small-scale coal mine 中文意思是什麼
small-scale coal mine
解釋
小煤窯-
Research on small scale structures in working face of coal mine
褶皺中和面對煤層的控制性研究 -
Grasping the chances and strengthening works to realize the inversion of small scale coal mine
抓住機遇加強工作實現小型煤礦安全生產穩定好轉
分享友人