两列沿相反方向传播的振幅和波长都相同的绳波(如图所示),在相遇的某一时刻,两列波“消失”,此时图中a、b质点的振动方向?答案是a向下b向上没太懂啊
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![两列沿相反方向传播的振幅和波长都相同的绳波(如图所示),在相遇的某一时刻,两列波“消失”,此时图中a、b质点的振动方向?答案是a向下b向上没太懂啊](/uploads/image/z/4871667-3-7.jpg?t=%E4%B8%A4%E5%88%97%E6%B2%BF%E7%9B%B8%E5%8F%8D%E6%96%B9%E5%90%91%E4%BC%A0%E6%92%AD%E7%9A%84%E6%8C%AF%E5%B9%85%E5%92%8C%E6%B3%A2%E9%95%BF%E9%83%BD%E7%9B%B8%E5%90%8C%E7%9A%84%E7%BB%B3%E6%B3%A2%28%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%29%2C%E5%9C%A8%E7%9B%B8%E9%81%87%E7%9A%84%E6%9F%90%E4%B8%80%E6%97%B6%E5%88%BB%2C%E4%B8%A4%E5%88%97%E6%B3%A2%E2%80%9C%E6%B6%88%E5%A4%B1%E2%80%9D%2C%E6%AD%A4%E6%97%B6%E5%9B%BE%E4%B8%ADa%E3%80%81b%E8%B4%A8%E7%82%B9%E7%9A%84%E6%8C%AF%E5%8A%A8%E6%96%B9%E5%90%91%3F%E7%AD%94%E6%A1%88%E6%98%AFa%E5%90%91%E4%B8%8Bb%E5%90%91%E4%B8%8A%E6%B2%A1%E5%A4%AA%E6%87%82%E5%95%8A)
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