耦合电容器在高频保护中的作用是（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69394' and id < 4492165 and id<>'4492165' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69394' and id > 4492165 and id<>'4492165' order by id asc limit 5