根据在电力系统中的作用，电力网又分为输电网和（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69517' and id < 4503634 and id<>'4503634' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69517' and id > 4503634 and id<>'4503634' order by id asc limit 5