Double wire welding and automatic ultrasonic testing ( AUT ) applied in construction of submarine pipeline were introduced.

介绍了双丝焊接技术和自动 超声波检测 技术在海底管线环焊缝焊接施工中的应用.

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Design principle, structure, operation and maintenance of ZNS 3 double wire decker were introduced in this paper.

介绍了ZNS3双网脱水机的设计原理 、 结构 、 操作与维护.

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