题目内容

串级控制系统中，副控制器的作用方式与（）无关。

A. 主对象特性
B. 副对象特性
C. 执行器的气开气关形式
D. 工艺的安全要求

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Which two statements are true regarding working with dates?（）

A. The default internal storage of dates is in the numeric format
B. The default internal storage of dates is in the character format
C. The RR date format automatically calculates the century from the SYSDATE function and does not allow the user to enter the century
D. The RR date format automatically calculates the century from the SYSDATE function but allows the user to enter the century if required

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