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| 51. | cartographic hierarchy |
| 制图分级 |
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| 52. | fractional decomposition |
| 分级分解 |
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| 53. | fractional extractio |
| 分级萃取 |
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| 54. | hierarchical file |
| 分级文件 |
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| 55. | fire resistance grading |
| 耐火性分级 |
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| 56. | investment rating |
| 投资分级 |
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| 57. | stepped cooling |
| 分级冷却 |
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| 58. | cascade protection |
| 分级保护 |
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| 59. | Sorting (grading/Classification) |
| 分级，分类 |
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| 60. | hierarchy control system |
| 分级控制系统 |
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