GB/T 31126.2-2024 Chinese PDF (GB /T31126.2-2024) GB 19081-2025 2-2025_Chinese: Semi-finished spectacle lens blanks

2-2025_Chinese: Semi-finished spectacle lens blanks - Part 2: Power-variation (Chinese: 半成品镜片毛坯 第2部分：渐变焦)

GB/T 20243

English versions: GB 11555-2025

English versions: GB/T 25273-2025

maintenance and improvement of a GB/T 23331 energy management system (Chinese: 能源管理体系 实施、保持和改进GB/T 23331能源管理体系指南)

GB/T 31126.2-2024 Chinese PDF (GB /T31126.2-2024) GB 19081-2025 2-2025_Chinese: Semi-finished spectacle lens blanksGB T 31126. 2 2024_Chinese: Textiles Determination of perfluorinated and polyfluorinated compounds Part 2: Gas chromatography mass spectrometry method (Chinese: 2 ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 31126. 2 2024