首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
在数列{an}中,记P(n)=|a1-a2|+|a2-a3|+…+|an-1-an|(n∈N且n≥2). (Ⅰ)若对任意的n∈N且n≥2,都有P(n)≤an-a1,则称数列{an}具有性质P. ...
查看本题答案
包含此试题的试卷
高三下学期数学《》真题及答案
点击查看
你可能感兴趣的试题
在数列{an}中a1=3an+1-2an-2=2n∈N.*则该数列的前2016项和是.
在数列{an}中已知a1=2an+1=4an-3n+1n∈N*.1设bn=an-n求证:数列{bn}
在数列{an}中a1=23a1+a2++an=n+2ann∈N*则an=.
在数列{an}中a1=-3an=2an-1+2n+3n≥2且1求a2a3的值2设证明数列{bn}是等
已知数列{an}的前n项和为Sn且Sn=2an-2n∈N.*在数列{bn}中b1=1点P.bnbn+
在数列{an}中若a1=1an+1=an+2n≥1则该数列的通项an=________.
在数学中为了简便记=1+2+3+···+n-1+n.1!=12!=2×13!=3×2×1···n!=
在数列{an}中a1=1an+1-an=2n+1则数列的通项an=________.
在数列{an}中a1=1a2=2an=-1n·2an-2n≥3n∈N.*其前n项和为Sn.1a2n+
在数列{an}中a1=3an=2an﹣1+n﹣2n≥2且n∈N*1求a2a3的值2证明数列{an+n
在数列{an}中a1=2an+l=an+cnn∈N*常数c≠0且a1a2a3成等比数列.I.求c的值
在数列{an}中S.n是它的前n项和且S.n=n2+n在数列{bn}中b1=1b2=3且bn+2=4
在数列{an}中已知a1=1an+1=-记Sn为数列{an}的前n项和则S.2014=_______
在数列{an}中a1=2an+1=4an-3n+1n∈N.*.1求证数列{an-n}是等比数列2求数
在数列{an}中若a1=1an+1=an+2则该数列的通项an=________.
在数列{an}中若a1=1an+1=2an+3n∈N.*则数列{an}的通项an=________.
在数列{an}中a1=1an+1﹣an=2n则数列的通项an=.
在数列{an}中已知a1=2a2=3当n≥2时an+1是an·an-1的个位数则a2010=____
在数列{an}中a1=1a2=3an+2=3an+1﹣kank≠0对任意n∈N*成立令bn=an+1
已知数列{an}的前n项和为Sn且Sn=2an﹣2n∈N*在数列{bn}中b1=1点Pbnbn+1在
热门试题
更多
8分WecanvideochatwithastronautsaboardtheInternationalSpaceStationandwatchlivefootagefromthefrozenheightsofEverest.Butcommunicatingwithasubmarine潜艇oradiverisnotsoeasy.Thelackofpracticalmethodsforsharingdatabetweenunderwaterandairbornedeviceshaslongbeenafrustrationforscientists.Thedifficultystemsfromthefactthatradiosignalsworkperfectlyinairtravelbutpoorlyinwater.Sonar声呐signalsusedbyunderwatersensorsreflectoffthesurfaceofthewaterratherthanreachingtheair. NowresearchersatMIThavedevelopedamethodwiththepotentialtorevolutionizeunderwatercommunication.Whatwe'veshownisthatit'sactuallyfeasibletocommunicatefromunderwatertotheairsaysFadelAdibaprofessoratMJT'sMediaLabwholedtheresearch. TheMITresearchersdesignedasystemthatusesanunderwatermachinetosendsonarsignalstothesurfacemakingvibrations震动correspondingtothelsandOsofthedata.Asurfacereceiverthenreadsanddecodesthesetinyvibrations.TheresearcherscallthesystemTARF.Ithasanynumberofpotentialreal﹣worldusesAdibsays.Itcouldbeusedtofinddownedplanesunderwaterbyreadingsignalsfromsonardevicesinaplane'sblackboxanditcouldallowsubmarinestocommunicatewiththesurface. Rightnowthetechnologyislow﹣resolution.TheinitialstudywasconductedintheMITswimmingpoolatmaximumdepthsofaround11or12feet.ThenextstepsfortheresearchersaretoseeifTARFisworkableatmuchgreaterdepthsandundervaryingconditions﹣highwavesstormsschoolsoffish.Theyalsowanttoseeiftheycanmakethetechnologyworkintheotherdirection﹣airtowater. Ifthetechnologyprovessuccessfulinreal﹣worldconditionsexpecttextingwhiledivingtobethelatestunderwaterfashion. 1WhatdoestheauthormainlytalkaboutinParagraph1? A.Thefutureofvideochatunderwaterandinair. B.Thefrustrationsofdevelopingunderwaterdevices. C.Thedifficultyofcommunicationfromwatertoair. D.Thecurrentsituationofcommunicatingwithasubmarine. 