GB 21252-2023 Chinese PDF GB/T 21199-2024 English versions: GB/T 31790-2025

English versions: GB/T 31790-2025

English versions: GB/T 44981-2024

English versions: GB/T 19267

English versions: GBZ27032-2025

GB/T 45397-2025_Chinese: Information technology - Big data for ecological environment - System framework (Chinese: 信息技术 生态环境大数据 系统框架)

GB 21252-2023 Chinese PDF GB/T 21199-2024 English versions: GB/T 31790-2025GB 21252 2023_Chinese: Norm of energy consumption for unit production of architecture and sanitary ceramics and alumina grinding ball (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB 21252 2023