—It's time for lunch, Mum! I am hungry.
—______________
A:I'm sorry to hear that.
B:OK. Let's make some sandwiches.
C:That's all right.
D:Never mind.
如图所示,闭合开关S后, L1和L2两盏电灯都不亮,电流表指针几乎没有偏转,电压表指针明显偏转,该电路的故障可能是()
2.84×(8.5-1.2)=____