当这两列波相遇时会发生干涉现象,两列波恰好重合时,振幅矢量相加,于是就是D答案,刚好第一列波左半周期是凸起来的,第二列波左半周期凹下去,互相抵消,右半周期同理.怎么没有财富值?
When the waves occupy exactly the same space at the same tim
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