丰满人妻精品国产99aⅴ,国产精品高清一区二区三区不卡,欧美激情一区二区三区,精品少妇一区二区三区免费观

行業(yè)動態(tài)
2019年12月，自然資源部出臺《關于推進礦產(chǎn)資源管理改革若干事項的意見》，明確提出改革礦產(chǎn)資源儲量分類。
News Information
Current Location：Home > News Information

Ju Jianhua, Director of the Mineral Resources Protection Supervision Department of the Ministry of Natural Resources: There are 11 changes in the new standard of "Classification of Solid Mineral Resources Reserves"

Release Time：2020-05-15   Edit：ZHK   Access：4888
Key Word：固體礦產(chǎn)資源
Product List