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burned
Said of slate or other impurity that adheres tightly to coal. Similarly, coal is said to be "burned to the roof" when it is hard to separate the roof rock from the coal.
- 词性: adjective
- 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)