乌黑透亮的煤是好煤，有时煤块很容易捏碎；那些含有黄色的煤含硫太高，烧起来味道很臭，不好，并且里面石块很多。

来源: happybob 于 2019-02-02 21:01:37 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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