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| 凹辊环 | |||
| 锁口钻孔 | |||
| collar hole: 17 phrases in 6 subjects |
| Drilling | 3 |
| Earth sciences | 1 |
| Electric machinery | 3 |
| Explosives and Explosive Ordnance Disposal | 4 |
| Oil / petroleum | 1 |
| Technology | 5 |
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