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单选题
应急舵的基本工作原理是:()
A
用控制开关直接控制继电器或其它相应装置来启动舵机工作
B
利用惠斯顿电桥的偏差信号经放大来驱动继电器的断通
C
采用舵角反馈发送装置
D
转动舵轮来控制舵机使舵转出相应的舵角
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