c) AOV network D) AOE network
(69) To control and manage processes,which of the following data structures should be set up?_____.
A) PCT B) PCB C) PCM D) PCL
(70) In a tree directory of a file system, relative path nam can be used to find files for improving directory retrieval. To do this,which directory of the followings should be set up?_____. (2 points)
A) parent directory B) child directory
C) working directory D) home directory
(71) Which of the following commands is not one for communication among users_____. (2 points)
A) mail B) write C) telnet D) nice
(72) Of the items listed below,which one(s) should be saved into the process control block?_____. (2 Points)
Ⅰ.Process name and process number
Ⅱ.Process running information
Ⅲ.Current opened file information
A) Ⅰ and Ⅱ B) Ⅰ and Ⅲ C) Ⅱ and Ⅲ D) Ⅰ,Ⅱ and Ⅲ
(73) The DOS command which reads and changes properties of a file is_____.
A) ATTRIB B) COMP C) SYS D) XCOPY
(74) In the following statements about functional dependency, which one is incorrect?_____. (2 Points)
A) If X→Y and Y→Z, then X→Z.
B) If X→Y and Y'ìY, then X