A.下降0.48伏 B.下降0.24伏 C.上升0.48伏 D.上升0.24伏
A.E1>E2>E3 B.E2>E1>E3 C.E3>E2>E1 D.E1=E2=E3
A.–0.52V B.0.52V C.0.28V D.0.37V