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| 自燃式火箭燃料; 用自燃燃料的推进系统; 双组分火箭燃料 | |||
| 自燃火箭燃料; 自燃燃料的推进系统 | |||
| 自然燃料发动机 | |||
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hypergol : 2 phrases in 2 subjects |
| Aviation | 1 |
| Space | 1 |
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