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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 34630.4-2017 |
Friction stir welding—Aluminium and its alloys—Part 4：Specification and qualification of welding procedures 搅拌摩擦焊 铝及铝合金 第4部分：焊接工艺规程及评定 |
China National Standards 4：Specification |
 English PDF |
| GB/T 15306.4-2008 |
Indexable inserts for cutting tools - Ceramic inserts with rounded corners - Part 4：Specifications 陶瓷可转位刀片 第4部分：技术条件 |
China National Standards 4：Specification |
English PDF |
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