2Whatdoestheunderlinedwordfeasiblemean? A.Achievable. B.Convenient. C.Changeable. D.Alternative. 3WhatdoweknowaboutTARF? A.Itiswidelyusedtofinddownedplanes. B.Itcanworkwellatgreatdepthsunderwater. C.Itisanunderwatermachinethatsendssignals. D.Itcansendreceiveandreadsignalsfromunderwater. 4Whatisthebesttitleforthetext? A.TheReal﹣worldUsesofSonarTechnology B.FullWater﹣to﹣airCommunicationClosertoReality C.ABreakthroughintheApplicationofVideoChat D.TARFBecomingaNewMeansofCommunication
某探究小组为了研究小车的直线运动用自制的“滴水计时器”计量时间.实验前将该计时器固定在小车旁如图甲所示.实验时保持桌面水平让小车在外力的作用下运动一段时间滴水计时器等时间间隔地滴下小水滴图乙记录了桌面上连续6个水滴的位置及它们之间的距离.已知滴水计时器从滴出第1个水滴开始计时到滴出第26个水滴共用时10s.结果均保留两位有效数字. 1水滴从滴到位置1至滴到位置6用时s 2小车运动过程的加速度大小为m/s2水滴滴到位置5时小车的速度大小为m/s.
8分Plasticisusedtomakealargenumberofproductsweuseeverydaysuchasdrinkandfoodcontainerstrashbagsandgrocerybagscupsandchildren'stoysandbottlesforeverythingfrommouthwashandshampootoglasscleaneranddishwashingliquid.Andthat'snotevencountingalltheplasticthatgoesintofurnitureappliancescomputersandautomobiles. Astheuseofplastichasincreasedovertheyearsit'sbecomealargepartofAmerica'ssolidwaste﹣growingfromlessthan1percentin1960tomorethan13percentin2017.AsanexampleofhowandwhyplasticwasteisincreasingtheInternationalBottledWaterAssociationreportsthattheUSconsumed9.67billiongallonsofbottledwaterin2017comparedto9.1billiongallonstheyearbefore.TheUnitedStatesistheworld'sleadingconsumerofbottledwater.Agoodfirststepinreducingplasticwasteisswitchingtoareusablewaterbottle. Recyclingplasticreducestheamountofenergyandresources资源neededtocreateplastic.Researchshowsthatabottleofwaterrequiresabout2000timesasmuchenergytoproduceasthesameamountoftapwater.Recyclingplasticproductsalsokeepsthemoutoflandfills垃圾填埋andallowstheplastictobereusedinmakingnewproducts.Recycling1tonofplasticsaves7.4cubicyardsoflandfillspace.Andlet'sfaceitalotofplasticendsupdirectlyintheenvironmentbreakingdownintotinypieces?pollutingoursoilandwater. Today80percentofAmericanshaveeasyaccesstoaplasticrecyclingprogram.Auniversalnumberingsystemforplastictypesmakesiteveneasier.AccordingtotheAmericanPlasticsCouncilmorethan1800USbusinesseshandleplasticwaste.Inadditionover200000grocerystoresnowserveasrecyclingcollectionsitesforplasticwaste. 1Whatmessagedoesthefirstparagraphmainlyintendtoconvey? A.Plasticproductsarequitecommon. B.Plasticiswidelyusedinourdailylife. C.Whatfunctionsplastichas. D.Whyhumansmakeuseofplastic. 2Accordingtoparagraph2. A.plasticwasteisontheriseinAmerica B.Americanspreferbottledwatertotapwater C.plasticwasteistheleadingtypeofwasteinAmerica D.usingreusablewaterbottlesdoesn'thelpreduceplasticwaste 3Whatbenefitdoesrecyclingplasticmainlybring? A.Ithelpscutdownonpollution. B.Ithelpstomakesoilmorerich. C.Itmakesplasticeasilybrokendown. D.Itproducesnewenergyandresources. 4Whatdothefigureslistedinthelastparagraphsuggest? A.Americanssufferalotfromplasticwaste. B.Americansaregoodatrecyclingplastic. C.RecyclingplasticisconvenientintheUS. D.RecyclingplasticbringsgreatprofitsintheUS.
