Про гидроудар они не слышали видимо.
5 months ago 00:26:57 5
7 months ago 00:07:06 1
![Что нужно знать про гидроудар [Интересная физика]](https://sun9-64.userapi.com/Cd0hTr0KkczZr29d9VqYyIu8KYQKx07P97WeXg/-_xfYpDLHd4.jpg)
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