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| high-frequency stage | |||
| high frequency stage | |||
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高频级 : 21 phrases in 8 subjects |
| Air defense | 1 |
| Electronics | 11 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Information technology | 1 |
| Multimedia | 1 |
| Space | 1 |
| Technology | 4 |
| United States | 1 |
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