustrialones C.robotsarebetterthanhumansatinformationprocessing D.servicerobotsaredevelopingfastinthenearfuture 3Fromthelastparagraphwecanlearnthattheauthorbelieves. A.robots'abilitytomovearoundanordinaryhomeisreliablenow B.onerobotcanalreadyperformalonglistoftasksatthesametime C.technicalproblemsinrobotsmaylimittheirwidersocialacceptance D.theneedforphysicallyhelpfulrobotsmaydecreaseifageingspeedsup 4Itcanbelearnedfromthepassagethat. A.thecostoffixingrobotsisstillhighnowadays B.robotscanhelpolderworkersstayemployedlonger C.servicerobotsaremorepracticalthanindustrialones D.human﹣likerobotscanconductopen﹣endedconversations
除去下列物质中的少量杂质所选试剂及操作都正确的是
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