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直流电动机反接制动是在电动机运行时将电动机（）接入反向电源。
A、电枢绕组
B、励磁绕组
C、电磁转矩
D、以上都不对

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The Confucius Institute, as a platform of boosting educational and cultural exchanges, has greatly enhanced mutual understanding and friendship between China and other countries.
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