错误:
NaOH %2B NH4Fe%28SO4%292 %3D H2O %2B Na2SO4 %2B NH3 %2B Fe%28OH%293
^
不需要的字符 ('%')NaOH %2B NH4Fe%28SO4%292 %3D H2O %2B Na2SO4 %2B NH3 %2B Fe%28OH%293
^
不需要的字符 ('%')