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21. | soild lubrication |
| 固体润滑 |
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22. | molecular theory of solids |
| 固体分子论 |
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23. | solid state cathode |
| 固体阴极 |
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24. | separated solid |
| 分隔固体 |
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25. | Solid State Theory |
| 固体理论 |
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26. | solid propellant rocket engine |
| 固体火箭发动机 |
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27. | solid dielectric |
| 固体电介质 |
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28. | discharged solids |
| 卸料固体 |
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29. | solid extraction |
| 固体提取 |
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30. | solid state camera |
| 固体摄像机 |
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