某工程双代号时标网络计划如下图所示，其中工作B的总时差和自由时差()周

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24809' and id < 2121285 and id<>'2121285' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24809' and id > 2121285 and id<>'2121285' order by id asc limit 5