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| 21. | a unit measuring force per unit area. |
| 测量单位面积所受的力的单位。 |
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| 22. | auxiliary power unit electronic control unit |
| 辅助动力装置电子控制器 |
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| 23. | arithmetic unit |
| 运算部件,运算器 |
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| 24. | sealed in fuel unit encapsulated fuel unit |
| 密封释热元仟 |
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| 25. | unification unit |
| 合一部件 |
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| 26. | reserve unit |
| 后备部队 |
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| 27. | biostratigraphic unit |
| 生物地层单位 |
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| 28. | Angstrom unit |
| 埃(A) |
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| 29. | unit budget |
| 单位预算 |
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| 30. | unit connection |
| 单元连接 |
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