reamer-pillar coal mining method的意思|示意
美 / /
英 / /
扩眼柱采煤法
reamer-pillar coal mining method的网络常见释义
刀柱式采煤法 ... coal pillar of the old mining area 老区煤柱 reamer-pillar coal mining method 刀柱式采煤法 repeated mining coal-pillar 复采煤柱 ...