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  4. Which friend has the design standard of as1657, can you share it

Which friend has the design standard of as1657, can you share it

TuKai
TuKai
哪位朋友有AS1657的设计标准，能分享一下吗
2020-04-02 Reply
阳光boy
阳光boy
国标标准中化学成分为横线,图纸上有要求，质证书上是否需要有这种化学元素的成分
2020-04-02 09:10:16 Reply
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