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| service hour | |||
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使 用时数 : 14 phrases in 9 subjects |
| Aviation | 2 |
| Business | 2 |
| Drilling | 3 |
| Economy | 1 |
| Project management | 1 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 2 |
| Telecommunications | 1 |
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