如图所示，已知电流表A1的读数为0.2A，电流表A的读数为0.3A．则通过灯泡L2的电流为_________。
0.1A
—Henry, ________ the light is ________ when you leave the lab.
—All right.[ ]
A. be sure; turned on
B. make sure; turned off
C. sure; turning off
D. make sure; turning off
对抗效应
