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测量标有“2.5V”字样的小灯泡在额定电压下工作时的电阻，小灯泡的额定功率估计在0.8W左右．实验室提供的器材有：两节干电池、电压表V（量程0﹣3V）、滑动变阻器、导线若干、开关、待测小灯泡．供选择...
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根据灯泡铭牌PZ220V25W.可以判断下列说法正确的是
灯泡适宜在25V.的电路中使用
灯泡在电压低于220 V 时，就不发光
灯泡在任何情况下工作时，电功率都是25W.
灯泡在220V的电压下工作时，电功率是25W
一个标有12V6W字样的灯泡它的额定电压是V额定功率是W在10V电压下工作时灯泡比在额定电压下发光
如图是一个小灯泡的电流和电压变化规律图像物理学中叫做伏安特性图像.由图像可知小灯泡在不同的电压下工作
ABC三盏电灯分别标有PZ220﹣25PZ110﹣2536V25W字样在各自额定电压下工作则最亮的
@B.C三盏电灯，分别标有“PZ220﹣25”．“PZ110﹣25”．“36V 25W”字样，在各自额定电压下工作，则最亮的是（ ）
A．灯泡A B．灯泡B
灯泡C
一样亮
某白炽灯泡的铭牌标有110V60W字样现将其接于220V的电源上则该灯泡在______
额定功率下工作
额定电流下工作
额定电压下工作
白炽灯短时工作后即烧毁
如图为一同学对一个额定电压为8.5V的小灯泡进行测量后得出的伏安特性曲线该同学算出此灯泡在额定电压下
0.5W
0.6W
0.8W
3.8W
小萌在更换灯泡时发现灯泡上标有220V40W的字样.下列说法中正确的是
该灯泡只能在220V电压下工作
该灯泡的实际功率是40W不变
该灯泡每秒消耗的电能是40W
该灯泡正常发光时的功率是40W
小明家有一调光灯使用的灯泡标有220V60W字样现在要使此灯泡在110V~220V的电压下工作用电器
小明同学用如图甲所示的电路研究灯泡L2.4V1.0W的伏安特性并测出该灯泡在额定电压下正常工作时的电
两只相同灯泡在并联使用时电源电压等于灯泡的额定电压U现在两只灯泡串联使用要使灯泡在其额定电压下工作电
1U
2U
3U
4U
某白炽灯泡正通电点燃测其端电压为200V查看其铭牌标有220V60W字样则该 灯泡在______
额定功率下工作
额定电流下工作
额定电压下工作
200V 端电压条件下可以安全运行，不损伤其寿命
某同学使用多用电表测量规格为220V25W灯泡阻值时用×100档时发现指针偏转角度过大他应该换用档填
根据白炽灯灯泡上所标明25W/220V之信息判 断下列哪个说法是正确的
灯泡适宜在25V的电路中使用
灯泡在电压低於220V时， 就不发光
灯泡在任何情况下工作时， 电功率都是25W
灯泡在220伏的电压下工作时， 电功率是25W
细心的刘芬同学在做电学实验时发现小灯泡上标有2.5V0.5A的字样老师告诉她2.5V是额定电压表示此
两只相同的灯泡在并联使用时电源电压等于灯泡的额定电压U现在两只灯泡串 联使用要使灯泡在其额定电压下工
1U
2U
3U
4U
用电器时的电压叫额定电压用电器在下工作时的功率叫额定功率灯泡上标有PZ220-25字样则它的额定电压
小红要测一个小灯泡的电功率她选用了以下器材一只标有2.5V字样的小灯泡灯丝电阻约为8Ω电流表电压表开
一只电热水壶铭牌上标有220V1100W的字样在额定电压下工作求1正常工作时的电流和电阻2通电5mi
根据灯泡铭牌PZ220-25所给信息判断下列说法正确的是
灯泡适宜在25伏的电路中使用
灯泡在任何情况下工作时，电功率都是25瓦
灯泡电压低于220伏时，不发光
灯泡在220伏的电压下工作时，电功率是25瓦
某同学使用多用电表测量规格为220V25W灯泡阻值时用×100档时发现指针偏转角度过大他应该换用档填
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10分短文改错 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.每处错误仅涉及二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. Smartphoneshadbecomepartofourdailylife.Nomatterwhowearewecanseepeoplebusyplaywiththeirsmartphones.Smartphonesarebenefittous.Theyhelpusescapethepressuresoflifeorgetinformation.Thereforeifwespendtoomuchtimeonthemwewon'thavetimecontactfacetofaceourfriendsandfamily.Andourlifestudyandworkwillbehurt.Inmyviewweshouldlimittoourusingsmartphonesexceptforapurposeoflearning.Meanwhileit'sabsolutenecessaryforustotakepartinmoreoutdooractivities.
