A.3.0kg/m3 B.3.O% C.6.0kg/m3 D.6.O%
A.200MPa B.220MPa C.240MPa D.260MPa
A.L0(lOD.、Lt≥17DL0(17D.、Lt≥ B.lOdL0(5D.、Lt≥12DL0(12D.、Lt≥5d