高铁酸钾K2FeO4是一种新型高效多功能水处理剂.K2FeO4为紫色固体微溶于KOH溶液.K2FeO4具有强氧化性在酸性或中性溶液中迅速产生O2在碱性溶液中较稳定.某学习小组设计了下面的实验制备K2FeO2并探究其性质. 一K2FeO4的制备 该小组用如图所示装置制备K2FeO4夹持装置略. 1以上装置图中有一处明显的错误请你帮助指出来.B中应盛装的试剂是. 2写出A中发生反应的离子方程式. 3C中发生的反应有Cl2+2OH﹣=Cl﹣+ClO﹣+H2O还有生成K2FeO4的反应.写出得到紫色固体K2FeO4的化学方程式. 二性质探究 用KOH溶液充分洗涤C中所得固体得到固体物质K2FeO4. 4絮凝实验甲同学取少量K2FeO4加入浑浊的泥浆水中发现产生气体搅拌浑浊的泥浆水很快澄清.请结合方程式说明K2FeO4的净水原理. 5乙同学取少量K2FeO4向其中滴入稀盐酸发现产生黄绿色气体.产生黄绿色气体的原因可能是. 6丙同学取少量K2FeO4向其中滴入MnSO4和适量H2SO4的混合溶液振荡后溶液呈紫色丙同学认为氧化性FeO42﹣>MnO4﹣.请你设计一个实验验证丙同学的结论是否正确.
下列说法正确的是
下列图示是从海带中提取碘的有关操作其中错误的是
以下说法正确的是
下列说法正确的是
15分Peoplewithcolourblindnesscan'tseecoloursinanormalway.Colourblindness1affectapproximately1in12menand1in200womenintheworld. Therearevariouscausesofcolourblindness.Forthemajorityofcolour﹣blindpeople?theconditionissomethingtheyhavefrom2bearalthoughsomepeoplegetitlaterinlifebecauseofdiseases. Mostcolour﹣blindpeoplecanseethingsasclearlyasotherpeoplebut3areunabletofullyseeredgreenorbluelight.Therearedifferenttypesofcolourblindnessandthereareextremelyrarecases4peopleareunabletoseeanycolouratall.The5commonformofcolourblindnessisred/greencolourblindness.Although6knowasred/greencolourblindnesstheformofcolourblindnessdoesn'tmeansufferers7meremixupredandgreen.Itmeanstheymixupall8colourthathavesomeredorgreenaspartofthewholecolour. Theeffects9colourblindnesscanbemildmoderate中等的orsevere.Approximately40%ofcolour﹣blindpeopleareevenunawarethatthey'recolour﹣blind.Statistically10speakmostpeoplewithamoderateformofred/greencolourblindnesscanonlyidentify5colouredpencilsfromastandardboxof24pencilcrayons.
