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| 井壁与钻具之间的间隙 | |||
| 孔壁间隙; 孔壁与钻具之间的间隙; 井壁与钻具之间的间隙 | |||
| wall clearance: 3 phrases in 3 subjects |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
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