The three perspectives include: by means of Language Input-output Theory, the new listening class is verified theoretically to be superior to the traditional teaching mode.
其中包括运用语言的输入与输出理论论证视听说课优于传统听力的教学效果；
By signal flow graph, a new universal active current mode second-order filter was designed basis on establishing MOS transistor small-signal model. The filter is of three-input and one-output.
在建立了MOS场效应管小信号模型的基础上，采用信号流图的方法设计了一个三输入一输出的二阶通用有源电流模式滤波器。
The common mode voltage for the output of three-level inverter is analyzed. To diminish the harm caused by the common mode voltage, two control strategies of SPWM are adopted.
文章对三电平逆变器输出中的共模电压进行了分析，为了减小共模电压带来的危害，文中采用了两种SPWM控制策略即传统三电平SPWM控制策略和降低共模电压的三电平SPWM控制策略。
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