内部过电压的倍数是内部过电压的(    )与电网工频相电压有效值的比值。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69523' and id < 4504167 and id<>'4504167' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69523' and id > 4504167 and id<>'4504167' order by id asc limit 5