 |
| |||
| open-circuit signaling; open-circuit signalling | |||
| direct current signaling; direct current signalling; DC signaling; DC signalling | |||
|
likstromssignalering : 2 短语, 1 学科 |
| 通讯 | 2 |
|
| |||
| open-circuit signaling; open-circuit signalling | |||
| direct current signaling; direct current signalling; DC signaling; DC signalling | |||
|
likstromssignalering : 2 短语, 1 学科 |
| 通讯 | 2 |