goaf造句
And above 90 % spontaneous combustion occurs in
goaf.
其中90%以上自然发火发生在采空区.
The coal spontaneous combustion in the
goaf is one of the main coal disasters.
采空区煤炭自燃火灾一直是我国煤矿的主要灾害之一.
The method of gas drainagecoal seam gas drainage , near coal gas drainage , and
goaf gas drainage.
瓦斯抽放的方法有本煤层抽放 、 邻近层抽放和采空区抽放.