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 ... 套管靴 casing shoe 特大块煤 ultra-large coal 特伦普分选点 Tromp cut-point ...
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。