 |
| |||
| 连续调频 | |||
|
continuous frequency : 40 phrases in 12 subjects |
| Air defense | 5 |
| Automobiles | 2 |
| Earth sciences | 4 |
| Electricity | 1 |
| Electronics | 11 |
| Geophysics | 4 |
| Information technology | 1 |
| Otorhinolaryngology | 4 |
| Space | 3 |
| Statistics | 3 |
| Technology | 1 |
| Telecommunications | 1 |