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component of coal
Layers or bands that are petrographic entities, recognizable visually as bands or layers of coal that have distinctive physical appearance and characteristic microstructural features from coal to coal.
- 词性: noun
- 行业/领域: 采矿
- 类别 一般矿业; Mineral mining
- Government Agency: USBM
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创建者
- ed.young
- 100% positive feedback
(Milwaukee, United States)