单项选择题 A user states that the wireless on their laptop was working when they where at home, however,now in the office no wireless connection can be made. Which of the following should the technician check FIRST?（）

单项选择题 Which of the following commands should Karen, a technician, use to examine and restoreprotected system files?（）

单项选择题 A color laser printer is producing pages where the ink smears when touched. Which of thefollowing components should be replaced?（）