漏电保护断路器的工作原理是（）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='27223' and id < 2260114 and id<>'2260114' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27223' and id > 2260114 and id<>'2260114' order by id asc limit 5