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| variable frequency | |||
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可变频率 : 30 phrases in 11 subjects |
| Air defense | 3 |
| Aviation | 1 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Electronics | 15 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Genetics | 1 |
| Multimedia | 1 |
| Space | 1 |
| Technology | 4 |
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