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51. | frictional theory |
| 摩擦理论 |
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52. | friction roller |
| 摩擦滚柱 |
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53. | friction separator |
| 摩擦分离器 |
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54. | fatigue under scrubbing |
| 摩擦疲劳 |
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55. | friction spun yarn |
| 摩擦纺纱 |
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56. | frictional power |
| 摩擦功率 |
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57. | frictional contact |
| 摩擦接触 |
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58. | frictional torque |
| 摩擦扭矩 |
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59. | frictional heat source |
| 摩擦热源 |
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60. | flowage friction |
| 流动摩擦 |
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