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【单选题】
他励直流电动机的负载转矩和主磁通保持不变，降低电枢电压稳定运行时，则：（） ①转速增大 ②转速减小 ③电枢电流增大 ④电枢电流减小 ⑤电枢电流不变
A.
①③
B.
②③
C.
①⑤
D.
②⑤
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