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| 预告信号; 预告信号机 | |||
| 接近信号机 | |||
| 列车近站信号; 接近信号; 行近信号; 港口信号 | |||
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approach signal : 9 phrases in 5 subjects |
| Communications | 3 |
| Electronics | 1 |
| Rail transport | 1 |
| Space | 1 |
| Technology | 3 |
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