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English versions: GB/T 45059-2024
English versions: GB 20072-2024
2-2024_Chinese: Acoustics - Calibration of hydrophones - Part 2: Procedures for low frequency pressure calibration (Chinese: 声学 水听器校准 第2部分：低频声压场校准方法)
English versions: GB/T 8897
English versions: GB/T 45180-2024
GB/T 45558-2025 Chinese PDF (GB /T45558-2025) GB/T 18376.2-2024 English versions: GB/T 45059-2024GB T 45558 2025_Chinese: General rules for metadata of meteorological observation (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 45558 2025
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