单项选择题 An end user reports that their computer is not performing as fast as it used to and it shuts down unexpectedly. Which of the following is the MOST likely cause?（）

单项选择题 After hardware upgrades have been installed, the technician boots the computer system. Nodisplay output is observed but a beeping is heard from the computer. Which of the following is the MOST likely issue?（）

单项选择题 A technician needs to upgrade the memory in a laptop. Which of the following memory typeswould be the correct type?（）