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【单选题】
基本频率是变频器对电动机进行恒功率控制和恒转矩控制的分界线,应按( )设定。
A.
(A)电动机额定电压时允许的最小频率
B.
(B)上限工作频率
C.
(C)电动机的允许最高频率
D.
(D)电动机的额定电压时允许的最高频率
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