coal seam造句

The average UK coal seam is one metre thick.
英国煤层的平均厚度为1米。

Coal Mine, its coal seam is easily spontaneous fire.
大雁二矿煤种为褐煤, 属易自燃发火煤层.

Factors affected coal seam permeability change and its law is analyzed.
分析了煤层透气性变化的影响因素及变化规律.