GB/T 39432-2020无损检测超声检测阶梯试块标准
英文:Non-destructive testing—Ultrasonic testing—Specification for step wedge calibration block GB/T 39432-2020介绍: 国家标准《无损检...
英文:Non-destructive testing—Ultrasonic testing—Specification for step wedge calibration block GB/T 39432-2020介绍: 国家标准《无损检...