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| 31. | contrast reduction factor |
| 对比度降低因数 |
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| 32. | automatic contrast control |
| 对比度自动控制 |
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| 33. | threshold contrast |
| 临阈对比度 |
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| 34. | Subject contrast |
| 被检体对比度 |
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| 35. | Radiographic contrast |
| 射线底片对比度 |
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| 36. | contrast control device |
| 对比度第装置 |
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| 37. | full sensitivity contrast |
| 全灵敏度对比度 |
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| 38. | contrast dynamic range |
| 对比度动态范围 |
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| 39. | master contrast controller |
| 主对比度控制器 |
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| 40. | contrast potentiometer |
| 对比度调整电位计 |
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