错误:
H2O %2B OH%3A- %2B Be %3D H2 %2B %5BBe%28OH%294%5D%3A2-
^
不需要的字符 ('%')H2O %2B OH%3A- %2B Be %3D H2 %2B %5BBe%28OH%294%5D%3A2-
^
不需要的字符 ('%')