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如图所示,在水平桌面上有甲、乙、丙三个完全相同的容器,装有不同的液体,现将三个完全相同的圆柱体分别放入容器的液体中,静止时三个容器的液面恰好相平.在三个容器中,液体密度最小的是 ,三种液体对容器...
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水平桌面上放有甲乙丙三个完全相同的圆柱形容器容器中装有适量水在容器中分别放入体积相同的ABC三个小球
三个质量相同底面积相同但形状不同的容器放在水平桌面上其内分别装有甲乙丙三种液体它们的液面在同一水平面
甲最大
乙最大
丙最大
一样大
如图所示在水平桌面上有甲乙丙三个完全相同的容器装有不同的液体现将三个完全相同的圆柱体分别放入容器的
水平桌面上放有甲乙丙三个完全相同的圆柱形容器容器中装有适量水在容器中分别放入体积相同的
B.C.三个小球,三球静止时,A.漂浮、
悬浮、
沉底,此时三容器中水面恰好相平,如图所示.则下列说法正确的是( )
A.三个小球的密度关系是ρ
A.
>ρ
B.
>ρ
C.
B.三个小球的重力关系是G.
A.
=G
B.
<G.
C.
C.三个小球所受浮力关系是F.
A.
<F.
B.
=F
C.
三个容器对桌面压力关系的F.
甲
=F
乙
<F.
丙
水平桌面上放有甲乙丙三个完全相同的圆柱形容器容器中装有适量水在容器中分别放入体积相同的
B.C.三个小球,三球静止时,A.漂浮、
悬浮、
沉底,此时三容器中水面恰好相平,如图所示.则下列说法正确的是( )
A.三个小球的密度关系是ρ
A.
>ρ
B.
>ρ
C.
B.三个小球的重力关系是G.
A.
=G
B.
<G.
C.
C.三个小球所受浮力关系是F.
A.
<F.
B.
=F
C.
三个容器对桌面压力关系的F.
甲
=F
乙
<F.
丙
如图所示在水平桌面上有甲乙丙三个完全相同的容器装有不同的液体现将三个完全相同的圆柱体分别放入容器的
水平桌面上有甲乙丙三个完全相同的容器装有不同的液体将三个长方体
B.C.分别放入容器的液体中,静止时的位置如图所示,三个容器的液面相平。已知三个长方体的质量和体积都相同。则下列判断正确的是 A.物体受到的浮力 F.
浮A.
>F.
浮
>F.
浮
B.容器对桌面的压力 F.
甲
<F.
乙
<F.
丙
C.液体对容器底的压强 p
甲
=p
乙
=p
丙
物体下表面受到液体的压力 F.′
A
>F.′
B
=F.′
C
如图所示在水平桌面上有甲乙丙三个完全相同的容器装有不同的液体现将三个完全相同的圆柱体分别放入容器的
如图所示三个完全相同的容器内装有适量的水后在乙容器内放入木块漂浮在水面上丙容器内放一个小球悬浮在水中
三个容器中,水对容器底的压强相等
三个容器中,水对容器底的压力不相等
如果向乙容器中加入盐水,木块受到的浮力变大
如果向丙容器中加入酒精,小球将上浮
如图所示在水平桌面上有甲乙丙三个完全相同的容器装有不同的液体现将三个完全相同的圆柱体分别放入容器的液
甲乙是两个完全相同的装满酒精的容器如图3所示放置在水平桌面上则容器甲底部受到的压强_______容器
如图5所示水平桌面上放着甲乙丙三个底面积相同的容器若在三个容器中装入质量相等的水三个容器底部所受水的
甲最大
乙最大
丙最大
一样大
三个质量相同底面积相同但形状不同的容器放在水平桌面上其内分别装有甲乙丙三种液体它们的液面在同一水平面
甲最大
乙最大
丙最大
一样大
如图所示在水平桌面上有甲乙丙三个完全相同的容器装有不同的液体现将三个完全相同的圆柱体分别放入容器的
如图所示在水平桌面上有甲乙丙三个完全相同的容器装有不同的液体现将三个完全相同的圆柱体分别放入容器的
三个质量相同底面积相同但形状不同的容器放在水平桌面上其内分别装有甲乙丙三种液体它们的液面在同一水平面
)一样大 (
)甲最大 (
)乙最大 (
)丙最大
如图所示在水平桌面上有甲乙丙三个完全相同的容器装有不同的液体现将三个完全相同的圆柱体分别放入容器的
如图所示放在水平桌面上的甲乙丙三个完全相同的容器装有不同的液体将三个完全相同的长方体ABC分别放入
如图所示在水平桌面上有甲乙丙三个完全相同的容器装有不同的液体现将三个完全相同的圆柱体分别放入容器的
如图7所示在水平桌面上有甲乙丙三个完全相同的容器装有不同的液体现将三个完全相同的圆柱体分别放入容器的
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8分2015WasaWarmWildYear.What'sNext?2015sawthingsheatupandgetoutofhandandnotjustinpolitics.ArecordwarmDecemberraisedaveragetemperaturesenoughtomake2015thesecondhottestyearonrecordinthecontiguousUnitedStatesaccordingtotheNationalOceanicandAtmosphericAdministration'sNationalClimateMonitoringAnnualReportwhichwasreleasedThursday.TheUnitedNationshadpreviouslyreportedthat2015wasshapinguptobethewarmestyearonrecordforthewholeplanet.LastyearwasalsothethirdwettestonrecordintheU.S.andsawtenweather﹣orclimate﹣relateddisastersthateachcausedatleast﹩1billionindamageintheU.S.andkilledatotalof155people.Theseincludeadroughttwofloodsfiveseverestormsawildfireandawinterstorm.TheaverageU.S.temperaturewas54.4°F2.4°Fabovethe20thcenturyaverageandsecondonlyto2012'srecordwarmth.Thiswasalsothe19thconsecutiveyearwithaveragetemperaturesabovetheaverageforthecentury.Everystatereportedabove﹣averageannualtemperatures.ThewarmingwasparticularlypronouncedacrossmostoftheeasternhalfofthecountryinDecemberwhenmanyplacessawtemperatures30degreesabovenormalandmanyrecordswereset.ThismirroredchangesseenintheArcticthatmonthwhentemperaturesspikedto50degreesabovenormal.PartofthiswarmingwasdrivenbyastrongElNiñoorperiodicwarminginthePacificOceanbutsomeofitcanalsobeattributedtoglobalwarmingsaysmeteorologistEricHolthauswhowasnotinvolvedwiththefederalreport.TheanalysiscomeslessthanamonthaftertheU.S.and194othercountriessignedanagreementinParistomoreaggressivelycountertheeffectsofclimatechange.'EvenifalltheinitialtargetsinParisaremetwe'llonlybepartofthewaytherewhenitcomestoreducingcarbonfromtheatmosphere'saidPresidentBarackObamaatthetime.Stilltheagreementrepresented'aturningpoint'bysettingup'thearchitecture'fordoingsohesaid.NOAA'sclimatemonitoringcenterdoesn'tissuepredictionsforfutureweatherbuttheagency'sClimatePredictionCenterdoes.Thatteam'sforecastforthenextthreemonthscallsforwarmer﹣than﹣averagetemperaturesinmuchofthecountryalthoughpartsofTexasandtheSoutheastmaybealittlecoolerthanusual.AsLancasterUniversityProfessorGailWhitemantoldtheWeatherChannel'climatechangemeansextremeweatheristhenewnormal.'1AccordingtothepassagethewarmestyearintheU.S.isA.2014B.2015C.notmentionedD.20122Accordingtothepassagewhichstatementisright?A.2015wasthethirdwettestyearonrecordinthewholeplanet.B.Tenweather﹣orclimate﹣relateddisastersintheU.S.includeadroughttwofloodsfourseverestormstwowildfiresandawinterstorm.C.The20thcenturyaveragetemperatureintheU.S.was52°F.D.ThewarmingwaspronouncedacrossmostofthewesternhalfofthecountryinDecember.3TheagreementtheUS.and194countriessignedaimedtoA.reducecarbonfromtheatmosphereB.countereffectsofclimatechange.C.setupthearchitectureD.findartificialwaystocooldowntheextremeweather4WhatdoesProfessorGailWhitemanmeaninthefuture?A.Extremeweatherwillbecommoninthefuture.B.Climatechangewillbenormal.C.Extremeweatherwillbenormalifwedon'ttakemeasures.D.Climatechangeleadtoextremeweather.
