Home / Standards / GB/T 23900-2009 GB/T 23900-2009 Active Non-destructive testing - Practice for measuring ultrasonic velocity in materials 无损检测 材料超声速度测量方法 Standard Type GBT ICS 19.100 CCS J04 Status 现行 Issue Date 2009-05-26 Implementation 2009-12-01 Responsible Dept 国家标准委 Drafting Unit N/A