Soft coal

From Opengenome.net
Revision as of 17:34, 13 February 2006 by Yslee (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

무연탄중에서 질이 부드러운 휘탄을 가르킨ㄷ.

역천탄이나 갈탄도 때로는 포함이 된다.

Retrieved from "http://Opengenome.net/index.php?title=Soft_coal&oldid=6479"