| |||
| 可变频率控制 | |||
| 变频控制 | |||
| |||
| ★ 变频调速 | |||
| |||
| 可变频率控制 | |||
|
variable frequency control : 4 phrases in 4 subjects |
| Aviation | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Technology | 1 |
| |||
| 可变频率控制 | |||
| 变频控制 | |||
| |||
| ★ 变频调速 | |||
| |||
| 可变频率控制 | |||
|
variable frequency control : 4 phrases in 4 subjects |
| Aviation | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Technology | 1 |