添加“电路的简化和用开关控制输入”，“继电器和开关电路”，“与门”，“或门”，“反向器” in gates.md
添加“电路的简化和用开关控制输入”，“继电器和开关电路”，“与门”，“或门”，“反向器” in gates.md

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