电力系统采用有名制计算时，电压、电流、功率的关系表达式为(  )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69510' and id < 4503160 and id<>'4503160' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69510' and id > 4503160 and id<>'4503160' order by id asc limit 5