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| 真空排气系统 | |||
| 真空抽气系统 | |||
| 抽真空系统 | |||
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| 真空荥系统 | |||
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| 抽真空装置; 抽真空系统 | |||
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| 真空泵系统 | |||
| vacuum pumping system: 6 phrases in 4 subjects |
| Electronics | 3 |
| General | 1 |
| Nautical | 1 |
| Technology | 1 |
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