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| characteristic time | |||
| 特 征 时间: 16 phrases in 11 subjects |
| Athletics | 1 |
| Aviation | 1 |
| Business | 2 |
| Communications | 1 |
| Desert science | 2 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Oil / petroleum | 1 |
| Space | 3 |
| Technology | 2 |
| Telecommunications | 1 |
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