| |||
| 低频发生器 | |||
| 低频发电机 | |||
| 低频发射机 | |||
| |||
| 低频发电机 | |||
|
low- frequency generator : 6 phrases in 3 subjects |
| Electric machinery | 1 |
| Electronics | 2 |
| Technology | 3 |
| |||
| 低频发生器 | |||
| 低频发电机 | |||
| 低频发射机 | |||
| |||
| 低频发电机 | |||
|
low- frequency generator : 6 phrases in 3 subjects |
| Electric machinery | 1 |
| Electronics | 2 |
| Technology | 3 |