Some parameters, such as perimeter, diameter, is very important to quality of spiral welded pipe.

螺旋管的周长、直径等参数对于螺旋管的质量非常重要。

youdao

Some parameters, such as perimeter, diameter, is very important to quality of spiral welded pipe.

螺旋管的周长、直径等参数对于螺旋管的质量非常重要。

youdao