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| 活塞向下行程; 下行冲程 | |||
| 向下冲程 | |||
| 活塞向下行程 | |||
| 下降行程; 头款; 定金; 下行冲程 | |||
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| 下行冲程 | |||
| down stroke: 18 phrases in 9 subjects |
| Drilling | 1 |
| General | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 3 |
| Plastics | 3 |
| Polymers | 1 |
| Swimming | 1 |
| Technology | 5 |
| Textile industry | 1 |
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