由于曲率的影响，曲线梁在其曲率平面内弯曲时的中性轴不通过横截面的形心。因此弯矩在形心处要引起正应力，从而引出所谓“等效轴力”的概念。
When a curved beam is bending in the plane of the curvature, the neutral axis of cross section is not identical with the axis of gravity due to the influence of the initial curvature.
本文利用转轴公式，对正多边形截面的任一形心轴均为其形心主惯性轴的结论进行证明，并对其在理论分析中的应用进行探讨。
This article tries to show, with the help of the formula of rotated axes, that centroidal axes of equilateral polygon is the centroidal axes and gives the research on its application.
并且有三角形、五角星、心形印章可提供宝宝随意涂鸦，培养宝宝的画画兴趣和多方面的求知欲。
And there is a triangle, five-pointed star, heart-shaped baby seal provides free graffiti, paint your baby's interest and foster a wide range of intellectual curiosity.
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