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| 活塞传驱动 | |||
| 活塞传动 | |||
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piston drive : 11 phrases in 6 subjects |
| Drilling | 1 |
| Electronics | 2 |
| Engineering geology | 3 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Technology | 3 |
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