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具备基本的化学实验技能是学习化学和进行探究活动的基础和保证． （1）教案备课库实验室常用于量度液体体积的仪器是 ； （2）给试管内液体加热时所盛液体体积不得超过试管容积的 ； （3）过滤...
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具备基本的化学实验技能是进行科学探究的基础和保证下列操作正确的是
用过氧化氢制取氧气
倾倒液体
取用液体
过滤
具备基本的化学实验技能是学习化学和进行探究活动的基础和保证1实验室常用于量度液体体积的仪器是____
具备基本的化学实验技能是学习化学和进行化学探究活动的基础和保证．只有掌握化学实验的基本技能才能安全
具备基本的化学实验技能是进行科学探究活动的基础和保证下列图示的化学实验基本操作中正确的是
倾倒液体
称量固体
检验气密性
加热液体 。
具备基本的化学实验技能是进行科学探究活动的基础和保证．下列实验操作中正确的是
用药匙取用粉末状药品
将实验剩余的药品带出实验室
用嘴吹灭酒精灯
将称量物放在天平的右盘进行称量
科学探究是学生积极主动地获取化学知识认识和解决化学问题的重要实践活动教案备课库对科学探究主题的内容和学
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①③④
①②④
①②③
义务教育化学课程标准2011年版在知识与技能过程与方法情感·态度·价值观三个方面对中学化学课程目标进
认识科学探究的意义和基本过程，能进行简单的探究活动，增进对科学探究的体验
初步形成基本的化学实验技能，初步学会设计实验方案，并能完成一些简单的化学实验
能用变化和联系的观点分析常见的化学现象，说明并解释一些简单的化学问题
保持和增强对生活和自然界中化学现象的好奇心和探究欲望，发展学习化学的必趣
具备基本的化学实验技能是进行科学探究的基础和保证下列有关实验操作正确的是
给液体加热
转移溶液
称取NaOH固体
量取液体
具备基本的化学实验技能是学习化学和进行化学探究活动的基础和保证．只有掌握化学实验的基本技能才能安全准
具备基本的化学实验技能是进行科学探究的基础和保证下列操作正确的是
用H
2
O制O
2
倾倒液体
取用液体
过滤
学生具备基本的化学实验技能是进行科学探究活动的基础和保证下列实验操作错误的是
倾倒液体药品时，试剂瓶上的标签向着手心
过滤时，漏斗的下端紧贴烧杯的内壁
将称量物放在托盘天平的右盘上称量
如果不慎将氢氧化钠粘在皮肤上，立即用大量的水冲洗，然后涂上硼酸溶液
具备基本的化学实验技能是进行科学探究活动的基础和保证下列有关实验操作错误的是
倾倒液体
装入固体粉末
加热液体
读取液体体积
义务教育化学课程标准2011年版指出化学实验是进行科学探究的重要方式学生具备基本的化学实验技能是学习
具备基本的化学实验技能是进行科学探究活动的基础和保证下列图示的化学实验基本操作中正确的是▲
倾倒液体
称量固体
检验气密性
加热液体
具备基本的化学实验技能是进行科学探究活动的基础和保证下列有关实验操作错误的是
倾倒液体
装入固体粉末
加热液体
读取液体体积
具备基本的化学实验技能是进行科学探究活动的基础和保证下列实验操作正确的事
用嘴吹灭酒精灯
将实验剩余的药品放回原试剂瓶
取用较大块状固体药品用镊子
把鼻孔凑近瓶口闻药品的气味
具备基本的化学实验技能是进行科学探究活动的基础和保证下列有关实验操作错误的是
倾倒液体
装入固体粉末
加热液体
读取液体体积
具备基本的化学实验技能是进行化学探究活动的基础和保证同时也反映了实验者的化学学科素养以下实验操作正确
具备基本的化学实验技能是进行科学探究活动的基础和保证．下列实验操作正确的是
化学实验技能是学习化学和进行探究活动的基础和保证.应酒精灯加热时应该使用酒精灯的焰加热用试管夹夹持试
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海域夏天常会出现海市蜃楼奇观这是由于光在大气中的折射和全反射使远处物体在空中形成的A．正立虚像 B．倒立虚像 C．正立实像 D．倒立实像
Shehasa安排allherbusinessaffairsbeforegoingonholiday.
