问题
单项选择题
网络安全技术主要是研究：安全攻击、安全机制和安全服务，以下
Ⅰ．有损网络安全的操作 Ⅱ．用于检测、预防的机制
Ⅲ．安全攻击恢复机制 Ⅳ．信息传输安全性
( )属于安全机制方面的内容。
A．Ⅰ和Ⅱ
B．Ⅱ和Ⅲ
C．Ⅲ和Ⅳ
D．Ⅰ和Ⅳ
答案
参考答案：B
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网络安全技术主要是研究：安全攻击、安全机制和安全服务，以下
Ⅰ．有损网络安全的操作 Ⅱ．用于检测、预防的机制
Ⅲ．安全攻击恢复机制 Ⅳ．信息传输安全性
( )属于安全机制方面的内容。
A．Ⅰ和Ⅱ
B．Ⅱ和Ⅲ
C．Ⅲ和Ⅳ
D．Ⅰ和Ⅳ
参考答案：B
Jim is the son of a farm owner. One New Year's Day, when he was 15 years old, his father him to work on the farm for one year at his free time. Jim was with his father's idea. 'That isn't my job. I have schoolwork to do. ' At hearing this, his father said, 'I promise(答应) to give you the best present if you finish one year's work. , Jim thought for a while and . Starting one Saturday, the boy got up early and worked until evening, just like any other farmer. Time passed . Jim's crops grew very well. On the last day of the year, the father called his son to him, 'I'm happy to see that you have worked very hard the whole year,' said the father, Now, tell me you want.' The boy smiled and showed his father a big piece of bread made from his wheat. 'I've already got the present. No pains, no gains. I think this is what you wanted me to .
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