错误:
HCl %2B Na3%5BCr%28OH%296%5D %3D H2O %2B NaCl %2B CrCl3
^
不需要的字符 ('%')HCl %2B Na3%5BCr%28OH%296%5D %3D H2O %2B NaCl %2B CrCl3
^
不需要的字符 ('%')