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33. 下列电对：Sn2+/Sn、Cu2+/Cu、Fe2+/Fe、Ag+/Ag的值分别是-0.136V、0.34V、-0.44V、0.799V，其中最强的氧化剂和最强的还原剂是（） （1分）
A
u2+和F.E.
B
A.G.+和F.E.
C
Sn2+和F.
D
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B
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