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一、正确认识磁场在磁体的周围存在着看不见、摸不着的磁场,对于磁场的存在、磁场的方向、磁场的性质,我们是通过
First, correctly understand the magnetic field There is an invisible magnetic field around the magnet. For the existence of the magnetic field, the direction of the magnetic field, and the nature of the magnetic field, we pass