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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 |
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 |