Home / Standards / GB/T 23902-2009 GB/T 23902-2009 Abolished Non-destructive testing - Ultrasonic examination - Time-of-flight diffraction technique as a method for detection and sizing of discontinuities 无损检测 超声检测 超声衍射声时技术检测和评价方法 Standard Type GBT ICS 19.100 CCS J04 Status 废止 Issue Date 2009-05-26 Implementation 2009-12-01 Responsible Dept 国家标准委 Drafting Unit N/A