问题
单项选择题
按密钥的使用个数，密码系统可以分为（）
A.置换密码系统和易位密码系统
B.分组密码系统和序列密码系统
C.对称密码系统和非对称密码系统
D.密码系统和密码分析系统
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
按密钥的使用个数，密码系统可以分为（）
A.置换密码系统和易位密码系统
B.分组密码系统和序列密码系统
C.对称密码系统和非对称密码系统
D.密码系统和密码分析系统
参考答案：C
Maybe you know about Sun Ying on TV. She is a young woman. She was born in Jilin Province. In January 2006, she left her hometown Shenzhen. She found a job in a factory and began to work there. after working for seven months, she went to a mountain shool in Guizhou Province for because she wanted to help the students there. She found that the school had but(除…之外) the old houses without doors. She felt quite . When she got there, she got a warm . The students called her“Aunt”and the parents food to her. All the people her. She planned to work there all her life. She wanted to bring to the kids there.
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