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如图,将线段AB先向右平移5个单位,再将所得线段绕原点按顺时针方向旋转90°,得到线段A′B′,则点B的对应点B′的坐标是( )
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在平面直角坐标系中将点3-2先向右平移2个单位长度再向上平移3个单位长度则所得的点的坐标是.
将线段AB在坐标系中作平行移动已知A﹣12B11将线段AB平移后其两个端点的坐标变为A′﹣21B′0
向上平移了1个单位长度,向左平移了1个单位长度
向下平移了1个单位长度,向左平移了1个单位长度
向下平移了1个单位长度,向右平移了1个单位长度
向上平移了1个单位长度,向右平移了1个单位长度
已知线段AB平行于x轴且点A在点B的左侧AB=2点A的坐标为1﹣1将线段AB先向上平移3个单位再向
将函数的图象先向右平移个单位然后向下平移2个单位后所得的函数解析式为________________
将直线y=3x绕原点逆时针旋转90°再向右平移1个单位所得到的直线方程为______________
将线段a向右平移m个单位得到线段b将线段b向左平移n个单位n>m得到线段c.如果直接将线段a平移到
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向左平移n+m个单位
向左平移n﹣m个单位
如图已知线段AB与射线BC垂直AB=2.把线段AB向右平移3个单位长度则线段AB扫过区域的面积是
3
4
5
6
在如图所示的平面直角坐标系内画在透明胶片上的▱ABCD点A.的坐标是02.现将这张胶片平移使点A.落
如图在平面直角坐标系中ABC的顶点的坐标分别为A﹣15B﹣11C﹣31.将△ABC向右平移2个单位再
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ChangeyourlifearoundinfoureasystepsChangeyourwayofthinkingYourhomeenvironmenthasnodoubtinstilled灌输certainexpectationsinyouabouthowyourlifeshoulddevelop.1.dependingonyourbackground.Tochangeyourlifearoundstartbyshakingoffsuchexpectationsandsettingyourselfsomenewgoals.2Askyourselfwhatyoureallywantoutoflife.Makealistofideasaboutyourcareermoneypeopleyoulovethingsyou'dliketodoetc.Studyitsoastodecidewhichthreeitemsarethemostimportanttoyou.3.It'sunrealistictoimaginedoingso.Butbyconsciouslychoosingthreespecificgoalsyouwillbeamazedathowmuchmorefocusedanddeterminedyoufeel.OvercomeyourdoubtsConfidenceiseverything.Allthesameacertainamountoffearanduncertaintyisnatural.4.andremainfocusedonyourgoal.Althoughyoumaybeshakingontheinsideshowoutwardconfidenceandbelieveinyourself.Learntovieweveryobstacleasachance.Ifatfirstyoudon'tsucceed﹣﹣Weareallafraidoffailing.Bethatasitmayfailureisanimportantpartofsuccessandyouneedtoholdontothatfactandseesetbacksassteppingstonestowardsyourfinalgoal.5.youshoulduseyourmistakesaslearningtoolsandmoveon.A.LimityourtimeB.PracticehidingitC.FocusyoureffortsD.DifficultthoughitmayseematthetimeE.HoweverthesemaylimityouorbemisleadingF.Rememberit'snevertoolatetolearnsomethingnewG.Howevermuchyou'dliketoachieveeverythingonyourlist
SmallincreasesintemperaturefoundtoaddpowertostormsintheAtlantic.HurricanesthatformintheAtlanticOceanareexpectedtogainconsiderablestrengthastheglobaltemperaturecontinuestoriseanewstudyhasfound.UsingmodelingdatafocusedontheconditionsinwhichhurricanesformagroupofinternationalresearchersbasedatBeijingNormalUniversityfoundthatforevery1.8°F1℃riseoftheEarth'stemperaturethenumberofhurricanesintheAtlanticthatareasstrongorstrongerthanHurricaneKatrinawillincreasetwofoldtosevenfold.Hurricanestrengthisdirectlyrelatedtotheheatofthewaterwherethestormforms.Morewatervaporintheairfromevaporatingoceanwateraddsfueltohurricanesthatbuildstrengthandheadtowardland.HurricaneKatrinaiswidelyconsideredthemeasureforadestructivestormholdingthemaximumCategory5designationforafull24hoursinlateAugust2005.ItloststrengthasitpassedovertheFloridapeninsulabutgaineddestructivepowerfightbeforecollidingwithNewOrleanskillingmorethan200peopleandcausing﹩80billionindamage.ThestudypointstoagradualincreaseofKatrina﹣likeevents.Thewarmingexperiencedoverthe20thcenturydoubledthenumberofsuchdebilitating将人类摧垮的storms.Buttheongoingwarmingoftheplanetintothe21stcenturycouldincreasethefrequencyoftheworstkindsofstormsby700percentthreateningcoastlinesalongtheAtlanticOceanwithmuitipleCategory5stormseveryyear.'Ourresultssupporttheideathatchangesinregionalseasurfacetemperaturesistheprimarycauseofhurricanevariability'saidAslakGirnsteadaresearcherwiththeCenterforIceandClimateattheUniversityofCopenhagen.Thelargeimpactofsmallsea﹣surfacetemperatureincreaseswasmorethanGirusteadandhiscolleagueshadanticipated.TheentirestudywaspublishedintheProceedingsoftheNationalAcademyofSciences.Globaltemperatureshavesteadilyincreasedmakingthepastdecadethewarmestonrecord.EarlierthisyearclimateresearchersreportedthattheEarth'stemperatureshaverisenfasterinthelastcenturythanatanypointsincethelasticeage11300yearsago.Theprimarycauseacouseususofscientistshassaidistherisingemissionsofgreenhousegaseslikecarbondioxideandmethane.Pasthurricaneshavesupportedthestudy'sfindingthatglobaltemperatureriseislinkedtomoredestructivestorms.AccordingtotheNationalCenterforAtmosphericResearchwhilethefrequencyofstormsdoesn'tappeartohaveincreasedthepercentageofstrongoneshasrisensharplyoverthepastfewdecades.Thetrendmaybesimilarfurtherbackintimebutcomprehensivehurricanedatadoesn'texist.1AccordingtotheteamofinternationalresearchersbasedatBeijingNormalUniversitytheriseoftheEarth'stemperatureislikelytocause.A.thecomingoficeageB.lessintensehurricanesC.moreKatrina﹣likeorworsehurricanesD.moregreenhousegasesintheatmosphere2Theoceanwaterintheregionwherethestormforms.A.isheatingthehurricanesB.evaporatesandbecomesfuelC.headstowardlandD.turnsintowatervaporthatmakeshurricanesstronger3Whatresultcanregionalseasurfacetemperaturechangesproduce?A.Hurricanechanges.B.Increasinggreenhousegasemissions.C.Globalwarming.D.Destructivehurricanes.4Itcanbeinferredfromthepassagethat.A.thereisnolinkbetweengreenhousegasemissionsanddestructivestormsB.reductionofgreenhousegasemissionsmayreducedestructivestormsC.thehigherpercentageofstrongonesroseasmorehurricanesappearedD.pastrecordsonhurricanesincludedeverythingneeded
Asmallstudyofprofessionalsoccerplayersfoundthateventhosewhohaveneverexperiencedaconcussion脑震荡stillhavechangesinthewhitematteroftheirbrainsprobablyfromroutineandunprotectedheaders头球.Thebrain'swhitematterismadeupofnervesandtheirmyelin髓磷脂protectivecoatingthatplayanimportantroleinconnectingbrainareasandsettingupnervousnetworks.PreviousstudieshaveinvestigatedhowconcussionsleadtochangesinthiswhitematterbutanewstudyledbyDr.IngaK.KoerteofHarvardMedicalSchoolinBostonisoneofthefirsttolookathowevenblowstotheheadthataren'tconsideredconcussionsmayleadtobraininjury.InthestudytheresearcherscomparedbrainscansoftwelvemalesoccerplayersfromGermantop﹣levelsoccerclubswhohadnotexperiencedaconcussiontobrainscansofelevencompetitiveswimmerswhohadsimilarlyneverexperiencedrepetitivebraininjury.TheresearchteamuseddiffusiontensorimagingDTIwhichishighlyeffectiveatcatchingwhitematterchanges.Theresearchersfoundsurprisingchangesinthewhitematter.Eventhoughtheplayershadnoconcussionstheirbrainstoldadifferentstoryofdamageincludingchangestothemyelincoatingsurroundingnerves.'Althoughourstudyissmallitisthefirsttolookatsoccerplayerswithnosymptomsofconcussions'saysKoerte.'Wethinkitisanimportantfindingnotjustforsoccerplayersbutotherathletesofothersportstoo.''Ifplayersaredamagingtheirbrainsitisalargepublichealthissuebecauseeveryoneevenatayoungagehitstheirheadlikethis'saysDr.JeffreyBazariananassociateprofessorofemergencymedicineatauniversity.HewasnotinvolvedwiththestudybuthasalsousedDTItoassessmildbraininjuryinhighschoolfootballandhockeyplayers.Koertesaysmoreresearchisneededtogetabetterideaofhowpotentiallydamagingheadinjurycanbeatyoungages.IfitturnsoutrepetitiveheadblowsareharmingbrainfunctionsKoertesaysregulationslikestoppingplayingafterafixednumberofhitsmaybeneeded.Orheadingshouldn'tbeallowedatalluntilacertainage.ThestudyispublishedintheJournaloftheAmericanMeclicalAssociationJAMA.1Accordingtothestudysoccerplayersarelikelytobethreatenedby.A.sportsinjuriesB.routineheadersC.mildconcussionsD.fiercecompetition2Thestudyexplorestheconnectionbetween.A.concussionsandthewhitematterB.repetitiveheadblowsandbraininjuryC.thewhitematterandnervousnetworksD.nervesandtheirmyelinprotectivecoating3Howmanyplayerstookpartinthestudy?A.Eleven.B.Twelve.C.Twenty﹣three.D.Twenty﹣four4Dr.Bazarianseemstofeelthefindingsofthestudymaybe.A.importantB.interestingC.incorrectD.conflicting
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氧化白藜芦醇W具有抗病毒等作用.下面是利用Heck反应合成W的一种方法 回答下列问题 1A的化学名称为. 2中的官能团名称是. 3反应③的类型为W的分子式为. 4不同条件对反应④产率的影响如下表 上述实验探究了和对反应产率的影响.此外还可以进一步探究等对反应产率的影响. 5X为D的同分异构体写出满足如下条件的X的结构简式. ①含有苯环②有三种不同化学环境的氢个数比为621③1mol的X与足量金属Na反应可生成2gH2. 6利用Heck反应由苯和溴乙烷为原料制备写出合成路线.无机试剂任选
假定你是高三学子李华在离高考还有一个月之际你给校报英语天地投稿给本校高三学生写一封建议信对考前一个月的英语学习生活等提出自己的建议.内容包括: 1学习方法心态调整; 2生活作息规律; 3表达祝福 注意:1.词数100左右;2.可以适当增加细节以使行文连贯. Deareditor AsaseniorofhighschoolIfindmanyofmyfellowstudentsarestressedandworriedabouttheirEnglishwhilepreparingforthecomingCollegeEntranceExamination. ThereforeI'dliketogivethemsomeadvice. Yours LiHua
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下列化学方程式中不能正确表达反应颜色变化的是
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近年来我国科学家发现了一系列意义重大的铁系超导材料其中一类为Fe﹣Sm﹣As﹣F﹣O组成的化合物.回答下列问题 1元素As与N同族.预测As的氢化物分子的立体结构为其沸点比NH3的填“高”或“低”其判断理由是. 2Fe成为阳离子时首先失去轨道电子Sm的价层电子排布式4f66s2Sm3+价层电子排布式为. 3比较离子半径F﹣O2﹣填“大于”“等于”或“小于”. 4一种四方结构的超导化合物的晶胞如图1所示.晶胞中Sm和As原子的投影位置如图2所示. 图中F﹣和O2﹣共同占据晶胞的上下底面位置若两者的比例依次用x和1﹣x代表则该化合物的化学式表示为通过测定密度ρ和晶胞参数可以计算该物质的x值完成它们关系表达式ρ=g•cm﹣3. 以晶胞参数为单位长度建立的坐标系可以表示晶胞中各原子的位置称作原子分数坐标例如图1中原子1的坐标为则原子2和3的坐标分别为.
