A new critical moment formula of tapered beam is proposed, which is similar to the expression for beams with uniform cross-section.
提出了新的变截面梁临界弯矩计算式，其表达形式与等截面梁的公式相同，便于工程应用。
The most important issue for the problem of uniform cross-section bar torsion is the calculation of shear stress on the boundary of cross-section, which is very difficult.
对等截面直杆扭转问题，横截面边界上的剪应力计算是件困难的事，也是很重要的研究课题。
Polyester fibers have a smooth, uniform surface with no striations and are circular in cross section.
聚酯纤维表面均匀光滑，无条纹，横截面呈圆形。
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