Нагрузка и здоровье школьников. Как решать проблему Говорите правду
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![Плетеные шнуры: их “диаметр“ и разрывная нагрузка [salapinru]](https://sun9-80.userapi.com/c858024/v858024717/23cf34/R1oatTK7Loc.jpg)
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