图3
A.当合上开关K接通电路时,A2先亮,A1后亮,最后一样亮
B.当合上开关K接通电路时,A1和A2始终一样亮
C.当断开开关K切断电路时,A2立即熄灭,A1过一会儿才熄灭
D.当断开开关K切断电路时,A1和A2立刻熄灭
A