GB/T 17554.1-2025 Chinese PDF (GB /T17554.1-2025) GB/T 19212.2-2025 2-2025_Chinese: Plastics - Impact-resistant polystyrene

2-2025_Chinese: Plastics - Impact-resistant polystyrene (PS-I)moulding and extrusion materials - Part 2: Preparation of test specimens and determination of properties (Chinese: 塑料 抗冲击聚苯乙烯（PS-I）模塑和挤出材料 第2部分：试样制备和性能测定)

GB 45185-2024_Chinese: Optometry products - Safety technical specifications of finished spectacles (Chinese: 眼视光产品 成品眼镜安全技术规范)

GB/T 12789

GB 17741-2025_Chinese: Evaluation of seismic safety for engineering sites (Chinese: 工程场地地震安全性评价)

GB/T 20604-2025_Chinese: Natural gas - Vocabulary (Chinese: 天然气 词汇)

GB/T 17554.1-2025 Chinese PDF (GB /T17554.1-2025) GB/T 19212.2-2025 2-2025_Chinese: Plastics - Impact-resistant polystyreneGB T 17554. 1 2025_Chinese: Cards and security devices for personal identification Test methods Part 1: General characteristics (Chinese: 1) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 17554. 1 2025