A:-2
B:4
C:3
D:-2或3
如图所示,电源电压U=10V,定值电阻R=20Ω,闭合开关S,电压表的示数是6V,通过小灯泡的电流是( )
– Tell me _____ my phone, Sam.
– It was just beside the briefcase, grandma.