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spring roller
| centralizer
| spring roller | |
| tech. | 弹簧滚柱; 弹簧辊 |
| centralizer | |
| dril. | 扶正器; 扶正器 |
| eng.geol. | 对中器; 定心器 |
| space | 定中心夹具 |
| tech. | 定中心装置; 导中器; 换位矩阵 |
| |||
| 轴承的弹簧滚柱; 弹簧辊 | |||
| spring roller: 6 phrases in 3 subjects |
| Geophysics | 1 |
| Polygraphy | 1 |
| Technology | 4 |
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