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| 表面〔正面〕淬火〔渗碳，硬化〕; 镀硬质合金材料; 表面焊〔镀，喷〕一层硬金属材料; 坚硬面层; 硬质焊敷〔镀敷〕层 | |||
| 表面硬质敷焊的; 镶硬质合金的 | |||
| 表面淬火; 表面堆焊硬合金; 表面耐磨堆焊; 表面硬化 | |||
| hardfacing: 5 phrases in 2 subjects |
| Drilling | 2 |
| Oil / petroleum | 3 |
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