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並前往https://www.ece.iastate.edu/~alexs/classes/2016_Spring_575/HW/HW5/files/piano-key-freq-wikipedia.pdf

Piano key frequencies

An 88-key piano, with the octaves numbered and. Middle C (cyan) and A440 (yellow) highlighted. Key number. Helmholtz name. Scientific name. Frequency (Hz).

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