The spatial distribution characteristics of gravity and magnetic field are highly visible, so that they are the important basises of researching the field-source.
重磁位场的空间分布特征，具有较强的直观性，是研究场源体的重要依据。
Key design method and the characteristics of magnetic field distribution of memory motors are studied in this paper.
研究了记忆电机的设计方法，分析了记忆电机的磁场分布特点。
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