电网包括（    ）环节，用于联系发电厂和电力用户。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69405' and id < 4493610 and id<>'4493610' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69405' and id > 4493610 and id<>'4493610' order by id asc limit 5