Reinforce hollow metal units to receive surface - applied hardware, Drilling and tapping for surface - applied finish hardware may be done at project site.
加固中空金属单位需要安装表面应用五金的，其钻孔和定型可以在工程现场实行。
Calculates the cross sectional inertia for circular cross sections (hollow and filled). All units must be consistent.
计算圆形横截面(空心和实心)的惯性。所有单位必须一致。
Calculates the cross sectional inertia for rectangular cross sections (hollow and filled). All units must be consistent.
计算矩形横截面(空心和实心)的惯性。所有单位必须一致。
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