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| 公开/私有: | 公开 私有 |
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| 公开/私有: | 公开 私有 |
- 研究 (3)
- design and construction (2)
- 盾构法 (2)
- 隧道工程 (2)
- aeronautics (1)
- air weapons (1)
- air-to-surface missiles (1)
- airplanes, military (1)
- armament (1)
- bridges (1)
- control systems (1)
- drone aircraft (1)
- electric boats (1)
- equipment and supplies (1)
- history (1)
- ship propulsion, electric (1)
- systems engineering (1)
- systems integration (1)
- 下水 (1)
- 儿童读物 (1)
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