GB/T 27995.2-2025 Chinese PDF (GB /T27995.2-2025) GB/T 18216.11-2024 English versions: GB/T 17215

English versions: GB/T 17215

4-2025_Chinese: Assembled spectacles - Part 4: Multifocal and power-variation near-vision spectacles (Chinese: 配装眼镜 第4部分：多焦和渐变焦老视成镜)

English versions: GB/T 22452-2025

GB/T 20236-2025_Chinese: Accelerated outdoor weathering test methods for nonmetallic materials using concentrated natural sunlight (Chinese: 非金属材料的聚光加速户外暴露试验方法)

English versions: GB/T 27069-2025

GB/T 27995.2-2025 Chinese PDF (GB /T27995.2-2025) GB/T 18216.11-2024 English versions: GB/T 17215GB T 27995. 2 2025_Chinese: Semi finished spectacle lens blanks Part 2: Power variation (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 27995. 2 2025