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保障系统 : 113 phrases in 14 subjects |
| Air defense | 1 |
| Animal husbandry | 1 |
| Astronautics | 1 |
| Automobiles | 1 |
| Aviation | 23 |
| Business | 2 |
| Computer networks | 1 |
| Earth sciences | 1 |
| Electronics | 14 |
| Information technology | 3 |
| Librarianship | 1 |
| Navigation | 2 |
| Space | 61 |
| Technology | 1 |
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