题目内容

用哪条命令使用户切换到dir3的父目录位置[root@RHEL7-1 dir3]#()

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在根目录下的etc目录内有两个目录，有dir2父目录和其内的子目录subdir2在根目录下的home目录内有子目录，home目录内有子目录dirr使用哪条命令切换到子目录subdir2位置[root@RHEL7-1 etc]# ()使用哪条命令切换到子目录dirr位置[root@RHEL7-1 etc]# ()

The subject of an email should be____________.

A. short and to the point
B. straightforward and accurate
C. vague
D. long

When greeting someone whose name you don’t know you can use:

A. Hi,
B. Hello,
C. To whom it may concern
Dear Sir/Madam

When writing a business email, try to avoid:

A. slangs and unnecessary contractions
B. emoticons and emojis
C. profanity
D. jokes