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当前学科：电气工程师供配电
题目：
单选题
他励电动机的人为机械特性在额定电压额定磁通时与它的固有机械特性比（）
A
转速降降低，特性变软。
B
转速降降低，特性变硬。
C
转速降增大，特性变软。
D
转速降增大，特性变硬。
答案：
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