以消除偏差为目标的绩效改进方法是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29590' and id < 2405540 and id<>'2405540' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29590' and id > 2405540 and id<>'2405540' order by id asc limit 5