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| 钻镗孔深度 | |||
| 钻探深度 | |||
| 钻孔深度; 孔深【岩】; 镗孔深度 | |||
| boring depth: 5 phrases in 3 subjects |
| Automobiles | 1 |
| Bridge construction | 1 |
| Technology | 3 |
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