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【单选题】
有些飞机使用一种利用振动频率变化来探测结冰情况的电子式结冰探测器,其工 作原理是让探头以设定频率振动,当探头结冰后A.
其振动频率减小到低限时，微处理器将驾驶舱中的结冰信号灯接通
B.
其振动频率上升到，微处理器将驾驶舱中的结冰信号灯接通
C.
其振动频率减小到原频率的一半时，通过驾驶杆振动发出结冰信号
D.
其振动频率上升到原频率的一倍时，通过驾驶杆振动发出结冰信号
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