题目内容 (请给出正确答案)
提问人:网友z*****n 发布时间:2022年3月21日 23:40
[单项选择题]

一个网络协议至少包括三个要素,()不是网络协议要素。

A.语法 

B.语义

C.层次

D.时序

参考答案
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