Определение нормальной густоты цементного теста
Тверской государственный технический университет.
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![Неделя заботы о здоровье крови. [Шишова О.И.]](https://sun9-45.userapi.com/kSGOrUg3z6pZXDH8_Ud7F27E2bf1LwbRsanfvQ/v6HmYyXzxA0.jpg)
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