| |||
| 频率/时间调制 | |||
| |||
| 频率时间调制 | |||
|
frequency/time modulation : 6 phrases in 4 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Electronics | 3 |
| Oil / petroleum | 1 |
| |||
| 频率/时间调制 | |||
| |||
| 频率时间调制 | |||
|
frequency/time modulation : 6 phrases in 4 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Electronics | 3 |
| Oil / petroleum | 1 |