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| 直凉弧焊 | |||
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| 直流电弧焊接 | |||
| 直流电弧焊 | |||
| 直流电弧焊 (接) | |||
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| 直流电弧焊 | |||
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direct-current arc welding : 2 phrases in 1 subject |
| Technology | 2 |
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