August 2022 1 12 Report
Формулы высших оксидов элементов, порядковые номера которых в Периодической системе 5, 6, 14, записаны в ряду:
1) BeO, CО2, SiО2; 3) B2О3, CО2, SiО2;
2) В2О3, СО, SiО2; 4) B2О3, CО2, SiО2.
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