GB/T 28924-2023 Chinese PDF (GB/T28924-2023) GB/T 14663-2024 English versions: GB/T 20279-2024

English versions: GB/T 20279-2024

GB/T 16439-2024_Chinese: General specification for AC servo system (Chinese: 交流伺服系统通用技术规范)

GB/T 45462-2025_Chinese: Test methods for the performance of gas-phase air cleaning media and devices (Chinese: 气相空气净化材料及装置性能试验方法)

English versions: GB/T 30785-2025

English versions: GB/T 19274-2024

GB/T 28924-2023 Chinese PDF (GB/T28924-2023) GB/T 14663-2024 English versions: GB/T 20279-2024GB T 28924 2023_Chinese: Guides for calculating energy efficiency index for iron and steel enterprises (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 28924 2023