问题
单项选择题
IP是指网际协议，它对应于开放系统互连参考模型中的______。
A．物理层
B．数据链路层
C．传输层
D．网络层
答案
参考答案：D
解析： IP对应于开放系统互连模型中的网络层，主要负责为计算机之间传输的数据报寻址，并管理这些数据报的分片过程。同时IP还负责数据报的路由，决定数据报发送到哪里，以及在路由出现问题时更换路由。
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IP是指网际协议，它对应于开放系统互连参考模型中的______。
A．物理层
B．数据链路层
C．传输层
D．网络层
参考答案：D
解析： IP对应于开放系统互连模型中的网络层，主要负责为计算机之间传输的数据报寻址，并管理这些数据报的分片过程。同时IP还负责数据报的路由，决定数据报发送到哪里，以及在路由出现问题时更换路由。
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| Marianne, a schoolgirl, was learning to play the piano, and day after day her father stood behind her as she practiced. How very patient and loving 1 was, and how cleverly he showed Marianne 2 to play some difficult pieces! She was making progress, and that was excellent. And there, almost last in the big chair, sat Wolfgang, her four-year-old 3 , who never had to be told to 4 quiet when Marianne was 5 . One evening at sundown the father patted Marianne's shoulder, 6 she had dome very well. At the moment Wolfgang climbed on his father's knee and begged to play the pretty 7 Marianne had now mastered. What a 8 that was! Picking his baby son, the father 9 , tapped the nose and said, "Look at your small 10 . You must wait, like man. You must wait!" There was no end, and Marianne had to tell her mother about Wolfgang wanting to 11 one of the classics. After 12 Marianne helped clear away the dishes when the father lit his pipe (烟斗). But the pipe went out. He was on his feet. "Listen! Marianne is playing that piece 13 than ever!" But Marianne was washing pots in the kitchen. His wife following, he went up  stairs, the lamp in one hand, his pipe in 14 ,he pushed open the door, and there was little Wolfgang 15 in the darkness. "I love it so!" whispered the child. It was the beginning of Mozart's life of music. | ||||
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