做项目的时候使用GPIO16 GPIO25测试硬件功能来点亮发光二极管，并且初始化的时候都为数字IO口，内部上拉电阻使能，设置为输出模式，然后我并没有给他们置位，然而在我测试的时候发现居然可以点亮发光二极管，大神能否解释一下，而且附一张引脚内部上拉电阻的电路图
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