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71. | magneto spark advance |
| 磁电火花提前 |
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72. | coaxial spark-gap |
| 共轴火花隙 |
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73. | acoustic spark chamber |
| 声学火花室 |
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74. | leading spark plug |
| 前置火花塞 |
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75. | filmless spark chamber |
| 无底片火花室 |
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76. | magnetic spark spectrometer |
| 磁火花谱仪 |
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77. | quenched spark transmitter |
| 熄灭式火花发报机 |
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78. | protective spark gap |
| 保护火花隙; 安全火花隙 |
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79. | modifier spark advance |
| 发火提早装置 |
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80. | induction spark coil |
| 电火花感应线圈 |
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