shotfiring 中文意思是什麼
shotfiring
解釋
放炮-
Practice of using volley shotfiring to improve lump - coal yield
採煤工作面松動爆破提高塊煤率的實踐 -
The safe coal - miming technology for shotfiring roofcoal caving faces in medium hard coal - beds
中硬煤層炮采放頂煤的安全開采技術
分享友人