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Vasilenko Olga Petrovna chemistry teacher at MBOU Secondary School No. 70 in Krasnodar 1. Who...
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Volobueva Natalya Vladimirovna Chemistry teacherHigher qualification categoryMOUL No. 1 in Apsheronsk Task 1....
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Orlova Olga DmitrievnaTeacher of chemistry and biology, Nikitovskaya Secondary School named after..
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Quizzes Joke chemistry. Quiz
Which element is always happy? Which gas claims it is...
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