Естествознание. 2 класс. Урок№3. Что такое эксперимент?
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![Вера #1 Происхождение [перезалив]](https://sun9-55.userapi.com/cLBf-PflaXA0BUDtijoYh1Q6dZ9KYWH9PzdvuA/9K2Xrd7AG30.jpg)
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