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61. | hierarchy of operator |
| 算符层次 |
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62. | To count......on the fingers |
| 屈指算之 |
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63. | moment operator |
| 力矩算符 |
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64. | imputed rate of interest |
| 设算利率 |
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65. | metallurgical accountability |
| 冶金衡算 |
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66. | hexagon nomogram |
| 六角算图 |
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67. | inversion formula |
| 反算公式 |
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68. | group of unitary operators |
| 酉算子群 |
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69. | intergrating heat meter |
| 积算热量计 |
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70. | reduction to ellipsoid |
| 椭球面归算 |
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