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【单选题】
关于HDLC协议的帧顺序控制,下面的语句中正确的是()。
A.
如果接收器收到一个正确的信息帧(I),并且发送顺序号落在接收窗口内,则发回确认帧
B.
信息帧(I)和管理帧(S)的控制字段都包含发送顺序号
C.
如果信息帧(I)的控制字段是8位,则发送顺序号的取值范围是0-127
D.
发送器每发出一个信息帧(I),就把窗口向前滑动一格
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The major difference between private and public libraries is their readership.
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D.
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【单选题】下面是URL的是( )。
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www.tsinghua.edu.cn
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B.
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ftp：//ftp.ustc.edu.cn
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C.
172.16.4.100
D.
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www.tsinghua.edu.cn
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http://www.baidu.com
C.
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【简答题】In public speaking, the message is whatever a communicates to someone else. It involves the message, that is, what the speaker says, and the message, which means how he or she say it.
查看完整题目与答案
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A.
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B.
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http://192.168.1.59/index
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B.
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C.
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B.
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D.
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www.tsinghua.edu.cn
B.
http://www.baidu.com
C.
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【判断题】The speaker says she loves getting texts, but too many texts can be a problem.
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