Evee1
Evee1
14-05-2015
Health
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sound with a frequency above 20000 hertz
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Аноним
Аноним
17-05-2015
A sound with a frequency above 20,000 hertz is called an "ultrasound"
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amyhyd
amyhyd
18-05-2015
An ultra sound is a sound which has a frequency above 20 000 hertz
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