China 'GB/T 23902-2009
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 23902-2009
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
Issued Date:2009-05-26
Implemented Date:2009-12-01
Issued by:
The Standardization Administration of the People's Republic of China