Ifyoufeelstressedbyresponsibilitiesatworkyoushouldtakeastepbackandidentify识别thoseof61greatandlessimportance.Thenhandlethemostimportanttasksfirstsoyou'llfeelarealsenseof62achieve.Leavingthelessimportantthingsuntiltomorrow63beoftenacceptable.Mostofusaremorefocused64ourtasksinthemorningthanwearelaterintheday.Sogetanearlystartandtrytobeasproductive65possiblebeforelunch.Thiswillgiveyoutheconfidenceyouneedtogetyouthroughtheafternoonandgohomefeelingaccomplished.Recent66studyshowthatwearefarmoreproductiveatworkifwetakeshortbreaks67regular.Giveyourbodyandbrainarestbysteppingoutsidefor68whileexercisingordoingsomethingyouenjoy.Ifyoufindsomethingyoulovedoingoutsideoftheofficeyou'llbelesslikely69bringyourworkhome.Itcouldbeanything﹣gardeningcookingmusicsports﹣butwhateveritis70makesureit'sarelieffromdailystressratherthananotherthingtoworryabout.
下列4个图象能正确反映对应变化关系的是
2016年10月17日“神舟十一号”载人飞船在酒泉卫星发射中心成功发射下列航天员景海鹏和陈冬在太空享用第一顿美餐中的食物富含糖类的是
Readingcanbeasocialactivity.Thinkofthepeoplewhobelongtobookgroups.Theychoosebookstoreadandthenmeettodiscussthem.NowthewebsiteBookCrossing.comBookCrossing.comturnsthepageonthetraditionalideaofabookgroup.Membersgoonthesiteandregisterthebookstheyownandwouldliketoshare.BookCrossingprovidesanidentificationnumbertostickinsidethebook.Thenthepersonleavesitinapublicplacehopingthatthebookwillhaveanadventuretravelingfarandwidewitheachnewreaderwhofindsit.BrucePedersonthemanagingdirectorofBookCrossingsays'Thetwothingsthatchangeyourlifearethepeopleyoumeetandbooksyouread.BookCrossingcombinesboth.'Membersleavebooksonparkbenchesandbusesintrainstationsandcoffeeshops.Whoeverfindstheirbookwillgotothesiteandrecordwheretheyfoundit.Peoplewhofindabookcanalsoleaveajournalentrydescribingwhattheythoughtofit.E﹣mailsarethensenttotheBookCrossingtokeepthemupdatedaboutwheretheirbookshavebeenfound.Brucepetersonsaystheideaisforpeoplenottobeselfishbykeepingabooktogatherdustonashelfathome.BookCrossingispartofatrendamongpeoplewhowanttogetbacktothe'real'andnotthevirtual虚拟.Thesitenowhasmorethanonemillionmembersinmorethanonehundredthirty﹣fivecountries.29.Whydoestheauthormentionbookgroupsinthefirstparagraph?A.Toexplainwhattheyare.B.TointroduceBookCrossing.C.Tostresstheimportanceofreading.D.Toencouragereaderstosharetheirideas.30.Whatdoestheunderlinedword'it'inParagraph2referto?A.Thebook.B.Anadventure.C.Apublicplace.D.Theidentificationnumber.31.WhatwillaBookCrosserdowithabookafterreadingit?A.Meetotherreaderstodiscussit.B.Keepitsafeinhisbookcase.C.Passitontoanotherreader.D.Mailitbacktoitsowner.32.Whatisthebesttitleforthetext?A.OnlineReadingAVirtualTourB.ElectronicBooksAnewTrendC.ABookGroupBringsTraditionBackD.AWebsiteLinksPeoplethroughBooks.
