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指出下列符号中数字“2”的含义： （1）2H ； （2）SO2 ； （3）Fe2+ ．
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写出下面面符号或示意图中数字2的含义2HMg2+
指出下列符号中2的涵义12H2H232CO4Mg2+.
1指出下列符号的意义H__________________2H__________________H
指出下列化学符号中2所表示的含义12H2S2–32Ca2+
写出下面氧元素符号周围的数字2分别表示的含义1O222O5H262H2O
写出下列符号中数字2的含义.12H2O前面的2.22S3Ba2+4.5H2.
指出下列化学符号中数字2的意义①CO②H2O③2NO④2H⑤nSO41表示分子个数的是___填序号下
回答下列问题1用恰当的化学符号表示氧元素2个氢原子n个钠离子保持氧气化学性质的最小粒子.2写出下列符
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写出下列符号中数字的意义12H2O前面2的意义右下角2的意义22H前面2的意义32Al3+前面2的意
说出下列符号中2的含义2H2O
指出下列化学符号中数字2的意义①CO②H2O③2NO④2H⑤nSO41表示分子个数的是____填序号
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首先得到“同一导体通过它的电流与它两端的电压成正比”的科学家是
6分Myrbetriqisaprescription处方medicationforadultsusedtotreatthefollowingsymptomsduetoaconditioncalledoveractivebladder●Urgeurinaryincontinenceastrongneedtourinatewithleakingorwettingaccidents.●Urgencyastrongneedtourinaterightaway.●Frequencyurinatingoften.ItisnotknownifMyrbetriqissafeandeffectiveinchildren.BeforeyoutakeMyrbetriqtellyourdoctoraboutallofyourmedicalconditionsincludingifyou●haveliverproblemsorkidneyproblems.●haveveryhighuncontrolledbloodpressure.●havetroubleemptyingyourbladderoryouhaveaweakurinestream.●arepregnantorplantobecomepregnant.●arebreastfeedingorplantobreastfeed.TakeMyrbetriqexactlyasyourdoctortellsyouto●TakelMyrbetriqtabletltimeaday.●TakeMyrbetriqwithwaterandswallowthetabletwhole.Dotchewbreakorcrushthetablet.●TakeMyrbetriqwithorwithoutfood.Specialattention●IfyoumissadoseofMyrbetriqbegintakingMyrbetriqagainthenextday.●IfyoutaketoomuchMyrbetriqcallyourdoctororgotothenearesthospitalemergencyroomrightaway.MyrbetriqmaycauseserioussideeffectsincludingTellyourdoctorifyouhaveanysideeffectthatbothersyouorthatdoesnotgoaway.ThesearenotallthepossiblesideeffectsofMyrbetriq.Callyourdoctorformedicaladviceaboutsideeffects.YoumayreportsideeffectstotheFDAatl﹣800﹣FDA﹣1088.Storagerequirements●StoreMyrbetriqbetween59°Fto86°F15℃to30℃.Keepthebottleclosed.●Safelythrowawaymedicinethatisoutofdateornolongerneeded.●KeepMyrbetriqandallmedicinesoutofthereachofchildren.1Whoisnotsuitableforthismedicine?A.Grown﹣ups.B.Children.C.Women.D.Oldpeople.2InwhichsituationdoyouneedtotellthedoctorbeforetakingMyrbetriq?A.Beingawould﹣bemother.B.Goingtotakeanexam.C.Havingheart&lungproblems.D.Sufferingmildhighbloodpressure.3HowshouldyoustoreMyrbetriq?A.Reserveitinthefreezingchamber.B.Keepitawayfromchildren.C.Storeitwiththebottleopen.D.Preserveitasyoulike.
