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3-2025_Chinese: Metallic materials - Vickers hardness test - Part 3: Calibration of reference blocks (Chinese: 金属材料 维氏硬度试验 第3部分：标准硬度块的标定)
English versions: GB/T 45233-2025
GB/T 2812-2024_Chinese: Head protection - General test methods (Chinese: 头部防护 通用测试方法)
English versions: GB/T 4340
English versions: GB/T 45136-2024
GB/T 45305.4-2025 Chinese PDF (GB /T45305.4-2025) GB/T 23595.4-2025 3-2025_Chinese: Metallic materials - VickersGB T 45305. 4 2025_Chinese: Acoustics Laboratory measurement of sound insulation of building elements Part 4: Measurement procedures and requirements (Chinese: 4) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 45305. 4 2025
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