采用压入式通风时，风筒口距工作面在10米以内较适宜。
As forced draught was used, a distance less than 10 m from the venting duct to heading face was suitable.
一口钟分为钟体或者钟筒、钟舌和钟耳几部分。
A bell is divided into the body or barrel, the clapper, and the cannon.
对筒型压缩机的圆柱形出风管焊接坡口加工工艺进行了探讨，提出了解决该问题的有效方法。
Research is carried out on weld groove machining technology of cylindrical duct outlet for barrel compressor, the effective method of solving the problem is put forward.
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