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| 51. | harmonic pencil of lines |
| 调和线束 |
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| 52. | clear blending value |
| 净调和值|不加四乙铅的调和辛烷值 |
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| 53. | weighted harmonic mean |
| 加权调和平均 |
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| 54. | classical harmonic analysis |
| 经典调和分析 |
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| 55. | weighted harmonic average price |
| 加权调和平均价格 |
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| 56. | harmonic consituent |
| 调和分潮 |
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| 57. | harmonic(al) mean |
| 调和中项 |
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| 58. | harmonic range of points |
| 调和点列 |
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| 59. | harmonic conjugate ray |
| 调和共轭射线 |
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| 60. | minimal harmonic |
| 极小调和的 |
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