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A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II处起不计分. Lastweekendlwentfishingwithmycousinsbyariverwherewastwomilesawayfrommyhomebybike.Whenwewereabouttoreturnforhomewefoundoneofourbikelost.Wewerereallynervousthen.Askingaboutthelostbikenobodytoldthetruthexceptme.Andtomysurprisemyparentsdon'tscoldme.Insteadtheysaidlwasahonestboy.Ihavebenefitedgreatfrommyfamilyrules.I'mnotthebestatschoolworkbutclassmatestrustmeandnearlyeveryoneiswillingtomakingfriendswithme.IthelpsmeknowbetteraboutHonestyisthebestpolicy.
Curiousaboutwhatbookswillbepublishedinthemonthsaheadsoyoucanpre﹣orderorreservethem?Pleasenotewehavenotincludedeverybookthatiscomingoutbutrathersomethatcaughtoureyes﹣andthatwethoughtshouldcatchyoursaswell. TheBigBraveAdventurousLifeofLaviniaWarrenbyElizabethRaum LaviniaWarrenneverletherheightpreventherfromleadingafullandadventurouslife.Althoughshenevergrewthreefeettallshebecameabelovedteacheraworldtravelleranentertainerandthefriendofmanypowerfulfigures.Laviniafacedseveraltragedies悲剧butalwaysfoundthestrengthtogoon.Lavinia'sextraordinarystoryalsoprovidesasocialhistoryofoneofthemostdifficultperiodsinAmericanhistory. TheDollhouseMurdersbyBettyRenWright Amyisterrified.Shehearsnoisescomingfromthedollhouseintheattic阁楼andthedollsshewasplayingwitharen'twheresheleftthem.EverynightwhenAmygoesuptocheckonthedollhouse?thedollshavemovedagain!SecretsbecomeclearasAmygetsclosertoshowingthemystery迷ofthedollsinthisnovelthatcombinescomplicatedfamilyrelationshipswithamystery. TheGirlintheLockedRoombyMaryDowningHahn Afamilymovesintoanoldabandonedhouse.Jules'parentslovethehousebutJulesisfrightenedandfeelsasenseofwarning.Whensheseesapalefaceinanupstairswindowthoughshecan'thelpwonderingaboutthepresenceonthetopfloor.ThenJulesisdeterminedtocontactthemysteriousfigureandhelpunlockthedoor.Pastandpresentintersect交叉assheandherghostlyfrienddiscoverthesecretofthefamilywholivedinthehouseallthosemanyyearsago. 1WhatmakesLaviniaWarrenimperfect? A.Herheight. B.Hershape. C.Herstrength. D.Hercharacter. 2WhatcanwelearnfromTheDollhouseMurders? A.Amyisfrightenedwhenhearingnoisesintheattic. B.Amycaresmorefordollsthananythingsheeverhas. C.Amyfindsittoughtosleepwithoutdolls'company. D.Amywillknowlittleaboutherfamilyrelationships. 3WhathappenswhenJulesseesapaleface? A.Shedarenottellherparentsallthatshesees. B.Sheremindsherparentsofthedangeratonce. C.Shemakesuphermindtohelpherfriendout. D.Shewantstoknowwhatexistsonthetopfloor.
