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什么是回声？

什么是回声？. 回声是声波在传播的过程中被障碍物反射回来形成的声音。发出的声音叫原声，被反射回来的声音叫回声。. 模拟回声效果. 乐句练习. 什么是真正的友谊？. 友谊其实很简单，就是有了困难互相帮助，有了喜悦共同分享；友谊也是一朵花，只有在双方的浇灌下才能越开越美，愿友谊的回声永远飘荡在我们的周围。同学们：让我们挥起友谊之手和老师说再见吧。.

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什么是回声？

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  1. 什么是回声？ • 回声是声波在传播的过程中被障碍物反射回来形成的声音。发出的声音叫原声，被反射回来的声音叫回声。

  2. 模拟回声效果

  3. 乐句练习

  4. 什么是真正的友谊？ • 友谊其实很简单，就是有了困难互相帮助，有了喜悦共同分享；友谊也是一朵花，只有在双方的浇灌下才能越开越美，愿友谊的回声永远飘荡在我们的周围。同学们：让我们挥起友谊之手和老师说再见吧。

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