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| thrust ratio of ducted propeller | |||
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推力比 : 35 phrases in 10 subjects |
| Aerohydrodynamics | 1 |
| Automobiles | 1 |
| Aviation | 11 |
| Earth sciences | 1 |
| Electronics | 1 |
| Missiles | 1 |
| Navigation | 1 |
| Space | 7 |
| Sports | 1 |
| Technology | 10 |
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