仿真共射放大电路时，用示波器双踪器测量输入输出波形如下，ChannelA为输入信号，ChannelB为输入信号，则该电路的放大倍数约为（ ）。72608e65c8460a795cce7a68f056aa9d.png

A: Do you mind if I change the channelB: (). A: Actually, I think this program is quite interesting. B: Yes, you can switch to the channel you want to watch. C: Never mind. Just go ahead. D: Certainly. You can do what you like.