By using simple experimental apparatus, this problem investigates the nature of the magnetic braking force quantitatively.
该题利用简单的实验装置定量研究磁刹车力与相关参量的关系。
Rotating magnetic field is not caused by mechanical methods, but in AC pass in a few of the electromagnet, the nature of its magnetic cycle of change can be seen as rotating magnetic field.
转动磁场并不是用机械方法造成的，而是以交流电通于数对电磁铁中，使其磁极性质循环改变，可看作为转动磁场。
By placing our bodies and environments in alignment with the magnetic axis, we can think and act more in tune with nature.
把我们的身体和环境都在磁力线与轴我们的思想和行动更加符合性。
By placing our bodies and environments in alignment with the magnetic axis, we can think and act more in tune with nature.
把我们的身体和环境都在磁力线与轴我们的思想和行动更加符合性。
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