填空题

A--change name
B--checking for
C--check a disk and displays a status report
D--clear command history
E--copy one or more files to another location
F--delete a directory and all the subdirectories and files in it
G--display files in specified directory and all subdirectories
H--expand memory
I--find file
J--fix errors on the disk
K--press a key to resume
L--repeat last find
M--save as
N--switch to
O--lodging 清除命令历史 ( ) 扩展内存