【单选题】【消耗次数：1】
直流发电机中会不会产生电磁转矩？
①
会
②
不会
③
两者都是
④
都不是
参考答案：
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关于他励直流发电机功率关系说法正确的是：（）。
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<imgwidth="235"height="60"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD12038.png">
②
<imgwidth="215"height="60"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD12148.png">
③
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关于他励直流发电机功率关系说法正确的是：（）。
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一台他励直流发电机的输入功率等于（）
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