删除组stuff的命令是( ).
A.
B. groupdel stuff
C. B.
D. groupadd stuff
E. group stuff
F. D.
G. gpasswd stuff
系统管理员应该采用哪些安全措施?()
A. 把root密码告诉每一位用户
B. 设置Telnet服务来提供远程系统维护
C. 经常检测帐户数量、内存信息和磁盘信息
D. 当员工辞职后,立刻删除该用户帐户
—_____ he ____ his lunch?— Yes, he did.
A. Does ,has
B. Does, have
C. Did, have
Did, had
—Did the thieves _____ into the car?—No, they______.
A. fell, didn’t
B. fall(落下), did
C. jump(跳), didn’t
D. jump, did