如图所示半圆形玻璃砖置于光屏PQ的左下方．一束白光沿半径方向从A点射入玻璃砖在O点发生反射和折射折射光在光屏上呈现七色光带．若入射点由A沿圆弧向B缓慢移动并保持白光沿半径方向入射到O点观察到各色光在光屏上陆续消失．则反射光的强度变化以及光屏上最后消失的光分别是A．减弱紫光 B．减弱红光 C．增强紫光 D．增强红光
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Hereyestoldhimthatshewassatisfiedwithhim.A.truthful B.truth C.truthfully D.true
I'mlookingafterTomtoday.He'sbeeninmyhouse8:00thismorning.A.at B.for C.since D.till
在用双缝干涉测光的波长的实验中准备了下列仪器A．白炽灯 B．双窄缝片 C．单窄缝片 D．滤光片 E．毛玻璃光屏1把以上仪器安装在光具座上自光源起合理的顺序是填字母序号2在某次实验中用某种单色光通过双缝在光屏上得到明暗相间的干涉条纹其中亮纹ac的位置利用测量头上的分划板确定如图所示其中表示a纹位置图甲的手轮读数为mmc纹位置图乙的手轮读数为mm3已知双缝间的距离为0.18mm双缝与屏的距离为500mm则单色光的波长为μm．
Almostallscientistsfailedmanytimesbeforetheyfinallysucceeded.Intheirscientificworktheywereallstrict41themselves.Whentheyfirst42theirideastheywerealwaysrejected.43theydidnotgiveup.Itwastheirperseverance44madethemsuccessful. A45theoryistheresultofthescientificmethod.Scientistslookattheworldandtrytodescribeandexplainwhattheysee.Firsttheycarefullyobservewhattheyare46in.Toexplainwhattheyhaveseentheybuildatheoryabouttheway47thingshappenandthecausesandeffects.Thentheywere48intheirwork.Finallythescientiststestthetheorytoseeifitmatcheswhattheyhaveseenandifitcan49futureevents. Infacteverynewthoughtorideahastobe50towhatwealreadyknew.Greatthinkersorscientistsareawareofthisandtryto51newandoldideasin52manydifferentwaysaspossible.Someofthegreatestscientistsforcedthemselvestodevelopnewideasevenwhentheytiredordidnotfeel53.Theyallknewthatforeachnewideathatworksthereare54tenthatdonot. Ifwewanttodevelopou55wecantryusingsomeofthe56strategies策略ofthegreatandfamous.Wemaynotbeinterestedinbecomingscientistsbutweprobablyallwanttofindnewwaystoimproveour57.58knowsperhapsyournextthoughtwillbeanewideathatchangestheworld?Soweshouldbewellpreparedtomeet59inlifenowandtryourbesttomakegreat60toourfuturesociety. 41.A.in B.on C.with D.for 42.A.putup B.puton C.putaside D.putforward 43.A.So B.Therefore C.However D.But 44.A.that B.what C.which D.whether 45.A.scientific B.certain C.sure D.expert 46.A.curious B.interested C.cautious D.characteristic 47.A.which B.inwhich C.where D.How 48.A.absorbed B.absorbing C.absorb D.toabsorb 49.A.see B.watch C.notice D.foresee 50.A.linking B.link C.linked D.tolink 51.A.construct B.expose C.analyse D.combine 52.A.as B.than C.so D.such 53.A.inspiring B.inspired C.responsible D.enthusiasm 54.A.atmost B.atlast C.atleast D.intheleast 55.A.creativity B.conclusion C.enquiry D.chart 56.A.think B.thought C.thinking D.thoughts 57.A.life B.level C.universe D.sense 58.A.Who B.What C.How D.Which 59.A.suspect B.challenges C.clue D.announcement 60.A.contributions B.contribution C.contribute D.construction
2017年·北京市顺义区二模下列说法正确的是
我们决定每个人都卖掉我们不再使用的五件东西.Wehavedecidedto fivethings .
