upcast rentilating shaft
upcast rentilating shaft
[矿业英汉词典]
upcast rentilating shaft出风井
是什么意思,upcast rentilating shaft的解释,upcast rentilating shaft的翻译
upcast rentilating shaft
[矿业英汉词典]
upcast rentilating shaft是什么意思,upcast rentilating shaft的解释,upcast rentilating shaft的翻译