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| 双级泵; 串联泵 | |||
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| 二级泵; 两级水泵 | |||
| 两级水泵; 两级泵; 双级泵 | |||
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two -stage pump : 6 phrases in 3 subjects |
| Metallurgy | 4 |
| Refrigeration | 1 |
| Technology | 1 |
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