DES算法用来加密的密钥有多少位（）A.24 B.56 C.64 D.128_爱下问搜题

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问题单项选择题

DES算法用来加密的密钥有多少位（）

A.24

B.56

C.64

D.128

答案

参考答案：C

单项选择题 B型题

我国允许使用的发色剂是（）

A.苯甲酸钠

B.叔丁基羟基茴香醚（BHA.

C.亚硝酸钠

D.硫磺

E.糖精钠

填空题

择方框中所给的短语完成句子，每个短语限用一次。

A. belong to B. turn down C. complain about   D. on display
E. in style   F. heard of   G. getting on with   H. even though
I. find out   J. became interested in

1. Don't worry. We'll _____ who has taken your handbag.
2. —Let's go to the Art Center. There are many paintings _____
    —That sounds great.
3. More and more students _____ too much homework.
   They have to go to bed late every day.
4. The wallet must _____ Sam. His ID card is in it.
5. —How are you _____ your classmates in the new school?
   —Very well. We often help each other.
6. We haven't _____ such a place. Where is it?
7. —Carol, could you please _____ the TV? The baby is sleeping in the room.
   —I'm sorry. I will do it right away. 68. He _____ science when he was young.
      Now he is a great scientist.
9. The shop is popular because it sells clothes _____.
10. Zhou Feng never gives up learning English _____ he has some trouble with it.