纯五度

纯五度在音数为3又2分之1(3½)的五度音程谓之，在台湾称作完全五度，如C-G，D-A，E-B，Bb-F，B-F#，F#-C#，Cb-Gb等就是纯五度。纯五度的二个音，其频率比会有3:2的关系。

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