错误:
CuSO4 %2B NH3 %2B H2O %3D %28NH4%292*SO4 %2B Cu%28OH%292
^不需要的字符 ('%')CuSO4 %2B NH3 %2B H2O %3D %28NH4%292*SO4 %2B Cu%28OH%292
^不需要的字符 ('%')