【单选题】【消耗次数：1】
网络协议主要要素为（）。
①
数据格式.编码.信号电平
②
数据格式.控制信息.速度匹配
③
语法.语义.同步
④
编码.控制信息.同步
参考答案：
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网络协议三要素为[填空]、语义、同步
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