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如图所示，把用毛皮摩擦过的橡胶棒靠近缓慢下流的细水流，发现水流向橡胶棒偏转，这是由于带电体具有 性质的缘故．橡胶棒在与毛皮摩擦时会得到电子，则橡胶棒带 （选填“正”或“负”）电，若把一个带负...
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用与橡胶棒摩擦过的毛皮靠近与丝绸摩擦过的玻璃棒则毛皮与玻璃棒
相互吸引
相互排斥
无相互作用
无法判断
如图所示把毛皮摩擦过的橡胶棒靠近悬挂的轻质小球时发现轻质小球被推开说明轻质小球带电荷.
丝绸摩擦过的玻璃棒带电是因为玻璃棒在摩擦的过程中电子若再把丝绸与毛皮摩擦过的橡胶棒靠近发现它们相互
在探究电荷的种类和相互作用规律的实验中1发现两根用丝绸摩擦过的玻璃棒靠近时会相互而丝绸摩擦过的玻璃去
如图所示一根戳有小孔没有戳穿的饮料吸管能在支架上绕轴自由转动当用毛皮摩擦过的橡胶棒靠近用餐巾纸摩擦过
摩擦起电创造了电荷
用毛皮摩擦过的橡胶棒带正电
用餐巾纸摩擦过的吸管带负电
与吸管摩擦过的餐巾纸带负电
橡胶棒与毛皮摩擦橡胶棒由于电子而带负电.把带负电的橡胶棒靠近与作业纸摩擦过的塑料吸管发现吸管被推开说
橡胶棒与毛皮摩擦橡胶棒由于___________电子而带负电把带负电的橡胶棒靠近与作业纸摩擦过的塑料
在探究电荷的种类和相互作用规律的实验中1发现两根用丝绸摩擦过的玻璃棒靠近时会相互而丝绸摩擦过的玻璃去
在探究电荷的种类和相互作用规律的实验中1发现两根用丝绸摩擦过的玻璃棒靠近时会相互而丝绸摩擦过的玻璃去
如图所示用毛皮摩擦过的橡胶棒靠近水流时发现水流明显偏向橡胶棒一侧水流受到橡胶棒的吸引力是
重力
静电力
洛伦兹力
安培力
2015·陕西如图所示当两根用毛皮摩擦过的硬橡胶棒相互靠近时二者相互________.此时橡胶棒所带
在探究电荷的种类和相互作用规律的实验中1发现两根用丝绸摩擦过的玻璃棒靠近时会相互而丝绸摩擦过的玻璃去
如图所示毛皮摩擦过的橡胶棒接触不带电的验电器金属球时验电器金属球带_______电毛皮摩擦过的橡胶棒
2014•河南橡胶棒与毛皮摩擦橡胶棒由于电子而带负电.把带负电的橡胶棒靠近与作业纸摩擦过的塑料吸管发
橡胶棒与毛皮摩擦橡胶棒由于而带负电．把与橡胶棒摩擦过的毛皮去靠近与纸摩擦过的塑料吸管发现吸管被推开
在探究电荷的种类和相互作用规律的实验中1发现两根用丝绸摩擦过的玻璃棒靠近时会相互而丝绸摩擦过的玻璃去
将两个表面光滑的铅块相互紧压后发现它们会粘在一起这说明用丝绸摩擦过的有机玻璃棒靠近用毛皮摩擦过的橡胶
在探究电荷的种类和相互作用规律的实验中1发现两根用丝绸摩擦过的玻璃棒靠近时会相互而丝绸摩擦过的玻璃去
如图所示
B.为相互接触的用绝缘支架支持的金属导体，起初它们不带电。下列操作中能让A.带上负电的是 A.用毛皮摩擦过的橡胶棒靠近A.的左端
用丝绸摩擦过的玻璃棒靠近A.的左端
用毛皮摩擦过的橡胶棒接触B.的右端
用丝绸摩擦过的玻璃棒接触B.的右端
橡胶棒与毛皮摩擦橡胶棒由于得到或失去电子而带负电把带负电的橡胶棒靠近与作业纸摩擦过的塑料吸管发现吸管
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如图正方形ABCD的边长为4点PQ分别是CDAD的中点动点E从点A向点B运动到点B时停止运动同时动点F从点P出发沿P→D→Q运动点EF的运动速度相同．设点E的运动路程为x△AEF的面积为y能大致刻画y与x的函数关系的图象是
直接写出各组数的最小公倍数 4和915和309和12． ．
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30分Afterthreehours'shoppingMichaelSurrelheadedhome.Atfirsthedidn'tseetheblacksmokeorflames1fromthewindowsofhisneighbors'home.Heandhiswifehadjustparkedaroundthecornerfromtheirownhousewhentheygotacallfromoneofhisdaughters:Thehousenextdoorison2!Aftergettingoutofthecarhewentto3. Thebaby'sinthere!awomencried.Surrellthen64instinctivelyraninside.Enteringtheburninghousewaslike4abucket桶ofblackpaintSurrellsays.Thethick5causedhimtostumble跌跌撞撞aroundandmadeitimpossibleto6. Afterafewminutesinthesmoke﹣filledhousehesteppedoutsideto7hisbreath.Yetbecausethehousehada8designtohishefoundthestairsand9ittothesecondfloor.Heturnedtotherightandwasmetbyintense10.Thena11butclearmoan呻吟声washeard.Hemovedslowlytowardthe12.Afearfulthought13hismind:I'mprobablygoingtodieuphere.Finallyhetouchedsomething.He14throughthesmokeandranblindlyintotheblackness.15SurrellputTiaradownontheporch.HestarredCPR心肺复苏﹣﹣thefirsttimehe'deverdoneso.Soona16camefromTiara'sthroat.Sheopenedherevesandtookabreathonherown. Surrellwokeupinthehospitalacoupleofdayslaterhaving17severeburnstotheupperpartofhislungs.Hespentoveraweekinthehospital.Tiarawasreleasedfromthe18afterafewdays.It'sasmallpriceto19.hesays.I'ddoitagaininaheartbeat.Wouldn'tgiveitasecond20. 