| |||
| ★ 电码轨道电路 | |||
| 编码轨道电路 | |||
|
coded track-circuit : 9 phrases in 4 subjects |
| Communications | 3 |
| Electronics | 1 |
| Rail transport | 1 |
| Technology | 4 |
| |||
| ★ 电码轨道电路 | |||
| 编码轨道电路 | |||
|
coded track-circuit : 9 phrases in 4 subjects |
| Communications | 3 |
| Electronics | 1 |
| Rail transport | 1 |
| Technology | 4 |