This paper studies a series of diameter coefficients of sewing threads which are widely used in China.

本文对我国常用的几种缝纫线的直径和直径系数进行了研究。

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This paper studies a series of diameter coefficients of sewing threads which are widely used in China.

本文对我国常用的几种缝纫线的直径和直径系数进行了研究。

youdao