— Cheer up! You might be granted        second chance for it.

—Not possible, since no such        thing has ever happened before

A．a ; a

B．the; a

C．a;不填

D．the;不填

电路中（）较大时，可以起到较好的阻尼作用，使过电压较快消失。

A、电阻

B、电感

C、电容

D、电气