GB 4234.9-2023 Chinese PDF GB/T 33588.1-2025 13-2025_Chinese: Electronic railway equipment -

13-2025_Chinese: Electronic railway equipment - Train communication network (TCN) - Part 4-1: The test method of train communication network based on Wire Train Bus(WTB) (Chinese: 轨道交通电子设备 列车通信网络（TCN) 第4-1部分：基于绞线式列车总线（WTB）的列车通信网络试验方法)

English versions: GBZ45378-2025

4-2025_Chinese: Test methods of rare earth phosphors for LED - Part 4: Determination of high temperature and high humidity property (Chinese: LED用稀土荧光粉试验方法 第4部分：高温高湿性能的测定)

English versions: GB/T 45282-2025

21-2025_Chinese: Test method for noise of household and similar electrical appliances - Part 21: Particular requirements for oral hygiene appliances (Chinese: 家用和类似用途电器噪声测试方法 第21部分：口腔卫生器具的特殊要求)

GB 4234.9-2023 Chinese PDF GB/T 33588.1-2025 13-2025_Chinese: Electronic railway equipment -GB 4234. 9 2023_Chinese: Implants for surgery Metallic materials Part 9: Wrought high nitrogen stainless steel (Chinese: 9) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB 4234. 9 2023