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| 燃料元件装卸抓头垂直孔核 | |||
| 垂直井 | |||
| 竖孔; 垂直钻孔; 垂直浆缝 | |||
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vertical hole : 6 phrases in 3 subjects |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 3 |
| Technology | 2 |
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