The impedance matrix element is calculated by the dipole model method when the distance between the equivalent dipole element and the observation point is beyond a critical distance.
当等效偶极子单元离观察点大于临界距离时，用偶极子模型法计算阻抗矩阵元素。
Make a mark, the attention is added more when be being reviewed again later, also was equivalent to labelling to oneself at the same time review a focal point.
做个记号，以后再复习的时候就多加注意，同时也相当于给自己标记了复习重点。
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