GB/T 21617-2023 Chinese PDF (GB/T21617-2023) GB/T 26863-2022 1-2025_Chinese: Optics and photonics -

1-2025_Chinese: Optics and photonics - Specifications for telescopic sights - Part 1: General-purpose instruments (Chinese: 光学和光子学 瞄准望远镜规范 第 1 部分：普通性能仪器)

GB/T 15604-2024_Chinese: Terminology for dust explosion prevention and protection (Chinese: 粉尘防爆术语)

4-2025_Chinese: Quality requirements for enzyme preparations - Part 4: Immobilized glucose isomerase preparations (Chinese: 酶制剂质量要求 第4部分：固定化葡萄糖异构酶制剂)

English versions: GB/T 30130-2023

GB/T 45232-2025_Chinese: Polypropylene(PP) piping systems for drainage and sewerage inside buildings (Chinese: 建筑排水排污用聚丙烯（PP）管道系统)

GB/T 21617-2023 Chinese PDF (GB/T21617-2023) GB/T 26863-2022 1-2025_Chinese: Optics and photonics -GB T 21617 2023_Chinese: Dangerous goods Test methods for oxidizing solids (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 21617 2023