由于一个刺激的加入而增强了某一个操作性行为发生的概率，叫作

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30326' and id < 2451912 and id<>'2451912' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30326' and id > 2451912 and id<>'2451912' order by id asc limit 5