这两题出自中兴103年资管所计概考题，不知道是自己基本功差还是题目含糊
总有些不确定...
a privileged instruction may be executed only while the hardware is
in kernel mode. Which of the following statments is LEAST likely to
be a privileged instruction?
(A) An instruction that sends output to a printer
(B) An instruction that modifies a memory management register
(C) An instruction that halts the CPU
(D) An instruction that resets the computer's time-of-day clock
(E) An instruction that reads the computer's time-of-day clock
据我所知privileged instruction是指那些容易造成系统危险的指令，
因此要在kernel mode执行，通常对硬件进行操作的指令都是特权指令
这题我是猜E，不知道判断有无错误