短語詞組短語negative acknowledge character [計][通信]否認(rèn)字符;[計]否定字符;反確認(rèn)字符;不認(rèn)可字符NAK Negative AcKnowledge character 否認(rèn)符;否認(rèn)信號NAC Negative Acknowledge Character 反確認(rèn)字符 返回 character negative acknowledge