 |
| |||
| 变〔换〕频; 频率变换 | |||
| |||
| 频率变换; 变频 | |||
| 频率变化 | |||
|
frequency-change : 22 phrases in 12 subjects |
| Air defense | 2 |
| Animal husbandry | 1 |
| Automobiles | 1 |
| Aviation | 3 |
| Electric machinery | 2 |
| Genetics | 2 |
| Information technology | 1 |
| Mechanic engineering | 1 |
| Metallurgy | 2 |
| Military | 1 |
| Technology | 4 |
| Telecommunications | 2 |