●Heterogeneous network environments consist of computer systems from (66) vendors that run (67) operating systems and communication protocols. An organization that (68) its computer resources is usually (69) the task of integrating its heterogeneous systems. Typically, each department or division has defined its own network needs (70) OS, LAN topology, communication protocols, applications, and other components.
(66) A．same
B．similar
C．different
D．difference
(67) A．same
B．similar
C．different
D．difference
(68) A．consolidates
B．consists
C．considerate
D．consoles
(69) A．faced on
B．faced with
D．faced about
D．faced up to
(70) A．in general
B．in any term
C．in set terms
D．in terms of
未经软件著作权人许可，发表其软件的行为属于侵权行为。()
WINDOW98中，不能在"任务栏"内进行的操作是
A.设置系统日期的时间
B.排列桌面图标
C.排列和切换窗口
D.启动"开始"菜单
关系数据库中的表不应有内容完全相同的行。()
●当关系R和S自然联接时，能够把R和S原该舍弃的元组放到结果关系中的操作是(17)。
(17)A．左外联接
B．右外联接
C．外部并
D．外联接
在Windows系统中，通过开始菜单中的“关机（U）．．．”命令，进行的关机操作是________。
A.真正关闭电源
B.没有真正关闭电源，而是使电源处于休眠状态
C.无效的
D.彻底关机