GB 4789.38-2025 Chinese PDF GB/T 22252-2024 GB/T 17670-2025_Chinese: Unified coding for

GB/T 17670-2025_Chinese: Unified coding for natural stone (Chinese: 天然石材统一编号)

3-2025_Chinese: Non-destructive testing - Ultrasonic testing block - Part 3: Calibration block for curved surface (Chinese: 无损检测 超声检测试块 第3部分：曲面检测标准试块)

English versions: GB/T 20850-2025

English versions: GB 28263-2024

GB/T 20243

GB 4789.38-2025 Chinese PDF GB/T 22252-2024 GB/T 17670-2025_Chinese: Unified coding forGB 4789. 38 2025_Chinese: National food safety standard Food microbiological examination Counting of Escherichia Coli (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB 4789. 38 2025