如图所示abc为匀强电场中一条直线上的三点ab=bc=l一个帶电荷量为q的负点电荷在大小为F的电场力的作用下以某一初速度从a点运动到c点的过程中电势能增大W则
30分GreenbergwasaluckyguytoenterColumbiaUniversityonfullscholarship.ButjustbeforejunioryearGreenberg's1changed.Onedayhisvision2upandlaterhewasdiagnosed诊断withglaucoma青光眼.ThendoctorsoperatedonGreenberg'seyes.3thesurgerydidn'twork.Greenbergwasgoingblind.Hewasso4thatherefusedtoseeanyone. AsGreenberg'sbestfriendArthurpersuadedGreenbergtogobacktoColumbiaand5tobehisreader.Arthurread6tohimeverydaytakingtimeoutfromhisownstudyandGreenberg7scoringstraightA's.Stillhewas8aboutgettingaroundaloneandreliedonhisfriend. ThenoneafternoonGreenbergandArthurwenttoMidtownManhattan.WhenitwastimetogobacktocampusArthursaidhecouldn't9himbecauseofanappointment.Greenberg10TheyarguedandArthurwalkedoff11GreenbergaloneinGrandCentralTerminal. Greenbergwhowascompletely12stumbled蹒珊throughtherush﹣hourcrowd.HetookashuttletrainwesttoTimesSquareandthentransferredtoanuptowntrain.Fourmileslaterhe13attheColumbiaUniversitystop. Attheuniversity'sgatessomeone14him.Oopsexcusemesir.Greenberg15thevoice.ItwasArthur's.Greenberg'sfirstreactionwas16butinthenextsecondherealizedwhathehadjust17﹣andrealizedtoowhohadmadeitpossible.18Arthurhadbeenwithhimthewholewayusingoneofthemost19strategies. Blindnessdoesn'tmakeGreenbergfailtoappreciatethe20oflife.Healwayssaysheistheluckiestmanintheworld. 1A.faith B.attitude C.fortune D.reputation 2A.lit B.steamed C.cleared D.cheered 3A.Otherwise B.Moreover C.Therefore D.However 4A.shy B.desperate C.selfish D.nervous 5A.offered B.pretended C.happened D.learned 6A.letters B.newspapers C.textbooks D.magazines 7A.endedup B.carriedon C.imagined D.considered 8A.curious B.confident C.excited D.tentative 9A.abandon B.rescue C.comfort D.accompany 10A.compromised B.panicked C.explained D.apologized 11A.leaving B.finding C.consulting D.serving 12A.tired B.amused C.confused D.satisfied 13A.gotoff B.pulledover C.lookedaround D.ranaway 14A.turnedto B.shoutedat C.knockedinto D.quarreledwith 15A.raised B.lost C.controlled D.recognized 16A.anger B.pleasure C.relief D.sorrow 17A.missed B.questioned C.ignored D.achieved 18A.Gradually B.Finally C.Obviously D.Strangely 19A.brilliant B.familiar C.defensive D.complex 20A.magic B.beauty C.wisdom D.truth
在磁感应强度为B的匀强磁场中一个静止的放射性原子核X发生了一次α衰变.放射出的α粒子He在与磁场垂直的平面内做圆周运动其轨道半径为R.以mq分别表示α粒子的质量和电荷量生成的新核用Y表示.下面说法正确的是
用n轰击U产生了m个某种粒子核反应方程为U+n→Xe+Sr+mX.则
某兴趣小组用如图甲所示的实验装置来测物块与斜面间的动摩擦因数.PQ为一块倾斜放置的木板在斜面底端Q处固定有一个光电门光电门与数字计时器相连图中未画.每次实验时将一物体其上固定有宽度为d的遮光条从不同高度h处由静止释放但始终保持斜面底边长L=0.500m不变.设物块与斜面间的动摩擦因数处处相同 1用20分度游标卡尺测得物体上的遮光条宽度d如乙图所示则d=cm 2该小组根据实验数据计算得到物体经过光电门的速度v并作出了如图丙所示的v2﹣h图象其图象与横轴的交点为0.25.由此可知物块与斜面间的动摩擦因数μ= 3若更换动摩擦因数更小的斜面重复上述实验得到v2﹣h图象其图象的斜率将填“增大”“减小”或“不变”.
