chuka_lis: (Default)
chuka_lis ([personal profile] chuka_lis) wrote 2017-06-20 06:21 am (UTC)

думаю, с круговым дивжением жидкости- если есть эффект повышения частоты звука при замедлении ее движения. где-то там одни волны накладывюатся на другие.
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