错误:
NaHCO3 %2B CH2%28COOH%292 %3D CH3COONa %2B H2O %2B CO2
^不需要的字符 ('%')NaHCO3 %2B CH2%28COOH%292 %3D CH3COONa %2B H2O %2B CO2
^不需要的字符 ('%')