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| 冲击式钻杆 | |||
| 重钻杆; 冲击钻杆 | |||
| 加重杆; 撞杆 | |||
| 压载杆; 冲击式钻杆 | |||
| 沉降片座 | |||
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sinker bar : 8 phrases in 2 subjects |
| Oil / petroleum | 5 |
| Technology | 3 |
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