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| 21. | differential of arc |
| 弧微分 |
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| 22. | gear with curved teeth |
| 弧齿轮 |
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| 23. | arc length |
| 弧长 |
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| 24. | arc of rotation |
| 转动弧 |
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| 25. | cambered surface |
| 弧面 |
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| 26. | arc welding machine |
| 弧焊机 |
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| 27. | restriction arc |
| 限制弧 |
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| 28. | arc of compression |
| 压缩弧 |
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| 29. | arc triangulation |
| 弧三角测量 |
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| 30. | arcwise connectedness |
| 弧连通性 |
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