()是一种基于超连接(Hyperlink)的超文本(Hypertext)系统,是最为流行的信息检索服务程序。
A.BBS
B.WWW网
C.FTP
D.SMTP
参考答案:B
绝大多数人机事故是可以采取( )等预先识别技术加以防范的。
A.故障诊断
B.偏离操作
C.系统特性
D.综合诊断
The number of the people in the room_______sixty, but a number of them_________students.
A.was, was
B.was, were
C.were, were
D.were, was