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单选题
对发电机输出的电源频率的调节，说法正确的是：
A
不可调节
B
通过调整发动机推力来调节发电机的输出频率
C
通过调整输入的励磁电压来调节发电机的输出频率
D
通过调整CSD的输出速度可以有限度的调节发电机的输出频率
答案解析
正确答案：D
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