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| 51. | low-level wind shear |
| 低空风切变 |
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| 52. | low level waste disposal |
| 低放射性废物处置 |
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| 53. | low-level directional sign |
| 接近地面的方向指示牌；低位置方向指示牌 |
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| 54. | A low-level job. |
| 低级工作 |
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| 55. | low-level input voltage |
| 低电平输入电压 |
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| 56. | low-level lighting syste |
| 低照度照明系统(夜间通道 |
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| 57. | low-level luminance processing |
| 低电平亮度处理 |
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| 58. | low level liquid wastes |
| 低放液态废物 |
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| 59. | low-level output voltage |
| 低电平输出电压 |
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| 60. | high-low level control |
| 高低液位控制 |
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