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GB/T 45305.4-2025 Chinese PDF (GB /T45305.4-2025)
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GB/T 45305.4-2025 Chinese PDF (GB /T45305.4-2025)
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GB/T 45305.4-2025 Chinese PDF (GB /T45305.4-2025)GB 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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