问题描述:
写出下列符号中加点数字的含义
(1)2O含义__________________
(2)N2含义___________________
(3)3CO2含义________________
(4)2SO3含义_________________
(1)2O含义__________________
(2)N2含义___________________
(3)3CO2含义________________
(4)2SO3含义_________________
问题解答:
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