系统管理员与帐套主管的权限有何区别？

A. plus
B. minus
C. mutiply
D. devide

A. 300,000 kilometres a second
B. a second 300,000 kilometres
C. every second 300,000 kilometres
D. 300,000 kilometre every second

A. very laong
B. longer
C. longest
D. the longest