The original ASNT Recommended Practice SNT-TC-1A was published in October 1966 and was not revised except editorially until June 1975.
最早
ASNT推荐实施细则SNT-TC-1A是1966年
。除了编辑上错误，直至1975年6月
任何修改。
The original ASNT Recommended Practice SNT-TC-1A was published in October 1966 and was not revised except editorially until June 1975.
最早ASNT推荐实施细则SNT-TC-1A是1966年。除了编辑上错误，直至1975年6月任何修改。
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