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| 超前巷道参见 pilot heading | |||
| 超前导坑 | |||
| 超前开拓道路; 前置的开拓道路; 超前平巷; 超前工作面; 前置的开挖道路 | |||
| advance heading: 4 phrases in 1 subject |
| Technology | 4 |
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