low rank bitumite
... low rank anthracite 低级无烟煤 low rank bitumite 低级烟煤 low rank coal 劣质煤 ...
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低级无烟煤 low rank anthracite ; low rank bituminous coal
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从红柱石的结晶程度分析,这种无烟煤是一种低级热接触变质岩。
Having analysized the degree of crystallization of andalusite, it is believed that the anthracite is a low-grade thermal metamorphic rock.
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