For a unit of projected area the loading on a telephone pole or a smokestack will be less than on an i-beam.
对一个单位面积来说，电线杆或烟囱上的荷载要比工字架上的荷载小。
For a unit of projected area the loading on a telephone pole or a smokestack will be less than on an I - beam.
对一个单位面积来说，电线杆或烟囱上的荷载要比工字架上的荷载小。
For a unit of projected area the loading on a telephone pole or a smokestack will be less than on an I - beam.
对一个单位面积来说，电线杆或烟囱上的荷载要比工字架上的荷载小。
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