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GB/T 18029
English versions: GB/T 20914
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 45399-2025
GB/T 43295-2023 Chinese PDF (GB/T43295-2023) GB/T 2773-2025 GB/T 18029GB T 43295 2023_Chinese: Education and learning services Requirements for distance learning (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 43295 2023
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