underhand stope 中文意思是什麼
underhand stope
解釋
下向回採-
Comprehensive gas control in high - output and efficient fully mechanized underhand stope with caving mining
高產高效俯采綜放面瓦斯綜合治理 -
Test and study on increasing the blasting efficiency of underhand cutting and filling method in hexagon stope in longshou mine
提高龍首礦下向六角形進路式采礦爆破效率試驗研究
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