磁中性状态
参考答案：
磁性材料或磁体所处的一种状态，在这种状态中与磁畴尺寸相比大得多的范围内，总磁通密度和磁场强度均为零。
—I feel stressed from time to time. Could you give me some advice?
—________ sharing your worries with your parents?
A．How about
B．Why don’t you
C．Why not
D．Would you like
光线交切曲线
