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coal rank
Classification according to degree of metamorphism or progressive alteration, in the natural series from lignite to anthracite; higher rank coal is classified according to fixed carbon on a dry basis; lower rank coal according to Btus on a moist basis.
- 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
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(Milwaukee, United States)