Application of Deep-hole Pre-splitting Blast and Coal Body Reinforcement Technique by Metal Skeleton and Grouting in a Face by Crosscut for Exposing Coal Seam是什麼意思_Application of Deep-hole Pre-splitting Blast and Coal Body Reinforcement Technique by Metal Skeleton and Grouting in a Face by Crosscut for Exposing Coal Seam在線翻譯_英語_讀音_用法_例句