单项选择题 A system administrator has disabled USB ports after experiencing several virus outbreaks. A user needs to transfer several extremely large work related files from their home desktop computer to their work desktop computer. Which of the following will allow the user to transfer the needed files?（）

单项选择题 Which of the following commands will make exact duplicates of files and directory trees?（）

单项选择题 Which of the following commands would be used to move the working directory from C:\ to C:\Windows?（）