两个频率一起每秒产生3个beat,一个频率400（振动/秒）另一个是多少?答案是403（振动/秒）或397（振动/秒）这是为什么呢

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• 两个频率一起每秒产生3个beat,一个频率400（振动/秒）另一个是多少?
• 两个频率一起每秒产生3个beat,一个频率400（振动/秒）另一个是多少?答案是403（振动/秒）或397（振动/秒）这是为什么呢
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