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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 18029
English versions: GB/T 23713
74-2025_Chinese: National food safety standard - Nutrition fortifier - L-methionine (Chinese: 食品安全国家标准 食品营养强化剂 L-蛋氨酸(L-甲硫氨酸))
GB/T 22459
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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