 |
| |||
| sound carrier | |||
| voice carrier | |||
| voice frequency carrier | |||
| audio carrier; voice-frequency carrier | |||
| |||
| sound carrier; voice carrier | |||
|
音频 载波 : 10 phrases in 8 subjects |
| Air defense | 1 |
| Electronics | 2 |
| General | 1 |
| Information technology | 1 |
| Project management | 1 |
| Space | 1 |
| Technology | 2 |
| Telecommunications | 1 |
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