阀式避雷器的保护比是指残压与（）电压之比。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='32606' and id < 2592700 and id<>'2592700' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32606' and id > 2592700 and id<>'2592700' order by id asc limit 5