下列属于学习精加工策略的有（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31727' and id < 2538897 and id<>'2538897' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31727' and id > 2538897 and id<>'2538897' order by id asc limit 5