当施加于电容元件上的电压不随时间变化时，电容元件相当于（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69494' and id < 4501774 and id<>'4501774' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69494' and id > 4501774 and id<>'4501774' order by id asc limit 5