Each of such bodies as tunnel lining, road way and road surface floorslab has only one inspection face, and the shock echo method has become a new technique for detecting thickness and defects.
英
美
释义
摘要隧道衬砌、路道、路面楼板等只有一个检测面,冲击回波法成为新的厚度及缺陷检测方法。
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