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超声波的发展历程超声波形成机理的研究始于19世纪初,但它在无损检测中的应用大约是从20世纪20年代才开始。在30年代,超声波技术才广泛应用于无损检
The development of ultrasonic Ultrasonic wave formation mechanism of the study began in the early 19th century, but its application in nondestructive testing began about the 1920s. In the 1930s, ultrasonic technology was widely used in non-destructive testing