Createdin1998byCaseyandShelleyBlacktheNorthernLightsWildlifeWolfCenterfocusesonnotonlyrescuingyoungabandonedwolvesbuteducatingthepublic.Unlikeothercentersyoucanactuallywalkwiththewolvesandhaveexcitinghands﹣oninteractionwiththemhere.Andsowegatheredonelatewintermorningtolearnprepareandwalk. ScrappyandFloraourwolvesthatdaywerebroughttothecenterwhenonlyafewdaysold.Theylivedinthehousewithusforthefirstseveralmonths.WetreatedthemlikehumanbabiesfedthemandsleptwiththemsaidShelley.Sotheyaretotallyusedtopeople.Howeverthesearewildanimals.ForthatreasonShelleyandCaseyexplainedthewalkistotallyonthewolf'sterms.Wedon'tapproachthembutiftheycomeuptouswecantouchthem. Withallthisinmindweheadedforthewoods.WewerewalkingonaloggingroadwhensuddenlyFloraall60poundsofherhurrieduptomeandraiseduponherlegs.Shewasalmostastallasme.Assheleanedinputherhugemuddypawsonmyshouldersandsniffedmyfaceapparentlyshewassayinghelloinwolftalk. WewalkedfarthermaybehalfamilewhileScrappyandFloradashedinandoutofthewoodsstoppingtooccasionallyrollinthesnowdigforthisorthatandjustplay.Thenweallheadedintothetreestoapicturesquestreamwherethewolvessplasheddrankandhadagreattime. Onecouldpointoutthatthiswholeadventurewasstagedandquiteartificial.ButthepurposeCaseyandShelleysaidistoexplainthewolves'placeintheenvironmentandprimarilytoletpeopleknowwolvesdon'thavetobeuniversallyfeared﹣theyreallydon'thidesecretlyinthewoodsjustwaitingtoeatpeoplebutthey'dratheravoidpeopleforthemostpart. 1HowistheNorthernLightsWildlifeWolfCenterdifferentfromothers? A.Ittrainsandeducateswildwolves. B.Itaimstorescueyoungabandonedwolves. C.Itraiseswolvesforcommercialpurposes. D.Itallowsvisitorstotakeawalkwithwolves. 2WhatcanbeinferredfromShelleyandCasey'sexplanationinParagraph2? A.Thewalkcanbepotentiallydangerous. B.Thewolveshavelostalltheirwildness. C.Peopleshouldgetclosetothewolvesactively. D.Thewolvescanreadpeople'smindlikehumanbabies. 3WhydidFlorabehavelikethatwhenshesawtheauthorontheloggingroad? A.Toexpresscuriosity. B.Toshowfriendliness. C.Toattractattention. D.Toseekcompanionship. 4WhydoCaseyandShelleyorganizesuchanadventure? A.Toadvertisethecenter. B.Topublicizewolfhunting. C.Topromoteenvironmentalprotection. D.Toclarifysomeconventionalviewsofwolves.
如图所示半径为R的光滑大圆环用一细杆固定在竖直平面内质量为m的小球A套在大圆环上.上端固定在杆上的轻质弹簧与质量为m的滑块B连接井一起套在杆上小球A和滑块B之间用长为2R的轻杆分别通过铰链连接当小球A位于圆环最高点时弹簧处于原长此时给A一个微小扰动初速度视为0使小球A沿环顺时针滑下到达环最右侧时小球A的速度为g为重力加速度.不计一切摩擦AB均可慢为质点则下列说法正确的是
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仅限一词 2.只允许修改10处多者从第11处起不计分. LastmonthourclassorganizedahikingalongtheChaobaiRiverwhichrunthroughHebeiBeijingandTianjin.MuchtomydisappointIfoundtheriverwasseriouspolluted.AtthatmomentIwasdeterminedtodowhatIcouldprotectit.Firstundermyteacher'shelpIusedtheequipmentsfromtheschoollabtotestthequalityoftheriverwater.ButthenIusedthedataIhadcollectedittoanalyzethepollutionofthewater.FinallyIwriteareportonthepollutionoftherivertothelocalgovernment.IalsogaveapresentationinclasswhereIsuggestedthatwemustmakesmallchangestoprotectourwaterresources.