1A.resulting B.disappearing C.shooting D.arising 2A.offer B.fire C.order D.sale 3A.investigate B.smell C.join D.ask 4A.digginginto B.turninginto C.1ookinginto D.runninginto 5A.smoke B.fog C.cloud D.coat 6A.relax B.communicate C.breathe D.talk 7A.save B.catch C.hold D.check 8A.separate B.simple C.different D.similar 9A.made B.got C.carried D.send 10A.light B.feeling C.heat D.cold 11A.unique B.gentle C.sweet D.soft 12A.door B.sound C.life D.noise 13A.concentrated B.transformed C.crossed D.broadened 14A.fought B.cut C.pulled D.drove 15A.Obviously B.Gradually C.Unluckily D.Eventually 16A.shout B.cough C.pain D.smile 17A.suffered B.enjoyed C.covered D.avoided 18A.house B.school C.prison D.hospital 19A.adjust B.afford C.pay D.waste 20A.plan B.mind C.try D.thought
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下列运算正确的是
用递等式计算能简算的要简算．
甲数＝2×2×3×5乙数＝2×3×3．这两个数的最小公倍数是
8分ScientistsinWesternAustraliaclaimtohavemadeanewdiscovery﹣theyhavefoundgoldintheleavesandtwigsoftrees.Theresearchersbelievethatthetreessuckupthegoldfromdeepundergroundover30metresdown.Thediscoveryhasbeendescribedasthefirstofitskindintheworld.Australiangoldexplorationcompaniesarepleasedbecauseitwillmakefindinggoldcheaper.Ratherthandrillingdeepholestofindgoldtheyhavemorewaystoexaminetreeleavesandbranches.Thereisonlyatinyamountofgoldintheleaves.Itwouldtake500treestomakeonegoldring.ThegoldisfoundusingaspecialX﹣raymachineownedbyanAustraliangovernmentagency.ApureX﹣rayandapowerfulmicroscopescantheleavesandbranches. Theclaimthatthisisthefirsttimethatgoldparticles微粒havebeenfoundinlivingmaterialmightnotbetruethough.AncientChinesewisdomunderstoodtheconnectionbetweenplantsandthepreciousstonesandmineralsunderneaththem.Theyusedplantlifetofindmineralsandthatwasthousandsofyearsago.IntheZhouDynastyitwaswritteninabookthatacertainplantgrewonlyneardepositsofgold.Overthenext2000yearsChinesepeoplewroteaboutdifferentplantsandhowtheygrewshowedwheremineralsandpreciousstonessuchasjadecopperleadsilverandgoldwere. Evenmoreimportantlyinthe﹩1000SuSongdescribedhowcoppergoldsilverleadandtinwereobservedandtakenfromcertainplants.Thesewereamazingscientificdiscoveries.Meanwhilethisknowledgewasunknownintherestoftheworlduntilabout1600.ThiswaswhenaBritishmanrealisedthatoaktreesgrewlargerandgreenerwheretherewasalum明矾intheground.MaybeancientChinesehasmoreknowledgetoteachmodernscientists. 1WhatcanweknowfromParagraph1? A.500deadtreescanmakeonegoldring. B.Thetreescanabsorbthegoldfromdeepunderground. C.Scientisthavefoundgold30metersbelowunderground. D.Thecompaniesfindithardtofindgold. 