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21. | concentration obstacle |
| 浓度障碍 |
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22. | concentration diffusion |
| 浓差扩散 |
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23. | concentration equation |
| 浓度方程 |
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24. | concentration test |
| 浓缩试验 |
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25. | concentration gradient |
| 浓度差 |
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26. | concentration line |
| 总线;公共线 |
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27. | concentration index |
| 集中指数 |
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28. | concentration quotient |
| 浓度商 |
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29. | concentration level |
| 浓度级 |
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30. | concentration triangle |
| 浓度三角形 |
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