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top of cement
| plug
| top of cement | |
| dril. | 水泥 顶部; 水泥顶面 |
| plug | |
| hydroel.st. | 栓 |
| manag. | 堵 |
| roll. | 芯棒; 芯塞; 顶头; 套 |
| |||
| 水泥环顶部; 水泥顶面 | |||
| 水泥返高 | |||
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top of cement plug : 3 phrases in 1 subject |
| Drilling | 3 |
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