单项选择题

下面命题公式中主析取范式中含3个极小项的是

A．p∨q∨r
B．(p∧(┐ p∧q∧
C．p→(q∧
D．┐(p∧┐ ∧(r∨
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单项选择题
Which of the following is not among the basic features of a relational database
A．It does not matter what order the rows are i
B．It does not matter what order the columns are i
C．Different columns should have different column name
D．Different columns should have different data type
单项选择题
In a tree directory of a file system, relative path name can be used to find files for improving directory retrieval. To do this, which directory of the followings should be set up
A．parent directory
B．child directory
C．working directory
D．home directory
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