RE: Прикупил книгу [↻50%]

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Прикупил книгу [↻50%]

in sbdgiveaway •  7 years ago 

Did you hear that? Sound frequency is measured in Hertz (Hz). The higher the Hertz, the higher-pitched the sound. Dogs hear best at 8,000 Hz, while humans hear best at around 2,000 Hz.

sbdgiveaway dog
7 years ago by

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