单项选择题

设仅包含根结点的二叉树的高度为0，则高度为k的二叉树的最大结点数为

A．2K+1
B．2K+1+1
C．2K+1-1
D．2k+1
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单项选择题
Which UNIX command creates a symbolic link named myfile in the current directory to the file etc hosts
A．In -s/etc/hosts myfile
B．In -s myfile/etc/hosts
C．link -s/etc/hosts myfile
D．link -s myfile/etc/hosts
单项选择题
There are a kind of persons who use computer to deal with data and produce some information，but they do not change the hardware system and the software system．Which kind of person are they
A．system architect
B．language creator
C．terminal user
D．computer scientist
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