对称三相电路采用归结为一相的计算方法时，最后应化简为（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id < 4499996 and id<>'4499996' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id > 4499996 and id<>'4499996' order by id asc limit 5