错误:
MnO4%3A- %2B NO2%3A- %2B H3O%3A%2B %3D NO3%3A- %2B Mn%3A2%2B %2B H2O
^
不需要的字符 ('%')MnO4%3A- %2B NO2%3A- %2B H3O%3A%2B %3D NO3%3A- %2B Mn%3A2%2B %2B H2O
^
不需要的字符 ('%')