balance between tunneling and mining in coal pits是什麼意思、英文翻譯及中文解釋
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balance between tunneling and mining in coal pits
詞語： balance between tunneling and mining in coal pits
解釋： 採掘比例關係
詞典： 商務專業英漢詞典
balance between tunneling and mining in coal pits 相關解釋
採掘比例關係 balance between tunneling and mining (in coal pits);ratiobetween cutting and tunneling
採掘比例關係 balance between tunneling and mining (in coal pits);ratiobetween cutting and tunneling
