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English versions: GB/T 31900-2024
English versions: GB/T 17670-2025
GB/T 3405-2025_Chinese: Petroleum benzene (Chinese: 石油苯)
English versions: GB/T 26250-2025
GB/T 29117-2025_Chinese: Evaluating guide for green schools (Chinese: 绿色学校评价导则)
GB/T 34874.4-2025 Chinese PDF (GB /T34874.4-2025) GB 45671-2025 English versions: GB/T 31900-2024GB T 34874. 4 2025_Chinese: Geometrical product specifications (GPS) X ray three dimensional size measuring machines Part 4: Evaluation of uncertainty in measurement (Chinese: GPS X 4) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 34874. 4 2025
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