This paper divided mine ventilation optimization into two types.
本文将矿井通风优化分为两类。
According to the fire ventilation, enclosure fires can be divided into two regimes: well-ventilated and under-ventilated combustion.
根据通风条件不同，受限燃烧可分为燃料控制和通风控制两种燃烧状况。
But even if it is a ventilation pipe is also divided into several, there is a simple dust, smoke, exhaust pipe, but also have a special rule out harmful gas pipeline.
但就算是通风管道也分成好几种，有简单除尘、排烟、吸油的排风管，但也有专门排除有害气体的管道。
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