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| 41. | RBE =relative biological effectiveness |
| 相对生物效能 |
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| 42. | The usefulness is great |
| 用处甚大 |
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| 43. | line in economic usefulness |
| 经济效用减低;经济效用减低 |
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| 44. | cost versus effectiveness analysis |
| 费用效能分析 |
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| 45. | value or advantage;usefulness |
| 价值;益处;效用 |
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| 46. | effectiveness test of fire fighting installation |
| 消防效能试验装置 |
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| 47. | The Usefulness of the Stage |
| 戏剧文学的效应 |
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| 48. | relative biological effectiveness |
| 相对生物学效能 |
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| 49. | He has outlived his usefulness. |
| 他已老而无用了。 |
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| 50. | physiological effective energy |
| 生理有效能 |
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