Home / Standards / GB/T 39157-2020 GB/T 39157-2020 Active Classification and definition of the technology readiness levels for targets 靶材技术成熟度等级划分及定义 Standard Type GBT ICS 77.150.01 CCS H00 Status 现行 Issue Date 2020-11-19 Implementation 2021-10-01 Responsible Dept 中国有色金属工业协会 Drafting Unit N/A