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在理解 load present时，遇到困到，
首先要理解chg内部构造，图2中黄色背景部分，只说了chg=0时，连接到一个一个1M的电阻，其实我不能想象，有大神画个示意图吗
我能够理解图1中侦测路径，但是不能理解侦测的机制
刚学没多久，求大神指教
