风管接口的连接应严密、牢固，垫片厚度不应小于（ ）mm，不应凸人管内和法兰外。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29272' and id < 2383548 and id<>'2383548' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29272' and id > 2383548 and id<>'2383548' order by id asc limit 5