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並前往https://www.researchgate.net/figure/Average-hearing-thresholds-as-a-function-of-frequency-kHz-for-different-age-groups-The_fig2_261767650

Average hearing thresholds as a function of frequency (kHz ...

No harmonics were detected at frequencies below the test frequency. The harmonic distortion was below 0.01% in the EHF range, where the harmonics were well ...

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