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| 掌子面 | |||
| 采煤工作面进行采煤作业的场所 | |||
| 煤层截面; 采煤工作面 | |||
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coal face survey : 2 phrases in 2 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| Technology | 1 |
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