探索有效的特厚复杂结构煤层小块段的开采方式，可提高效益，降低消耗，开采简单，便于生产。

The effective mining method at small piece section of superhigh and complicated seam is explored.

youdao

探索有效的特厚复杂结构煤层小块段的开采方式，可提高效益，降低消耗，开采简单，便于生产。

The effective mining method at small piece section of superhigh and complicated seam is explored.

youdao