bituminous coal

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  • na.烟煤
  • Web沥青煤;生煤;类烟煤
na.
1.
烟煤

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Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard