问题
单项选择题
______ is a single-user multi-task operating system.
A．MS-DOS
B．Windows
C．UNIX
D．Linux
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
______ is a single-user multi-task operating system.
A．MS-DOS
B．Windows
C．UNIX
D．Linux
参考答案：B