Home / Standards / GB/T 23908-2009 GB/T 23908-2009 Active Non-destructive testing - Practice for ultrasonic pulse-echo straight-beam testing by the contact method 无损检测 接触式超声脉冲回波直射检测方法 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 国家标准委