截面尺寸(mm) 截面面积理论重量高度h截面宽度b卷边宽c厚度t(cm2)(kg/m)80451023.572.88045102.34.053.188045102.54.363.428045102.754.733.7280451035.14.011005015-2024.473.511005015-202.35....