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- astronautics (9)
- congresses (9)
- 研究 (5)
- aeronautics (4)
- airframes (4)
- airplanes (4)
- design and construction (4)
- space vehicles (4)
- space flight (3)
- 基本知识 (3)
- 无人驾驶飞机 (3)
- 飞机 (3)
- aerodynamics (2)
- aircraft accidents (2)
- artificial satellites in telecommunication (2)
- data processing (2)
- human factors (2)
- investigation (2)
- propulsion systems (2)
- satellite solar power stations (2)
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