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81. | data transmission circuit |
| 数据传输线路 |
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82. | a power circuit |
| 电源线路 |
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83. | special type of track |
| 特种线路 |
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84. | ancillary circuit |
| 辅助线路 |
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85. | strength failure of track |
| 线路松动 |
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86. | radio-frequency line |
| 射频线路 |
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87. | ignition circuit |
| 点火线路 |
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88. | day and night line |
| 昼夜线路 |
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89. | high frequency line |
| 高频线路 |
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90. | on-call circuit |
| 应需线路 |
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