A.5~10m B.8~15m C.10~20m D.20~40m
A.Gd=110MPa,μd=0.48 B.Gd=133MPa,μd=0.46 C.Gd=260MPa,μd=0.44 D.Gd=469MPa,μd=0.42
A.58mm B.68mm C.75mm D.85mm
A.52.2kPa B.55.2kPa C.56.2kPa D.60.2kPa
A.880 B.850 C.800 D.780