设备独立性是指 。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30162' and id < 2440362 and id<>'2440362' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30162' and id > 2440362 and id<>'2440362' order by id asc limit 5