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| 71. | friction Brake |
| 摩擦煞车 |
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| 72. | center of friction |
| 摩擦中心 |
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| 73. | mutual friction |
| 互摩擦 |
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| 74. | friction clutch |
| 摩擦离合器 |
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| 75. | minute friction |
| 毛细摩擦 |
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| 76. | bearing friction |
| 轴承摩擦 |
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| 77. | nature of friction |
| 摩擦性质 |
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| 78. | Friction will be neglected. |
| 摩擦忽略不计。 |
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| 79. | virtual friction |
| 表观摩擦 |
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| 80. | cavity friction |
| 声腔摩擦 |
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