GB/T 4074.4-2024 Chinese PDF (GB/T4074.4-2024) GB/T 45211.1-2025 English versions: GB/T 18639-2023

English versions: GB/T 18639-2023

8-2024_Chinese: Solid insulating materials - Dielectric and resistive properties - Part 8: Determination of dielectric properties(AC method) - Relative permittivity and dielectric dissipation factor(frequencies 1 MHz~300 MHz) (Chinese: 固体绝缘材料 介电和电阻特性 第8部分：测定介电特性（AC方法） 相对介电常数和介质损耗因数（频率 1 MHz~300 MHz）)

8-2022_Chinese: Information technology - Biometrics used with mobile devices - Part 8: Presentation attack detection (Chinese: 信息技术 移动设备生物特征识别 第8部分：呈现攻击检测)

GB/T 45589-2025_Chinese: Detection and identification of Tobamovirus fructirugosum (Chinese: 番茄褐色皱果病毒检疫鉴定方法)

GB/T 4074.4-2024 Chinese PDF (GB/T4074.4-2024) GB/T 45211.1-2025 English versions: GB/T 18639-2023GB T 4074. 4 2024_Chinese: Test methods of winding wires Part 4: Chemical properties (Chinese: 4) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 4074. 4 2024