 |
| |||
| automatic switching system; machine switching system | |||
| dial exchange | |||
| automatic exchange; dial central office | |||
|
central automatica : 16 短语, 3 学科 |
| 信息技术 | 1 |
| 建造 | 2 |
| 通讯 | 13 |
|
| |||
| automatic switching system; machine switching system | |||
| dial exchange | |||
| automatic exchange; dial central office | |||
|
central automatica : 16 短语, 3 学科 |
| 信息技术 | 1 |
| 建造 | 2 |
| 通讯 | 13 |