操作系统通过（    ）来组织和管理外存中的信息[3分]

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='58033' and id < 3669175 and id<>'3669175' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='58033' and id > 3669175 and id<>'3669175' order by id asc limit 5