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(1分)They have leading experts in this field, and that's they've made important progress.( ) A...
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高三下学期英语《》真题及答案
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某同学在风速为5m/s的东风天气中匀速直线奔跑时他感觉到无风则他在向方奔跑若以地面为参照物则他奔跑的速度为．
按照图1所示的电路图电流表都使用小量程将图2中各元件连接起来．用笔画线表示导线导线不许交叉
以下实例中为了减小摩擦的是
如图所示用20N的压力F将重5N的物体压在墙上时物体恰好竖直向下匀速运动此时该物体受到墙壁给它的摩擦力大小为N若把压力F减小该物体与墙壁之间的摩擦力将选填“变大”“变小”或“不变”．
一物体放在距凸透镜20cm处时在另一侧距凸透镜14cm处的光屏上出现了一个清晰的像．那么该透镜的焦距可能是
2.5分在如图所示电路中电源电压保持不变．闭合开关S将滑动变阻器的滑片P向左移动下列说法中正确的是
2.5分如图所示的家用电器中利用电动机原理工作的是
电能表表盘上标有“3000R/kW•h”的字样将某用电器单独接在该电能表上正常工作30min电能表转盘转动了300转则该用电器在这段时间内消耗的电能是kW•h该用电器的功率是W这个用电器可能是填“电水壶”“空调”或“电视机”．
Sharkattacksnotonlydisturbbeachactivitiesbutcanaffectassociatedtouristindustries.Sharknetsareacommonsolutiontopreventingsharkattacksonbeachesbuttheycausedangerstoseaecosystems. Seekingacost﹣effectivewaytomonitorbeachsafetyoverlargeareaswehavedevelopedasystemcalledSharkSpotter.ItcombinesartificialintelligenceAIcomputingpoweranddrone无人机technologytoidentifyandwarnlifesaverstosharksnearswimmers.TheprojectisacooperationbetweentheUniversityofTechnologySydneyandTheRipperGroupwhichispioneeringtheuseofdrones﹣calledWestpacLittleRipperLifesavers﹣inthesearchandrescuemovementinAustralia. SharkSpottercandetectsharksandotherpotentialthreatsusingreal﹣timeaerialimagery.Thesystemanalysesvideofromacameraattachedtoadronetomonitorbeachesforsharkssendwarningsandconductrescues.DevelopedwithtechniquesknownasdeeplearningtheSharkSpottersystemreceivesimageryfromthedronecameraandattemptstoidentifyallobjectsinthescene.Oncecertainobjectsaredetectedtheyareputintooneof16categories:sharkwhaledolphinraysdifferenttypesofboatssurfersandswimmers. IfasharkisdetectedSharkSpotterprovidesbothavisualsignonthecomputerscreenandanaudiblewarningtotheoperator.TheoperatorconfirmsthewarningandsendstextmessagesfromtheSharkSpottersystemtotheSurfLifeSaversforfurtheraction.Inanemergencythedroneisequippedwithalifesavingflotationpod漂浮仓togetherwithanelectronicsharkrepellent驱逐装置thatcanbedroppedintothewaterincaseswhereswimmersareinseveretroubletrappedinariporiftherearesharkscloseby. InJanuary2018theWestpacLittleRipperLifesaverswasusedtorescuetwoyoungswimmerscaughtinaripatLennoxHeadNSW.Thedroneflewdownthebeachsome800metersfromthelifeguardstationandalifesavingflotationpodwasdroppedfromthedrone.Thecompleterescueoperationtook70seconds. WebelieveSharkSpotterisawin﹣winforbothmarinelifeandbeachgoers.ThisuniquetechnologycombinesdynamicvideoimageprocessingAIandadvanceddronetechnologytocreativelydealwiththeglobalchallengeofensuringsafebeachesprotectingenvironmentsandpromotingtourism. 1ASharkSpotteris. A.asolutiontomonitorsharks B.anequipmenttoidentifylifesavers C.atechnologytopreventsharkattacks D.aprojecttopioneertheuseofdrones 2Whenasharkisspottednearaswimmerthesystemwill. A.taketimelyaction B.analyzethevisualdata C.classifytheidentifiedobjects D.turnondeeplearningmode 3Theexampleinthe5thparagraphshowsusthatthesystemis. A.efficientinsavinglives B.effectiveindetectingsharks C.smartindrivingsharksaway D.practicaloverthewholeseaarea 4Whatistheauthor'sattitudetowardsthefutureofSharkSpotter? A.Doubtful. B.Optimistic. C.Negative. D.Objective.
