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| center of notch | |||
| 槽中心: 22 phrases in 8 subjects |
| Construction | 1 |
| Drilling | 1 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Metallurgy | 2 |
| Mining | 1 |
| Technology | 14 |
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