螺旋管的周长、直径等参数对于螺旋管的质量非常重要。

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

youdao

螺旋管的周长、直径等参数对于螺旋管的质量非常重要。

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

youdao