所述的直角弯头外表呈光滑的弧面。
The appearance of each square elbow presents a smooth cambered surface.
本文介绍了一种用半径为r的圆弧绘制多节等径直角弯头展开曲线的方法——圆弧法。
In this paper, a method-ARC method is introduced, by which the development chart can be drawn, of multiple-piece, equal-diameter and right-angled elbows with the radius as the arc of r.
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