在图所示的电路中电源电压为18伏且不变电阻R1的阻值为20欧滑动变阻器R2上标有“10Ω1A”字样电压表“0～15V”量程档已损坏．闭合电键S后求 1当电压表示数为2伏时电流表A的示数以及电阻R1消耗的电功率． 2现设想选择一个电阻R0来替换电阻R1要求在移动变阻器滑片P的过程中电压表能发生满偏且电路各元件均能正常工作．求 ①电阻R0的取值范围． ②满足上述条件的情况下电路中的最小电流．
在图中的〇里填上适当的电表符号当电键闭合时电路能正常工作．
10分HealthyagingtopicoverviewWhatishealthyaging?1Howyouwillfeelasyougetolderdependsonmanythingsincludingwhathealthproblemsruninyourfamilyandthechoicesyoumake.Ifyoutakegoodcareofyourbodyandlearnpositivewaystodealwithstressnowyoucanslowdownorevenpreventproblemsthatoftencomewithgettingolder.Whatdetermineshowhealthyyouwillbeasyougetolder?2Themostimportantoneisyourffunilyhistorygenetics.Ifyourfamilymembershavediseasesorongoinghealthproblemsthenyoumayhaveagreaterchanceofhavingthoseproblemsyourself.Whatkindsofchangesshouldyouexpectasyouage?Changesasyougetolderareusuallygradual.Certainphysicalchangesarecommon.Mostpeoplestartneedingreadingglassesaroundage40;manyhavesomehearinglosslaterinlife;thekidneysarelessabletokeepenoughwaterSoasyougetolderit'simportanttobephysicallyactivedrinkplentyofwaterandchoosehealthyfoods.3Whatdoyouneedtodotofeelyourbestasyouage?Oneofthemostimportantthingsyoucandoforyourhealthatanyageistobephysicallyactive.4Peoplewhostayactivearelesslikelytogetdepressed.PhysicalactivitycanbeanythingfromwalkingtogardeningtoworkingoutattheUm.Theimportantthingistobeactivealmosteveryday.Onthewholeit'snevertooearlyortoolatetochangebadhabitsandstartgoodones.5A.Gettingolderisanaturalpartoflife.B.Whatcanyoucontrolabouthealthyaging?C.Physicalactivitykeepsyourbodystrongandithelpswithhowyoufeel.D.Doingthesethingswillhelpyourbodyworkwellforalongerperiodoftime.E.Thechangesyou'llgothroughasyougetolderdependonanumberofthings.F.Whateveryourageorconditionthereisatypeofphysicalactivitythat'srightforyou.G.Wheneveryoustartahealthylifestylecanmakeadifferenceinhowyoufeelandwhatyoucando.
某物理兴趣小组按照练习册的“课题与实践”用如图所示的电路探究人体的电阻和人体的安全电压．他们先用如图a所示电路测出电源电压再用图b所示电路测出人体的电流并计算人体的电阻并将测量结果记录在下表中． 表一 表二 1从表一和表二中所测得人体干燥时电阻初步可知． 2当通过人体的电流为1毫安时人体就会有麻刺感若将此电流作为安全电流通过计算写出过程说明小张同学的安全电压大约为． 3测量仅供参考绝不允许人体直接接触算出的“安全电压”电路请对图c设置警示语．
两个物体分别挂在弹簧测力计上将它们同时浸没到水中发现两个弹簧测力计的示数的减小值相同．由此可以判断
R1R2两个电阻的阻值分别为10欧和20欧把它们并联在如图所示电路中闭合电键S电阻R1与R2两端的电压之比为电流表A1与A2示数之比为．若断开电键S电流表的示数不变．选填“A1”“A2”或“A3”
某导体电阻为20欧若通过该导体的电流为0.3安则10秒内通过该导体横截面的电荷量为库该导体两端的电压为伏．当该导体两端电压为3伏时该导体电阻为欧．
在图所示的电路中有一根导线尚未连接请用笔画线代替导线补上．补上后要求闭合电键S后向右移动滑动变阻器的滑片电流表的示数变小．
甲乙两个正方体放置在水平地面上如图ab所示它们对地面的压强分别为p甲和p乙．将它们沿竖直方向切下相同比例的部分后再把甲切下部分放在甲剩余部分的下方把乙切下部分放在乙剩余部分的上方如图cd所示此时它们对地面的压强变为p甲'p乙'．若p甲'＝p乙'则下列判断中正确的是
下列各项利用连通器原理工作的是
在探究凸透镜成像的实验过程中移动光屏至如图a所示位置时屏上出现清晰的像则该像是的选填“放大”或“缩小”．若将蜡烛移至10厘米刻度处要在屏上再次找到清晰的像应将光屏向选填“左”或“右”移动．根据图b中通电螺线管的S极可判断小磁针的左侧为极电源的左端是极．
重为12牛的物体静止在水平地面上请在图中用力的图示法画出该物体受到的重力．
在如图所示的电路中电源电压为4.5伏若电路中仅有一处故障且只发生在电阻R灯L上．电键S闭合前后电压表指针的位置不变且灯不亮请根据相关信息写出电压表的示数及相应的故障．
如图所示一根长为1.2米的轻质杠杆OA可绕固定点O转动C点处悬挂一重为60牛的物体．已知AB＝BC＝CD＝DO 1若在B点用竖直向上的力使杠杆在水平位置平衡求这个力的大小． 2若在A点施加一个力使杠杆水平平衡甲同学认为该杠杆一定是省力杠杆乙同学认为该杠杆可能是费力杠杆．你赞同哪位同学的观点并说明理由．
