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| 41. | friction ignition |
| 摩擦点火 |
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| 42. | magnetic friction |
| 磁摩擦 |
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| 43. | produce fire by friction |
| 摩擦起火 |
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| 44. | friction member |
| 摩擦构件 |
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| 45. | index of friction |
| 摩擦指数 |
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| 46. | friction damping |
| 摩擦阻尼 |
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| 47. | boundary layer friction |
| 边界层摩擦 |
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| 48. | friction let off |
| 摩擦送经 |
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| 49. | friction compensatio |
| 摩擦补偿 |
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| 50. | friction pressure |
| 摩擦压力 |
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