Mother’ s Day is coming . I’ m thinking about _____ .

A．what present I gave her

B．where we had a big meal

C．how I will give her a surprise

D．if I planned a party for her

在有串联补偿电容器的线路上短路暂态过程会出现低频分量，在有并联电抗器是还会产生2个衰减很慢的非周期自由分量。