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| 固体发动机; 固体燃料火箭发动机 | |||
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solid motor : 50 phrases in 7 subjects |
| Aviation | 6 |
| Earth sciences | 1 |
| Electric machinery | 3 |
| Electronics | 2 |
| General | 1 |
| Space | 33 |
| United States | 4 |
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