空间电角度<imgwidth="32"height="30"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD29245.png">与机械角度β之间的关系为（）

【单选题】【消耗次数：1】

① <imgwidth="87"height="43"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD29371.png">

② <imgwidth="134"height="43"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD29492.png">

③ <imgwidth="134"height="43"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD29611.png">

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