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| |||
| 钳头扣在钻杆上的部位 | |||
| 大钳搭咬部位; 扣钳部位; 钳位 | |||
| 大钳安置高度 | |||
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tong space : 5 phrases in 3 subjects |
| Drilling | 1 |
| Oil / petroleum | 2 |
| Technology | 2 |
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