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English versions: GB 32032-2024
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 34430
English versions: GB/T 16843-2023
English versions: GB/T 44911-2024
GB/T 3836.22-2023 Chinese PDF (GB/T3836.22-2023) GB/T 21461.2-2023 English versions: GB 32032-2024GB T 3836. 22 2023_Chinese: Explosive atmospheres Part 22: Protection of equipment and transmission system using optical radiation (Chinese: 22) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 3836. 22 2023
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