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| 机头传动 | |||
| head drive: 45 phrases in 9 subjects |
| Badminton | 1 |
| Coal | 1 |
| Drilling | 6 |
| Electric machinery | 1 |
| Engineering geology | 5 |
| General | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 5 |
| Technology | 24 |
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