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如图菱形ABCD中作BE⊥ADCF⊥AB分别交ADAB的延长线于点EF． 1求证AE＝BF 2若点E恰好是AD的中点AB＝2求BD的值．
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观察一列数﹣3036912…按此规律这一列数的第21个数是．
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10分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限一词. 2.只允许修改10处多者从第11处起不计分. LastSundayIjoinedthevoluntarygrouptohelpkeepthetrafficingoodorderatabigcrossingnearourschool.At800a.m.wearrivedthereworeredvestswiththewordVOLUNTEERontheback.Wehelpedwiththepoliceremindthepassers﹣bytoobeytrafficrule.Toourdelightedtheyallwaitedforthegreenlightpatientexceptonemotor﹣biker.Wealsogiveoutsomehand﹣madebrochuresabouttrafficregulationsforthatmanypeoplepraisedus.About4hourslatertheysaidgood﹣byetothepoliceandleft.Tiredaswewereweallfeltanhonortodoourparts.
若式子在实数范围内有意义则x的取值范围是．
30分第一节完形填空 UsingpublictoiletsinChinacanoftenbeachallengingundertakingparticularlyforthosenotpracticedintheartofsittingdeep.41researchersinChinahavecomeupwithanew42thattheysaycanhelp43apoisonousproblembotheringChina'spublictoiletstheoverpoweringodor恶臭. Unlikechemicalsolutions44areexpensiveandcan45theenvironmentthenewbiotreatmentisbeingthoughtasacost﹣effectivewayofprotectingtheenvironmentto4675percentofthebadsmellinbathroomsaccordingtoresearchersfromtheChineseAcademyofSciences.The47behindthetreatmentliesinaspecial48oftwotypesofbacteria﹣﹣﹣lactobacilliussp乳杆菌类细菌andstreptococcusthermopiles嗜热链球菌﹣﹣﹣aswellastheelementsoforanges.Thepreparedmixturewhichcomesinliquidorpowderformfeedsonhumanwastewhenappliedthus49thegrowthofodor﹣makingbacteria.Howevernotyetavailablein50theodor﹣killingtechnologyisstillundergoing51.Manyexperimentswiththesolutionarebeing52intheHuanglongNaturePreserveandJiuzhaigouNationalPark. Wecanseethetechnologyisespeciallysuitedforuseinthenonflushing非冲水toiletsoftenfoundinthesetypesofnaturepreservessincewaterregulationsintheseareasareoftenvery53andpipesaredifficultto54.Portablebathroomswhile55arerelativelyexpensivetomaintaincomparedwiththebiosolution. Thisway56canseethatnotonlyareyour57nicebutthetoiletsandtheotherfacilitiesatthesitearepleasantaswellandthetechnologyhasother58aswellsuchasthetreatmentofrubbishsaidtheadministratorofJiuzhaigouNationalPark. If59toitseffectivenessprovetruethetechnologyislikelytobe60bytheChinesehealthauthorities. 41.A.Because B.If C.But D.While 42.A.technology B.way C.machine D.psychology 43.A.confirm B.analyze C.findout D.dealwith 44.A.which B.they C.that D.those 45.A.benefit B.protect C.harm D.influence 46.A.leadto B.takein C.keepout D.makeuseof 47.A.identity B.science C.instruction D.procedure 48.A.seed B.poison C.mixture D.discovery 49.A.preventing B.keeping C.causing D.forbidding 50.A.gardens B.forests C.homes D.supermarkets 51.A.discussing B.using C.testing D.analyzing 52.A.planned B.simplified C.classified D.debated 53.A.strict B.harmonious C.drafted D.canceled 54.A.polish B.twist C.make D.fix 55.A.optional B.clean C.superb D.convenient 56.A.lawyers B.tourists C.burglars D.merchants 57.A.goods B.animals C.mountains D.guides 58.A.phenomena B.disadvantages C.applications D.characteristics 59.A.results B.guesses C.doubts D.claims 60.A.accepted B.refused C.abandoned D.banned
