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English versions: GB 45549-2025
English versions: GB/T 26838-2024
English versions: GB/T 45351-2025
English versions: GB/T 26382-2024
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)
GB/T 8564-2023 Chinese PDF (GB/T8564-2023) GB/T 18910.2-2024 English versions: GB 45549-2025GB T 8564 2023_Chinese: Technical specification for installation of hydraulic turbine generator unit (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 8564 2023
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