题目内容

A . 大门开关状态
B . 器件电流
C . 直流电压
D . 磁头信号

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A . 20%～+20%
B . 15%～+15%
C . 10%～+15%
D . 20%～+15%

A . 50～60Hz
B . 50～70Hz
C . 50～80Hz
D . 50～90Hz

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