sectrix curve
角等分线 angular r bisector
中心角等分线 radial division line
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任意角任意等分仪由渐开线板（3），T形线尺（2）和等分刻度线板（1）三个等分角度的零件及辅助零件组成。
The arbitrary angle arbitrarily bisector is composed of an involute board (3), a T-shaped line ruler (2), three equal division angle parts of an evenly divided line plate (1), and an auxiliary part.
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