单项选择题
A technician suspects the AC voltage into a PC power supply is bad. Which of the following toolswould MOST likely be used to confirm the diagnosis?（）
A. Multimeter B. Oscilloscope C. Cable tester D. Power supply tester
单项选择题 A home user wants to setup a wireless network. Which of the following would be the MOST important consideration?（）
单项选择题 Which of the following does an out-of-memory error indicate on a printer?（）
单项选择题 Which of the following should the technician do FIRST when removing a paper jam?（）
