对于系统,翻版的模拟是在控制图中添加一个创建循环的边,而不仅仅是一个附加节点。
The world is full of obvious things which nobody by any chance ever observes.
In electronics, the smallest component often makes the biggest difference. Never underestimate the power of precision.
The only people who see the whole picture are the ones who step out of the frame.
The best way to predict the future is to create it.