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| 摩擦轮滚子; 单向离合器滚子 | |||
| 摩擦滚柱; 摩擦辊 | |||
| 摩擦滚筒 | |||
| 导缆口滚柱 | |||
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friction roller : 4 phrases in 3 subjects |
| Drilling | 1 |
| Oil / petroleum | 1 |
| Technology | 2 |
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