2Howdoscientistsfindgoldintheleaves? A.Byobservingtheleavescarefully. B.Bydrillingdeepholes. C.Byusingaspecialx﹣ray. D.Byreferringtoancientbooks. 3Whofirstdiscoveredthattherewasconnectionbetweenplantsandminerals? A.AncientChinesepeople. B.SuSong. C.Australianscientists. D.ABritishman. 4Whatisthepurposeofthelastparagraph? A.Tointroducetwogreatscientistsinancienttimes. B.Toprovidemoreevidencetosupportthewriter'sopinion. C.Toshowhowancientpeoplegotgoldfromcertainplants. D.ToprovethatancientChinesehasmoreknowledgethanmodernscientists.
方程“9x﹣5x＝30”的解是
8分Theideaofaworldlanguageisnotanewone.Inthe1870sand1880saPolishmancalledDrLudovicZamenhofinventedanewlanguagecalledEsperanto.ZamenhofhopedthatifeveryonelearnedEsperantotherewouldbegreaterpeaceandunderstandingintheworld.AtfirstmanypeopledidlearnEsperantoandinChinain1911peopleevendiscussedmakingEsperantotheofficiallanguage.NowadaysEsperantoisstilllearnedandspokenbysomepeoplebutnobodynowthinksthatitwillbecomeaworldlanguage. Thequestionpeopleasktodayis:WillEnglishbecometheworldlanguageinthefuture?MoreandmolepeoplearelearningEnglishandEnglishhasbecometheinternationallanguageofsciencebusinessdiplomacyandtheInternet.Isitpossiblethatby2050everyworldcitizenwillspeakEnglisheitherasafirstorsecondlanguage?ManypeoplethinksohutothersarguethatitwillbenormalforpeopletobemultilingualinthefutureandthatpeoplewhoonlyspeakEnglishwillbeatadisadvantage.Anotherargumentwehavetoconsideristhatadifferentlanguagemightemergeasaworldlanguage.AfterallEnglishhasonlybecomeadominantlanguagebecauseofBritishcolonialhistoryandAmericaneconomicpower.Chinesealreadyhasmorenativespeakersthananyotherlanguageintheworld.AndwithitsgrowingeconomicstrengthitcouldbethatinthelongtermpeoplefromothercountrieswillfeeltheneedtolearnChinese. Wealsoneedtoconsiderwhetheritwouldbeagoodthingifaworldlanguageemerged.ItcouldbethatasinZamenhof'sdreamforEsperantoaworldlanguagewouldcontributetoworldpeaceandunderstanding.Ontheotherhanditcouldmeanthatmanylocallanguagesandlocalcultureswoulddie.Onlytimewilltellwhetheraparticularlanguagewillbespokenbyeveryoneintheworld.WhoknowsinthefutureyoumightbewritingChinesematerialsformychildrentostudy! 1WhatdoweknowaboutEaperanto? A.Peoplehavemadeittheofficiallanguage. B.Itwasinventedin1911. C.ItishighlythoughtofbyZamenhof. D.Itwilldefinitelybecomeaworldlanguage. 2HowisParagraph2mainlydeveloped? A.Bylistingexamples. B.Byraisingquestions. C.Byprovidingdata. D.Byfollowingtimeorder. 3WhywillpeopleneedtolearnChineseinthefuture? A.BecauseChinaisadominantcountry. B.BecauseChinahasabroaddiplomacypolicy. C.BecauseChina'economyisdevelopingrapidly. D.BecauseChinamakesthegreatestcontributionintheworld. 4Whatisthewriter'sattitudetowardsaworldlanguage? A.Critical. B.Indifferent. C.Doubtful. D.Objective.
