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| frequency switch | |||
| frequency transformation | |||
| frequency conversion | |||
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| frequency-conversion | |||
| 频率转 换: 50 phrases in 13 subjects |
| Air defense | 3 |
| Automobiles | 1 |
| Aviation | 3 |
| Computer networks | 1 |
| Earth sciences | 1 |
| Electronics | 26 |
| Geophysics | 1 |
| Information technology | 3 |
| Mathematics | 1 |
| Metallurgy | 1 |
| Space | 5 |
| Technology | 3 |
| Telecommunications | 1 |
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