thickness of coal seam
thickness of coal seam
[煤炭科技英汉词典]
thickness of coal seam煤层厚度
煤层顶底板之间的垂直距离。
是什么意思，thickness of coal seam的解释，thickness of coal seam的翻译
thickness of coal seam
[煤炭科技英汉词典]
thickness of coal seam是什么意思，thickness of coal seam的解释，thickness of coal seam的翻译