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【单选题】
混合加密有两种密码体制的优点,既解决了( )的困难,又解决了( )的问题,从而构成了一种理想的密码得到广泛的应用A.
公钥密码 私钥密码
B.
非对称密码体制 对称密码体制
C.
密钥管理 加、解密速度
D.
常规密码体制 单密钥密码体制
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举一反三
【单选题】Which of the following is NOT true?
A.
All of us can lead varied lives through the pages of books.
B.
We can travel by book free of charge to our heart's content.
C.
We should rely on reading to escape from the seemingly dull realities of everyday life.
D.
Valuable experiences can be obtained from reading good books.
【单选题】The adult mosquito usually lives for about thirty days, although the life span varied widely with temperature, humidity, and other factors of the environment.
A.
about
B.
although
C.
varied
D.
other
【判断题】Varied factors can influence wo rkplace efficiency. These include exterior factors and interior factors .
A.
正确
B.
错误
【单选题】I ______ the book. I may well borrow one from the library.
A.
need to have bought
B.
need have bought
C.
needed not bought
D.
needn't have bought
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