What'sOn?ElectricUnderground7.30pm﹣1.00amFreeattheCyclopsTheatreDoyouknowwho'splayinginyourarea?We'rebringingyouaneveningofliverockandpopmusicfromthebestlocalbands.Areyouinterestedinbecomingamusicianandgettingarecordingcontract合同?Ifsocomeearlytothetalkat7.30pmbyJulesSkyeasuccessfulrecordproducer.He'sgoingtotalkabouthowyoucanfindtherightpersontoproduceyoumusic.GeeWhizz8.30pm﹣10.30pmComedyatKaleidoscopeComeandseeGeeWhizzperform.He'sthefunnieststand﹣upcomedianonthecomedyscene.Thisjoyfulshowwillpleaseeveryonefromtheyoungesttotheoldest.GeeWhizzreallyknowshowtomakeyoulaugh!Ourbarisopenfrom7.00pmfordrinksandsnacks快餐.Simon'sWorkshop5.00pm﹣7.30pmWednesdaysatVictoriaStageThisisagoodchanceforanyonewhowantstolearnhowtodocomedy.Theworkshoplooksateverykindofcomedyandpracticesmanydifferentwaysofmakingpeoplelaugh.Simonisacomedianandactorwhohas10years'experienceofteachingcomedy.Hisworkshopsareexcitingandfun.AneveningwithSimonwillgiveyoutheconfidencetobefunny.CharlotteStone8.00pm﹣11.00pmPizzaWorldFinefoodwithbeautifuljazzmusicthisisagreateveningout.CharlotteStonewillperformsongsfromhernewbest﹣sellingCDwithJamesPickeringonthepiano.ThemenuisItalianwithexcellentmeatandfreshfishpizzasandpasta面食.Bookearlytogetatable.Ourbarisopenalldayandservescocktailscoffeebeerandwhitewine.21.Whocanhelpyouifyouwanttohaveyourmusicproduced?A.JulesSkye.B.GeeWhizz.C.CharlotteStone.D.JamesPickering.22.Atwhichplacecanpeopleofdifferentagesenjoyagoodlaugh?A.TheCyclopsTheatreB.KaleidoscopeC.VictoriaStageD.PizzaWorld23.WhatdoweknowaboutSimon'sWorkshop?A.Itrequiresmembershipstatus.B.Itlaststhreehourseachtime.C.Itisrunbyacomedyclub.D.ItisheldeveryWednesday.24.WhenwillCharlotteStoneperformhersongs?A.5.00pm﹣7.30pm.B.7.30pm﹣1.00am.C.8.00pm﹣11.00pm.D.8.30pm﹣10.30pm.
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2017年4月26日我国第二艘航空母舰下水仪式在中国船舶重工集团公司大连造船厂举行.制造航母所用特种钢中有一种锰钢其主要性能是韧性好硬度大.若金属锰Mn在金属活动性顺序中位于铝和锌之间则下列反应不正确的是
过氧化钠Na2O2是一种供氧剂与水反应的化学方程式为2Na2O2+2H2O═4NaOH+O2↑.将10g含过氧化钠78%的过氧化钠样品只含有NaOH杂质加入到85.2g质量分数为10%的氢氧化钠溶液中充分反应水的挥发忽略不计.请计算 1生成氧气的质量. 2反应后所得溶液中溶质的质量分数. 3若将反应后的溶液的溶质质量分数恢复到10%需加入水的质量.
Agardenthat'sjustrightforyouHaveyouevervisitedagardenthatseemedjustrightforyouwheretheatmosphereofthegardenappearedtototalmorethanthesum总和ofitsparts?36.Butitdoesn'thappenbyaccident.Itstartswithlookinginsideyourselfandunderstandingwhoyouarewithrespecttothenaturalworldandhowyouapproachthegardeningprocess.●37Somepeoplemaythinkthatagardenisnomorethanplantsflowerspatternsandmassesofcolor.Othersareconcernedaboutusinggardeningmethodsthatrequirelesswaterandfewerfertilizers肥料.38.Howeverthereareanumberofotherreasonsthatmightexplainwhyyouwanttogarden.Oneofthemcomesfromourearliestyears.●Recall回忆yourchildhoodmemoriesOurmodelofwhatagardenshouldbeoftengoesbacktochildhood.Grandma'srosegardenandDad'svegetablegardenmightbegoodorbadbutthat'snotwhat'simportant.39﹣﹣howbeinginthosegardensmadeusfeel.Ifyou'dliketobuildapowerfulbondwithyourgardenstartbytakingsometimetorecallthegardensofyouryouth.40thengooutsideandworkoutaplantotranslateyourchildhoodmemoriesintoyourgrown﹣upgarden.Havefun.A.KnowwhyyougardenB.FindagoodplaceforyourowngardenC.It'sourexperienceofthegardenthatmattersD.It'sdelightfultoseesomanybeautifulflowersE.StillothersmaysimplyenjoybeingoutdoorsandclosetoplantsF.YoucanproducethatkindofmagicalqualityinyourowngardentooG.Foreachofthosegardenswriterdownthestrongestmemoryyouhave.
