multisim9基本分析方法，Multisim9介绍和虚拟仪器使用，波形发生器应用的测量，射极跟随器，二级低阶滤波器等。-multisim9 basic analysis methods, Multisim9 introduction and use of virtual instruments, measuring waveform generator applications, emitter follower, two low-order filters.