Therefore, the strength check of multi-internal force from the cross-section of bar can be resolved by means of mechanical method.
为此，利用材料力学方法可以解决杆件横截面上存在多个内力的强度计算问题。
A laminated composite bar of rectangular cross section consists of a middle portion of one material as well as upper and lower identical cover plates of another material.
一矩形横截面的叠层复合材料杆，由以一种材料为中心部分，及另一种材料的上下两相同的盖板所组成。
According to the testing and studying, ultimate strength, elongation and shrinkage on cross section of two kinds of steel bar were determined.
通过测试研究还得到两种钢筋的极限强度、延伸率和断面收缩率等其他高温力学性能参数。
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