问题
单项选择题
IPv6协议数据单元由一个固定头部和若干个扩展头部以及上层协议提供的负载组成，其中用于表示松散源路由功能的扩展头是 (20) 。如果有多个扩展头部，第一个扩展头部为 (21) 。
A．目标头部
B．路由选择头部
C．分段头部
D．安全封装负荷头部
答案
参考答案：B
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IPv6协议数据单元由一个固定头部和若干个扩展头部以及上层协议提供的负载组成，其中用于表示松散源路由功能的扩展头是 (20) 。如果有多个扩展头部，第一个扩展头部为 (21) 。
A．目标头部
B．路由选择头部
C．分段头部
D．安全封装负荷头部
参考答案：B
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| Do you think of your parents? "Yes, of course." you may answer, "I buy a present for my mother on 1 . And I give my father a present on Father's Day, too." Then what about the other days of a year? Always 2 to think of your parents, not just on some 3 days. I have a friend. She 4 alone, because her parents live in another city. One day I went to see her. We had a nice talk. Then she wanted to make a telephone call. She dialed (拨) the number, but then she put the phone 5 . After about ten seconds, she dialed the number again."Hi, Mom …" Later, I asked,"Why did you dial the number 6 ?" She smiled,"My parents are old. They can't get 7 the telephone quickly. I always do so when I call them. I just want to give them 8 time to answer the call." My friend is a good girl. She is always 9 her parents, so why not 10 her? You'll also be a good child. | ||||
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