GB/T 20243.2-2025 Chinese PDF (GB /T20243.2-2025) GB/T 22249-2024 English versions: GB/T 17591-2025

English versions: GB/T 17591-2025

2-2025_Chinese: Uncut finished spectacle lenses - Part 2: Power-variation (Chinese: 眼镜镜片 第2部分：渐变焦)

2-2025_Chinese: Acoustics - Measurement of the influence of road surfaces on traffic noise - Part 2: The close-proximity method (Chinese: 声学 道路表面对交通噪声影响的测量 第2部分：近距法)

3-2025_Chinese: Cardiovascular implants - Cardiac valve prostheses - Part 3: Heart valve substitutes implanted by transcatheter techniques (Chinese: 心血管植入器械 人工心脏瓣膜 第3部分：经导管植入式人工心脏瓣膜)

GB/T 12789

GB/T 20243.2-2025 Chinese PDF (GB /T20243.2-2025) GB/T 22249-2024 English versions: GB/T 17591-2025GB T 20243. 2 2025_Chinese: Acoustics Measurement of the influence of road surfaces on traffic noise Part 2: The close proximity 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 20243. 2 2025