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- mechanical engineering (3)
- handbooks, manuals, etc (2)
- astronautics (1)
- cooperation (1)
- economic aspects (1)
- entrepreneurship (1)
- historiography (1)
- history (1)
- information technology (1)
- machine-shop practice (1)
- sovietologists (1)
- space race (1)
- 信号检测 (1)
- 技术手册 (1)
- 教材 (1)
- 机械元件 (1)
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- 调制技术 (1)
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