智能变电站中，变电站监控系统的结构划分为（ ）层。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29474' and id < 2398452 and id<>'2398452' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29474' and id > 2398452 and id<>'2398452' order by id asc limit 5