A.I1/I2=U1/U2 B.I1/I2=U2/U1 C.I1/I2=U2²/U1² D.無明顯規(guī)律
A.E1/E2=N1/N2 B.E1/E2=N2/N1 C.E1/E2=N1²/N2² D.無明顯規(guī)律