如图在△ABC中∠B＝55°∠C＝30°分别以点A和点C为圆心大于AC的长为半径画弧两弧相交于点MN作直线MN交BC于点D连接AD则∠BAD的度数为
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:把多余的用斜线\划掉.优题速享 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. StandontheplatformandpresentingthetopicHowtoProtectOurEarthIfeltconfident.SeveralweeksagowhenmyEnglishteacherannouncedthattherewouldhaveacompetitionIfeltsoexcited.Ibegintomakeagreatefforttoprepareforit.ForthisactivitystudentsshouldspeakonthebehalfofdifferentmemberoftheUnitedNations.AfterclassIimmediatelyinvitedmyfriendLucyformagroup.OverthefollowingweeksweburiedusintheschoollibrarytogatherbackgroundinformationaboutpollutionandthemeasureswhatFinlandhadtakentoprotecttheenvironment.Atfirstwefeltsoconfusingintheseaofinformation.Howeverastimepassedwegradualgotaclueabouthowtowritetheproposal.Thiscompetitionhasbroughtmuchjoytome.
8分VijayGuptaisknowntoclassicalmusicloversacrosstheUnitedStates.HeservesasfirstviolinistfortheLosAngelesPhilharmonic.Inthatjobheoftenplaystolargecrowdsincludingmanyveryrichpeople.Whenheisnotperformingheorganizesconcertsforhomelesspeople.TheyhaveremindedmewhyIbecameamusicianhesaid. LastweekGuptawasrecognizedforbeingafounderandtheartisticdirectorofStreetSymphony.Thegrouphasperformedathomelesssheltersjailsandhalfwayhousesforabouteightyears.Guptaisamongthe25winnersofthe2018MacArthurFellowshipcommonlyknownasthegeniusgrant.Eachwinnerwillreceive﹩625000overfiveyearstouseastheywish.ThemoneyiscomingfromaprivategrouptheJohnD.andKatherineT.MacArthurFoundation.Itawardsgrants补助金topeoplewhoseworkitconsidersexceptionalandthatinspireshopeinusall.GuptasaidhegottheideaforStreetSymphonywhileteachingNathanielAyersatrainedmusicianwhosementalillnessledtohomelessness. The31﹣year﹣oldgrantwinnersaidhedoesnotknowyethowhewillspendthemoney.Hehasbeenaperformersinceagesevenandtheawardwillgivehimspacetobreatheplanandlookahead. AnotherwinnerisRebeccaSandefuranassociateprofessorofsociologyandlawintheUniversityofIllinois.TheAssociatedPresssaysherresearchactivelysupportsnewwaystoinvolvepoorcommunitiesintheU.S.justicesystem. 47﹣year﹣oldSandefurcreatedthefirstnationalmappingofcivillegalaidproviders.Itshowswhichstateshadthefinancialresourcestoprovidesuchaidandwhichdidnot.Shealsofoundthatthecostoflegalservicesisonlyoneofthethingspreventingpoorpeoplefromgettinglawyers.Amongtheothersarefearsaboutunfairnessinthelegalsystem.Sandefurnotedthatalotofattentionhasbeenpaidtoproblemswiththecriminaljusticesystembutmoreattentionmustbepaidtothecivilsideofthelawwhichalsoaffectsmillionsofpeople. 1WhydidGuptawintheaward? A.Forhisachievementsinclassicalmusic. B.Forperformingforlargecrowds. C.Fororganizingagroupplayingforthehomeless. D.ForthefriendshipwithNathanielAyers. 2WhatdoweknowaboutMacArthurFellowship? A.Itisfoundedbythegovernment. B.Itoffers﹩625000to25winnersin2018. C.Itallowsthewinnerstousethemoneyfreely. D.Itawardspeoplewhomakegreatcontributionstosociety. 3WhatwastheextraordinarythingthatSandefurdid? A.Shemadeiteasiertogetlegalhelpforthepoor. B.Shemadethelegalsystemfairer. C.Shepaidmoreattentiontothecriminaljusticesystem. D.Sheofferedlegalaidstothepoorfreely. 4Whichcanbethebesttitleforthepassage? A.Grantswinnersinspiringthepoor B.Thecityhomelessinneedofhelp C.VijayGuptaanextraordinaryviolinist D.MacArthurFoundationawardingexceptionalwork
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