Type into the member function Main a few lines of code to create an instance of Quad and then assert that when the object Area method is given a length of 3 and width of 2, it returns the value 6.
在主函数中输入下列几行代码，创建Quad实例，并通过Assert断言，当长宽各为3和2时，返回的结果应该是6。
Avoid creating standard cells of the same type that vary greatly in width.
同意类型的标准单元避免宽度变化过大。
The pulse width modulation character of voltage drive -type pulse width modulator TL494 is introduced. The applicable situation of TL494 in semi -bridge alternate switch power is also analyzed.
介绍了电压驱动型脉宽调制器件TL494的脉宽调制特性，并对其在半桥变换开关电源中的应用情况做了分析。
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