如图所示的容器中盛有含碘的二硫化碳溶液在太阳光的照射下地面呈现的是圆形黑影在黑影中放一支温度计可发现温度计显示的温度明显上升则由此可判定
Withoutproperplanningtourismcancauseproblems.Forexampletoomanytouristscancrowdpublicplacesthatarealsoenjoyedbytheinhabitants居民ofacountry.Iftouristscreatetoomuchtraffictheinhabitantsbecomeannoyedandunhappy.Theybegantodisliketouristsandtotreatthemimpolitely.Theyforgethowmuchtourismcanhelpthecountry'seconomy.Itisimportanttothinkaboutthepeopleofadestinationcountryandhowtourismaffectsthem.Tourismshouldhelpacountrykeepthecustomsandbeautythatattracttourists.Tourismshouldalsoadvancethewealthandhappinessoflocalinhabitants. Toomuchtourismcanbeaproblem.Iftourismgrowstooquicklypeoplemustleaveotherjobstoworkinthetourismindustry.Thismeansthatotherpartsofthecountry'seconomycansuffer. Ontheotherhandifthereisnotenoughtourismpeoplecanlosejobs.Businesscanalsolosemoney.Itcostsagreatdealofmoneytobuildlargehotelsairportsairterminalsfirst﹣classroadsandothersupportfacilitiesneededbytouristattractions.Forexampleamajorinternationalclasstourismhotelcancostasmuchas50thousanddollarsperroomtobuild.Ifthisroomisnotusedmostofthetimetheownerofthehotellosemoney. Buildingahotelisjustabeginning.Theremustbemanysupportfacilitiesaswellincludingroadstogettothehotelelectricitysewerstohandlewasteandwater.Allofthesesupportfacilitiescostmoney.Iftheyarenotusedbecausetherearenotenoughtouristsjobsandmoneyarelost. 33.ToomuchtourismcancausealltheseproblemsEXCEPT. A.abadeffectonotherindustries B.achangeoftourists'customs C.over﹣crowdednessofplacesofinterest D.pressureontraffic 34.Itcanbeinferredfromthetextthat. A.theauthordoesn'tliketourismdevelopingsofast B.localpeoplewillbenefitfromtouristattractions C.otherpartsofacountry'seconomywon'tbenefitfromtourismmuch D.wecan'tbuildtoomanysupportfacilities 35.Theauthorthinksitisgoodforlocalpeopletoknowthattourismwill. A.wastealotofmoney B.weakentheireconomy C.helpestablishtheircustoms D.helpimprovetheirlife.
EdwinHubblemadehismostimportantdiscoveriesinthe1920s.Todayotherastronomerscontinuetheworkhebegan.ManyofthemareusingtheHubbleSpaceTelescopethatisnamedafterhim. EdwinPowellHubblewasbornin1889inMarshfieldMissouri.HespenthisearlyyearsinthestateofKentucky.ThenhemovedwithhisfamilytoChicagoinLouisville.HeattendedtheUniversityofChicago.Hestudiedmathematicsandastronomy天文学.Hubblewasagoodstudent.Hewasagoodathletetoo.HewasamemberoftheUniversityofChicagochampionshipbasketballteamin1909.Healsowasanexcellentboxer.Severalpeopleurgedhimtotrainfortheworldheavyweightboxingchampionshipaftercollege.Insteadhedecidedtocontinuehisstudies.HewenttoQueen'sCollegeatOxfordEngland. AtOxfordHubblestudiedlaw.HewasinterestedinBritishCommonLawbecausehisfamilyhadcometoAmericafromEnglandmanyyearsbefore.HespentthreeyearsatOxford.In1913HubblereturnedtotheUnitedStates.HeopenedalawofficeinLouisvilleKentucky.Afterashorttimehoweverhedecidedhedidnotwanttobealawyer.HereturnedtotheUniversityofChicago.Thereonceagainhestudiedastronomy.EdwinHubblewasthefirstpersontousetheHaleTelescopeHediedin1953whilepreparingtospendfournightslookingthroughthetelescopeatthesky. Hubble'sworkledtoanewresearchonthebirthoftheuniverse.Oneastronomersaidscientistshavebeenfillinginthedetailseversince.Andhesaidtherewasalongwaytogo. 21.Whatwouldbethebesttitleforthispassage? A.EdwinHubble'sLife B.EdwinHubble'sDiscoveries C.TheHubbleSpaceTelescope D.EdwinHubble﹣AFamousLawyer 22.AccordingtothispassageEdwinHubblewasmost.interestedin. A.sports B.law C.astronomy D.mathematics 23.WhichofthefollowingshowstheRIGHTorderaccordingtothispassage? a.HejoinedtheUniversityofChicagochampionshipbasketballteam. b.HestudiedastronomyattheUniversityofChicagoonceagain. c.HemovedtoLouisvillewithhisfamily. d.HeusedtheHaleTelescopetolookatthesky. e.HebecamealawyerinLouisvilleforashortperiodoftime. A.cabde B.ac.bed C.c.aebd D.abdec 24.Fromthispassageweknowthat. A.theHubbleSpaceTelescopewasmadebyHubblehimself B.EdwinPowellHubblewenttoOxfordEnglandin1910 C.EdwinPowellHubblegrewupinMarshfieldMissouri D.Hubblediedwhilehewaslookingatthesky.
