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| maintenance and operating | |||
| maintenance and operation | |||
| 维修和操作: 28 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 12 |
| Business | 2 |
| Economy | 5 |
| Electronics | 1 |
| Mechanics | 1 |
| Project management | 2 |
| Shipbuilding | 1 |
| Technology | 2 |
| Telecommunications | 1 |
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