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| 41. | three-electrode spark |
| 三电极火花 |
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| 42. | magnetic spark blow-out |
| 磁铁灭火花;磁铁灭火花器 |
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| 43. | spark at make contact |
| 闭合火花 |
|
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| 44. | spark impact transmitter |
| 冲击火花发报机 |
|
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| 45. | coaxial spark-gap |
| 共轴火花隙 |
|
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| 46. | controllable spark gap |
| 可控火花隙 |
|
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| 47. | magneto spark advance |
| 磁电火花提前 |
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| 48. | spark gap width |
| 火花隙宽度 |
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| 49. | master spark gap |
| 主控火花隙 |
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| 50. | spark-gap adjustment |
| 火花隙调整 |
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