错误:
Cl2 %2B Ca%28OH%292 %3D HCl %2B CaCl2 %2B Ca%28ClO3%292
^不需要的字符 ('%')Cl2 %2B Ca%28OH%292 %3D HCl %2B CaCl2 %2B Ca%28ClO3%292
^不需要的字符 ('%')