The original ASNT Recommended Practice SNT-TC-1A was published in October 1966 and was not revised except editorially until June 1975.
最早的ASNT推荐实施细则SNT-TC-1A是1966
的。除了编辑上的错误，直至19756月未经任何
改。
The original ASNT Recommended Practice SNT-TC-1A was published in October 1966 and was not revised except editorially until June 1975.
最早的ASNT推荐实施细则SNT-TC-1A是1966的。除了编辑上的错误，直至19756月未经任何改。
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