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【多选题】
以下关于串级控制系统设计的说法哪个是错误的?A.
主调节器应选择P规律。
B.
副参数可以有余差，所以不需要引入积分控制。
C.
主、副回路控制都是越快越好。
D.
副回路的扰动越多越好。
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反馈参考答案：
举一反三
【单选题】下面列出的条目中,哪些是文件系统阶段的主要特点( ) I. 独立性差 II.数据的冗余度大 III. 较高的数据独立性 IV.共享性差
A.
Ⅰ、Ⅱ和Ⅲ
B.
Ⅰ和Ⅱ
C.
Ⅰ、Ⅱ和Ⅳ
D.
都是
【单选题】Information collected by an organization from a variety of external and internal databases is stored in this special type of database.
A.
Data warehouse
B.
Commercial database
C.
Company database
D.
Company warehouse
【单选题】Which of the following is a problem with using internal databases?
A.
the information was collected for another reason
B.
the information is in the wrong format
C.
the information may be out of date
D.
all of the above
【判断题】Internal databases usually can be accessed more quickly and cheaply than other information sources.
A.
正确
B.
错误
【简答题】Which of the following is a disadvantage of using information from internal databases?
【单选题】Which of the following is a common source of data supplied to internal databases?
A.
the mass media
B.
the stockholders
C.
the marketing department
D.
the competitors
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