A、Pt,H<sub>2sub>(p1)│HCl(m1)│H<sub>2sub>(p2),Pt B、Pt,H<sub>2sub>(p)│HCl(m1)‖HCl(m2)│H<sub>2sub>(p),Pt C、Pt,H<sub>2sub>(p)│HCl(m1)┆HCl(m2)│H<sub>2sub>(p),Pt D、Pt,H<sub>2sub>(p)│HCl(m1)│AgCl,Ag-Ag,AgCl│HCl(m1) │H<sub>2sub>(p),Pt