opening up by inclined shafts
opening up by inclined shafts
[矿业英汉词典]
opening up by inclined shafts斜井开拓
是什么意思，opening up by inclined shafts的解释，opening up by inclined shafts的翻译
opening up by inclined shafts
[矿业英汉词典]
opening up by inclined shafts是什么意思，opening up by inclined shafts的解释，opening up by inclined shafts的翻译