单项选择题
A.90%-98%B.80%-98%C.75%-90%D.65%-75%
A.75%-90% B.65%-80% C.60%-75% D.50%-60%
A.贫煤、瘦煤、焦煤、肥煤、气煤、不粘煤及长焰煤 B.贫煤、瘦煤、焦煤、肥煤、气煤、弱粘煤、不粘煤及长焰煤 C.贫煤、瘦煤、焦煤、肥煤、气煤 D.瘦煤、焦煤、肥煤、气煤、不粘煤
A.0-10% B.0-15% C.0-20% D.0-25%
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