烏黑透亮的煤是好煤，有時煤塊很容易捏碎；那些含有黃色的煤含硫太高，燒起來味道很臭，不好，並且裏麵石塊很多。

來源: happybob 於 2019-02-02 21:01:37 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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