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制作将某些元素悬浮在网页上的效果时，需要用到CSS样式中的（）为元素指定一个位置。
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常见的扣球技术主要有（）种。
Inthe1960s,medicalresearchersThomasHolmesandRichardRahedevelopedachecklistofstressfulevents.Theyappreciatedthetrickypointthatanymajorchangecanbestressful.Badeventslike“seriousillnessofafamilymember”werehighonthelist,butsoweresomehelpfullifechangingeventslikemarriage.WhenyoutaketheHolmesRaheyoumustrememberthatthescoredoesnotshowhowyoudealwithstress—itonlyshowshowmuchyouhavetodealwith.Andwenowknowthatthewayyoudealwiththeseeventsdramaticallyaffectsyourchancesofstayinghealthy.Bytheearly1970s,hundredsofsimilarstudieshadfollowedHolmesandRahe.AndmillionsofAmericanswhoworkandliveunderstressworriedoverthereports.Somehowtheresearchgotboileddowntoamemorablemessage.Women’smagazinesranheadlineslike“Stresscausesillness.”Ifyouwanttostayphysicallyandmentallyhealthy,thearticlessaid,avoidstressfulevents.Butsuchsimplisticadviceisimpossibletofollow.Evenifstressfuleventsaredangerous,many－likethedeathoflovedone－areimpossibletoavoid．Moreover,anywarningtoavoidallstressfuleventsisaprescriptionforstayingawayfromchancesaswellastrouble.Sinceanychangecanbestressful,apersonwhowantedtobecompletelyfreeofstresswouldnevermarry,haveachild,takeanewjobormove.Theideathatallstressmakesyousickalsotakesnonoticeofalotofwhatweknowaboutpeople.Itsupposeswe'reallvulnerable(脆弱的)andnotactiveinthefaceofthedifficultsituation.Butwhatabouthumanabilityandcreativity?Manycomethroughperiodsofstresswithmorephysicalandmentalstrengththantheyhadbefore.Wealsoknowthatalongtimewithoutchangeorchallengecanleadtoboredomandphysicalandmentalstrain.Thestudiesonstressintheearly1970sledto（）。
市民微信在线进行业务咨询，可使用（）。
在构件跟踪模块，批量导出二维码功能在哪里能找到？（）
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