由功功率和阻抗表示的电压降落纵分量的表达式为(  )。（2.0）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69416' and id < 4494654 and id<>'4494654' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69416' and id > 4494654 and id<>'4494654' order by id asc limit 5