钢管质量证明书是企业为用户出具产品质量保证的重要文件。

Pipe quality of certificate is an important document of enterpriser to issue product quality certification to end user.

youdao

钢管质量证明书是企业为用户出具产品质量保证的重要文件。

Pipe quality of certificate is an important document of enterpriser to issue product quality certification to end user.

youdao