Permeability of coal bed is one of the critical factors involving coal bed structure and development of cleating.

其中煤层的渗透性是关键因素之一，包括煤体结构和割理发育程度两个方面。

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Permeability of coal bed is one of the critical factors involving coal bed structure and development of cleating.

其中煤层的渗透性是关键因素之一，包括煤体结构和割理发育程度两个方面。

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