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| 左旋螺钉 | |||
| 左旋螺杆 | |||
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| 左旋螺钉; 左螺旋 | |||
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left-handed screw : 7 phrases in 6 subjects |
| Architecture | 1 |
| Bridge construction | 1 |
| Drilling | 1 |
| Engineering geology | 1 |
| Metallurgy | 1 |
| Technology | 2 |
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