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1-2024_Chinese: Non-destructive testing - Penetrant testing - Part 1: General principles (Chinese: 无损检测 渗透检测 第1部分：总则)
English versions: GB/T 19266-2024
English versions: GB/T 19267
1-2024_Chinese: Multimode optical fibres for telecommunication - Part 1: Sectional specification for category A1 multimode fibres (Chinese: 通信用多模光纤 第1部分：A1类多模光纤特性)
English versions: GB/T 17642-2025
GB/T 20972.3-2025 Chinese PDF (GB /T20972.3-2025) GB 5009.268-2025 1-2024_Chinese: Non-destructive testing - PenetrantGB T 20972. 3 2025_Chinese: Petroleum and natural gas industries Materials for use in H2S containing environments in oil and gas production Part 3: Cracking resistant CRAs(corrosion resistant alloys) and other alloys (Chinese: 3) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 20972. 3 2025
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