连二亚硫酸钠Na2S2O4•2H2O俗称保险粉易溶于水常用于印染纸张漂白等.回答下列问题 1Na2S2O4中S的化合价为. 2向锌粉的悬浮液中通入SO2制备ZnS2O4生成1molZnS2O4反应中转移的电子数为mol向ZnS2O4溶液中加入适量Na2CO3生成Na2S2O4并有沉淀产生该反应的化学方程式为 3Li﹣SO2电池具有高输出功率的优点.其正极为可吸附SO2的多孔碳电极负极为金属锂电解液为溶解有LiBr的碳酸丙烯酯﹣乙腈溶液.电池放电时正极上发生的电极反应为2SO2+2e﹣═S2O42﹣电池总反应式为.该电池不可用水替代混合有机溶剂其原因是.
Atouringdigitalexhibitionofaformeremperors'residenceistokickoffinlateApriltheBeijing﹣sPalaceMuseumalso1knowastheForbiddenCityandShenzhen﹣basedculturalcompanyArtronannouncedonFriday.Theexhibitionwillusevirtual2real.andartificialintelligenceamongmanyothertechnologiesto3wellintroducethefruitsofacademicresearchonYangxinDiantothepublic4digitallypresentingtheabundantcollectionofculturalrelicsandofferinteractiveexperiencestovisitors.Thehallbuiltinthemid﹣16thcenturyduringtheMingDynastywasalso5residenceoflasteightemperorsoftheQingDynasty.Anditisoneofthemostimportant6buildintheForbiddenCity7wasChinasimperialpalacefrom1420to1911.YangxinDian8shuttothepublicsinceDecember2015foramajorrenovation维修.HoweveritsculturalrelicshavebeenexhibitedincitieslikeShenzhenandHongKong.Therenovationistolastuntil2020.Meanwhile9offeramorelmmersiveexperiencetovisitorsthePalaceMuseumdevelopedthedigitalexhibitionin2017presentedinthemuseum'sdigitalgallery.In2018itwasshownattheArtronArtCenterinShenzhenattractingabout10000visitorsovertwomonths.TheupcomingexhibitiontourwillstartfrominL+MallinShanghai10thelaterdestinationsofthetourhaven'tbeenannounced.
