φθ(Fe2+/Fe)＝－0.45V，φθ(Ag+/Ag)＝0.80V，φθ(Fe3+/Fe2+)＝0.77V，the strongest oxidant and reducing agent in the above pairsat standard state are respectively A: Ag+，Fe2+ B: Ag+，Fe C: Fe3+，Fe D: Fe2+，Ag E: Ag，Fe3+
φθ(Fe2+/Fe)＝－0.45V，φθ(Ag+/Ag)＝0.80V，φθ(Fe3+/Fe2+)＝0.77V，the strongest oxidant and reducing agent in the above pairsat standard state are respectively A: Ag+，Fe2+ B: Ag+，Fe C: Fe3+，Fe D: Fe2+，Ag E: Ag，Fe3+
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