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| 对动螺旋; 连接螺丝 | |||
| 管接头对动螺纹 | |||
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| 管接头对动螺纹 | |||
| union screw: 6 phrases in 3 subjects |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Technology | 2 |
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