GB/T 19520.22-2023 Chinese PDF (GB/T19520.22-2023) GB/T 45217-2025 English versions: GB/T 43982

English versions: GB/T 43982

English versions: GB/T 23453-2025

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)

GB 17167-2025_Chinese: General rules for energy measuring instrument equipping and managing of energy user (Chinese: 用能单位能源计量器具配备和管理通则)

power supply units and combinations thereof - Part 5: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers for general applications (Chinese: 变压器、电抗器、电源装置及其组合的安全 第5部分：一般用途隔离变压器和内装隔离变压器的电源装置的特殊要求和试验)

GB/T 19520.22-2023 Chinese PDF (GB/T19520.22-2023) GB/T 45217-2025 English versions: GB/T 43982GB T 19520. 22 2023_Chinese: Mechanical structures for electrical and electronic equipment Dimensions of mechanical structures of the 482. 6 mm (19 in) series Part 3 110: Residential racks and cabinets for smart houses (Chinese: 482. 6 mm(19 in) 3 110) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 19520. 22 2023