负反馈放大器的闭环增益方程是（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30217' and id < 2444219 and id<>'2444219' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30217' and id > 2444219 and id<>'2444219' order by id asc limit 5