Through practices and theoretical analyses, it is proved that inferior bituminous coal is a particular kind of hard igniting bituminous coal, it should be differed from bituminous coal.
通过实践和理论分析，证明了劣质烟煤是一种难着火的煤种，应与烟煤区别开来。
Through practices and theoretical analyses, it is proved that inferior bituminous coal is a particular kind of hard igniting bituminous coal, it should be differed from bituminous coal.
通过实践和理论分析，证明了劣质烟煤是一种难着火的煤种，应与烟煤区别开来。
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