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| 31. | preheating section |
| 预热段 |
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| 32. | preheat fluorescent lamp |
| 预热荧光灯 |
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| 33. | preheating flame |
| 预热火焰 |
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| 34. | local preheating |
| 局部预热 |
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| 35. | grain preheating |
| 粮食预热 |
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| 36. | preheating circuit |
| 预热回路 |
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| 37. | preheat current |
| 预热电流 |
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| 38. | preheating tunnel |
| 预热隧道 |
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| 39. | preheated electric arc welding |
| 预热电弧焊接 |
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| 40. | thermal pretreatment |
| 预热处理 |
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