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| 51. | fusible safety plug |
| 可熔安全塞 |
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| 52. | multi-plug connector |
| 多插头联结器 |
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| 53. | miscible plug process |
| 混相段塞驱动 |
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| 54. | liner wiper plug |
| 衬管刮塞 |
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| 55. | multiple step plug |
| 多级阀芯 |
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| 56. | pressure plug asphalt |
| 隔层充填用沥青 |
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| 57. | multiple-pin plug |
| 多脚插头 |
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| 58. | ground service plug |
| 地面电源插头 |
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| 59. | leading spark plug |
| 前置火花塞 |
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| 60. | control valve plug |
| 控制阀塞 |
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