홈 > Term: tunnel
tunnel
A short heading excavated into the face of a coal seam; a heading or drift across the strata, or from one deposit to another.
- 품사: noun
- 분야/도메인: 광업
- 카테고리: 일반 광산; Mineral mining
- Government Agency: USBM
0
작성자
- ed.young
-
(V.I.P) 21084 포인트 - 100% positive feedback
(Milwaukee, United States)
