FP型激光器对光进行反馈和选频作用的部件是 。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30263' and id < 2448195 and id<>'2448195' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30263' and id > 2448195 and id<>'2448195' order by id asc limit 5