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| maintenance and operations | |||
| maintenance and operation | |||
| 维护和操作: 32 phrases in 10 subjects |
| Aviation | 13 |
| Communications | 1 |
| Economy | 1 |
| General | 1 |
| Information technology | 2 |
| Military | 1 |
| Nautical | 1 |
| Space | 4 |
| Technology | 2 |
| Telecommunications | 6 |
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