每一台可以上网的计算机都必须有（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27171' and id < 2251185 and id<>'2251185' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27171' and id > 2251185 and id<>'2251185' order by id asc limit 5