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4-2025_Chinese: Acoustics - Laboratory measurement of sound insulation of building elements - Part 4: Measurement procedures and requirements (Chinese: 声学 建筑构件隔声的实验室测量 第4部分：测量程序和要求)
English versions: GB/T 45039-2024
English versions: GB/T 44921-2024
English versions: GB/T 17643-2025
English versions: GB/T 44935-2024
GB/T 26711-2024 Chinese PDF (GB/T26711-2024) GB/T 16702.5-2025 4-2025_Chinese: Acoustics - Laboratory measurementGB T 26711 2024_Chinese: Microporous nib pens (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 26711 2024
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