单项选择题
A. Install a USB serial adapter
B. Connect to a USB hub
C. Use an external modem
D. Use an Ethernet card
单项选择题 A technician does not have power to a PC. Which of the following tools should the technician use to check for electricity?（）
单项选择题 Which of the following tools can be used to test if a 24-pin power cable is outputting correct voltage?（）
单项选择题 A laptop LCD screen needs to be replaced. Which of the following tools would be BEST used toopen the case?（）