Hereby the safety of the combined mining of thin seams under the close gob water was evaluated.
Hereby the safety of the combined mining of thin seams under the close gob water was evaluated.
根据分析的结果评价了临界距离老空水下薄煤层联合开采的安全性。
Hereby the safety of the combined mining of thin seams under the close gob water was evaluated.
根据分析的结果评价了临界距离老空水下薄煤层联合开采的安全性。