首页 > Term: underearth
underearth
A hard fireclay forming the floor of a coal seam. See: underclay.
- 词性： noun
- 行业/领域： 采矿
- 类别 一般矿业; Mineral mining
- Government Agency: USBM
0
创建者
- ed.young
-
(V.I.P) 21084 分数 - 100% positive feedback
(Milwaukee, United States)
