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已知等比数列{an}的公比q>1,且a3+a4+a5=28,a4+2是a3,a5的等差中项.数列{bn}满足b1=1,数列{(bn+1﹣bn)an}的前n项和为2n2+n. (Ⅰ)求q的值; (...
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数列{an}是等差数列若a1+1a3+3a5+5构成公比为q的等比数列则q=________.
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如图所示甲为小型旋转电枢式交流发电机电阻为r=2Ω的矩形线圈在磁感应强度为B的匀强磁场中绕垂直于磁场方向的固定轴OO′匀速转动线圈的两端经集流环和电刷与右侧电路连接右侧电路中滑动变阻器R的最大阻值为R0=4Ω滑动片P位于滑动变阻器中点定值电阻R1=7ΩR2=2Ω其他电阻不计.从线圈平面与磁场方向平行时开始计时闭合开关S.线圈转动过程中理想交流电压表示数是10V图乙是矩形线圈磁通量随时间t变化的图象.则下列说法正确的是
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Forsomepeoplegoingtoamuseumisanenjoyableexperience.1Howtomakemuseumsandtheirlifelesshistoricalcollectionsmoreappealing?Thisisatoughquestionthatisworthstudying. NationalTreasureaculturalexplorationprogrammewhichbegantoaironChannel3ofCCTVonDec.32017maybeagoodanswer.2. Theshowusescreativewaystoarouseinterestinthecollectionsmuseumshold.ItpresentstreasuresthroughdifferentartisticmethodsandfullyexplainsthestoriesandhistorybehindeachculturalrelicsothataudiencescannotonlyunderstandhowtoappreciatethebeautyofculturalrelicsbutalsoknowthecivilizationtheycarryandthespiritofChineseculturepreservedovertheyears.3. Theshowusesdifferentmethodsincludingdramaticperformancesanddocumentary﹣stylestorytellingtoshowthebackgroundstoriesofseveralnationaltreasures.4Whileexplainingthemysteriesbehindthetreasures.thenationaltreasurekeeperseitherfamouspeopleorordinarypeoplealsotelltheirownstories. 5ThepopularityofMastersinForbiddenCity我在故宫修文物a2016documentaryfeaturingtheForbiddenCity'sculturalrelicsencouraged15000collegestudentstoapplytoworkatthePalaceMuseumlastyear.TheshowNationalTreasurewilltouchmillionsofpeople'sheartsandencouragemorepeopletovisitmuseums. A.Forothers.it'sjustseveralhoursworthofyawning. B.Eachtreasureispresentedbyanationaltreasurekeeper. C.Itisanexcellentexampleofmakingancientrelicsalive. D.HongKongactorTonyLeungforexampleisoneofthekeepers. E.Watchingtheshow.youjustcanthelpbeingproudofChineseculture. F.Museumsaretreasurehousesthatgiveunderstandingintodifferentcultures. G.Actuallyshowspromotingtraditionalrelicshavebecomemorepopularrecently.
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Eveniftreescannotwalktheyarestillonthemove. InpartsoftheArcticentireforestsaremovingnorthward.AcrosstheArctictemperaturesarerisingfasterthananywhereelseintheworld.Asthathappensthetreelinethatmarkswhereforestsstopandthetreelesstundra冻原startshasbeenshiftingnorthward.Treesgrowingalongthetreelinemustprotectthemselvesfromthecoldwind.Todothisplantstendtogrowhorizontal水平的brancheslowtotheground.Theenergyittakesfortreestogrowthiswaymeanstheydonthaveenoughenergytomakeseeds ButasEarthsclimatehasbeenwarming.treesnolongerhavetojustgrowhorizontally.Manycaninsteadgrowuptowardthesky.Thistakeslessenergy.Andwithallthatleftoverenergythesetreeshavestartedproducingmoreseeds.Thishappensespeciallyinplaceswherewhitespruce白云杉grows. WhitesprucewhichisaNorthAmericantreeisquiteabletoproducealotofseedswhichcanmovelongdistancesinthewind.Whenwind﹣blownseedsenduponthetundrabeyondthetreelinetheyeventuallycansprout发芽newtrees.Thisexplainshowaforestcanmove.Ofcoursetheprocesswouldworkonlyifthetundrawerewarmenough.Butinrecentyearsthewholeplanethasbeenwarming. Newtreeswillprovidesheltersforsomesnowkeepingthesunsraysfrommakingthewhitesurfacedisappear.Insteadthetreesabsorbthesunsheat.Thiswarmsthesurroundingair.Theextrawarmthencouragesevenmoretreestoproduceseeds.Thatfurtherboostsaforestsabilitytoexpand.Inadditionmoretreeswilltrapmoresnowpreventingmuchofitfrombeingblownaway.Snowcantrapheatinthesoilbelowwhichencouragestreestogrow.Therecentriseoftemperatureshashelpedmoretreesgrowpastthetreeline.Peopleworryaboutimpactsontheanimalsthatdependonfrozenconditionsforfoodandshelter. 1WhatisthemaincauseofthetreesintheArcticmovingnorthward? A.Thehighertemperature B.Theabundantresources C.Thefierceandcoldwind D.Theshrinkingofnortherntundra 2WhatdoestheunderlinedwordthisinParagraph2mean? A.Toproducemoreseed B.Toresistthecoldwind C.Tomovenorthward D.Torespondtotheclimatechange 3Whatcanbeinferredfromthelastparagraph? A.Newtreescantrapthesnowwhichmaymakethesoilcolder B.Thetrappedsnowpreventsnewtreesfromproducingmoreseeds C.Newtreescanmakethesurroundingairwarmer. D.Newtreescanbringmorefoodandsheltertolocalanimals. 4Thepassageismostprobablytakenfrom. A.asciencereport B.anagriculturereport C.asciencefictionmagazine D.anastronomymagazine
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Wheneveryoufeelcold.thefirstthingyoudoistoputonmoreclothes.Butitcanhappenthatyoucanfeelcolderwhenyougooutsidewiththesameamountofclotheson1youdoindoorsWhyisthis? AccordingtoTheConversationthereason2lieincoldreceptors接收器intheskin.Whenthetemperaturedrops.thesereceptorssend3signaltotellthebrainthebodytemperature.Thenbraincreates4awareoffeelingcold. 5wearmoreclothesathomeleadstoaveragebodytemperaturebeingraised.Thenthereceptorssendthebrainthesignalofa6hightemperature.Howeverwhenyougooutsideyournervoussystemlearnsthetemperature7yourskin.inparticulartheface.Asaresultthedifferenceintemperatureisnowgreaterandyoufeeltheairiscolderparticularlyonthe8exposeskin. 9accordingtoTheSun.onceyougetoveryourinitialsenseofcoldnessyourcoatwillstilldoitsjobandyou10feelitsbenefit.
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