报盘以最后确认为准
to offer subject to final confirmation
不予确认字符
NAK Negative AcKnowledge character
发送正确认前等候
wait before transmit positive acknowledgement
反确认字符
NAC Negative Acknowledge Character
负确认字符
negative acknowledge character
局域网仿真确认服务
LECS LAN Emulation Confirmation Service
确认和计量
identification and measurement