A.越高越好B.越長越好C.越短越好D.越粗越好
A.300m3/(m·d)B.500m3/(m·d)C.600m3/(m·d)D.1000m3/(m·d)
A.0.05-0.1m/sB.0.08-0.1m/sC.0.1-0.2m/sD.0.2-0.5m/s