电力系统中，对称分量法主要用来分析(    )运行方式。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id < 4421564 and id<>'4421564' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id > 4421564 and id<>'4421564' order by id asc limit 5