将文氏电桥振荡器的选频网络去掉，换上一根导线，则该电路（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30217' and id < 2444250 and id<>'2444250' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30217' and id > 2444250 and id<>'2444250' order by id asc limit 5