Based on the three circle arc tip.
基于三圆弧新型线叶片。
Also the curves can express the circle arc and ellipse arc and can construct rotate surfaces.
同时它还能精确表示圆弧、椭圆弧等二次曲线，推广到空间即可以表示旋转曲面。
Two kinds of new special measuring tools for measuring the radius of non entire circle arc are designed.
设计了两种测量非完整圆弧半径的新型专用量具。
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