GB/T 13511.4-2025 Chinese PDF (GB /T13511.4-2025) GB 28050-2025 5-2025_Chinese: Uncut finished spectacle lenses

5-2025_Chinese: Uncut finished spectacle lenses - Part 5: Abrasion-resistant of surfaces test methods (Chinese: 眼镜镜片 第5部分：表面耐磨试验方法)

English versions: GB 45185-2024

English versions: GB 45671-2025

3-2025_Chinese: Norm of water intake for industry in the Yellow River basin - Part 3: Coal to olefin (Chinese: 黄河流域工业用水定额 第3部分：煤制烯烃)

GB/T 15470

GB/T 13511.4-2025 Chinese PDF (GB /T13511.4-2025) GB 28050-2025 5-2025_Chinese: Uncut finished spectacle lensesGB T 13511. 4 2025_Chinese: Assembled spectacles Part 4: Multifocal and power variation near vision spectacles (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 13511. 4 2025