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| 双线自动闭塞 | |||
| 复线自动闭塞系统; 双线自动闭塞系统 | |||
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| 双线自动闭塞 | |||
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double- track automatic block system : 4 phrases in 3 subjects |
| Communications | 2 |
| Rail transport | 1 |
| Technology | 1 |
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