| |||
| 频率指示仪 | |||
| 频率指示器; 示频器 | |||
| 频率计; 频率表; 示频率; 单频指示器 | |||
| |||
| 示频器 | |||
|
frequency indicator : 25 phrases in 5 subjects |
| Air defense | 5 |
| Electronics | 8 |
| Geophysics | 2 |
| Radio | 2 |
| Technology | 8 |
| |||
| 频率指示仪 | |||
| 频率指示器; 示频器 | |||
| 频率计; 频率表; 示频率; 单频指示器 | |||
| |||
| 示频器 | |||
|
frequency indicator : 25 phrases in 5 subjects |
| Air defense | 5 |
| Electronics | 8 |
| Geophysics | 2 |
| Radio | 2 |
| Technology | 8 |