Home / Standards / GB/T 40023-2021 GB/T 40023-2021 Active Non-destructive testing instruments—Ultrasonic time-of-flight diffraction instrument—Technical requirements 无损检测仪器 超声衍射声时检测仪 技术要求 Standard Type GBT ICS 19.100 CCS N77 Status 现行 Issue Date 2021-04-30 Implementation 2022-05-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A