Задачи по химии. Расчёт объёма. Массовая доля. Расчёты по химическим уравнениям
Видео-подготовка к ЦТ и ЕГЭ по химии
В контакте
Репетитор по химии по скайпу (Александр Коньков) и (логин в Skype)
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