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| frequency variation rate | |||
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频率 变化 率 : 12 phrases in 9 subjects |
| Air defense | 1 |
| Communications | 1 |
| Electric machinery | 1 |
| Electronics | 3 |
| General | 1 |
| Genetics | 2 |
| Nautical | 1 |
| Steel production | 1 |
| Technology | 1 |
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