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| maintenance schedule | |||
| maintenance plan | |||
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维护计划 : 37 phrases in 10 subjects |
| Air defense | 1 |
| Automobiles | 2 |
| Aviation | 21 |
| Economy | 1 |
| Electronics | 3 |
| Information technology | 2 |
| Project management | 1 |
| Space | 3 |
| Technology | 1 |
| Telecommunications | 2 |
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