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| 公开/私有: | 公开 私有 |
- 技术经济学 (2)
- 研究 (2)
- aeronautics, military (1)
- automation (1)
- bombing, aerial (1)
- civilization, medieval (1)
- conservatism (1)
- employees (1)
- middle ages (1)
- precision bombing (1)
- progressivism (united states politics) (1)
- rome (1)
- self-actualization (psychology) (1)
- self-confidence (1)
- social change (1)
- technological innovations (1)
- technology (1)
- wisconsin (1)
- wordless picture books (1)
- world war, 1939-1945 (1)
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