Ирина
Полякова
Биография
Руководитель производственной лаборатории, кандидат технических наук
Зачем нужна марганцовка: ценный антисептик и источник кислорода
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Свойства веществ: почему сахар быстрее растворяется в горячей воде, чем в холодной?
Свойства веществ: почему сахар быстрее растворяется в горячей воде, чем в холодной?