问题
单项选择题
电机车正常运行时，牵引电动机处于电动运行状态；电气制动时处于（）状态。
A.发电运行
B.电动运行
C.串联运行
D.并联运行
答案
参考答案：A
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电机车正常运行时，牵引电动机处于电动运行状态；电气制动时处于（）状态。
A.发电运行
B.电动运行
C.串联运行
D.并联运行
参考答案：A
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