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（　   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id < 4420863 and id<>'4420863' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id > 4420863 and id<>'4420863' order by id asc limit 5