单项选择题

文件系统向用户提供若干条系统调用，其中打开文件的功能是

A．提出建立文件请求
B．把文件调入内存
C．把文件控制块调出内存
D．把文件控制块调入内存的活动文件目录表
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单项选择题
这些二叉排序树中最佳二叉排序树有
A．6棵
B．5棵
C．4棵
D．3棵
单项选择题
which descnption is NOT true
A．Personal computer has not the features of the larger syste
B．Large systems offer higher processing speeds for user and return more data than PC
C．Output devices take output results from the CPU in machine-coded form and conven them into a form that used by peopl
D．The input/output devices and auxiliary storage units of a computer system are called peripheral
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