GB 2099.7-2024 Chinese PDF GB/T 23528.4-2025 1-2025_Chinese: Optics and photonics -

1-2025_Chinese: Optics and photonics - Test methods for telescopic systems - Part 1: Basic characteristics (Chinese: 光学和光子学 望远镜系统试验方法 第1部分：基本特性)

English versions: GB/T 45395-2025

GB/T 9981-2025_Chinese: Hygienic specification for rural residential buildings (Chinese: 农村住宅卫生规范)

GB/T 36217-2025_Chinese: Ships and marine technology - Ship's mooring and towing fittings - Universal fairleads with upper roller (Chinese: 船舶与海上技术 船舶系泊和拖带设备 带上滚柱导缆器)

GB/T 45356-2025_Chinese: Polypropylene(PP) piping systems for non-pressure buried drainage and sewerage (Chinese: 无压埋地排污、排水用聚丙烯（PP）管道系统)

GB 2099.7-2024 Chinese PDF GB/T 23528.4-2025 1-2025_Chinese: Optics and photonics -GB 2099. 7 2024_Chinese: Cord extension socket outlets for household and similar purposes Safety technical specification (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB 2099. 7 2024