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如果用螺旋测微器测一圆形工件的读数如图所示，读数为 mm．
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高三下学期物理《》真题及答案
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某同学利用螺旋测微器测量一金属板的厚度该螺旋测微器校零时的示数如图a所示测量金属板厚度时的示数如图b
写出如图所示的游标卡尺和螺旋测微器的读数1图1所示游标卡尺读数为mm2图2所示螺旋测微器读数为mm
某同学利用螺旋测微器测量一金属板的厚度该螺旋测微器校零时的示数如图a所示测量金属板厚度时的示数如图b
写出如图所示的游标卡尺和螺旋测微器的读数图1图21图1所示游标卡尺读数为mm2图2所示螺旋测微器读数
用20分度的游标卡尺测物体的长度如图甲所示读数为________m.用螺旋测微器测物体的厚度如图乙所
1在用游标为10分度的游标卡尺测某工件的尺寸时示数如图所示读数为_______cm2用螺旋测微器测量
2+2+3=7分图甲是用一主尺最小分度为1mm游标上有20个分度的游标卡尺测量一工件的长度结果如图所
用10分度的游标卡尺测物体的长度如图甲所示读数为______mm用螺旋测微器测物体的厚度如图乙所示读
图中给出的是用螺旋测微器测量一圆柱形工件的直径时的示数此读数应为mm
用螺旋测微器测量电阻丝的直径结果如图a所示则读数是mm用游标卡尺测一工件长度如图b所示则读数是mm
用游标卡尺游标尺上有50个等分刻度测定某工件的宽度时示数如图所示此工件的宽度为__________m
如图甲乙所示是螺旋测微器和游标卡尺测量工件长度时的情形螺旋测微器读数为_________mm游标卡尺
如图甲乙所示是螺旋测微器和游标卡尺测量工件长度时的情形螺旋测微器读数为_________mm游标卡尺
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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. LastFridayourschoolorganizedustoafirestationwhatwehadexpectedseveraldays.Whenwegottherethefire﹣fighterswelcomedusbutledusintoanexhibitionhall.Thereoneofthemdeliversalectureonfirecontroltous.Afterthattheyshowedushowtooperatethefireextinguisherandevengaveourchancestopracticeusingit.NowIdaresayIcanuseitskillful! Onourwayhomewecouldn'thelptotalkingaboutwhatwehadexperienced.Wefeltveryhappyandexcitingbecausewehadgainedsuchmuchknowledgeaboutfirecontrolandknownwhattodoinanemergency. Doyouhaveanythinginterestingtotellme?I'mlookingforwardtoyouremail.
Moreandmorepeoplekeeppetsnowadays.Thedogandthecatarelovablebeautifulandintelligentanimals.Adogandacatcanteachusalotabouthumannature.Morethanoneownerofadoghassaidthattheanimalunderstandseverythinghesaystoit.Soamotherorfatherwhohasevercaredforpetsislikelytobemorepatientandunderstandingwiththeirchildrenaswellandespeciallytoavoidmakingnegativeorruderemarksinthepresenceofchildrennomatterhowyoung. Acatcanteachusavaluablelessonabouthowtobecontentedhowtocalmdownateasehowtositwhereasadogcanteachuslessonsofloyaltyanddevotion.Sothere'splentytobesaidinfavorofkeepingpets.ButwithallthatinmindIstillsaylet'sstopkeepingpets.TobepracticalIamsuggestingthatifwedonotnowhaveapetweshouldnotgetonesecondifwenowhaveapetweletitbeourlastone.Icouldneversaythatpetsarebad.I'msayinglet'sgiveupthisgoodthing﹣theownershipofapet. Thepurchasethehealthcarethefeelingandhousingandtrainingofapet﹣andIchieflymeanthelargerlong﹣livedpets﹣﹣﹣costtimeandmoney.Thecaringofapetcostsfromadollaraweektoadollarormoreaday.Iwouldnotforamomentdenyitisworththat.Butthefactoutsidethewallsofourhomekeepsbreakinginonourawareness.Thoughwedonotseethepoverty﹣strickenpeopleofIndiaandAfricaandSouthAmericawecanneverquiteforgetthattheyarethere.Nowandthentheirfacesareshowninthenewsorinthebeggingadsofrelieforganization.Probablywesendadonationwheneverwecan. Themoneyandthetimewespendonpetsissimplynotourown.Doingwithoutpetsandthensendingthemoneysavedtoarelieforganizationwouldmeansavingalife﹣﹣﹣overtheyearsseveralhumanlives.Togivewhatwewouldspendonacatmightnotfeedachildbutitwouldprobablypayforhismedicalcareorbasiceducation.Thepointneedsnolongerlaboring.Thatisallthatneedstobesaid. 1WhichofthefollowingisTRUEaccordingtothepassage? A.Peopleusuallyspendsomuchmoneyonpetswithoutrewards. B.Peoplehavenomoneytosolvetheproblemofpovertyintheworld. C.Takingcareofpetscanhelpmakeourchildrenandourselveskinder. D.Theauthorcallsonthepeopletostopraisingpetsathomebecauseofdiseases. 2Howaremostpetownersdifferentfromothersaccordingtothepassage? A.Theycanbemoreloyalanddevoted. B.Theytendtobemorepatientandcaring. C.Theyseemtobecontentedandcalm. D.Theyarelikelytobebusyandindependent. 3Whatdoestheunderlinedpartthefactreferto? A.Moreandmorepeopleliketokeepdogsandcats. B.Nobodycaresaboutthepoverty﹣strickenpeople. C.Keepingpetscausesmuchwasteofmoneyandtime. D.Manypeopleoneartharestillsufferingfrompoverty. 4Whatistheauthor'sviewaboutpet﹣keeping? A.Keepingpetscanmakeusunderstandmoreabouthumanandnature. B.Keepingpetsforalongtimemakespeoplefeellackofcommunication. C.Weshouldstopkeepingpetstodonatethemoneytothepoorpeople. D.Wemustkeepallkindsofpetstoprotectmanandenvironmentproperly.
易拉罐拉环拉断后就很难打开若将A4纸对折几次后用纸的硬尖角摩擦原拉环边缘如图所示一会儿罐口就会自动冲开并看到一团“白汽”．出现这团“白汽”是因为水蒸气发生了选填“液化”或“汽化”现象．摩擦后罐口会自动冲开是因为罐内气体对罐口拉片压力增大使罐口打开．
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物理实验课上小鹏同学用如图甲所示的电路来测量标有“2.5V”字样小灯泡的电功率电源电压为4.5V不变．他从滑动变阻器接入电路阻值最大时开始记录数据测得小灯泡的I﹣U图象如图乙所示．则滑动变阻器的最大阻值为Ω滑片P向右移动过程中小灯泡L的亮度变小灯泡正常发光时的功率为W．
2018年2月6日现役世界最强大运载火箭“猎鹰重型”从美国佛罗里达州肯尼迪航天中心39A发射台腾空而起拖着熊熊尾焰直入蓝天．这预示着人类探索宇宙更近了一步．火星Mars是太阳系八大行星之一是太阳系由内往外数的第四颗行星属于类地行星直径约为地球的53%火星直径约为月球的两倍地球的一半表面重力约为地球的2/5．火星周围也笼罩着大气层与地球大气层相似．火星大气层的主要成分是二氧化碳其次是氮氩此外还有少量的氧和水蒸气．下列说法科学的是
在科学实验中常用到斜面这一简单机械请回答问题 1利用斜面研究阻力对物体运动的影响如图甲所示．小车从同一斜面的同一高度由静止开始滑下在毛巾木板平板玻璃等不同的表面上前进不同的距离后停止此过程中小车克服阻力做功．假设在毛巾木板平板玻璃表面上小车克服阻力做的功分别为W1W2W3请比较并写出它们的大小关系式． 2利用斜面探究动能大小与哪些因素有关如图乙所示．在这个实验中通过观察比较来判断小球动能的大小．要探究动能大小与物体的运动速度应该如何操作．
