A.不粘煤 B.长焰煤 C.无烟煤 D.硬煤
A.泥炭 B.褐煤 C.烟煤 D.无烟煤
A.100mm B.80mm C.60mm D.50mm
A.50m B.100m C.200m D.300m
A.11-20mm B.10-20mm C.13-25mm D.20-35mm
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