计算机网络的功能不包括（21)。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29740' and id < 2415538 and id<>'2415538' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29740' and id > 2415538 and id<>'2415538' order by id asc limit 5