在网络通信中,一般用哪一类算法来保证机密性?()
A、对称加密算法
B、消息认证码算法
C、消息摘要算法
D、数字签名算法
参考答案:A
Speaker A: Would you please close the window I feel a bit cold. Speaker B: ().
A. All right. I hope someone will close it.
B. Oh, I’m sorry, but maybe you should put on your sweater. We need some fresh air.
C. Who has opened the window I feel cold too.
D. If you feel cold, you can put on more clothes.
装维延伸服务工单没有退单功能,如用户不需要延伸服务,回单不填写服务数目即可。