我公司原来从没加工过不锈钢锥形钢管，在国内也没有先例。

I originally had never processed stainless steel cone tube in China but also without precedent.

youdao

我公司原来从没加工过不锈钢锥形钢管，在国内也没有先例。

I originally had never processed stainless steel cone tube in China but also without precedent.

youdao