在如图a所示的电路中电源电压保持不变电阻R1的阻值为6欧滑动变阻器R2上标有“20Ω2A”字样两电流表的表盘均为如图b所示． 1只闭合电键S1其中一个电流表的示数为1安．求电源电压． 2同时闭合电键S1和S2在移动滑片P的过程中电流表A1示数的最小值． 3当把滑片P移动到某一位置时电流表A1指针偏离零刻度的角度为α电流表A2指针偏离零刻度的角度为β．若αβ＝35通过计算确定此时变阻器R2的阻值大小．
酒精的密度为0.8×103千克/米3其单位读作．一只杯子最多可盛质量为0.3千克的水则它最多可盛下质量为千克的酒精．同一个杯子分别盛满酒精和水时对杯子底部的压强较大选填“酒精”或“水”．
8分Thepalm﹣forward掌心向外'V'signformedbyraisingandspreadingtherirsttwofingershasthreedifferentmeaningsinAmericanculture.Themostpopularmeaningofthe'V'signwasinventedin1941byaBelgiangVictorDeLavalaye.WantingasymbolforresistancetotheNazioccupationhecameupwiththesingleletter'V'whichstoodnotonlyforhisownfirstnamebutalsoforEnglishvictoryFlemishvirijheidandFrenchvictoire.ThesymbolismofthesignspreadveryquicklyandWinstonChurchilluseditconstantlyinpublicappearance.Thusthroughoutthe1940sand1950sthegesturemeantsimply'victory'.Thesecondmeaningcameinthe1960s.BecauseofitsmilitaryimplicationAmericanantiwarprotestorsusedthesignsarcasticaUy讽刺地againstthearmssothatitbecameknownasthe'peacesign'.Inthe1970sthe'W'signwhichhadlostitsmilitaryimplicationwasacommongrPltingamongfreedomloversacidheadspoliticalradicalsandultimatelyyoungpeopleingeneral.Sobyaboutthemiddleofthe1970sitnolongergavecluetotheuser'sphilosophy.Thethirdmemungistheoldestandleastcommon.Americanchildrenjokinglyput'V'whichresembles'horns'behindfriends﹣headsingroupsnapshot.TheyareunknowinglyreproducingsomethingthatsouthemEuropeanswouldfindhighlyoffensive.Thismischiefcalled'hornsoftheDevil'isavariantoftheEuropean'horns'gesture9wluchisobscene猥亵的.Herethe'w'signmeans'Yourwifehasbeencheatingonyouorwhenplacedbehindanother'sheadhiswifehasbeencheatingonhim.'IntheUnitedStatesthegestureistypicallygivenwiththepalmfacingtheviewer.TheBritishuseboththisversionandanolderpalm﹣backwardversion;thelatterisobsceneinAmericancultureandcorrespondstotheAmerican'finger'.Churchillgotsomesurprisedstaresin1941whenevidentlyunawareofthemeanusagehegavethepalm﹣backward'V'toBritishtroops.InEnglandtodayyoucouldhavetobeasocialhermitnottounderstandthedistinction.AstonishinglyhoweverMargaretThatcherrepeatedChurchill'senorafterhervictoryinthe1979election.1What'sthemostpopularmeaningofthe'V'sign?A.VictoryB.Peace.C.Cheat.D.Freedom.2WhydidChurchillgetsomesurprisedstaresaccordingtothelastparagraph?A.Hewasproudofhistroops.B.Hehadwantedtobeahermit.C.Hewasinsensibleofthemeanusageofthe'V'sign.D.HewantedtoshowcongratulationstoBritishtroops.3Whatcanbeleamedfromthetext?A.The'V'signsimplymeansvictorysince1941.B.The'V'signmeaningpeacewasinventedbyaBelgian.C.ThatchermadethesameerrorasChurchillafterhersuccessfulelection.D.AmericanantiwarprotestorsusedthesigntogreetamongfreedomloveyS.4Whatcanweconcludefromthepassage?A.It'snevertoooldtoleam.B.Thinkwellbeforeyouspeak.C.Actionsspeaklouderthanwords.D.Trytoknowculturediversityfullyandregionally.
