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English versions: GB/T 1634
2-2024_Chinese: Mechanical structures for electrical and electronic equipment - Outdoor enclosures - Part 2: Coordination dimensions (Chinese: 电气和电子设备机械结构 户外机壳 第2部分：协调尺寸)
75-2025_Chinese: National food safety standard - Nutrition fortifier - 6S-5-methyltetrahydrofolate
English versions: GB 45669
GB/T 21638-2025 Chinese PDF (GB /T21638-2025) GB/T 21099.4-2024 English versions: GB/T 1634GB T 21638 2025_Chinese: Microbeam analysis Guidelines for electron beam microanalysis of defects in steel materials (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 21638 2025
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