单词：coal seam methane content
coal seam methane content的用法和样例：
例句
- 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。
- 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。
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