可以用模拟输入模块SM331-7NF00进行参数设置的最大干扰频率是多少？
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When should you create a role? （）
A. To simplify the process of creating new users using the CREATE USER xxx IDENTIFIED by yyy statement.
B. To grant a group of related privileges to a user.
C. When the number of people using the database is very high.
D. To simplify the process of granting and revoking privileges.
E. To simplify profile maintenance for a user who is constantly traveling.
Everyone knows where the shop is, but who's the owner? （）
A. Steve.
B. Everyone does.
C. At the next door.
D. Yes, it‘s a secret.
对于外锁闭装置及相差设备工、电部门维护分工是如何规定的？
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