单项选择题 After a technician replaces a laptop display, the technician now notices that the wireless no longer works. Which of the following would be the MOST likely cause？（）

单项选择题 A user has a new laptop with a quad-core processor, and wants to increase the memory of theunit. Which of the following memory types would be the BEST choice?（）

单项选择题 When computers are connected on a network in a manner where the data flows to a central pointand then back out describes which of the following networks?（）