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| 轴向直廓螺旋面; 蜗杆轴向截面内具有直线齿廓的螺旋面 | |||
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screw helicoid : 5 phrases in 4 subjects |
| Agriculture | 1 |
| Animal husbandry | 1 |
| Chemistry | 1 |
| Shipbuilding | 2 |
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