用于各种碳钢钢管的环缝对接。

Fbutt welding of the carbon steel pipe.

youdao

用于各种碳钢钢管的环缝对接。

For butt welding of the carbon steel pipe.

youdao

用于各种碳钢钢管的环缝对接。

For butt welding of the carbon steel pipe.

youdao