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| 公开/私有: | 公开 私有 |
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| 公开/私有: | 公开 私有 |
- astronautics (3)
- drone aircraft (2)
- human factors (2)
- remote sensing (2)
- space vehicles (2)
- 普及读物 (2)
- aerodynamics, supersonic (1)
- air travel (1)
- air warfare (1)
- aircraft gas-turbines (1)
- airplanes (1)
- cameras (1)
- drone warfare (1)
- earth (planet) (1)
- electrostatic charging (1)
- environmental monitoring (1)
- equipment and supplies (1)
- geomorphology (1)
- government policy (1)
- jet propulsion (1)
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