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图示1能否解释一下？图示2可以接5V吗？图示3可以接地吗？
均可以, 两个G 是输入端口, X 可接任何电平, 但不要悬空
1中的Vid需要大于等于Vit+=200mV， 2中的X指的是不论高低电平，只要3中的/G是低电平，输出均为高。
