一台他励直流发电机的输入功率<imgwidth="40"height="59"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD39625.png">等于（）

【单选题】【消耗次数：1】

① <imgwidth="148"height="60"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD39741.png">

② <imgwidth="157"height="99"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD39862.png">

③ <imgwidth="103"height="60"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD39983.png">

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