实现将现实世界抽象为信息世界的是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30102' and id < 2437030 and id<>'2437030' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30102' and id > 2437030 and id<>'2437030' order by id asc limit 5