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【单选题】
根据下面的文字资料回答 6～9 题 TCP是一个面向连接的协议，它提供连接的功能是全双工的，采用（ 2 ）技术实现可靠数据流的传送。为了提高效率，又引入了滑动窗口协议，协议规定重传（ 3 ）的分组，这种分组的数量最多可以（ 4 ），TCP协议采用滑动窗口协议来解决了（ 5 ）。 第6题：文中（ 2 ）处正确的答案是（ ）。
A.
超时重传
B.
肯定确认(捎带一个分组的序号)
C.
超时重传和肯定确认(捎带一个分组的序号)
D.
丢失重传和重复确认
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