搜题请搜索小程序“爱下问搜题”
问题 单项选择题

为了保证计算机网络信息交换过程的合法性和有效性，通常采用对用户身份的鉴别。下面不属于用户身份鉴别的方法是（）。

A．报文鉴别

B．身份认证

C．数字签名

D．安全扫描

答案

参考答案：D

阅读理解
阅读理解。根据卡片内容，判断正(T)误(F)。
    My four friends talked about their weekends. And they wrote something on these cards.
    I stayed at home and studied over the weekend. I studied for my English course on Saturday.
Yesterday I wrote a history paper (考卷). In the evening I talked to my pen pal on the phone.
What did you do?
                                                                                                                                Judy
    I had a good time. On Saturday morning I played tennis, in the afternoon I went to the zoo,
and in the evening I went to Nancy's birthday party. On Sunday I went to the mountain with my
friend. 
                                                                                                                                Tim
    Oh, your weekend was great. But mine was boring. I stayed at home the whole weekend. I
cleaned my room and washed my clothes. I helped my mother do some housework. Did you
go out?
                                                                                                                                Mary
    No, I didn't. I stayed at home and watched TV on Saturday. Yesterday I watched a movie,
Last Blue Ballet. It was very exciting. 
                                                                                                                                Dave
( ) 1. Tim went to the zoo last weekend.
(     ) 2. Mary washed the clothes last weekend.
(     ) 3. On Sunday night, Judy watched a movie, Last Blue Ballet.
( ) 4. Dave played tennis last weekend.
(     ) 5. In the evening , Judy talked to her pen pal on the phone.
查看答案
单项选择题

指令寄存器的位数取决于( )。

A．存储器容量

B．机器字长

C．指令字长

D．指令字长和机器字长
查看答案