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71. | spark hardening |
| 放电硬化 |
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72. | incendive spark |
| 可引起着火的火花 |
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73. | disruptive spark |
| 击穿火花 |
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74. | spark oscillator |
| 火花振荡器 |
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75. | spark chronoscope |
| 电火花计时器 |
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76. | spark formation |
| 火花形成 |
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77. | spark clearance |
| 火花间隙 |
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78. | spark micrometer |
| 火花放电显微计 |
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79. | spark detection |
| 火花探测 |
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80. | spark potential |
| 火花电位 |
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