切断电源检查信号反馈回路是否接通，电压是否正常。
Cut off power supply check signal the feedback loop is switched on, the voltage is normal or not.
铁路信号电源是保证列车安全正常运行的关键设备。
The railway signal power is the key device to ensure safety and normal performance of the train.
铁路信号电源是保证列车安全正常运行的关键设备。
The railway signal power supply is the key device to ensure the safe and normal operation of the train.
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