【简答题】(1) Three persons independently decipher a password. The probability they can independently decipher the password is 1/5,1/4,1/3, respectively, then the probability that the password deciphered is =
【单选题】strong cryptography is cipher that is very difficult to decipher without possession of the appropriate ( ).
【简答题】数据库概念设计的E-R方法,在E-R图中属性用 ______ 表示。
【单选题】It is a headache to decipher his sloopy _____.
【单选题】E-R图中,用属性描述实体的特征,属性在E-R图中用( )表示。