为削弱谐波磁势中五次和七次谐波磁势的幅值，交流电机双层绕组的线圈节距一般为( )左右。_电机学_远程教育查题网

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题目：为削弱谐波磁势中五次和七次谐波磁势的幅值，交流电机双层绕组的线圈节距一般为( )左右。
- A. 5/6极距
- B. 6/7极距
- C. 4/5极距
- D. 一个极距
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