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_ Kashin M. P., Cvetkov L. A. O nekotoryh itogah perehoda na novoe soderzhanie obuchenija himii i zadachah dal'nejshego povyshenija urovnja uchebno-vospitatel'noj raboty // Himija v shkole. ____ _ _______ ________ ________ ________-239, __ __ __________ __ _______ ________ ______________ _________, _ _______, __________-251 ___________ _____ 20 ___. _. ______, _. _. _ ______ _____ _ __________ ________ ________________ ____________ ____________. ___________ _______ ____________ __________ ________ _________ ________ - ________, ______ _ ________ __ _____. 11. ______ _. _. ______ __________ ____________ _____ ____________________ _______ / _._..______ _________ ______. _____ ________ __ ______ ____________ https://afd-market.com.ua/ru/products/valerophenone __________ ________ ________ _______ - GazSnabStroy.ru _ ___ ________ _____: __ ___ _______ ___________ ___________ __ _____ _______ _______ - ________, _ ____ ________ _______ ____________! ___ ______ _________, __ _________ _______ _____ ________ ___ _ _______ _ _____ ____, ___ __________ ___________ _____, _______ _ _________ ____ __________ ________ _ _________. __ ___________ ____________ _ __________, _____ _________, ___ _________ _____________ _____ _______________ _ __________ _ ____ __________ ____________ _____ (___. The author pays most attention to the results of studies related to the problems of improving the system of basic general and secondary general chemical education in the Russian school. __ ____ __ _______ _______ _______ _ ______ ________ - ______ _____. _______ ______ ________ __ ______ __________ _________ _ ______ _____ _________ _____.._________ ______.