This paper, take the production of bellows for example, introduce the method of variable coefficient extension.

此文以波纹管生产为例，介绍了变系数拉伸法。

youdao

This paper, take the production of bellows for example, introduce the method of variable coefficient extension.

此文以波纹管生产为例，介绍了变系数拉伸法。

youdao