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| 停电用转换继电器 | |||
| 电源变换继电器 | |||
| 停电用电源转换继电器; 故障继电器; 电源切断继电器 | |||
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power-off relay : 2 phrases in 2 subjects |
| Power system protection | 1 |
| Technology | 1 |
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