电力系统的复杂故障是指（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68463' and id < 4420096 and id<>'4420096' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68463' and id > 4420096 and id<>'4420096' order by id asc limit 5