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| 低温发动机 (指用液氢等燃料的发动机) | |||
| 低温发动机 (用液氢等燃料的火箭发动机) | |||
| 低温发动机 | |||
| cryogenic engine: 5 phrases in 2 subjects |
| Refrigeration | 1 |
| Space | 4 |
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