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| center hole | |||
| center drilling hole; center drilling borehole; centre drilling hole; centre drilling borehole | |||
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| centre-drilling | |||
| 中心钻孔: 17 phrases in 8 subjects |
| Automobiles | 4 |
| Compressors | 1 |
| General | 1 |
| Measuring instruments | 1 |
| Mechanic engineering | 1 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 7 |
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