单项选择题
A. Jumper settings are incorrect
B. The RAM module is defective
C. The memory slot is defective
D. CMOS needs to be flashed
单项选择题 Which of the following technologies is the MOST secure form of wireless encryption?（）
单项选择题 A technician arrives in Germany and discovers that when their PC is plugged into the outlet, nopower is received. Which of the following actions should the technician take to get the PC tooperate?（）
单项选择题 The contrast ratio for an LCD monitor is BEST defined as the ratio between:（）