理论重量 表面积 kg/m M2/t 1 ∟2*3 0.889 91.789 2 ∟2*4 1.145 71.266 3 ∟2.5*3 1.124 90.747 4 ∟2.5*4 1.459 69.911 5 ∟3*3 1.373 89.148 6 ∟3*4 1.786 68.533 7 ∟3.6*3 1.656 88.472 8 ∟3.6*4 2.163 67.784 9 ∟3.6*5 2.654 55.203 10 ∟4*3 1.852 88.121 11 ∟4*4 2.422 67.382 12 ∟4*5 2.976 54.839 13 ∟4.5*3 2.088 87.931 14 ∟4.5*4 2.736 67.105 15 ∟4.5*5 3.369 54.497 16 ∟4.5*6 3.985 46.073 17 ∟5*3 2.332 87.479 18 ∟5*4 3.059 6