就数据传输延迟而言，交换机运行在（ ）模式下延迟最大。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29470' and id < 2398772 and id<>'2398772' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29470' and id > 2398772 and id<>'2398772' order by id asc limit 5