当电流超过某一预定数值时，反应电流升高而动作的保护装置叫做()。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69548' and id < 4506954 and id<>'4506954' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69548' and id > 4506954 and id<>'4506954' order by id asc limit 5