30分WhenCharlesBarkley'smotherpassedawayBarkley'shometowncametothefuneral.Butan1guestalsocame.Hewasn'tabasketballplayerorfromBarkley'shometown.More2hewasmydad﹣ascientist. Mydadsaidhe3aboutBarkleylongbeforehemethim.Wheneverwe4dinnerpartieshewouldtalkaboutBarkley.Basketballhasneverbeenmything.I5somekeywordsintoasearchengineto6somethingaboutBarkley.Heseemedprettyfamousand7notlikeanyonewhowouldbefriendswithmydad. Butthefriendshipwasreal. Mydad8madeaslideofphotosofhimandBarkleytogetherforourcommunity'sChineseNewYearparty﹣totallyirrelevanttothe9.Iaskedhimwhatmadethembecomefriends. AsanAsianintheU.S.wehadagood10hesaid.Weagreeonmanyviews. Theybelievedthecoloroftheirskindidn't11. ButonaSundayafternoonmydadpassedaway.Everyonewas12asBarkleyattended thefuneral.Itgivesmegreat13andjoytoknowIwasafriendofhisBarkleysaid.Justhearingabouthimatthe14whathehadachievedandwhathewastryingtohelpothers 15touchedmeI16hewouldbeknowntomanypeople. Atthefuneralpeople17memoriesofmydad.IrealizethatevenafterhepassedawayIwouldcontinueto18thingsabouthim. ThestoryofhisfriendshipwithBarkleywasnotjusta19withafamousperson﹣itthrewlightonthe20ofthisworld. 1A.frequent B.unexpected C.average D.unwelcome 2A.specifically B.importantly C.carefully D.strictly 3A.cared B.worried C.thought D.knew 4A.held B.organized C.attended D.arranged 5A.read B.forgot C.sent D.typed 6A.findout B.applyfor C.talkabout D.pickup 7A.potentially B.accidentally C.deliberately D.certainly 8A.still B.also C.even D.already 9A.experience B.holiday C.player D.friendship 10A.chance B.conversation C.argument D.choice 11A.bum B.differ C.matter D.shine 12A.astonished B.thrilled C.annoyed D.disappointed 13A.moments B.memories C.relief D.comfort 14A.meeting B.hometown C.party D.funeral 15A.accomplish B.contribute C.develop D.gain 16A.wished B.declared C.suspected D.confirmed 17A.improved B.refreshed C.shared D.lost 18A.spread B.leam C.obtain D.mourn 19A.connection B.coincidence C.phenomenon D.relationship 20A.benefits B.responsibilities C.possibilities D.varieties
25分假定你是李华你的新西兰朋友Terry没有进入学校唱歌比赛的决赛感到非常伤心.请你给他写一封email内容包括 1.表示安慰 2.给予鼓励 3.提出希望. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
室温时用0.100mol•L﹣1AgNO3溶液滴定50.0mL0.0500mol•L﹣1NaCl溶液的滴定曲如图所示[pCl=﹣lgCl﹣].下列有关描述错误的是
在真空中某点固定一个带负电荷的金属小球A可视为点电荷所带电量Q=1.0×10﹣5C在离它10cm处放置另一个带负电的检验电荷B以下描述正确的是
如图所示线圈abcd固定于分布均匀的磁场中磁场方向垂直线圈平面.当磁场的磁感应强度B随时间t变化时ab边受到的安培力恒定不变.则下列磁感应强度B随时间t变化的图象中可能正确的是
某人设计了如图所示的滑板个性滑道.斜面AB与半径R=3m的光滑圆弧轨道BC相切于B圆弧对应的圆心角θ=37°且过C点的切线水平C点连接倾角α=30°的斜面CD.一滑板爱好者连同滑板等装备视为质点总质量m=60kg.某次试滑他从斜面上某点P由静止开始下滑发现在斜面CD上的落点Q恰好离C点最远.若他在斜面AB上滑动过程中所受摩擦力Ff与位移大小x的关系满足Ff=90x均采用国际制单位忽略空气阻力取g=10m/s2sin37°=0.6cos37°=0.8.求 1PB两点间的距离 2滑板在C点对轨道的压力大小.