光导纤维是利用全反射传导信号的装置如图所示为一光导纤维AB为其一端面．纤维内芯材料的折射率n1=1.3外层材料的折射率n2=1.2在如图所示的情况下试求入射角i在什么范围内的光线都可在此纤维内传递．
Mikewassoainhisbookthathedidn'tevennoticemecomein.
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短文.短文中共有10处错误每句中最多有两处.错误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∧并在此符号下面写出该加的词. 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. Ilikeridingmybike.Thoughitisnotverynewbutitismybestfriend.Ifindveryconvenienttogoanywherewithabike.Ridegivesmenotonlyexercisebutalsopleasure.Iusemybikemostlyonsummerwhentheweatheriswarmanddry.Itcanveryunpleasantinwinterwhenitiscoldandrainispouringdown.Itcanalsobeverydanger.OfcourseIwillbeverycarefulonmybike.Infactsaccidentsarenottheonlyproblem.OnedayIwenttoschoolandcomebacktofindhisfrontwheelwasmissing.Itwasalongwalktotherepairershop.NowIhavetwostronglocks.
尽管我的女儿对失去某些玩具也感到伤心但是她更通情达理.Mydaughterwas althoughshealsofeltsad certaintoys.
Heansweredallthequestionstruthful.
HehasbeenstudyingEnglishwhenhewaseightyearsold.
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California'sRedwoodNationalPark Standinthemiddleofthevastredwoodforestsandyoumayfeellikeyouhavesteppedbackintime.It'shardnottobeamazedwhenyou'restaringatEarth'stallestlivingthings.Andthatfeelingcontinueseverywhereinthepark.Whetherwalkingalongthebeachesorhikinginthewoodsvisitorsareinaweofthenaturalsurroundingsvariouswildlifeandquietpeace. ●History: Old﹣growthredwoodforestsusedtocovermorethan2000000acresoftheCaliforniacoast.Atthattimeabout1850NativeAmericanslivedinthenorthernareauntillumbermen伐木工人discoveredit.Manytreeswerecutdown.In1918theSave﹣the﹣RedwoodsLeaguewasformedinanefforttoprotecttheareaandby1920manystateparksweresetup.RedwoodNationalParkwascreatedin1968eventhoughabout90%oftheoriginalredwoodtreeshadalreadybeencutdown. ●WhentoVisit: Summersarewarm.Itisthebusiesttimeoftheyear.Wintersarecoolandprovideadifferentkindofvisit.Ifyouenjoybird﹣watchingplanyourvisitduringthespring.Youmayalsowanttoconsideravisitduringthefalltocatchtheamazingfallenleaves.. ●GettingThere: ForthosedrivingintotheparkyouwilluseU.S.Highway101whetheryouaretravelingfromthenorthorsouth.IfyouaretravelingfromthenortheasttakeU.S.Highway199fromSouthForkRoadtoHowlandHillRoad. ●Fees/Permits: Oneofthebestthingsaboutthisnationalparkisit'sfreetovisit!That'sright!ThereisnoentrancefeeforRedwoodNationalPark.Howeverifyouplanoncampingintheparkfeesandreservations预约arerequired.Call800﹣444﹣7275formoreinformation. 25.TheunderlinedpartinaweofinParagraph1probablydescribesafeelingof. A.sadness B.loneliness C.amazement D.satisfaction 26.WhenRedwoodNationalParkwascreatedin1968. A.peoplebegantorealizethevalueofredwoods B.therewerefewold﹣growthredwoodslet C.old﹣growthredwoodforestscametolight D.NativeAmericansstilllivedinthearea 27.WhatcanwelearnaboutRedwoodNationalPark? A.Itisag7eatplacetovisitanytimeoftheyear. B.Thereisonlyonehighwayleadingtothepark. C.Visitorscancampintheparkforfree. D.ItisthefirststateparkintheUSA. 28.Thetextismostprobablytakenfrom. A.atravelguide B.ahistorypaper C.anewspaperreport D.ageographytextbook.
