A.1 B.2 C.3 D.4
A.7 B.8 C.9 D.6
A.1‰ B.2‰ C.3‰ D.4‰
A.2~5m B.5~10m C.10~15m D.15~20m
A.18Kg/m B.24Kg/m C.30Kg/m D.38Kg/m
A.5 B.4 C.3 D.2