IamimpressedbyanincidentthathappenedduringIgnacyPaderewski'sNovember181860﹣June291941career.ThefamousPolishpianistagreedtoplayaconcertorganizedbytwoStanfordUniversitystudentsworkingtheirwaythroughschool.Paderewski'smanagersaidtheywouldhavetoguaranteetheartistafeeof﹩2000.Theboysagreedandeventuallytheconcertwasheld.Thoughthetwostudentpromotersworkedhardtheytookinonly﹩1600.DiscouragedtheytoldPaderewskioftheireffortsandhandedhimthe﹩1600withanotepromisingtopayhimthebalanceof﹩400.Buttheartisttoreupthenoteandgavethembackthe﹩1600.Takeyourexpensesoutofthishesaidgiveyourselveseach10%ofwhat'sleftforyourworkandletmehavetherest. YearslaterPaderewskiwasfacedwithfeedingthepeopleofhiswar﹣ravagedPoland.AmazinglyevenbeforearequestwasmadethousandsoftonsoffoodweresenttoPolandbytheUnitedStates. PaderewskilatertraveledtoParistothankHerbertHooverwhoheadeduptheUSreliefeffort.That'sallrightMr.PaderewskisaidHooverIknewthattheneedwasgreat.AndbesidesthoughyoumaynotrememberitIwasoneoftwocollegestudentswhomyougenerouslyhelpedwhenIwasinneed. Thestoryillustratesalawofsuccessfullivingsoonerorlaterwewillreapwhatwesow.Paderewskireapedaharvestofkindnesshehadsownyearsbefore.Thosewhosowlovewilleventuallyreaplove.Thosewhosowgoodnesswillreapevenmore.Thosewhosowfearandmistrustwillreapanunwantedharvestlater.It'sabasiclawofsuccessfulliving.Andpowerfulenoughtochangealife. 1Thetwostudentsorganizedtheconcertto. A.raisemoneyforthepeopleinneed B.showtheirinterestinmusic C.earnmoneyfortheirstudy D.workfortheirschool 2Thatthetwostudentspromisedtopaytheartisttherestmoneyshowsthatthey. A.kepttheirwords B.wereforcedtodothis C.wantedtogettheartist'ssympathy D.knewtheywouldpaytheartistontime 3WhydidPaderewskigetthousandsoftonsoffood? A.Becauseheoncedonatedfoodtoothers. B.Becausehegaveothershelpwhentheywereinneed. C.Becausehemadearequest. D.Becausehiscountryhadagoodrelationshipwithothers. 4Thepurposeofwritingthepassagemaybeto. A.tellusastorybetweenthetwostudentsandanartist B.showusthattheartistwasagoodperson C.fightagainstthebadpeople D.callonustoshowkindnessandlove
如图所示用10N的力F沿水平方向拉滑轮可使物体A以0.2m/s的速度在水平面上匀速运动．弹簧测力计的示数恒为2N不计滑轮测力计绳子的重力滑轮的转轴光滑．下列说法正确的是
小乐利用长宽和厚度均相同的锌片铁片与铜片完成了以下实验 利用锌片和铜片制作电池 1小乐从课本中得知将一块锌片和一块铜片插入稀硫酸就可以组成一个电池铜片和锌片是电池的两个电极且溶液中部分离子移动的方向和电极上电子移动的方向如图乙所示．此电池的能量转化是若要用电压表测此电池的电压则电压表的负接线柱应与相连选填“铜片”或“锌片” 2小乐从课本中还知道若在水果中插入锌片和铜片可以制得水果电池于是她完成了如下实验 通过上述实验可知水果电池电压大小的影响因素有．
实验室常用电流表的结构如图所示线圈与接线柱相连．当通以图示方向的电流时线圈带动指针向右偏转．下列说法中正确的是
