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| 滚子滚道 | |||
| 辊式输送机 | |||
| 滚道; 辊式输送器; 辊道定轮轨道 | |||
| 进给的滚柱系 | |||
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roller path : 9 phrases in 3 subjects |
| Automobiles | 1 |
| Metallurgy | 3 |
| Technology | 5 |
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