顶板

Shingles are often dipped in creosote.

屋顶板常浸涂木焦油。

Through Analysis on roadway roof separation time and law,Adoption malison reinforcing roadway roof separation Exceed the range area,Make the obvious result.

通过对巷道顶板离时间及规律进行分析,采用马丽散对顶板离围区进行加固,取得明显效果。

There is a coal layer on the clay of direct roof.This layers is unstable and easy tofall down after mining and enable the gas to gush out.

团锰矿的直接顶板粘土之上有一，不稳定，采后容易垮落，造成瓦斯涌出。