Finished pipe materials and special thick-walled tube 18000 tons, forming a middle class.

材质的成品管及特殊厚壁管18000吨，形成了产。

youdao

Finished pipe materials and special thick-walled tube 18000 tons, forming a middle class.

材质的成品管及特殊厚壁管18000吨，形成了产。

youdao