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lauaurora 发表于 2016-10-12 19:50:35

AWS A2.4 Standard Symbols for Welding, Brazing, and Nondestructive Examination

美标焊接，钎焊以及无损检测符号表示，难得一见的好标准。

admin 发表于 2016-10-13 16:37:02

谢谢您的分享,金币已奖励!

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