更新时间：2024-05-07 01:02:45
- undercutting technique of network information
- Undercut relief and lead-in chamfers.
- undercutting with shallow overburden
- undercut
- undercutting under shallow overburden
- undercut-and-fill mining method
- undercutting under super-shallow overburden
- undercutting under shallow cover
- undercutting in shallow-bedded zone
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