 |
| |||
| 自动交换控制 | |||
| 道岔自动控制 | |||
|
automatic switching control : 4 phrases in 4 subjects |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Technology | 1 |
|
| |||
| 自动交换控制 | |||
| 道岔自动控制 | |||
|
automatic switching control : 4 phrases in 4 subjects |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Technology | 1 |