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【单选题】
变速变频交流电源系统适用于装有涡轮螺旋桨发动机飞机或直升机的原因是
A.
发电机之间不用并联供电
B.
统结构简单,重量轻,可靠性高,维护方便,效率高
C.
发电机输出电压的频率变化范围也大
D.
涡轮螺旋桨发动机的转速变化范围很小,这样发电机输出电压的频率变化范围也就很小
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