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| 试验性钻孔; 探〔试〕坑 | |||
| 样洞; 探孔; 探坑; 试钻孔; 试验性钻孔; 试验孔; 试孔 | |||
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| 试验孔 | |||
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trial hole : 3 phrases in 3 subjects |
| Electronics | 1 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
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