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| factory-set bit | |||
| bort-set bit; bortz-set bit | |||
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镶金刚石钻 头 : 44 phrases in 7 subjects |
| Drilling | 20 |
| General | 2 |
| Mechanics | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 5 |
| Shipbuilding | 1 |
| Technology | 13 |
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