单项选择题 Which of the following is a reason why Bob, a technician, should install case fans in the front of acomputer case?（）

单项选择题 When Bob, a technician, powers up a desktop PC, the unit will repeat three short beeps and will not POST. Which of the following is MOST likely the problem?（）

单项选择题 Which of the following is the default location for user account files in Windows Vista?（）