 |
| |||
| 固井注水泥上胶塞 | |||
| 封闭塞 | |||
| 封闭栓 | |||
| 密封塞; 合箱柱塞; 关闭塞 | |||
|
closing plug : 4 phrases in 3 subjects |
| Drilling | 1 |
| Oil / petroleum | 1 |
| Technology | 2 |
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