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| 61. | spark technique |
| 火花法 |
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| 62. | spark distributor |
| 火花分配器 |
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| 63. | spark quenching |
| 电火花淬火 |
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| 64. | spark intensifier |
| 火花增强器 |
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| 65. | spark suppressor |
| 火花抑制器 |
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| 66. | spark regulation |
| 火花调节器 |
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| 67. | spark telegraphy |
| 火花电报 |
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| 68. | condensed spark |
| 高电容火花 |
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| 69. | discharge spark |
| 放电火花 |
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| 70. | spark photograph |
| 闪光照相 |
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