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如图某工厂用NO气体制取NH4NO3溶液下列说法正确的是
今年是门捷列夫发现元素周期律150周年.下表是元素周期表的一部分WXYZ为短周期主族元素W与X的最高化合价之和为8.下列说法错误的是
环戊二烯是重要的有机化工原料广泛用于农药橡胶塑料等生产.回答下列问题 1已知g═g+H2g△H1=100.3kJ•mol﹣1① H2g+I2g═2HIg△H2=﹣11.0kJ•mol﹣1② 对于反应g+I2g═g+2HIg③△H3=kJ•mol﹣1. 2某温度下等物质的量的碘和环戊烯在刚性容器内发生反应③起始总压为105Pa平衡时总压增加了20%环戊烯的转化率为该反应的平衡常数Kp=Pa.达到平衡后欲增加环戊烯的平衡转化率可采取的措施有填标号. A.通入惰性气体B.提高温度C.增加环戊烯浓度D.增加碘浓度 3环戊二烯容易发生聚合生成二聚体该反应为可逆反应.不同温度下溶液中环戊二烯浓度与反应时间的关系如图所示下列说法正确的是填标号. A.T1>T2 B.a点的反应速率小于c点的反应速率 C.a点的正反应速率大于b点的逆反应速率 D.b点时二聚体的浓度为0.45mol•L﹣1 4环戊二烯可用于制备二茂铁FeC5H52结构简式为后者广泛应用于航天化工等领域中.二茂铁的电化学制备原理如图所示其中电解液为溶解有溴化钠电解质和环戊二烯的DMF溶液DMF为惰性有机溶剂. 该电解池的阳极为总反应为.电解制备需要在无水条件下进行原因为.
Bootcamp﹣stylefitnessclassesaretakingNewYorkCitybystormandevensoldierssaysomeoftheseexercisesareharderthanthebasictrainingtheyexperienced.Theseclassescondense压缩90daysoftrainingintoanhour﹣longclass.'It'smuchmorechallengeableinthatyoudon'thaveabreak'saysChadVincent37.Soifyouwantaworkoutthatwillhelpyoubeallyoucanbeherearesomegoodchoices:CircuitofChange57W.16thSt.212255﹣0053Thebase:Thisclass﹣foundedbyBrianDelmonicoin2011﹣helpsNewYorkersfindpeaceofmind.Marchingorders:Theone﹣hourfocusdoesn'tmeanyouwon'tsweat.Expectamixofgymnasticsandyogaindoorswhileoutdoorclassesincluderunningandjumpingoverbenchesandasmallwall.WarriorFitnessBootCamp29W.35thSt.212967﹣7977Thebase:Monkeybarsandhangingropesdecoratethisspacewhereacrewoffivenot﹣afraid﹣to﹣shoutinstructorsdohelp.Marchingorders:ThisworkoutmodeledafterrealbootcampsisasauthenticasitgetsaccordingtoformerMarineSgt.海军中士RubenBelliard.'Westaytruetothefactthatthisiswhatwewentthrough'hesays.Classesincludeaseriesof90﹣seconddrillsthatrequireteamworktocomplete.Stacy'sBootCamp646537﹣5466;stacysbootcamp.comThebase:StacyBermanturns17yearsofkickboxingexperienceintoaseriesofoutdoorbootcampsinCentralParkandBatteryPark.Marchingorders:ThreeweeklyclassesstartintheearlymorningaccordingtoLieslMarelli.Uncertaintyisabigpartoftherecipe.'Youdon'tknowwhatshe'sgoingtothrowatyouthatday'saysMarelli.BrickNewYork257W.17thSt.;bricknewyork.comThebase:ThispopularLosAngelesCrossFitgymopenedthismonthandinstructorWillLanierisalreadybeginningtotrainNewYorkerswithbootcamp﹣stylerunsandoutdoorworkouts.Marchingorders:ThelO﹣minutewarm﹣uprunwillfeeleasybeforeLanierstartshis'60﹣minuteworkout.'AlsodifferentformbootcampBrickwillsoonofferyogaclasses.1WhatisspecialaboutStacy'sBootCamp?A.Ithelpstofindinnerpeace.B.Thewarm﹣upactivityiseasy.C.Ithasaveryflexibleschedule.D.Theinstructorsareextremelystrict.2Whichofthefollowingclassesneedsmoreteamspirit?A.WarriorFitnessBootCamp.B.Stacy'sBootCamp.C.CircuitofChange.D.BrickNewYork.3Whatisthepurposeofthetext?A.Toencouragereaderstodomoreindoorexercises.B.Torecommendseveralbootcamp﹣stylefitnessclasses.C.Topersuadereaderstojoinbootcamp﹣stylefitnessclassesD.Tointroducetheadvantagesofbootcamp﹣stylefitnessclasses.