CityCollegeUnionCompany Secretary/Typist TheUnionisastudent﹣runorganizationwithapermanentstaffof20.Typingspeedatleast60wpm. Theabilitytotakeshorthanddictationandaworkingknowledgeoffillingproceduresareessentialrequirements. Thebasicsalaryforthepositionis﹩18500peryear. EnquirestoR.Barbar387﹣5075. EmuAirline Secretary EmuAirlineisnowofferingapart﹣timepositionforasecretary. Thepositionoffersatleast20hours'workaweekwithaviewtofull﹣timeworkinthefuture.Monthlysalaryisabout﹩1400. Phone899﹣3264foranappointment. WordProcessor Operatorfull﹣time Weneedanoperatortoworkinanofficeassociatedwiththebuildingindustry.Onlyexperiencedoperatorsareexpectedtoapply. Startingsalary﹩17950yearly. ApplyinwritingtothePersonnelOfficerHillMorganPtyLtd38GreenHillRd. SewingMachinistWanted JeansIndustry Weareanexpandingclothingcompanylocatedsouthofthecity.Ourproductsincludejeansskirtsshortsandsoon.Wearelookingforsewingmachineoperators. Thefactoryworksa38﹣hourweekover4﹣5days.Wagesforthisare﹩18050peryear.IfyouareinterestedcomeoverandpickupanapplicationformfromRipperJeans23NorthAveBeaudesert. 1Whatdothesefouradvertisementshaveincommon? A.Eachofthemiscommentedbytheirmanager. B.Theyarelocatedinthesouthofthesamecity. C.Theircompaniesareintroducedindetail. D.Theyallwantpeopleintheproperposition. 2TheapplicantsforthepostofasecretaryinCityCollegeUnionCompanyshouldhavethefollowingqualitiesEXCEPT. A.abilityoforganization. B.knowledgeaboutfillingtheform. C.typingskill. D.writingrapidly. 3TheattractivenessofthepostinEmuAirlineis. A.itspromisingfuture. B.itsfreeflying. C.itsgoodsalary. D.itsniceworkingconditions. 4Ifyouwanttobeasewingmachineoperatoryoumaycontactthiscompanyby. A.visit. B.fax. C.phone. D.email.
如图所示的是小兰家的电能表．此时电能表的示数是kW•h．
下列相关的量之间的关系符合如图所示图线的是
清晨小梅吃早餐时用自来水冷却刚煮熟的鸡蛋．若用水的质量是0.5kg水温升高了5℃这些水吸收的热量是J．小梅将冷却好的鸡蛋在餐桌上用力一磕蛋壳就破了这说明力可以改变物体的．[水的比热容c＝4.2×103J/kg•℃]
如图台秤的托盘上一个装有水的烧杯一个不吸水的木块下面用细线悬挂一个实心铁球木块仍浮在水面上．下列各种说法中正确的是
如图圆柱形盛水容器横截面积为S1．重力为G的柱形金属块横截面积为S2已知S1＞S2金属块用细线悬挂并使之底面恰好与水面齐平．现将金属块缓慢下降浸入水中设水均不溢出且金属块不浸没水的密度为ρ则 1金属块底面在水中深度为h时金属块所受浮力为多少 2金属块相对容器底部下降高度为H时盛水容器底部增大的压强是多少
玻璃板下面垫着一张报纸玻璃板上滴一滴水透过水滴看报纸上的字看到的是字的
在水平桌面上竖直放置一个底面积为S的圆柱形容器内装密度为ρ1的液体．将挂在弹簧测力计下体积为V的金属浸没在该液体中液体未溢出．物体静止时弹簧测力计示数为F撤去弹簧测力计球下沉并静止于容器底部此时液体对容器底的压力为容器底对金属球的支持力的n倍．求 1金属球的密度 2圆柱形容器内液体的质量．
请用笔画线代替导线将图中带拉线开关的电灯正确接入家庭电路中．
小蕾同学的实验小组在探究“电流产生热量的多少与哪些因素有关”时使用了如图甲所示的实验装置烧瓶A内装有一定质量的煤油． 1连接实验电路时同组的小超问小蕾“打开实验室里的水龙头就可以接到水了为什们还要用煤油呢”小蕾对他说“因为煤油的比水的小方便观察温度计示数的变化．” 2在闭合开关前他们应将滑动变阻器的滑片P移到最选填“左”或“右”端． 3小蕾将滑片P移动到某一位置闭合开关10s后断开开关．在这段时间他们观察到温度计的示数逐渐升高．这个实验现象说明电流通过导体产生热量的多少与有关． 4接着小蕾又将滑片P向左移动到某一位置闭合开关10s后断开开关．他们观察到这一次温度计的示数比上一次实验时的示数还要高．两次实验对比他们能得出的结论是电流通过导体产生热量的多少还与有关． 5完成上述实验后同组的小磊想到家中的电热烤火器工作时烤火器热得烫手但连接烤火器的导线却不怎么热．他猜想电流通过导体产生热量的多少可能还与电阻的大小有关．于是他们准备了两个完全相同的烧瓶烧瓶內装有质量相等初温相同的煤油并将两段长度横截面积相同但材料不同的电阻丝浸没在煤油中再用带有规格完全相同的温度计的橡胶塞封住瓶口如图乙所示． ①图乙中两段电阻丝的连接方式是． ②闭合开关后他们观察到A烧瓶中的温度计示数逐渐升高B烧瓶中的温度计示数不变．出现这种现象的原因可能是B烧瓶中的电阻丝． ③他们排除故障闭合开关一段时间后观察到选填“A”或“B”烧瓶内温度计的示数较高．由此可知小磊的猜想是选填“正确”或“错误”的．他们通过分析本次实验现象得出了“在电流大小和通电时间相同时电阻越大电流通过导体产生的热量越多”的结论．
