系统发生不对称故障时，各序电压的分布规律为()。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69548' and id < 4507080 and id<>'4507080' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69548' and id > 4507080 and id<>'4507080' order by id asc limit 5