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31. | spark intensifier |
| 火花增强器 |
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32. | spark suppressor |
| 火花抑制器 |
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33. | spark telegraphy |
| 火花电报 |
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34. | spark shadowgraph |
| 电花图 |
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35. | discharge spark |
| 放电火花 |
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36. | condensed spark |
| 高电容火花 |
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37. | spark regulation |
| 火花调节器 |
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38. | spark photograph |
| 闪光照相 |
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39. | spark technique |
| 火花法 |
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40. | micrometer spark |
| 可微调的火花隙 |
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