...h Acknowledge）、非确认的主动数据消息（Unsolicited Data Message without Acknowledge）、确认消息 （Acknowledge Messages）。表3．1列出了这六种消息的发送序列。
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It is courteous to acknowledge messages which are received.
告诉对方你收到信息是应有的礼节。
Recipients of messages must be able to acknowledge the fact that they actually did in fact receive the message.
消息的接收方必须能够确认这样一个事实，即实际上他们已经确确实实接收到了消息。
Secondly, the RMD doesn't have to acknowledge the messages it has received.
其次，RMD并非必须对它已接收到的全部消息作出确认。
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