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| variable time | |||
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可变时间 : 13 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Business | 2 |
| Dentistry | 1 |
| Electronics | 2 |
| Information technology | 1 |
| Project management | 1 |
| Space | 2 |
| Technology | 1 |
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