物质的结构性质和用途之间有着非常密切的关系.下列有关物质的性质与用途的因果对应关系错误的是
10分Makingabudgetcanbequiteasatisfyingprocess.Afterdrawingoneup?You'llprobablyfeelproudthatyou'vecontrolledyourfinances.Howeverdrawingupyourbudgetisn'tthemostimportanttaskwhenifcomestomanagingyourmoneysuccessfully.1. Ifyou'reoneofthemanypeopleinBritainwithmorethanonebankaccountusingseveralalongsideoneanothercouldhelpyoustayincontrolofyourspending.2.Thatcanhelpyouavoidoverspendinginasinglearea. 3keepaneyeonyouraccountseachmonth.Whetheryoureceiveyourregularbankstatementsandbillsthroughthepostoronlinemakesureyoucheckthem.Theycantellyouwhereyoumightbeoverdoingitandshouldinspireyoutocutbackimmediatelyifnecessary.Besidesyou'relikelytopickupanyproblemsastheyarise. Makinganoteofallyourspendingforafewweeksisanotherwaytocheckthatyourmoneyreallyisgoingwhereyou'dlikeitto.4butifyoutendtospendusingcashratherthanacreditcardyouwontbeabletotrackwhereyourmoneyisgoingsimplyfromlookingatyourbankstatementsandbills. Asyourpersonalcircumstanceschangeyourbudgetwillneedtobechangedtoo.5.Whileitmayseemlikeachancetoloosenupyourpursestringsslightlyfailingtotakeaccountofanincomeriseinyourbudgetcouldmeanyoudon'ttrulymakethemostofit. A.Ifyouwantyourbudgettostaybalanced B.It'lltakeafewmonthstogetusedtobudgeting C.Itmayseemtiresometowriteeverythingdown D.Divideupyourincomeeachmonthintoseparateaccounts E.Onceyou'velinkedallyouraccountsyoucancreateabudget F.Gettingapromotionorpayriseshouldmeanyouremakeyourbudget G.Thekeytoeffectivebudgetingisstickingtothespendingplanyou'vemade
工业废水中含有的Cr2O72﹣和CrO42﹣会对水体产生很大的危害因此这种工业废水必须净化处理.一种处理含铬废水的工艺流程如下 ①中反应为2CrO42﹣黄色+2H+⇌Cr2O72﹣橙色+H2O. 下列说法正确的是
如图所示带电小球a由绝缘细线PM和PN悬挂而处于静止状态其中PM水平地面上固定一绝缘且内壁光滑的圆弧细管道GH圆心P与a球位置重合管道底端H与水平地面相切一质量为m可视为质点的带电小球b从G端口由静止释放当小球b运动到H端时对管道壁恰好无压力重力加速度为g.在小球b由G滑到H过程中下列说法中正确的是
ABCDE是元素周期表中原子序数依次增大的前四周期元素.A与B同周期且A元素原子核外s能级有1个未成对电子B元素的原子核外p电子比s电子少1C元素的原子序数比B元素多1D元素的原子价电子有6个未成对电子它的一种化合物常用于检验酒驾E元素的原子价电子有4个未成对电子.请回答下列问题 1第一电离能介于A和B之间的同周期元素有填元素符号. 2B元素的最高价氧化物的水化物在水溶液中能完全电离电离所得阴离子的空间构型为.写出2种与该阴离子互为等电子体的微粒的化学式.画出基态D原子的价电子排布图. 3C元素对应的简单氢化物的沸点明显高于同族其他元素对应的简单氢化物其原因是. 4元素D可以形成的配合物如图1所示. ①该配合物中碳原子的杂化类型为. ②该配合物中所含化学键的类型不包括填字母. a.极性共价键b.非极性共价键c.配位键d.离子键e.金属键f.σ键g.π键 5元素E的单质和氮气在640℃可发生置换反应产物之一的晶胞结构如图2所示该反应的化学方程式为.若该晶体的密度是ρg•cm﹣3则两个最近的E原子间的距离为cm.用NA表示阿伏加德罗常数的值
热门题库
更多
高一下学期化学
高一下学期物理
高三下学期数学
高三上学期数学
高一下学期英语
教案备课库
高一上学期生物
高一下学期生物
高二上学期数学
高二上学期物理
高二上学期英语
高二上学期生物
高二下学期数学
高二上学期化学
高二下学期物理
高三下学期物理