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| 多层抽水; 多级排水 | |||
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| 多级泵 | |||
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multi -stage pumping : 16 phrases in 6 subjects |
| Agriculture | 1 |
| Chemistry | 2 |
| Hydroelectric power stations | 9 |
| Metallurgy | 1 |
| Refrigeration | 1 |
| Technology | 2 |
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