Задачи по химии. Газовые смеси. Тест B12 РТ по химии 2014 2015 этап 2.
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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