单项选择题
A.≤6.00% B.≤4.00% C.6.01%~9.00% D.>9.00%
A.烟煤、煤泥 B.烟煤和无烟煤 C.各种煤 D.烟煤和褐煤
A.0.1 B.0.01 C.0.5 D.0.2