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出典:Wiktionary
出典:『Wiktionary』 (2024/07/17 19:37 UTC 版)
bituminous coal (uncountable)
出典:Wikipedia
出典:『Wikipedia』 (2011/08/07 20:59 UTC 版)
Bituminous coal or black coal is a relatively soft coal containing a tarlike substance called bitumen. It is of higher quality than lignite coal but of poorer quality than Anthracite.
Bituminous Coal