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维护中心 : 50 phrases in 12 subjects |
| Air defense | 1 |
| Automobiles | 3 |
| Aviation | 5 |
| Communications | 1 |
| Computer networks | 1 |
| Electronics | 19 |
| Information technology | 3 |
| Rail transport | 1 |
| Space | 3 |
| Technology | 2 |
| Telecommunications | 10 |
| United States | 1 |
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