Лекция по физике №17. Бумага. Виды и критерии качества
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![[Урок 16] Сокрытое значение печати (начертания)•трубы•песни](https://sun9-20.userapi.com/OzK3ok_hmT3jGFBCma-NwFGNYOTHO3rKExGa7A/IC9HoIXNv_U.jpg)
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