| |||
private exchange | |||
private branch exchange |
专用小 交换 机 : 31 phrases in 10 subjects |
Business | 1 |
Electronics | 19 |
General | 2 |
Hydroelectric power stations | 1 |
Information technology | 1 |
Multimedia | 3 |
Nuclear and fusion power | 1 |
Rail transport | 1 |
Technology | 1 |
United Nations | 1 |