按照美国国防部安全准则，UNIX系统能够达到的安全级别为
A．C1
B．C2
C．B1
D．B2
参考答案：B
解析：美国国防部和国家标准局的可信计算机系统评估准则(TCSEC)定义了4个安全级别：A，B，C和D，各层又进一步划分为7个层次。其中C2级提供比C1级系统粒度更细微的自主式访问控制，能够达到C2级的操作系统有UNIX，XENIX，Novell3.x和WindowsNT。
Accident Report Form
A . at 9:30 a.m. B. at 9:30 p.m. C.9:40 p.m. 小题2:How many people were trapped in the car? A . one B. two. C. three. 小题3:Whose left leg was hurt? A . Mrs. Green’s B. Mr. Green’s. C. Their daughter’s. 小题4:What was the weather like that day? A . It was sunny B. It was snowy. C. It was rainy. 小题5:Which of the following is True? A .The car crashed into a wall. B. The car accident happened on Zhongshan Road in Nanjing. C. Half an hour later the policemen sent the victims to the hospital. |