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| 41. | ratio reinforcement |
| 比率强化 |
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| 42. | ratio indicator |
| 比率指示器 |
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| 43. | ratio of cations |
| 阳离子比率 |
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| 44. | affective ratio |
| 情感比率 |
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| 45. | Total Dependency Ratio |
| 瞻养比率 |
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| 46. | input-output ratio |
| 投入产出比率 |
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| 47. | enrolment ratio |
| 入学比率 |
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| 48. | amplitude ratio |
| 振幅比率 |
|
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| 49. | propagation ratio |
| 传播比率 |
|
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| 50. | active ingredient rate |
| 有效成分比率 |
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