我国古代典籍中有“石胆……浅碧色烧之变白色者真”的记载其中石胆是指
用如图所示装置进行下列实验将①中溶液滴入②中预测的现象与实际相符的是
Thewaypeopleholdtothebeliefthatafun﹣filledpain﹣freelifeequalshappinessactuallyreducestheirchancesofeverattainingrealhappiness.Iffunandpleasureareequaltohappinessthenpainmustbeequaltounhappiness.Butinfacttheoppositeistrue:moreoftenthannotthingsthatleadtohappinessinvolvesomepain.Asaresultmanypeopleavoidtheveryattemptsthatarethesourceoftruehappiness.Theyfearthepaininevitablybroughtbysuchthingsasmarriageraisingchildrenprofessionalachievementreligiouscommitmentselfimprovement.Askabachelorwhyheresistsmarriageeventhoughhefindsdatingtobelessandlesssatisfying.Ifheishonesthewilltellyouthatheisafraidofmakingacommitment.Forcommitmentisinfactquitepainful.Thesinglelifeisfilledwithfunadventureexcitement.Marriagehassuchmomentsbuttheyarenotitsmostdistinguishingfeatures.Coupleswithinfantchildrenareluckytogetawholenight'ssleeporthree﹣dayvacation.Idon'tknowanyparentwhowouldchoosethewordfuntodescriberaisingchildren.Butcoupleswhodecidenottohavechildrenneverknowthejoysofwatchingachildgrowuporofplayingwithagrandchild.Understandingandacceptingthattruehappinesshasnothingtodowithfunisoneofthemostliberatingrealizations.Itliberatestime:nowwecandevotemorehourstoactivitiesthatcangenuinelyincreaseourhappiness.Itliberatesmoney:buyingthatnewcarorthosefancyclothesthatwilldonothingtoincreaseourhappinessnowseemspointless.Anditliberatesusfromenvy:wenowunderstandthatallthosewhoarealwayshavingsomuchfunactuallymaynotbehappyatall.1Accordingtotheauthorabachelorresistsmarriagechieflybecause.A.heisreluctanttotakeonfamilyresponsibilitiesB.hebelievesthatlifewillbemorecheerfulifheremainssingleC.hefindsmorefunindatingthaninmarriageD.hefearsitwillputanendtoallhisfunadventureandexcitement2Raisingchildrenintheauthor'sopinionis.A.amoraldutyB.arewardingtaskC.athanklessjobD.asourceofinevitablepain3Fromthelastparagraphwelearnthatenvysometimesstemsfrom.A.HatredB.misunderstandingC.PrejudiceD.ignorance4Whatistheauthortryingtotellus?A.Happinessoftengoeshandinhandwithpain.B.Onemustknowhowtoattainhappiness.C.Itisimportanttomakecommitments.D.Itispainthatleadstohappiness.
“春蚕到死丝方尽蜡炬成灰泪始干”是唐代诗人李商隐的著名诗句.下列关于该诗句中所涉及物质的说法错误的是
分子式为C4H8BrCl的有机物共有不含立体异构
微型银﹣锌电池可用作电子仪器的电源其电极分别是Ag/Ag2O和Zn电解质为KOH溶液电池总反应为Ag2O+Zn+H2O═2Ag+ZnOH2下列说法正确的是
下列说法正确的是
由γ﹣羟基丁酸生成γ﹣丁内酯的反应如下 在298K下γ﹣羟基丁酸水溶液的初始浓度为0.180mol•L﹣1测得γ﹣丁内酯的浓度随时间变化的数据如表所示.回答下列问题 1该反应在50~80min内的平均反应速率为mol•L﹣1•min﹣1. 2120min时γ﹣羟基丁酸的转化率为. 3298K时该反应的平衡常数K=. 4为提高γ﹣羟基丁酸的平衡转化率除适当控制反应温度外还可采取的措施是
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