6分DearGod NowthatIamnolongeryoungIhavefriendswhosemothershavepassedaway.Ihaveheardthesesonsanddaughterssaytheyneverfullyappreciatedtheirmothersuntilitwastoolatetotellthem. Iamblessedwiththedearmotherwhoisstillalive.Iappreciatehermoreeachday.MymotherdoesnotchangebutIdo.AsIgrowolderandwiserIrealizewhatanextraordinarypersonsheis.HowsadthatImunabletospeakthesewordsinherpresencebuttheyfloweasilyfrommypen. HowdoesadaughterbegintothankhermotherforlifeitselfForthelovepatienceandjusthardworkthatgointoraisingachildForrunningafteratoddlerforunderstandingamoodyteenagerfortoleratingacollegestudentwhoknowseverythingForwaitingforthedaywhenadaughterrealizeshowwisehermotherreallyis HowdoesagrownwomanthankamotherforcontinuingtobeamotherForbeingreadywithadvicewhenaskedorremainingsilentwhenitismostappreciatedFornotsayingItoldyousowhenshecouldhaveutteredthesewordsdozensoftimesForbeingessentiallyherself﹣﹣lovingthoughtfulpatientandforgiving Idon'tknowhowdearGodexcepttoblessherasrichlyasshedeservesandtohelpmeliveuptotheexampleshehasset.IpraythatIwilllookasgoodintheeyesofmychildrenasmymotherlooksinmine. 25.Theauthorpreferstoshowappreciationtohermother. A.totellhermotherfacetoface B.tomakeacall C.nevertotellhermother D.towriteitout 26.Accordingtothelastparagraphtheauthortendsto. A.followhermother'sexample B.prayforfriends'mother C.askGodmorequestions D.showlovetohermother 27.Whatistheauthor'spurposeofwritingthepassage A.Totellushowtoraiseachild. B.Tomemorizeherfriends'mothers. C.Tothankhermotherandbeagoodmother. D.Toexpectsomethingspecialfromherchildren.
10分SocialPhobia It'snaturaltofeelnervousorshyinfrontofothersattimes.Mostpeoplemanagetogetthroughthesemomentswhentheyneedto.71It'sprobablymorethanshyness.Itmaybuildupintoapowerfulfear.Asaresultpeoplefeeluncomfortableparticipatingineverydaysocialactivities.Thisiscalledsocialphobiaalsocalledsocialanxiety. 72Itpreventsthemfromchattingwithfriendsinthelunchroomjoininganafter﹣schoolcluborgoingtoaparty.Sometimestheyevenfeeltoonervoustoaskaquestioninclassorgotoateacherforhelp.Socialphobianotonlypreventspeoplefromtryingnewthings.Italsopreventsthemfrommakingthenormaleverydaymistakesthathelppeopleimprovetheirskillsstillfurther. Itisreallysadisn'titButthegoodnewsisthatpeoplewithsocialphobiacanlearntomanagefeardevelopconfidenceandcommunicatingskillsandstopavoidingthingsthatmakethemnervous.Ofcourseit'snotalwayseasy.Dealingwithsocialphobiatakespatiencecouragetofacefearsandthewillingnesstopractice.73 Therapists治疗师canhelppeoplecreateaplanforfacingsocialfearsandbuildtheskillsandconfidencetoovercomeit.Andfamilyorfriendsareespeciallyimportantforthem.74Friendsandfamilycanencouragethemtopickasmallgoaltoaimforremindthemtogoforitandbetherewhentheymightfeeldiscouraged.Goodfriendsandfamilyaretheretocelebrateeachsmallsuccessalongtheway. Littlebylittlesomeonewhodecidestodealwithextremeshynesscanlearntobemorecomfortable.75Asshynessandfearsbegintomeltconfidenceandpositivefeelingsbuild.Prettysoonthepersonisthinkinglessaboutwhatmightfeeluncomfortableandmoreaboutwhatmightbefun. A.Friendscanovercometheirfears. B.Butforsometheanxietycanbeextreme. C.Theyarenotabletomakeeyecontactwithclassmates. D.Socialphobiamakespeoplelonelyordisappointedovermissedopportunities. E.Italsotakesacommitmenttogoforwardratherthanbackawaywhenfeelingshy. F.Eachsmallstepforwardhelpsbuildenoughconfidencetotakethenextsmallstep. G.Thesupportfromthosekeypeoplehelpsthemgatherthecouragetotrysomethingnew.
