排烟管道在未采取隔热防火措施时，应与可燃物保持不小于（ ）mm的距离。[单选]

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29215' and id < 2377521 and id<>'2377521' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29215' and id > 2377521 and id<>'2377521' order by id asc limit 5