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| 81. | principle of selection |
| 选择原理 |
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| 82. | principle of evolution |
| 进化原理 |
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| 83. | principle of exclusion |
| 排斥原理 |
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| 84. | principle of virtual displacements |
| 虚位移原理 |
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| 85. | principle of indifference |
| 无差别原理 |
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| 86. | principle of moment |
| 矩原理 |
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| 87. | Principle of Mechanical Designing |
| 机械设计原理 |
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| 88. | principle of stratificaitio |
| 分层原理 |
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| 89. | Principle of Melting |
| 熔炼原理 |
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| 90. | principle of work |
| 工作原理 |
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