单项选择题 A customer states their computer was fine until yesterday when they heard a pop noise and thecomputer stopped working. Which of the following components should the technician test FIRST（）

单项选择题 Which of the following tools is an advanced option of the Windows XP backup tool（）.

单项选择题 A technician dropped a screw in the case of a desktop computer. Which of the following toolsshould be used to retrieve the screws?（）