简述体育信息资料和档案管理。

A. 电热管
B. 电热盘
C. 电磁阀
D. 杆簧管

A. 正确
B. 错误

A role can be given to a maximum of 1000 users.
B. A user can have access to a maximum of 10 roles.
C. A role can have a maximum of 100 privileges contained in it.
D. Privileges are given to a role by using the CREATE ROLE statement.
E. A role is a named group of related privileges that can be granted to the user.
F. A user can have access to several roles, and several users can be assigned the same role.