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| 41. | "Police Constable, Class II" |
| 二级警员 |
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| 42. | two stage reduction gear |
| 二级减速器 |
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| 43. | two-level allocation |
| 二级分配 |
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| 44. | second-order radiation |
| 二级辐射 |
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| 45. | two-level logic |
| 二级逻辑 |
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| 46. | second level service |
| 二级保养 |
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| 47. | two-stage superheater |
| 二级过热器 |
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| 48. | second-order calculation |
| 二级近似计算 |
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| 49. | diode image tube |
| 二级摄像管 |
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| 50. | secondary electron spectrum |
| 二级电子光谱 |
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