某工程双代号网络计划如下图所示，其关键线路有（）条。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24806' and id < 2121139 and id<>'2121139' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24806' and id > 2121139 and id<>'2121139' order by id asc limit 5