如图所示,两只电流表都有0.6A和3A两个量程,当开关S闭合后,两电流表指针偏转角度相同,则通过L1、L2两灯的电流之比为()
A.I1:I2=4:1
B.I1:I2=1:4
C.I1:I2=5:1
D.I1:I2=1:5