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Ack: Indicates that the acknowledgment number field is significant.

ACK：表明确认号字段是有意义的。

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First is the definition of this Acknowledgment or ack; both SOAP stacks must understand what an ack is: what it looks like, what it means, and how to send it.

首先是Acknowledgment或者ack的定义；两个soap堆栈都必须理解ack是什么：其像什么，它意味着什么，以及如何发送它。

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