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| 31. | spark potential |
| 火花电位 |
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| 32. | spark clearance |
| 火花间隙 |
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| 33. | spark detection |
| 火花探测 |
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| 34. | spark protractor |
| 火花时间测定器 |
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| 35. | spark formation |
| 火花形成 |
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| 36. | spark oscillator |
| 火花振荡器 |
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| 37. | spark hardening |
| 放电硬化 |
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| 38. | spark preventer |
| 火花防止器 |
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| 39. | spark micrometer |
| 火花放电显微计 |
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| 40. | spark resistance |
| 火花电阻 |
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