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| 双面 V 形对焊接; X 型焊接 | |||
| 双 V 形对接焊缝 | |||
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| 双 V 形对接焊缝; X形对接焊缝 | |||
| 双面V形对焊接; 双V形接头 | |||
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| X形对按接头; 双面V形对接接头; X形对接按头 | |||
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double V -butt joint : 1 phrase in 1 subject |
| Technology | 1 |
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