计算机系统中，各种数据和命令传输的公共通道称为（

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31815' and id < 2542840 and id<>'2542840' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31815' and id > 2542840 and id<>'2542840' order by id asc limit 5