2.5分关于声现象下列说法中正确的是
2.5分下列有关运动和力的描述或解释正确的是
如图中AOB是可绕O点无摩擦转动的轻杆A端挂重300N的物块AO与OB长度之比为54．人始终沿竖直方向拉挂在B端的轻环此时杠杆是选填“省力”或“费力”的．为了防止人被拉起人的体重至少为N．与在水平位置平衡相比当轻杆在图中虚线位置平衡时人的拉力将选填“变大”“变小”或“不变”．
在“用伏安法测小灯泡电阻”的实验中待测小灯泡额定电压为2.5V． 1请用笔画线代替导线将如图甲所示的实验电路未连接部分连接好连线不得交叉．闭合开关前滑动变阻器的滑片应置于选填“a”或“b”端． 2同学们移动滑动变阻器的滑片记录多组小灯泡两端不同的电压及对应的通过小灯泡的电流值根据这些数据在坐标纸上绘制出了通过小灯泡的电流随其两端电压变化关系的图象如图乙所示．分析图象可知小灯泡正常工作时的灯丝电阻为Ω． 3从图象还可以看出小灯泡灯丝的电阻随电压的增大逐渐选填“变大”或“变小”从物理学角度分析造成这一现象的原因是． 4实验中测出了小灯泡在多次不同电压下的灯丝电阻有些同学认为可以进一步求出它们的平均值以减小误差．他们的观点是的选填正确或错误． 5该实验的整套装置还可以用于测小灯泡的．
2.5分某物体在平衡力的作用下做匀速直线运动．若它所受的平衡力突然全部消失则物体将
2.5分如图所示电源两端电压保持12V不变小灯泡L上标有“6V3W”字样滑动变阻器最大电阻值R＝60Ω．不考虑灯丝电阻随温度的变化下列说法正确的是
Thesedayseveryoneisworriedaboutthesizeoftheircarbonfootprint.Inordertoreduceglobalwarmingweneedtomakeourcarbonfootprintssmaller.ButhowmuchCOareweresponsiblefor? AnewbookbyMikeBerners﹣Leealeadingexpertincarbonfoot﹣printingmightbeabletohelp.TheCarbonFootprintofEverythinglooksatthedifferentthingswedoandbuyandcalculatestheamountofCO2theyproduceincludingtheingredientstheelectricitytheequipmentthetransportandthepackaging.Andit'sfrighteninghowmuchcarbondioxideeverythingproduces. Butallofthiscanhelpusdecidewhichbeertodrink.FromBerners﹣Lee'scalculationsit'sclearthatapint568mloflocally﹣brewed酿制的beerhasasmallercarbonfootprintthanabottleofimportedbeer.Thisisbecausetheimportedbeerhasbeentransportedfromfarawayanditusesmorepackaging.Thelocalbeeronlyproduces300gofCO2﹣buttheimportedbeerproduces900g!Soonepintoflocalbeerisbetterfortheenvironmentthanthreecansofcheapforeignbeerfromthesupermarket. Berners﹣Leehasevencalculatedthecarbonfootprintofcyclingtowork.Nothingismoreenvironmentally﹣friendlythanridingabikesurely?Wellitdependsonwhatyou'vehadtoeatbefore.Torideabikeweneedenergyandforenergyweneedfood.Soifweeatabananaandthenrideakilometerandahalfourfootprintis65gofCO2.Howeverifweeatbaconbeforethebikerideit's200g.Infactbananasaregoodingeneralbecausetheydon'tneedpackaging.Theycanbetransportedbyboatandtheygrowinnaturalsunlight. Sodoesthismeanthatcyclingisbadfortheenvironment?Absolutelynot.Ifyoucycleyoudontuseyourcar;andthefewercarsontheroadthefewertrafficjams.AndcarsintrafficjamsproducethreetimesmoreCO2thancarstravellingatspeed.Cyclingalsomakesyouhealthyandlesslikelytogotoahospital.Andhospitalshaveverybigcarbonfootprints! Somaybeit'stimeforusalltostartmakingsomechanges.Passmeabananaandapintoflocalbeerplease. 1Whichofthefollowingsproducesthesmallestcarbonfootprints? A.Apintoflocalbeer. B.Abottleofimportedbeer. C.Abananabeforea1.5kmbikeride. D.Baconbeforea1.5kmbikeride. 2Accordingtothearticletheauthorsuggestschoosingthelocalfoodbecauseitis. A.moretasty B.easiertobuy C.betterpackaged D.moreenergy﹣saving 3Thepurposeofwritingthisarticleisto. A.promoteanewbook B.advertisetheimportedbeer C.instructhowtomeasurethecarbonfootprint D.encouragepeopletoreducetheproductionofCO2
小华在测量小灯泡功率实验电路中所用电源电压恒为3V小灯泡上标有2.5V字样．1请用笔画线代替导线将图甲中的实物电路连接完整．2闭合开关前应将滑动变阻器的滑片移到最端选填左或右．闭合开关后发现灯泡不亮电压表有示数电流表无示数．若电路中仅有一处故障这个故障可能是．3若要测量灯泡的额定功率应移动滑片P使电压表的示数为V时记下电流表的示数．若电压表的示数为2.2V接下来应该4根据实验数据画出I﹣U图象如图乙所示则小灯泡的额定功率是W．5结合图乙的信息思考能否利用图电路采用控制变量的方法来探究电流与电压的关系并说明理由．
