coal seam methane content

• 煤层瓦斯含量

coal seam methane content的用法和样例：

例句

1. This study provides a scientific method about studying the gas content of the coal seam unmined and provides the basic data about the safe mining.
   这为未开采煤层瓦斯含量的研究提供了科学方法，并为该煤矿的安全开采提供了基础资料。
2. Under gassy coal seam condition, the full-heading development is employed.Because of the fast heading a high rate of gas emission arises.
   在瓦斯含量较大的煤层采用综掘掘进巷道，由于掘进速度快，出现了瓦斯涌出量过大的现象。