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| 多级压缩 | |||
| 分级压缩 | |||
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stage compression : 29 phrases in 7 subjects |
| Compressors | 2 |
| Engineering geology | 1 |
| Nautical | 2 |
| Oil / petroleum | 3 |
| Refrigeration | 10 |
| Technology | 10 |
| Water resources | 1 |
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