介绍了国内外复现圆度标准的方法，并就采用何种标准和复现方法进行了讨论。
In this paper, the internal and external methods of reproducing roundness standard are introduced. Adapting which standard and reproducing method is discussed.
弯管圆度应保证弯管上任何一点的外部直径不得大于标准直径的 2%。
The Out-of-roundness is not more than 2% of the outside diameter of the pipe at any point.
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