如图所示的是一个家用普通茶壶．茶壶壶嘴的高度不低于壶身的高度其设计遵循了的原理．茶壶盖上的“小孔”可以使壶内外的相等从而使壶内的茶水容易从壶嘴倒出．
一般大型超市出口处都装有报警器一般是由防盗天线检测门检测器构成．使用时只要在商品上贴上具有磁性的软标签即可达到保护商品的目的．正常购买时营业员在结帐后会将具有磁性的软标签消磁如果商品的软标签未经消磁当经过检测通道后检测天线便检测到商品上的标签信号从而转化为电信号发出报警声及时提醒保安人员从而达到防盗目的．根据上述信息可以判断报警器的原理与下列哪个实验相同
Ittakesplentyoftimeforsomeadultstotrytostopchildrenplaying.Theyareusuallypeoplewhothinkofplayasbeingthe1ofworkandthereforeawasteoftime.Forhumansworkisawayofgettingfoodtoeatandlikehumans2mustspendtimedoingthe3things.Regardlessofthischildren4playingandsodootheryounganimals.Itisquite5tokeepbothasmallchildandayoungcat6forhourswithapieceofpaper. Huntingmaybethemostobviousskill7inplaybutitisfarfrombeingtheonlyone.Lambsandgoatkidsplay8althoughasadultstheywillnever9anythingotherthansomegrass.Butfortheseyounganimalstoo10isanimportantpartoflearning.Sheepandgoatsare11hillandmountainanimals.Runningandskippingexerciseyounglegsanddevelopastrongsenseof12thatwillkeepthemsafeonthesteepestrocks. 13animals'playchildren'splayisnotsodifferent.14treesandcatchingfliesarenotthemostobvioustrainingfortheadultworldbuttheflexibility15intheseactivitiesissimilartothatrequiredofabusdriverorbusinessman. Whatweknowaboutanimalsshowsusthatplayingisaverygoodwayof16somaybeoneofthebestwaysfor17tolearnisalsobyplaying.Childrenfindplayingisfunbut18noticethattheyarealsolearningatthesametime.Mostpeoplecontinuetoplaygameslongaftertheyhavebecome19andperhapsthatisbecausewerelysomuchonour20tolearn. 1A.reward B.basis C.nature D.opposite 2A.children B.animals C.parents D.cats 3A.dull B.ordinary C.same D.chief 4A.enjoy B.regret C.delay D.ignore 5A.necessary B.possible C.reasonable D.difficult 6A.annoyed B.alarmed C.amused D.amazed 7A.practiced B.kept C.tested D.required 8A.clumsily B.endlessly C.crazily D.aggressively 9A.catch B.plant C.learn D.hunt 10A.play B.work C.jump D.walk 11A.naturally B.initially C.strangely D.equally 12A.direction B.balance C.distance D.space 13A.Basedon B.Inspiredby C.Comparedwith D.Developedform 14A.Cutting B.Growing C.Watering D.Climbing 15A.reduced B.needed C.damaged D.allowed 16A.growing B.exercising C.improving D.learning 17A.humans B.creatures C.adults D.students 18A.generally B.possibility C.hardly D.truly 19A.strong B.wise C.athletic D.mature 20A.flexibility B.liberty C.curiosity D.responsibility
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