标签：φθ(Sn4+/Sn2+)= 0.15 V) 。 A: 2×(0.77-0.15)/0.059 B: 2×(0.15-0.77)/0.059 C: (0.77-0.15)/0.059 D: 3×(0.77-0.15)/0.059 答案: 2×(0.77-0.15)/0.059 4