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| 71. | spark erosion fabrication |
| 电火花腐蚀加工 |
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| 72. | spark arrester netting |
| 火星网 |
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| 73. | spark impact transmitter |
| 冲击火花发报机 |
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| 74. | spark chamber picture |
| 火花室图片 |
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| 75. | spark over test |
| 跳火试验 |
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| 76. | spark ignition engine |
| 火花点火式引擎 |
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| 77. | spark erosion technique |
| 电火花加工技术 |
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| 78. | spark of genius |
| 天才的闪现，天才的火花 |
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| 79. | spark gap width |
| 火花隙宽度 |
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| 80. | spark plug engine |
| 火花塞发火发动机 |
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