preparation stage of [underground] mine construction
preparation stage of [underground] mine construction
[煤炭科技英汉词典]
preparation stage of [underground] mine construction矿井施工准备期
矿井建设从办妥土地征购、施工人员进场开始到一个井筒正式开工之日止的全部时间。
是什么意思，preparation stage of [underground] mine construction的解释，preparation stage of [underground] mine construction的翻译