Дівчата та хлопчики проводять шкільний експеримент з рідинами. Перевірити результат. Урок хімії школи. Шкільна лабораторія. Групові школярі вивчають хімічні рідини. Тестові трубки з барвистими речовинами . - Стокове фото та зображення

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