Saradon'tforgetyourpromisetomethatyouwillmow割草Mrs.Martin'syardthisweekendsaidDad.Don'tletmedown. Sarawastheoldestchildinthefamilyandoneofherchoreswastomowtheiryard.Mrs.Martintheir1neighborwasunabletotakecareofheryardinher70ssoSara'sdadhad2Saraforthisjob.3Mrs.Martin'syardwasnotbigSaraknewthejobwouldgoquickly.Howevershestilldislikedherdad's4. Whydidn'tyouaskmefirst?Sarahad5. Didyouaskmefirstwhenyouvolunteeredmetobeintheschoolfestivallastfall?askedSara'sfather. WellnoIdidn'taskyoufirst6youwouldhavedonethosethingsanyway.You'realways7tohelp. I8whenIcan.Dadanswered.SarawehaveknownMrs.Martinforaverylongtime.Shehasoften9ourfamily.Nowwecandosomethingforher.10thefeelingyougetfromhelpingsomeonemakesyou11whoisreallyhelpingwhom. Idon'tknowDadsaidSara.TheonlyfeelingIgetfrommowingouryardis12. JustyouwaitandseesaidDad AfterbreakfastSaramadeherwaytoMrs.Martin'syard.ShewasgoodatherjobandsoonhadMrs.Martinsyardlooking13.Mrs.Martincameoutsidewithabigglassoforangejuiceand14ittoher.Sarastoppedherworkand15enjoyedthedrinkwhileMrs.Martintalkedtoheraboutalloftheflowersinheryard.Seeingthe16inMrs.Martin'seyesSarabegantounderstandhowmuchtheyard17toMrs.Martin. AfterfinishingherdrinkSarareturnedtoworkwithanew18.Awarmfeelingbeganto19throughherbody.Herdadwas20.Itwashardtotellwhowashelpingwhom! 1A.strange B.new C.aged D.faithful 2A.guided B.volunteered C.ordered D.forced 3A.Once B.Since C.Unless D.Although 4A.promise B.argument C.permission D.introduction 5A.replied B.suggested C.complained D.announced 6A.but B.so C.or D.for 7A.proud B.willing C.afraid D.fortunate 8A.choose B.succeed C.hesitate D.try 9A.respected B.changed C.protected D.helped 10A.Besides B.Instead C.Therefore D.Otherwise 11A.imagine B.explore C.worry D.wonder 12A.scared B.moved C.tired D.relaxed 13A.tidy B.alive C.empty D.messy 14A.threw B.delivered C.offered D.sold 15A.eagerly B.generously C.carefully D.gratefully 16A.determination B.peace C.curiosity D.joy 17A.related B.meant C.belonged D.referred 18A.attitude B.wisdom C.inspiration D.expectation 19A.exist B.fly C.spread D.break 20A.unusual B.right C.serious D.helpful
一根粗细均匀的铜导线电阻为R如果把它截为长度相同的两段每段的电阻为R1则R1为R如果把原来的导线对折拧成一条使用其电阻为R2则R2为R．
2.5分汽车在水平公路上匀速直线行驶下列各对力中是平衡力的是
假设你是红星中学高三学生李华你的英国朋友Jim对中国文化很感兴趣.他即将过生日你给他准备了一件礼物并写信给他内容包括: 1.生日祝福; 2.礼物介绍; 3.选择该礼物的原因. 注意:1.词数不少于50; 2.信的开头和结尾已给出不计入总词数. DearJim Yours LiHua
请根据电源标出螺线管的极性磁感线方向和小磁针的极性．
如图所示电路R0的阻值为6ΩR2的阻值为R1的2倍只闭合开关S0时电流表的示数为1A开关都闭合时电流表的示数为3A．求 1只闭合S0时R0两端的电压 2开关都闭合时R1的电功率．
Onlineshopping1welcomebymostpeopleduetovariousreasons.Fortheconsumersitcansavesometimeforthepeople2don'thavemuchsparetime.Justclickingthemousetheycangetwhattheywant3stayingathome.Forthesellersitcancutsomecostsforthosewithoutenoughcirculatingfunds.Comparedwiththetraditionaltrademodetheydon'thavetospendmoneyin4rentahouse.
电炉是利用电流的工作的电炉丝断了去掉1/5后仍然接在原来的电源两端则在相同时间内产生的热量与原来产生的热量之比为．
如图所示小灯泡L标有“2.5V”的字样闭合开关S后灯泡L正常发光电流表电压表的示数分别为0.14A和6V试求 1电阻R的阻值 2此时灯泡L消耗的电功率． 3若将灯L换成一个“2.5V0.2A”的小灯泡L′时则L′能正常发光吗此时L′的实际功率是多大
将下列各现象中所属的物态变化的名称填人相应的空格内． 1冬天戴眼镜的人从室外进入温暖的室内眼镜上出现“雾气” 2冬天的早晨户外草地上积有白色的霜．
冬天用暖手水壸暖手是通过改变手的内能其中装的是水是因为水的大．
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如图所示的电路闭合开关后两电流表的指针正常偏转且偏转角度相同此时灯L1和L2的电阻R1和R2之比为
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