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| 公开/私有: | 公开 私有 |
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- aeronautics (1)
- air pilots (1)
- airships (1)
- astronautics (1)
- aviation psychology (1)
- design and construction (1)
- history (1)
- interplanetary voyages (1)
- outer space (1)
- psychology (1)
- safety measures (1)
- social aspects (1)
- space flight (1)
- tethered satellites (1)
- 动力学分析 (1)
- 导航系统 (1)
- 无线电导航系统 (1)
- 研究 (1)
- 绳系卫星系统 (1)
- 航天导航 (1)
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