错误:
H2S %2B %5BAg%28NH3%292%5DCl %3D NH3 %2B NH4Cl %2B Ag2S
^
不需要的字符 ('%')H2S %2B %5BAg%28NH3%292%5DCl %3D NH3 %2B NH4Cl %2B Ag2S
^
不需要的字符 ('%')