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。

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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。

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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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