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| 21. | partial penetration |
| 打开程度不完善 |
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| 22. | penetration convection |
| 穿透对流 |
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| 23. | penetration dyeing |
| 渗透染色 |
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| 24. | economic penetration |
| 经济渗透;经济渗透 |
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| 25. | penetration factor |
| 穿透因子|穿透力 |
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| 26. | penetration test |
| 渗透试验 |
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| 27. | penetration pen |
| 进尺笔 |
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| 28. | root penetration |
| 根部熔深 |
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| 29. | penetration speed |
| 钻机穿进速度 |
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| 30. | anion penetration |
| 阴离子渗入 |
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