The stope downward ventilation technique has been used under different conditions in many places of our country.
回采工作面下行通风在我国许多地方的不同条件下均有使用。
However, when the fire happens, the downward ventilation can often cause the air disorder and air inversion easily.
但下行通风在发生火灾时往往会引起风流紊乱，容易造成风流逆转。
However, when the fire happens, the downward ventilation can often cause the air disorder and air inversion easily.
但下行通风在发生火灾时往往会引起风流紊乱，容易造成风流逆转。
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