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| frequency modulation by tone | |||
| 音调调频: 49 phrases in 13 subjects |
| Air defense | 3 |
| Automobiles | 1 |
| Aviation | 3 |
| Communications | 1 |
| Construction | 1 |
| Electronics | 13 |
| General | 5 |
| Information technology | 3 |
| Multimedia | 2 |
| Otorhinolaryngology | 1 |
| Space | 2 |
| Technology | 8 |
| Telecommunications | 6 |
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