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21. | semidiameter correction |
| 半径校正 |
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22. | hydraulic radius |
| 水力学半径 |
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23. | radius of a circle |
| 圆周半径 |
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24. | characteristic radius |
| 特征半径 |
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25. | radius of operation |
| 作用半径 |
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26. | electron radius |
| 电子半径 |
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27. | radius of protection |
| 保护半径 |
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28. | operational radius of actio |
| 作战半径 |
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29. | radius of sphericity |
| 球体半径 |
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30. | schwarzschild radius |
| 史瓦西半径 |
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