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| 11. | spark preventer |
| 火花防止器 |
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| 12. | spark detection |
| 火花探测 |
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| 13. | spark formation |
| 火花形成 |
|
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| 14. | spark resistance |
| 火花电阻 |
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| 15. | spark hardening |
| 放电硬化 |
|
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| 16. | spark potential |
| 火花电位 |
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| 17. | spark micrometer |
| 火花放电显微计 |
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| 18. | spark protractor |
| 火花时间测定器 |
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| 19. | spark oscillator |
| 火花振荡器 |
|
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| 20. | spark transmitter |
| 电花发送机 |
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