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| 气门研磨工具 | |||
| 磨具 | |||
| 磨削工具; 粉磨工具 | |||
| grinding tool: 30 phrases in 5 subjects |
| Automobiles | 6 |
| Aviation | 2 |
| Electric machinery | 1 |
| Metallurgy | 3 |
| Technology | 18 |
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