Lithological characteristics of the seam roof are one of factors, which lead gas content to change partially.

煤层顶板岩性特征是影响瓦斯含量产生局部变化的因素之一。

youdao

Lithological characteristics of the seam roof are one of factors, which lead gas content to change partially.

煤层顶板岩性特征是影响瓦斯含量产生局部变化的因素之一。

youdao