July 2022 1 11 Report
тугоплавкое стекло, используемое для изготовления химической посуды, содержит 18,43% оксида калия, 10,98% оксида кальция, 70,59% оксида кремния(IV). напишите химическую формулу этого стекла в виде соединения оксидов
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