错误:
Na2COONa %2B CH3COOH %3D CH3COONa %2B CO2 %2B H2O
^
不需要的字符 ('%')Na2COONa %2B CH3COOH %3D CH3COONa %2B CO2 %2B H2O
^
不需要的字符 ('%')