单项选择题

Which of the following commands is used to delete an empty directory?（）

A.RD
B.EDIT
C.DIR
D.FORMAT

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单项选择题
Which of the following is the default SMTP port?（）

A.21
B.22
C.23
D.25
单项选择题
Which of the following tools would a technician use to map a drive to a user’s machine?（）

A.SSH
B.NETUSE
C.NETSTAT
D.SSL
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