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| 联二齿轮 | |||
| 双联齿轮; 双齿轮; 双层齿轮 | |||
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двойная шестерня : 11 phrases in 4 subjects |
| General | 5 |
| Jet engines | 4 |
| Oil and gas technology | 1 |
| Technology | 1 |
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