multifrequency code
| signalling
| multifrequency code | |
| geophys. | 多频码 |
| signalling | |
| hydroel.st. | 信号设备; 发信号 |
| met. | 信号; 通信 |
| space | 发码; 信号传输; 信令 |
| tech. | 直流振铃 |
| |||
| 多频码 | |||
| 多频编码信令; 多频编码 | |||
|
multifrequency code : 9 phrases in 4 subjects |
| Electronics | 3 |
| Space | 1 |
| Technology | 2 |
| Telecommunications | 3 |