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  • GB/T 5777-2019 无缝和焊接(埋弧焊除外)钢管纵向和/或横向缺欠的全圆周自动超声检测 Automated full peripheral ult...2023-09-06
  • DIN ISO/TR 21477-2018 Optics and photonics - Preparation of drawings for optical elements and systems - Sur...2023-08-17
  • BS ISO 10110-7-2017 光学及光学仪器.光学元件和系统图形的制备.第7部分:表面缺陷公差 Optics And Photonics. Prepa...2023-07-01
  • DIN ISO 14997-2018 Optics and photonics - Test methods for surface imperfections of optical elements (ISO 1...2023-06-11
  • BS EN ISO 10042-2018 Welding. Arc-welded joints in aluminium and its alloys. Quality levels for imperfecti...2023-06-09
  • GB/T 40385-2021 钢管无损检测 焊接钢管焊缝缺欠的数字射线检测 Non-destructive testing of steel tubes-Digital r...2023-05-26
  • GB/T 19418-2003钢的弧焊接头 缺陷质量分级指南Arc-welded joints in steel—Guidance on quality levels for impe...2022-06-08
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