DIN EN 4050-3-2012 航空航天系列.金属材料试验方法.棒材、板材、锻坯和锻件的超声波检查.第3部分:标准试块.德文和英文版本EN 4050-3-2012
Aerospace series - Test method for metallic materials - Ultrasonic inspection of bars, plates, forging stock and forgings - Part 3: Reference blocks; German and English version EN 4050-3:2012