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| 大口径孔孔径＞0.6m | |||
| 大直径钻孔; 大直径圆孔 | |||
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large -diameter hole : 4 phrases in 3 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| Oil / petroleum | 1 |
| Technology | 2 |
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