The magnetic field is provided by electromagnets so arranged that adjacent poles have （）.<br>A:opposite polarity<br>B:the same polarity<br>C:negative polarity<br>D:positive polarity

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

出自：海船船员证

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