电磁波已广泛运用于很多领域．下列关于电磁波的说法符合实际的是A．电磁波不能产生衍射现象B．常用的遥控器通过发出紫外线脉冲信号来遥控电视机C．根据多普勒效应可以判断遥远天体相对于地球的运动速度D．电磁波是横波
太阳光通过三棱镜时在竖直放置的屏幕上形成如图所示的光带NP忽略三棱镜对各色光的吸收．若将灵敏温度计的测温端放在屏幕上的MNNPPQ区域时在哪个区域上升的示数最大
—Itseemsthatyouareinterestedinthisnovel.—Yeah.IitasoneofthebestnovelsI'veeverread.A. regard B. think C. look D. say
下列说法中正确的是A．雷达发射的电磁波是由均匀变化的电场或磁场产生的B．声源与观察者相互靠近时观察者所接收的频率大于声源振动的频率C．电磁波和声波一样在介质中的传播速度只与介质本身有关与频率无关D．在光的双缝干涉实验中若仅将入射光由绿光变为红光则条纹间距变宽
Johnwassolazythathestayedhomeandwatchedtelevisionalldayinsteadofworking.Onedayhis1sawaHelpwantedadinthesupermarketwindow.Thesupermarketneeded2toputthingsontheshelves.Shetoldthemanagerthatherhusbanddidn'thaveajobbuthewasvery3.ShetoldhimthatJohnwouldcometoapplyfor申请thejob.4shegothomeandtoldJohnaboutthejobhewasjustwatchingtelevisionattentively.Itmadehersoangrythatshe5theTVandorderedhimtogoandseethemanagerofthesupermarket.Johndidn'twanthiswifetobeangry.Sohewent.OnthewayJohnthoughtifthemanager6himthejobhewouldn'tbeabletostayhomeandwatchtelevisionalldaylong.Hewouldhaveto7inthesupermarketeveryday.Thenhehad8.Hedecidedtotellthemanagerthatsomethingwaswrongwithhisshouldersohe9notraisehisarmabovehishead.Hewas10themanagerwouldn'tgivehimthejob.Whenhearrivedatthesupermarkethetoldthemanagerthatheneededthejob.Areyoustrong?themanagerasked.Johnexplainedthathecouldn'traisehis11abovehishead.Johntoldhimthathe12anaccidentathomewhiledigginginthegarden.How13canyouraiseyourarm?themanagerasked.Johnliftedhisarm14 Onlythishighhesaid.Andhowhighcouldyouraiseit15theaccident?askedthemanager.Thishigh.saidJohn.Andheliftedhisarmabovehishead. 1.A.wife B. daughter C. neighbor D.mother2.A.everyone B.someone C.none D.noone 3.A.busy B. old C. strong D.weak 4.A.Unless B. Because C. Before D.When 5.A.gaveoff B. putup C. turnedoff D.turnedon 6.A.sent B. offered C. told D.called 7.A.play B.rest C.work D.shop 8.A.anidea B. aquestion C. alesson D.anorder 9.A.may B. should C. must D.could 10.A.sorry B. sure C. afraid D.shy 11.A.arm B. leg C. foot D. shoulder 12.A.had B. took C. happened D.got 13.A.low B.high C.farD.long 14.A.agreatdeal B.veryhigh C. alittle D.alot 15.A.before B.after C.ifD.though
间谍卫星上装有某种遥感照相机可用来探测军用目标这种照相机能拍到晚上关灯行驶的汽车甚至车已经离开也瞒不过它这种遥感照相机敏感的电磁波属于
关于电磁波下列说法正确的是A．变化的电场周围产生变化的磁场变化的磁场周围产生变化的电场两者相互联系统称电磁场B．电磁波谱中最难发生衍射的是无线电波C．电磁波穿过两种介质的分界面时频率不会发生改变D．电磁波在同种介质中只能沿直线传播
你会怎样处理你筹集的钱呢?Whatwouldyou themoney
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