The surface quality of the spiral weld pipe is as so critical a quality assurance element as its interior quality.

螺旋焊管的表面质量与其内在质量同样是焊管质量的重要保证因素。

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The surface quality of the spiral weld pipe is as so critical a quality assurance element as its interior quality.

螺旋焊管的表面质量与其内在质量同样是焊管质量的重要保证因素。

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