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| 维护,操作,管理 | |||
| maintenance, operation and administration: 21 phrases in 8 subjects |
| Air defense | 1 |
| Aviation | 4 |
| Communications | 2 |
| Computer networks | 1 |
| Electronics | 7 |
| Information technology | 1 |
| Space | 1 |
| Telecommunications | 4 |
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