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| 引用频率 | |||
| 基准参考频率 | |||
| 参比频率 | |||
| 参考频率 | |||
| 基准频率 | |||
| 参照频率 | |||
| 参考频率800Hz, 1000Hz, 或 1020Hz; 引用次数 | |||
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reference frequency : 24 phrases in 9 subjects |
| Air defense | 2 |
| Aviation | 1 |
| Electricity | 1 |
| Electronics | 6 |
| Hydroelectric power stations | 1 |
| Mathematics | 1 |
| Space | 6 |
| Technology | 3 |
| Telecommunications | 3 |