在信号机点灯电路中，灯丝继电器只检查点灯灯丝的情况，不检查另外一个灯的情况。
A filament relay only checks the status of the lighting filament in the circuit route of lighting railway signal, not checks the status of another one.
在信号机点灯电路中，灯丝继电器只检查点灯灯丝的情况，不检查另外一个灯的情况。
A filament relay only checks the status of the lighting filament in the circuit route of lighting railway signal, not checks the status of another one.
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