ultra large coal的意思|示意
特大块煤
ultra large coal的网络常见释义
特大块煤 ... 混煤 mixed coal 特大块煤 ultra large coal 大块煤 large coal ...
ultra large coal相关短语
1、 ultra-large coal 特大块煤
2、 ultra large coal detail 特大块煤
ultra large coal相关例句
The feasibility of the protective coal pillar mining in the artificial inclined steep drift in the thick (ultra thick) coal seam of a large slope is discussed.
论证了急倾斜厚(特厚)煤层伪斜上山保护煤柱回收的可行性。