 |
| |||
| FM signal; frequency hopping signal | |||
| frequency-modulated signal | |||
| frequency modulated signal | |||
| 调频信 号: 19 phrases in 8 subjects |
| Air defense | 6 |
| Aviation | 1 |
| Computer networks | 1 |
| Construction | 1 |
| Electronics | 3 |
| Multimedia | 1 |
| Space | 2 |
| Technology | 4 |
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