【单选题】
安全的密码设定应包含以下哪些字符.（ ）___
A. 数字，任意字母即可
B. 数字，字母大小写，特殊字符其中三种
C. 数字，字母大小写，特殊字符其中三种
D. 数字，字母大小写
E.
F.
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答案
B
解析
暂无解析
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2___
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D. 党的十八届五中全会
