等电位连接主母线的最小截面应不小于（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='55203' and id < 3486407 and id<>'3486407' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='55203' and id > 3486407 and id<>'3486407' order by id asc limit 5