在下列各组不同色光中三原色光为
如图是某同学测定“小灯泡功率”的实验电路图小灯额定电压为2.5V．在实验中至少要多次调节滑动变阻器电键闭合前滑片P应处于选填“a”或“b”端其目的是使然后接通电路再次调节目的是使．在实验时测得的数据如表．在整理数据计算功率时发现其中一次实验结果与其他两次实验结果相差很大经检查原来是有一个电流的示数读错了．该同学选用的电流表的量程是0﹣0.6安．试分析数据表中第次电流的读数错了正确的应为小灯泡额定功率P额＝瓦．
某兴趣小组在进行测定小灯泡额定功率实验时可用的实验器材有标有“0.2安”字样的小灯泡3节新干电池标有“10欧1安”和“5欧1安”的滑动变阻器电压表电流表电键和导线若干所有器材均完好．他们第一次选择了3节新干电池和标有“5欧1安”的变阻器及其它相关器材进行实验实验电路连接正确步骤规范但在实验过程中发现无法完成实验．接着他们更换了部分器材使用2节新干电池和标有“10欧1安”的变阻器重新进行了第二次实验但在实验过程中发现依旧无法完成实验．然后他们经商量对器材又做了一定的调整最后顺利地完成了实验． 1请画出正确的实验电路图． 2请分析他们第一次实验时无法完成实验的原因是． 3该小灯泡的额定功率应介于瓦至瓦之间．
图a所示仪器的名称是用来测量物体的在电学实验中电流表应该在电路中选填“串联’’或“并联”图b中电流表的示数为安．
体积为5×10﹣4米3的金属球浸没在水中求金属球受到的浮力F浮．
如图所示水平面上的圆柱形容器中分别盛有甲乙两种液体且甲液体对容器底部的压力等于乙液体对容器底部的压力．现在两容器中各放入一个物体漂浮在液面上且液体不溢出．下列说法中正确的是
下列运用相同科学方法研究的是 1同一直线上力的合成 2用水流比作电流 3用磁感线描述磁场 4串联电路的总电阻
如图所示行李托运时行李箱随水平传送带一起做匀速直线运动．以下说法中属于一对平衡力的是
如图所示不计滑轮重及摩擦物体AB均重为20牛．当用力F2匀速提升物体B时以滑轮的轴为参照物物体B是的选填“静止”或“运动”此时力F2大小为牛．若F1和F2所做的功相等物体AB移动的距离之比是．
15分Mobilepaymentshavemadeourlifemoreconvenientand1enjoybyfreeingusfromthetroubleofhavingtotakeourwalletsoutwithus.Butasupermarkethasgoneonestepfurtherallowingcustomerstopay2instantusingjustafingertip.ShoppersatonestoreatBrunelUniversitycanpayforitems3usethermiquevein静脉pattern.intheirfingertipsandit's4firststoretoadoptsuchtechnology.Thisnewmethodofpaymentmeansthatcustomerscanpayforitemsinjustafew5second.Sthalerthecompanybehindthetechnology6explainthatitusesirufraredscanners扫描仪7readthepattemofveinsinthefmger.Ithinksthistothecustomer'sbankdetailswhich8keepsafebypaymentproviderWorldpay.Thefirmisalsoresponsible.9millionsofonlineshoppers'detailsaroundtheglobe.'Therearenoknowncases10thissecurityhasbeenviolatedanddozensofBrunelstudentsarealreadyusingthetechnology'SimonBinnscommercialdirectorofSthalertoldthereporter.
武大靖夺取了2018年平昌冬奥会中国的第一枚金牌．起跑时他用力蹬冰面后飞速冲出说明力的作用是力可以改变物体的．在冲过终点减速的过程中他的惯性动能．后两空均选填“增大”“不变”或“减小”
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