下图四支蜡烛都将熄灭其中一支熄灭的原因与另外三支不同的是
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气体的制备是化学实验基本技能之一.如图为实验室常见的气体制取收集等装置回答下列问题 1图中标号①仪器的名称是. 2小睿选图A用氯酸钾和二氧化锰制取O2反应的化学方程式是. 3实验室常用块状硫化亚铁固体和稀硫酸在常温下反应制取硫化氢硫化氢H2S是一种有毒气体密度比空气大能溶于水形成氢硫酸实验室中常用NaOH溶液来吸收有毒的硫化氢气体若要制取并收集一瓶干燥的硫化氢气体则图D中的试剂是填名称选择的装置中导管口的连接顺序是图E中反应的化学方程式是.
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如图为空气成分比例图按体积计算其中b代表的气体是
10分Therelationshipbetweenexerciseandcancerhaslongbothintriguedandpuzzledoncologistsandexercisephysiologists.Exerciseisstronglyassociatedwithloweredrisksformanytypesofcancer.Atthesametimeexerciseinvolvesbiologicalstresswhichtypicallyleadstoashort﹣termincreaseininflammation发炎whichcancontributetohigherrisksformanycancers.Nowanewstudyinmicemayoffersomecluesintotheexercise﹣cancerparadox.Itsuggeststhatexercisemaychangehowtheimmunesystemdealswithcancerbyboostingadrenaline肾上腺素certainimmunecellsandotherchemicalsthattogethercanreducetheseverityofcancerorfightitoffaltogether.TotrytobetterunderstandhowexercisecanbothelevateinflammationandsimultaneouslyprotectthebodyagainstcancerscientistsattheUniversityofCopenhageninDenmarkandotherinstitutionsdecidedtocloselyexaminewhathappensinsidemiceathighriskforthedisease.Soforthenewstudytheybeganbygatheringagroupofadultlabmice.Theseanimalsgenerallyliketorun.Thescientiststhenimplantedmelanoma黑素瘤skincancercellsintothemicebeforeprovidinghalfofthemwithrunningwheelsintheircageswhiletheotheranimalsremainedsedentary.Afterfourweeksfarfeweroftherunnershaddevelopedfull﹣blownmelanomathanthesedentarymiceandthosethathadbeendiagnosedwiththediseaseshowedfewerandsmallerlesions.Theydrewbloodfromboththeexercisingandsedentaryanimalsandcellsfromanytumorsinbothgroups.Asexpectedtheyfoundmuchhigherlevelsofthehormoneadrenalineinthebloodoftheexercisinganimalsespeciallyrightaftertheyhadbeenworkingoutonthewheelsbutalsoatothertimesoftheday.Thebodyreleasesadrenalineinresponsetoalmostanytypeofstressfulexperienceincludingexercise.Theyalsofoundhigherlevelsofinterleukin﹣6inthebloodoftherunners.Thisisasubstancethatisreleasedbyworkingmusclesandisbelievedtobothincreaseanddecreaseinflammationinthebodydependingonwhereandhowitgoestowork.Perhapsmostimportanttheyfoundmuchhighernumbersinthebloodstreamsofrunnersthaninthesedentarymiceofatypeofimmunecellnamednaturalkillercellsthatareknowntobestrongcancerfighters.Sothescientistsrepeatedtheiroriginalexperimentmultipletimesinducingcancerwhileallowingsomemicetorunandotherstosit.Insomeofthesefollow﹣upexperimentsthescientistsinjectedtherunnerswithasubstancethatblockedtheproductionofadrenalineandgavesedentaryanimalslargedosesofaddedadrenaline.Whattheynowfoundwasthatwhenrunningmicecouldnotproduceadrenalinetheydevelopedcanceratthesamerateasthesedentaryanimalswhilethesedentaryanimalsthathadbeeninjectedwithextraadrenalinefoughtofftheirtumorsbetterthanothersittingmice.Moreremarkablythescientistsdeterminedthatadrenalineseemedtobesendingbiochemicalsignalstosomeoftheanimals'IL﹣6cellsmakingthemphysiologicallymorealertsothatwhenatumorbegantodevelopintheaffectedanimalthoseIL﹣6cellsinturnactivatedthenaturalkillercellsinthebloodstreamandactuallydirectedthemtothetumorslikeminuteguidefish.Withtheseresults'weshowthatvoluntarywheelrunninginmicecanreducethegrowthoftumorsandwehaveidentifiedanexercise﹣dependentmobilizationofnaturalkillercellsastheunderlyingcauseofthisprotection'saidPernilleHojmanaresearcherattheUniversityofCopenhagenwhooversawthenewstudy.Itperhapsprovidesonemoreincentiveforustogetupandmove.1TherelationshipbetweenexerciseandcancerhaslongpuzzledoncologistsandexercisephysiologistsbecauseA.exerciseisstronglyassociatedwithloweredrisksformanytypesofcancer.B.exercisecanbothelevateinflammationwhichcancontributetohigherrisksformanycancersandmeanwhileprotectthebodyagainstcancer.C.exercisemaychangecanreducetheseverityofcancerorfightitoffaltogether.D.exercisecanleadtoashort﹣termincreaseininflammationwhichcancontributetoelevatedrisksformanycancers.2Inthefirstexperimentwhichoneisthemostimportantresultthescientistsfound?A.naturalkillercellsaremuchmoreinthebloodstreamsofrunnersthaninthesedentarymice.B.levelsofinterleukin﹣6arehigherinthebloodoftherunnersthaninthesedentarymice.C.exercisesuchasrunningseemedtohelpthemicefightagainstthecancer.D.adrenalinecanreducetheseverityofcancerorfightitoff.3Whatdoestheunderlinedword'sedentary'mean?A.runB.moveC.sitD.sleep4Inthefollow﹣upexperimentsthescientistsfound?A.thehormoneadrenalinehasmuchhigherlevelsinthebloodoftheexercisinganimals.B.howtheseelementsintherunners﹣theirincreasedadrenalineIL﹣6andnaturalkillerimmunecellsfightagainsttumor.C.interleukin﹣6canbothincreaseanddecreaseinflammationinthebodydependingonwhereandhowitgoestowork.D.whathappensinsidemiceathighriskforthedisease.5Accordingtothestudywecaninferthefundamentalsubstancetofightthecanceroffis.A.adrenalineB.interleukin﹣6C.naturalkillercellsD.genes
10分It'snosecretthatdoinggoodmakesothershappy﹣butdidyouknowitcanmakeyouhappyaswell?Accordingtoastudypeopleparticipatinginmeaningfulactivitieswerehappierandfeltthattheirliveshadmorepurposethanpeoplewhoonlyengagedinpleasure﹣seekingbehaviors.Trygivingthesefourthingstootherstostartyourjourneytoahappierandhealthierlifestyle.1.YourTimeWithabusylifeitcanbehardtofindanytimetogiveaway.Howevervolunteeringyourtimehasgreatbenefitsincludingmakingnewfriendsandconnectionslearningnewskillsandevenadvancingyourcareer.Accordingtoapaperaboutthelinkbetweenhealthandvolunteeringvolunteeringisconnectedwithlowerinstancesofdepressionandreducestheriskofdyingby22percent.2.YourAttentionMostofusthinkwe'regoodlistenersbutaccordingtopsychologistPaulDonoghuemostpeopleareawarethatothersdon'tlistenaswellastheycould.Inadditionthey'renotfullyawarethattheythemselvesaren'tlistening.Whenpracticingmindfulnessmeditation正念禅修youfocusonwhatyouexperienceinthemomentandletyourthoughtsandemotionspassthroughwithoutjudgment.Didyouknowthatgivingsomeoneyourundividedattentionhelpsyoualso?Whendonewellactivelisteningstrengthensyourfocus﹣whichisamajorpartofgoodmeditation.3.YourCompassionThepsychologicalmeaningofcompassionistheabilitytounderstandanotherperson'semotionalstate.Compassiondiffersfromempathy移情inthatthosewhoexperiencecompassionnotonlyputthemselvesinanotherperson'sshoesbutalsowanttoreducethatperson'ssuffering.Abrain﹣imagingstudyshowedthatthebrain'spleasurecentersareequallyactivewhenwegivemoneytothepooraswhenwereceivemoneyourselves.4.YourMoneyAccordingtoanexperimentthosewhospendmoneyonotherpeoplearesignificantlyhappierthanthosewhospendthesamequantityofmoneyonthemselves.Whetherornotyoucanofferothergiftsdonatingmoneyhelpsmakerealchangehappen.Itrepresentstimespentcompassionandcarefulattentiontotheneedsofothers.
