对网络用户来说，操作系统是指 。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30252' and id < 2447363 and id<>'2447363' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30252' and id > 2447363 and id<>'2447363' order by id asc limit 5