常用的虛拟存储器由（）两级存储器组成。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30130' and id < 2438248 and id<>'2438248' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30130' and id > 2438248 and id<>'2438248' order by id asc limit 5