Brown coal: a low-grade coal which commonly retains the structures of the original wood. It is high in moisture, low in heat value and checks Badly upon drying.
褐煤：一种低质煤，往往保存着原来的木质结构，高水分，低热值，干燥后龟裂严重。
Brown coal: a low-grade coal which commonly retains the structures of the original wood. It is high in moisture, low in heat value and checks Badly upon drying.
褐煤：一种低质煤，往往保存着原来的木质结构，高水分，低热值，干燥后龟裂严重。
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