错误:
FeCl2 %2B K3%5BFe%28CN%296%5D %3D KCl %2B KFe%5BFe%28CN%296%5D
^
不需要的字符 ('%')FeCl2 %2B K3%5BFe%28CN%296%5D %3D KCl %2B KFe%5BFe%28CN%296%5D
^
不需要的字符 ('%')