goaf的例句（goaf在句子中的用法）

• There are many factors influencing spontaneous combustion in goaf and their relative essentialities are different. 采空区自然发火的影响因素很多,各因素之间的相对重要性不同.
• 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.
• 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.
• And above 90 % spontaneous combustion occurs in goaf. 其中90%以上自然发火发生在采空区.