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31. | frictional depth |
| 摩擦深度 |
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32. | friction mechanism |
| 摩擦机构 |
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33. | friction separation |
| 摩擦选 |
|
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34. | frictional testing machine |
| 摩擦试验机 |
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35. | friction spring |
| 摩擦弹簧 |
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36. | frictional belt |
| 摩擦区 |
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37. | friction winding |
| 摩擦提升 |
|
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38. | frictional restriction |
| 摩擦限制 |
|
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39. | frictional behavior |
| 摩擦特性 |
|
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40. | cone of friction |
| 摩擦圆锥 |
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