A.αA=0.53、αB=0.13 B.αA=0.53、αB=0.20 C.αA=0.49、αB=0.13 D.αA=0.49、αB=0.20
A.178:293:792:1139:2.93 B.220:367:792:1140:3.67 C.176:293:792:1139:2.93 D.178:367:790:1139:3.67
A.≥1700kg/m3 B.≥1800kg/m3 C.≥1900kg/m3 D.≥2000kg/m3