题目内容

People find it very _______ if their complaints are just ignored.

A. annoy
B. annoying
C. annoyed
D. annoys

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It is more _______ to complain by email rather than having to write a letter.

A. convenience
B. convenient
C. much convenient
D. conveniently

The firm had a lot of _______ customers, which is one of the reasons it went bankrupt.

A. satisfy
B. satisfied
C. dissatisfy
D. dissatisfied

数据加密标准(DES)明文位,密钥初始长度位,但有效密钥长度是位。

一个密码系统至少由、、、和5部分组成,而其安全性是由决定的。