A.13MPa B.15MPa C.17MPa D.21MPa
A.2.05 B.2.15 C.2.30 D.2.55
A.4.8m B.5.3m C.5.8m D.6.3m
A.16.5kN／m3 B.17kN／m3 C.17.5kN／m3 D.18kN／m3
A.0.25 B.0.30 C.0.34 D.0.40
