A.5m B.8m C.10m D.15m
A.褐煤,長(zhǎng)焰煤,氣煤,焦煤,無(wú)煙煤 B.褐煤,肥煤,氣煤,焦煤,無(wú)煙煤 C.褐煤,貧煤,肥煤,焦煤,無(wú)煙煤 D.泥炭,褐煤,氣煤,焦煤,貧煤
A.100mm B.100-200mm C.150-250mm D.200mm以上