 |
| |||
| switching; switching off; turning off | |||
| operation of switches; throwing-over the points | |||
| maniobra de las agujas: 3 短语, 1 学科 |
| 通讯 | 3 |
|
| |||
| switching; switching off; turning off | |||
| operation of switches; throwing-over the points | |||
| maniobra de las agujas: 3 短语, 1 学科 |
| 通讯 | 3 |