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approach locking
| track circuit
| approach locking | |
| commun. railw. | 接近锁闭 |
| el. | 接近闭锁 |
| railw. | 接近锁闭 |
| track circuit | |
| commun. railw. | 轨道电路 |
| el. | 示踪电路; 轨道回路; 跟踪电路 |
| |||
| 接近锁闭 | |||
| 接近闭锁【铁路】 | |||
| 接近锁闭完全锁闭 | |||
| 进场锁定; 接近锁定; 接近锁闭完全锁闭铁 | |||
| approach locking: 12 phrases in 4 subjects |
| Communications | 2 |
| Hydroelectric power stations | 2 |
| Shipbuilding | 2 |
| Technology | 6 |
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