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。
Natural ventilation system of the building can be divided into wind pressure and thermal pressure ventilation systems by driving forces.
建筑的自然通风系统由于动力的不同而分为风压通风系统和热压通风系统。
The enlarging or reconstruction requirement of existing tunnel, which can be divided into increases based on traffic flow, new ventilation or escape space, old tunnel reinforcement and so on.
既有隧道的扩挖或改建需求，大致可分为基于交通量增加、新增通风或逃生空间、老旧隧道维修补强等。
Methods: 36 patients who were diagnosed as acute exacerbation period of COPD and in need of ventilation were divided into observation group and control group with 18 patients respectively.
方法：将36例诊断为COPD急性加重期需要通气的患者随机分为观察组和对照组，每组各18例。
Methods: 36 patients who were diagnosed as acute exacerbation period of COPD and in need of ventilation were divided into observation group and control group with 18 patients respectively.
方法：将36例诊断为COPD急性加重期需要通气的患者随机分为观察组和对照组，每组各18例。
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