填空题
A -- to enter new time
B -- to insert new diskette
C -- to type A: my file
D -- to choose an option
E -- to continue execution
F -- to delete files
G -- to allow network access
H -- to check all files
I -- to copy another disk
J -- to change password
K -- to press ESC to exit
L -- to set name
M -- to read only
N -- to recover a file
O -- to remove both keys
P -- to restore a file
Q -- to find a "string"
R -- to join d:
S -- to select date
T -- to replace
U -- to go directly to disk and special function