It discusses a special case that the inertial circle becomes a point, and determines the places of the special points at any general section.
讨论了惯性圆退化为一点的特殊情形，就任意截面确定了截面特殊点的位置。
It discusses a special case that the inertial circle becomes a point, and determines the places of the special points at any general section.
讨论了惯性圆退化为一点的特殊情形，就任意截面确定了截面特殊点的位置。
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