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.

通过对巷道顶板离层时间及规律进行分析,采用马丽散对顶板离层超范围区进行加固,取得明。

Probability integration method of stochastic media expectation theory, which bases on the foundation of flaccid up-cover terrane and bestraddle of top board, is discontinuous media theory.

随机介质预计理论概率积分法是立在履岩层软弱、顶板跨落基础连续介质理论。

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.

团溪锰矿直接顶板粘土之有一煤层，且不稳定，采后容易垮落，造成瓦斯涌出。