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51. | semidiameter correction |
| 半径校正 |
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52. | hydraulic radius |
| 水力学半径 |
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53. | radius of a circle |
| 圆周半径 |
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54. | characteristic radius |
| 特征半径 |
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55. | radius of operation |
| 作用半径 |
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56. | electron radius |
| 电子半径 |
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57. | radius of protection |
| 保护半径 |
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58. | operational radius of actio |
| 作战半径 |
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59. | radius of sphericity |
| 球体半径 |
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60. | schwarzschild radius |
| 史瓦西半径 |
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