当电力系统发生故障时，利用对称分量可以将电流分为（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69376' and id < 4491286 and id<>'4491286' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69376' and id > 4491286 and id<>'4491286' order by id asc limit 5