错误:
Ca5%28PO4%293F %2B H2SO4 %3D Ca%28H2PO4%292 %2B CaSO4 %2B HF
^
不需要的字符 ('%')Ca5%28PO4%293F %2B H2SO4 %3D Ca%28H2PO4%292 %2B CaSO4 %2B HF
^
不需要的字符 ('%')