A.0.6和260Kg/m3 B.0.55和280Kg/m3 C.0.50和310Kg/m3 D.0.45和330Kg/m3
A.46.9和67.0 B.47.9和67.6 C.48.12和68.5 D.48.23和69.0
A.200 B.164 C.178 D.184