2. Gob collapse is the most serious geological disaster type in Mencheng Town, Beijing. 采空地面塌陷是门城镇地区危害性最严重的地质灾害类型。
3. Introduced the technology to control the roof in the gob with man-forced deep drilling and explosion in 14#coal seam as well as to analyze the effect. 介绍14号层人工强制深孔爆破处理采空区顶板的技术以及在实践中得出的经验,并对其效果进行了分析。
英英解释
n.
1. a man who serves as a sailor
2. a lump of slimy stuff
3. informal terms for the mouth