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| 机械增压泵 | |||
| 罗茨泵 | |||
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Roots pump : 7 phrases in 6 subjects |
| Aviation | 1 |
| Construction | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Refrigeration | 1 |
| Space | 1 |
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