问题详情

Paragraph 4__________ 查看材料
A.The main components of the maglev train system
B.High-speed maglev due to zero friction
C.The working principle of the maglev train
D.Differences between polarity and magnetic field
E.Comparison of maglev trains with traditional ones
F.Maglev with a powerful motor请帮忙给出正确答案和分析，谢谢！