A--to open (edit/create) a document B--to access the Block and save Menu C--to exit WINDOWS D--to cancel a command E--to restore text just erased F--to move cursor one character to the right G--to move cursor one word to the left H--to move curse one line down I--to insert gage number J--to print a file K--to move cursor to the bottom right of the screen L--to insert date and time M--to copy a file N--to rename a file O--to erase a file P--to erase a line ( )恢复刚被删除文本 ( )取消命令