1分IgethomelateGrandmaalwaysleavesalightonforme. A.Wherever B.However C.Whenever D.Whatever
求式子÷的值其中m＝﹣2019．
6分MelbourneAustralia Melbourneisahot﹣spottraveldestinationandit'seasytoseeitsbeautifulbeachesandbusycitylife. Whyit'sagreatchoiceAustraliaasawholeisconsideredasafedestinationforinternationaltravelandbecauseofthatmanysolotravelersgothereAsanEnglish﹣speakingcountryyouwon'tbefacedwithanylanguagebarriers.Melbourneiseasytogetaroundbecauseyoucanwalkorbikepracticallyanywhere! Thailand Thailandisgreatforsolotravelers﹣perhapsbecauseitisoneoftheBuddhistmindsetswhichpromoteequalityamongthesexes. Whyit'sagreatchoiceThailandisknownforitsfriendlyatmosphereandasatravelhot﹣spotthereareplentyofchancestomeetotherlike﹣mindedtravelers.Itiswellknownforbeingverycheapespeciallyinthenorth.Itisagoodchoiceifyouwanttogetawayonabudget.Thailandhasalottoofferfromtheparty﹣centralBangkoktobeautifulbeachesandtropical热带jungle. HongKongChina HongKongisagreatplacetorelaxforsolotravelersasitisfullofZenmomentssuchasbeautifulgardensandTaiChiclasses. Whyit'sagreatchoiceHongKongisregardedasoneofthesafestcitiesintheworld.Ifyou'renotwell﹣traveledorperhapsabittiredofthingslikelanguagebarriersHongKongisagreatplacetostartasitmixesbothEasternandWesternatthesametime. BaliIndonesia Baliisaspiritualplacewithyogaspashealthyfoodandbeaches.ThecombinationoffriendlypeopleandsplendidlyvisualculturehasmadeBaliIndonesianumberonetouristattraction. Whyit'ssogreatYouwon'tbetheonlysolotravelerinBali.Everyoneisknownforbeingextremelyfriendlyandyou'resuretomeetsomeamazingcharactersalongtheway.AsaHinduislandBaliistheperfectplaceforarelaxingandspiritualretreat静修.TheSacredMonkeyForestinUbudisfantastic﹣ifyoulikemonkeysanyway. 1.Whatdothefourplaceshaveincommonaccordingtothetext A.Theyoffergoodspasandyoga. B.There'renolanguagebarriers. C.They'regreatforsolotravelers. D.They'recheaptotravelaround. 2.Wherecanyouenjoybothconvenienttransportandbeautifulbeaches A.MelbourneAustralia. B.Thailand. C.HongKongChina. D.BaliIndonesia. 3.WhathasmadeBaliIndonesiaNo.1touristattraction A.Yogaspashealthyfoodandbeaches. B.Meetingsomeamazingcharactersalongtheway. C.FantasticmonkeysintheSacredMonkeyForest. D.Friendlypeopleandsplendidlyvisualculture.
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