segment lever
摇动褶扇形杆 swing quardrant lever
打印杆扇形体 type bar segment
节流杆扇形板 throttle lever quadrant
扇形空窗撑杆 quadrant stay
导出了极坐标系下扇形截面杆件扭转问题的差分格式；用逐次超松驰迭代法求出了扭转应力函数差分值。
A torsion difference scheme of the bar with sectorial cross-section is developed in polar coordinate system.
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