1) iso-diameter elbow
等径弯头
2) curved pipe connector with egual diameter
等径弯管接头
1.
The paper deals with computing principle and plotting method on the development of a curved pipe connector with egual diameter according to the principle of descriptive geometry and the method of approximate development resolved a curved surface.
文章根据画法几何原理和将曲面分成诸多分块进行逼近展开的方法，论述了一种等径弯管接头展开图的计算原理和绘制方法该原理和方法概念直观清晰，编程简便文章中给出了程序设计框图和实
3) medium sweep elbow
中等弯曲半径弯头
5) wide return bend
宽径弯头
6) long sweep ell
大弯管半径弯头
补充资料：径径
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