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【单选题】
以下关于TCP报头格式的描述中,错误的是
A.
报头长度为20~60B,其中固定部分为20B
B.
端口号字段分别表示报的源端口号与目的端口号
C.
控制字段定义了8种用于TCP连接、流量控制,以及数据传送的控制位或标志位
D.
TCP校验和伪头部中IP分组头的协议字段值为6
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