【单选题】我国现行宪法规定,退休人员的生活受到:( )
【简答题】密钥分配中心技术-KDC,常用于对称密码体制中______的分配;密钥认证中心技术-CA证书,更多的用于公开密码体制中______ 的分配。
【简答题】时态填空。 1. Listen! Someone _______ (sing) in the next room. 2. There _______ (be) an exhibition of art in the museum tomorrow. 3. Everyone in our class _______ (enjoy) music very much. 4. It's so cloudy...