基本解释否定字符词组短语短语NAK Negative AcKnowledge character 否认符;否认信号NAC Negative Acknowledge Character 反确认字符character negative acknowledge 字符负确认negative acknowledge character更多词组专业释义计算机科学技术否认字符否定字符否认字元负确认字元反确认字元电子、通信与自动控制技术否认字符否定字符机械工程不认可字元