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| operations and maintenance | |||
| operations and maintenance | |||
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操作与维护 : 27 phrases in 8 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Business | 1 |
| Communications | 1 |
| Earth sciences | 1 |
| Electronics | 18 |
| Technology | 1 |
| Telecommunications | 2 |
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