题目内容

What forms the basis of civilized society?

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According to the passage, what is Lei Feng’s spirit?It is helping others for __________ and being content with ___________________________.

What do reports of passers-by hesitating to help people in need show?The reports show that it seems hard ________________________ in modern society.

在某以太网中,数据在网络层封装的是____,数据在数据链路层解封装的是____ ?

A. IP头部;Ethernet头部
B. IP头部;Ethernet头部及尾部
C. TCP头部;Ethernet头部及尾部

二进制数1010 1101转换为十进制数是()。

A. 173
B. AD
C. 172
D. 113

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