单项选择题 A user reports that their computer suddenly will not boot. When the technician arrives, they discover that the user is very worried they will not be able to complete a research paper theyve been working on which is due by the end of the day. Which of the following is an appropriate response to the users concerns? （）

单项选择题 Which of the following printers would be the BEST choice for printing on multi-part forms?（）

单项选择题 A technician needs to assign a default subnet mask for a class B network to a network device that was just installed. Which of the following would the technician use?（）