The magnetic field is provided by electr
2024-03-11 8次 海船船员 反馈错误 加入收藏 正确率 : 100%
题目内容:
[单选题]The magnetic field is provided by electromagnets so arranged that adjacent poles have ___.
A.opposite polarity
B.the same polarity
C.negative polarity
D.positive polarity
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