收费电动栏杆不落,通常有以下原因:栏杆机电源掉电、电机故障 、线圈故障和( )。 ( A )控制器故障 ( B )车道摄像机故障 ( C )费额显示器故障 ( D )票据打印机故障
A.
I/O控制器故障
B.
车道摄像机故障
C.
费额显示器故障
D.
票据打印机故障
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