“三下一上”采煤技术在理论与规律研究方面的进展与现状

Evolvement and present situation of coal mining technology under water body,building and rail,and on karst water body on theory and regularity research

介绍了“三下一上”采煤技术在理论与规律方面的进展与现状。

This paper introduces the evolvement and present situation of mining technology under water body,building and rail,and on karst water body on theory and regularity research.