And a complete set of product quality assurance system design and autonomous research and development capacity of the new pipe.
并且有一套完整的产品质量保证体系和自主设计研发新型管材的能力。
And a complete set of product quality assurance system design and autonomous research and development capacity of the new pipe.
并且有一套完整的产品质量保证体系和自主设计研发新型管材的能力。
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