如图为空气成分比例图按体积计算其中b代表的气体是
It'sapitythatwecan'tarrangeforouragendaotherwisewe______farmorefreedomduringthewholejourney. A.enjoyed B.hadenjoyed C.wouldhaveenjoyed D.wouldenjoy
随着我国航天科技水平的迅速提高已经成功发射过很多火箭. 1“嫦娥三号”探测器于2013年12月2日在西昌卫星发射中心成功发射承担发射任务的长三乙火箭第三子级使用的推进剂是液氢和液氧液氢在液氧中燃烧的化学方程式是. 2“天宫二号”于2016年9月15日在酒泉卫星发射中心成功发射承担发射任务的长征二号FT2运载火箭使用偏二甲肼和四氧化二氮N2O4的推进剂组合其完全反应的化学方程式为 X+2N2O43N2↑+2CO2↑+4H2O则偏二甲肼X的化学式是. 3中国自主研制的首艘货运飞船“天舟一号”于2017年4月20日在海南文昌卫星发射中心成功发射执行发射任务的长征七号运载火箭采用液氧加煤油的低温推进剂组合由于液氧的温度可以达到﹣183℃因此长征七号运载火箭也被誉为“冰箭”.下列说法正确的是填序号. A.液氧是单质 B.液氧是淡蓝色的溶液 C.液氧能促使燃料迅速燃烧 D.煤油是从煤中分离出来的.
2016年10月17日“神舟十一号”载人飞船在酒泉卫星发射中心成功发射下列航天员景海鹏和陈冬在太空享用第一顿美餐中的食物富含糖类的是
周杰伦在菊花台中唱道“梦在远方化成一缕香随风飘散你的模样”…人在远处能闻到一缕香味是因为
﹣﹣﹣CanIreallygetanapple6plusasarewardifIwinthecompetition? ﹣﹣﹣Absolutely!________. A.Sowillyou B.Italldepends C.Imeanit D.That'sallright
周杰伦在菊花台中唱道“梦在远方化成一缕香随风飘散你的模样”…人在远处能闻到一缕香味是因为
Mostofemployersareplanningtocutdownonwagesinsteadoflayingoffemployees______theeconomicdepression. A.indefenseof B.withregardto C.onbehalfof D.inresponseto
在当下热播的电视剧人民的名义中达康书记在省委召开的环境综合治理扩大会议上指出工厂废液应变废为宝并处理达标后才能排放.某工厂废液中含有氯化钠氯化铜和氯化亚铁某课外小组要从废液中回收铜并得到铁红主要成分是Fe2O3要求全过程不引入其它金属元素设计实验方案如图所示回答下列问题 1在步骤①中操作a的名称是. 2步骤①②③中所发生的化学反应其中属于复分解反应的是填序号. 3步骤④中如果发生的是一个分解反应且生成物为两种氧化物则另外一种生成物应该是. 4铁红是炼铁的主要原料工业上用CO和铁红炼铁的化学方程式是.
下列生产和生活中没有用熟石灰的是
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