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| 41. | intergrating heat meter |
| 积算热量计 |
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| 42. | primitive operator |
| 原始算符 |
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| 43. | principal design sections |
| 制算截面 |
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| 44. | hierarchy of operator |
| 算符层次 |
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| 45. | To count......on the fingers |
| 屈指算之 |
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| 46. | inversion formula |
| 反算公式 |
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| 47. | moment operator |
| 力矩算符 |
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| 48. | hexagon nomogram |
| 六角算图 |
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| 49. | metallurgical accountability |
| 冶金衡算 |
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| 50. | group of unitary operators |
| 酉算子群 |
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