The dynamics principle of the sublevel mining method was investigated.
研究了分段充填采矿法的动力学原理。
Recovering coal by sublevel mining pillar and not damaging the houses on ground is introduced.
用条带开采煤柱回收煤炭资源，而不破坏地面房屋、住宅。
Recovering coal by sublevel mining pillar and not damaging the houses on ground is introduced.
用条带开采煤柱回收煤炭资源，而不破坏地面房屋、住宅。
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