| |||
| optional relay | |||
| supplementary relay; additional relay (ssn) | |||
| |||
| additional relays (ssn) | |||
|
дополнительное реле : 2 短语, 2 学科 |
| 技术 | 1 |
| 铁路术语 | 1 |
| |||
| optional relay | |||
| supplementary relay; additional relay (ssn) | |||
| |||
| additional relays (ssn) | |||
|
дополнительное реле : 2 短语, 2 学科 |
| 技术 | 1 |
| 铁路术语 | 1 |