施加深度负反馈可使运放进入（ ）；令运放开环或加正反馈可使运放进入)0

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30217' and id < 2444204 and id<>'2444204' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30217' and id > 2444204 and id<>'2444204' order by id asc limit 5