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| 前置泵 | |||
| 前支泵; 预真空泵; 前置〔级〕泵; 预抽真空泵; 初步抽气泵; 预真空泵 | |||
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fore pump : 4 phrases in 3 subjects |
| General | 1 |
| Space | 1 |
| Technology | 2 |
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