A.150m B.100m C.50m D.200m
A.泥炭 B.褐煤 C.烟煤 D.无烟煤
A.瘦煤 B.肥煤 C.焦煤 D.烟煤
A.细煤 B.矸石 C.残渣 D.末煤
A.11-20mm B.10-20mm C.13-25mm D.20-35mm
