以下哪些功能组合足以将操作系统描述为多程序操作系统?
(a) More than one program may be loaded into main memory
at the same time for execution.
(b) If a program waits for certain events such as I/O,
another program is immediately scheduled for execution.
(c) If the execution of program terminates, another program
is immediately scheduled for execution. (一)
(B) a 和 b
(C) a 和 c
(D) a、b 和 c答案：(乙)
解释：
(a) More than one program may be loaded into main memory
at the same time for execution.
True: Only done in a multiprogrammed OS, not in single
programmed OS
(b) If a program waits for certain events such as I/O,
another program is immediately scheduled for execution.
True: Only done in a multiprogrammed OS, not in single
programmed OS
(c) If the execution of program terminates, another program
is immediately scheduled for execution.
False: Done in both Multiprogrammed and single
programmed OSs这个问题的测验