coal pillar mining的意思|示意
煤柱开采
coal pillar mining的网络常见释义
带煤柱开采 ... coal-mining methods 采煤方法 coal pillar mining 带煤柱开采 opencast coal-mining 露天采煤. ...
coal pillar mining相关短语
1、 coal pillar mining under stress 煤柱应力下开采
2、 strip extraction coal-pillar mining 条采煤柱回收
3、 pillar coal mining method 柱式采煤法